High-precision dustproof projection lens DLP-3D printer

Abstract

The utility model discloses a high accuracy projection lens dustproof DLP 3D printer, including the bottom plate, the top of bottom plate is provided with the projection lens body, the top of bottom plate is provided with the moving mechanism of providing the projection lens body movement, the below of projection lens body is provided with the insulation mechanism for the projection lens body and outside isolation to reach the dustproof purpose, the surface of bottom plate is provided with the holding mechanism for holding resin, the utility model discloses the physical barrier of the baffle ring in insulation mechanism and optical glass form, prevent resin volatile and dust direct adhesion in projection lens, compared with traditional open type design, significantly reduce the light path pollution risk, ensure UV light even projection, avoid printing model and appear the spot or layered defect. The baffle ring design of screw rod connection is convenient for the quick disassembly replacement of optical glass, and the integrated layout simplifies the equipment maintenance process, reduces the downtime.

Description

Technical Field

[0001] This utility model relates to the field of printer technology, specifically a high-precision dustproof DLP-3D printer with a projection lens. Background Technology

[0002] A DLP-3D printer is an additive manufacturing device based on photopolymerization technology. Its core principle is to project digital images layer by layer onto the surface of liquid photosensitive resin using a projector, and then cure the entire layer in one pass using a single light source. This technology belongs to the photopolymerization 3D printing technology category. Compared with traditional SLA laser dot scanning, it has a faster forming speed, and its resolution depends on the pixel density of the projector.

[0003] In existing DLP-3D printers, dust accumulation on the projection lens surface can cause light scattering or refraction, resulting in uneven UV light projection onto the cured resin. This directly causes defects such as spots, blurring, or delamination on the surface of the printed model. It can also interfere with the light path, affecting pixel-level accurate exposure and potentially leading to model size deviations or loss of detail, especially noticeable in micron-level high-precision printing. Therefore, we need to propose a high-precision dust-proof DLP-3D printer with a high-projection lens. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision dustproof DLP-3D printer with a projection lens, which has the advantage of dustproof projection lens, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision dustproof DLP-3D printer with a projection lens, comprising a base plate, a projection lens body disposed above the base plate, a moving mechanism for moving the projection lens body disposed above the base plate, an isolation mechanism for isolating the projection lens body from the outside environment to achieve dustproof purpose disposed below the projection lens body, a holding mechanism for holding resin disposed on the surface of the base plate, and a cleaning mechanism for cleaning the surface of the isolation mechanism disposed on one side of the holding mechanism.

[0006] Preferably, the moving mechanism includes a first bracket, which is disposed on the top of the base plate. A first electric guide rail is disposed on one side of the first bracket. A second bracket is disposed at the output end of the first electric guide rail. A second electric guide rail is disposed on one side of the second bracket. The output end of the second electric guide rail is connected to the projection lens body.

[0007] Preferably, the isolation mechanism includes a retaining ring disposed below the projection lens body, the inner wall of the retaining ring being provided with optical glass, and the bottom of the retaining ring being provided with a screw that passes through the retaining ring and extends into the interior of the projection lens body.

[0008] Preferably, the holding mechanism includes a third electric guide rail, which is disposed on the top of the base plate, and a holding box is provided at the output end of the third electric guide rail.

[0009] Preferably, the cleaning mechanism includes a cleaning box, which is disposed on one side of the holding box. A servo motor is disposed at the bottom of the cleaning box, and a pulley assembly is disposed at the output end of the servo motor. A soft brush is disposed at the top of the drive shaft of the pulley assembly, and a wool block is disposed at the top of the drive shaft of the pulley assembly. A liquid spraying mechanism is disposed on one side of the cleaning box.

[0010] Preferably, the spraying mechanism includes a liquid storage box, which is disposed on one side of the cleaning box. A spraying pipe is disposed on the top of the cleaning box and located above the soft brush. One end of the spraying pipe passes through the liquid storage box and is equipped with a water pump.

[0011] Preferably, a controller is provided on the surface of the base plate, and the controller is electrically connected to the first electric guide rail, the second electric guide rail, the projection lens body, the third electric guide rail, the servo motor and the water pump.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model forms a physical barrier between the retaining ring in the isolation mechanism and the optical glass, preventing resin volatiles and dust from directly adhering to the projection lens. Compared with traditional open designs, this significantly reduces the risk of light path contamination, ensures uniform UV light projection, and avoids spot or delamination defects in the printed model. The screw-connected retaining ring design facilitates quick disassembly and replacement of the optical glass, while the integrated layout simplifies equipment maintenance procedures and reduces downtime.

[0013] 2. This utility model can periodically and automatically clean the surface of optical glass through the soft brush, wool block and spray pipe in the cleaning mechanism. Combined with the pulley group driven by the servo motor, it can achieve efficient and scratch-free cleaning, which solves the problems of low efficiency and easy damage to the lens of traditional manual cleaning. It is especially suitable for high-precision micron-level printing scenarios. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the pulley assembly of this utility model; Figure 3 This is a cross-sectional view of the servo motor of this utility model; Figure 4 This is a cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the structure of the first electric guide rail of this utility model; Figure 6This utility model Figure 5 Enlarged view of point A.

[0015] In the diagram: 1. Base plate; 2. Projection lens body; 3. First bracket; 4. First electric guide rail; 5. Second bracket; 6. Second electric guide rail; 7. Retaining ring; 8. Optical glass; 9. Screw; 10. Third electric guide rail; 11. Container box; 12. Cleaning box; 13. Servo motor; 14. Pulley assembly; 15. Soft brush; 16. Wool block; 17. Liquid storage box; 18. Spray pipe; 19. Water pump. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-5 This utility model provides a technical solution: a high-precision dustproof DLP-3D printer with a projection lens, including a base plate 1, a projection lens body 2 disposed on top of the base plate 1, and a moving mechanism for moving the projection lens body 2 disposed on top of the base plate 1; the moving mechanism includes a first bracket 3 disposed on the top of the base plate 1, a first electric guide rail 4 disposed on one side of the first bracket 3, a second bracket 5 disposed at the output end of the first electric guide rail 4, and a second electric guide rail 6 disposed on one side of the second bracket 5, the output end of the second electric guide rail 6 being connected to the projection lens body 2. After the controller is activated, the first electric guide rail 4 and the second electric guide rail 6 are driven first to move the projection lens body 2 to the initial position, usually the edge of the printing area. The third electric guide rail 10 is simultaneously activated, delivering the resin container 11 to directly below the projection lens, ready for printing.

[0018] A dustproof isolation mechanism is provided below the projection lens body 2 to isolate it from the outside environment. This mechanism includes a retaining ring 7, located below the projection lens body 2. An optical glass 8 is installed on the inner wall of the retaining ring 7, and a screw 9 is located at the bottom of the retaining ring 7, extending through it and into the interior of the projection lens body 2. A mechanical seal structure is used; the projection lens body 2 presses down on the optical glass 8 through the adjustable retaining ring 7, forming a rigid contact seal with the surface of the container 11. This dynamic pressing structure ensures uniform pressure on the contact surface through the threaded fine-tuning function of the screw 9, guaranteeing both sealing and preventing glass breakage. The sealed space can block a significant amount of volatile organic compounds from the resin (such as acrylate monomers).

[0019] Optical transmission medium; Optical glass 8 is made of ultraviolet-grade quartz glass (transmittance > 92% @ 405nm), whose refractive index (nd = 1.46) forms an optimized interface with air (n = 1.0), so that Fresnel reflection loss when UV light passes through is < 4%. Compared with the direct air-resin projection of open lenses, this design controls the light scattering angle within ±1° (traditional designs are usually > ±5°).

[0020] The system works in tandem; after the third electric guide rail 10 drives the container 11 into position, the moving mechanism precisely positions the lens via the first electric guide rail 4 and the second electric guide rail 6, maintaining a constant gap of 0.1-0.3mm between the optical glass 8 and the resin liquid surface. This "hard seal + micro-gap" design prevents resin contamination and avoids light energy attenuation.

[0021] To prevent resin volatiles and dust from directly adhering to the projection lens, this design significantly reduces the risk of light path contamination compared to traditional open designs, ensuring uniform UV light projection and preventing spotting or delamination defects in the printed model. The screw-connected retaining ring design facilitates quick disassembly and replacement of the optical glass, while the integrated layout simplifies equipment maintenance and reduces downtime.

[0022] The surface of the base plate 1 is provided with a holding mechanism for holding resin; the holding mechanism includes a third electric guide rail 10, which is disposed on the top of the base plate 1, and a holding box 11 is provided at the output end of the third electric guide rail 10. The holding box 11 is used to hold resin.

[0023] A cleaning mechanism for cleaning the surface of the isolation mechanism is provided on one side of the holding mechanism; the cleaning mechanism includes a cleaning box 12, which is located on one side of the holding box 11. A servo motor 13 is provided at the bottom of the cleaning box 12. A pulley group 14 is provided at the output end of the servo motor 13. A soft brush 15 is provided at the top of the drive shaft of the pulley group 14. A wool block 16 is provided at the top of the drive shaft of the pulley group 14. A liquid spraying mechanism is provided on one side of the cleaning box 12.

[0024] The spraying mechanism includes a liquid storage box 17, which is located on one side of the cleaning box 12. A spray pipe 18 is positioned on top of the cleaning box 12, above the soft brush 15. One end of the spray pipe 18 passes through the liquid storage box 17 and is equipped with a water pump 19. During printing intervals, the servo motor 13 of the cleaning mechanism drives the pulley assembly 14, causing the soft brush 15 and wool block 16 to rotate, cleaning the surface of the optical glass 8. Simultaneously, the spray pipe 18 sprays cleaning fluid such as isopropyl alcohol to assist in decontamination. This solves the problems of low efficiency and easy lens damage associated with traditional manual cleaning, making it particularly suitable for high-precision micron-level printing scenarios.

[0025] A controller is mounted on the surface of the base plate 1. The controller is electrically connected to the first electric guide rail 4, the second electric guide rail 6, the projection lens body 2, the third electric guide rail 10, the servo motor 13, and the water pump 19. The controller can be a Siemens S7-1200 series.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision projection lens dustproof DLP-3D printer, comprising a base plate (1), characterized in that: A projection lens body (2) is provided above the base plate (1). A moving mechanism for moving the projection lens body (2) is provided above the base plate (1). An isolation mechanism for isolating the projection lens body (2) from the outside world to achieve dust prevention is provided below the projection lens body (2). A holding mechanism for holding resin is provided on the surface of the base plate (1). A cleaning mechanism for cleaning the surface of the isolation mechanism is provided on one side of the holding mechanism.

2. The high-precision projection lens dustproof DLP-3D printer according to claim 1, characterized in that: The moving mechanism includes a first bracket (3), which is set on the top of the base plate (1). A first electric guide rail (4) is provided on one side of the first bracket (3). A second bracket (5) is provided at the output end of the first electric guide rail (4). A second electric guide rail (6) is provided on one side of the second bracket (5). The output end of the second electric guide rail (6) is connected to the projection lens body (2).

3. A high-precision projection lens dustproof DLP-3D printer according to claim 2, characterized in that: The isolation mechanism includes a retaining ring (7), which is located below the projection lens body (2). The inner wall of the retaining ring (7) is provided with optical glass (8), and the bottom of the retaining ring (7) is provided with a screw (9). The screw (9) passes through the retaining ring (7) and extends into the interior of the projection lens body (2).

4. A high-precision projection lens dustproof DLP-3D printer according to claim 3, characterized in that: The holding mechanism includes a third electric guide rail (10), which is set on the top of the base plate (1), and the output end of the third electric guide rail (10) is provided with a holding box (11).

5. A high-precision projection lens dustproof DLP-3D printer according to claim 4, characterized in that: The cleaning mechanism includes a cleaning box (12), which is located on one side of the holding box (11). A servo motor (13) is located at the bottom of the cleaning box (12). A pulley assembly (14) is located at the output end of the servo motor (13). A soft brush (15) is located at the top of the drive shaft of the pulley assembly (14). A wool block (16) is located at the top of the drive shaft of the pulley assembly (14). A liquid spraying mechanism is located on one side of the cleaning box (12).

6. A high-precision projection lens dustproof DLP-3D printer according to claim 5, characterized in that: The spraying mechanism includes a liquid storage box (17), which is located on one side of the cleaning box (12). The top of the cleaning box (12) is provided with a spray pipe (18) and located above the soft brush (15). One end of the spray pipe (18) passes through the liquid storage box (17) and is provided with a water pump (19).

7. A high-precision projection lens dustproof DLP-3D printer according to claim 6, characterized in that: The base plate (1) is provided with a controller, which is electrically connected to the first electric guide rail (4), the second electric guide rail (6), the projection lens body (2), the third electric guide rail (10), the servo motor (13) and the water pump (19).

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