A base structure for an LCD photopolymer 3D printer

Abstract

This utility model relates to the field of 3D printers, specifically to a base structure for an LCD photopolymerization 3D printer. It includes a material tank, which is a through-frame structure with a pressing frame fixedly connected to its lower surface. The pressing frame presses and fixes a release film to the bottom surface of the material tank. A base, which is a through-platform structure, has a mounting platform on its top surface for mounting an LCD screen. An annular groove A surrounds the mounting platform on the base, the size of which matches the lower structure of the pressing frame. A through-hole is provided on the mounting platform for the LCD screen's ribbon cable to pass through. When the material tank is installed on the base, the release film adheres to the LCD screen and covers the mounting platform. The release film is an oxygen-permeable membrane. This utility model allows oxygen to pass through the breathable release film because of the resin's oxygen-inhibiting properties, preventing a single ultra-thin layer of liquid resin from curing.

Description

Technical Field

[0001] This utility model relates to the field of 3D printers, specifically to a base structure for an LCD photopolymer 3D printer. Background Technology

[0002] LCD photopolymerization 3D printing technology, also known as mask stereolithography, is an emerging 3D printing technology. LCD photopolymerization technology cures liquid resin through a light source. Its unique feature is that the light source is controlled by an LCD screen. This technology utilizes the imaging principle of the LCD screen. The computer program provides image signals, which selectively create transparent areas on the LCD screen. Under the illumination of an ultraviolet light source, the ultraviolet light passing through the LCD screen forms an ultraviolet light image area. The liquid resin that is irradiated becomes solid, while the opaque parts of the LCD screen cannot be photopolymerized. The entire process is carried out layer by layer on a preset 3D model. By stacking and curing resin layers, a complete 3D printed object is finally constructed.

[0003] Current LCD photopolymerization bases typically use a release film installed at the bottom of the material tank to hold the liquid resin. During 3D printing, the resin will adhere to the release film as it cures. The more times it is used, the greater the adhesion becomes, which affects the printing effect. Summary of the Invention

[0004] This invention relates to a base structure for an LCD photopolymerization 3D printer. It utilizes oxygen to pass through a breathable release film. Due to the properties of the resin, namely its oxygen inhibition effect (the resin does not undergo a curing reaction when exposed to UV light after contact with oxygen and remains in a liquid state), an ultra-thin (10-50µm) layer of uncured liquid resin is formed between the solid and the release film after the liquid resin solidifies, thereby avoiding adhesion problems that could affect the printing effect.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A base structure for an LCD photopolymer 3D printer, comprising,

[0007] The material trough is configured as a through frame, and a pressing frame is fixedly connected to its lower surface. The pressing frame presses and fixes the release film to the bottom surface of the material trough.

[0008] The base extends through the platform structure, and its top surface is provided with a mounting platform for mounting an LCD screen. An annular groove A surrounds the mounting platform, and the dimensions of the annular groove A match the lower structure of the film-pressing frame. A through-hole is provided on the mounting platform for the LCD screen's ribbon cable to pass through.

[0009] When the material tank is installed on the base, the release film adheres to the LCD screen and covers the mounting platform.

[0010] The release film is an oxygen-permeable membrane, and at least two ventilation holes are provided opposite to each other on the side wall of the mounting platform, the ventilation holes penetrating both ends of the mounting platform.

[0011] Furthermore, a light-transmitting frosted film is adhered to the LCD screen, with the frosted surface of the light-transmitting frosted film facing and adhered to the release film.

[0012] Furthermore, the upper surface of the pressing frame is provided with a mounting groove A that matches the size of the lower end face of the material trough. An annular groove B is provided on the bottom surface of the mounting groove A, and a sealing strip is provided in the annular groove B to enhance the pressing and sealing performance of the release film.

[0013] Furthermore, the vent holes are symmetrically arranged in the strip grooves on the left and right sides of the mounting platform.

[0014] Furthermore, the mounting platform is provided with a mounting slot whose size matches that of the LCD screen.

[0015] Furthermore, the mounting platform is equipped with clips for pressing the LCD screen.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This patent uses an oxygen-permeable release film and provides ventilation holes on the LCD screen mounting platform for pressurized oxygen flow. This allows oxygen to pass through between the LCD screen and the release film, resulting in an ultra-thin layer of uncured liquid resin between the solid and the release film after the liquid resin solidifies. This avoids adhesion problems that could affect the printing effect. In addition, to ensure that oxygen passes through the release film more evenly, a frosted film is also attached to the LCD screen, with the frosted side facing the release film. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the exploded structure of this utility model. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figures 1-2 As shown, a base structure for an LCD photopolymer 3D printer includes,

[0022] The material trough 10 is configured as a through frame, and a pressing frame 101 is fixedly connected to its lower surface. The pressing frame 101 presses and fixes the release film 102 to the bottom surface of the material trough 10.

[0023] The base 20 penetrates the platform structure, and its top surface is provided with a mounting platform 202 for mounting an LCD screen 201. The base 20 has an annular groove A203 surrounding the mounting platform 202, the size of which matches the lower end structure of the pressing frame 101. The mounting platform 202 has a through-hole slot 2021 for the LCD screen 201's ribbon cable to pass through.

[0024] When the material tank 10 is installed on the base 20, the release film 102 adheres to the LCD screen 201 and covers the mounting platform 202.

[0025] The release film 102 is an oxygen-permeable membrane, and at least two ventilation holes 2022 are provided opposite to each other on the side wall of the mounting platform 202, the ventilation holes 2022 penetrating the two end faces of the mounting platform 202.

[0026] Specifically, the material tank 10 and the mold frame 101 are connected by screws, with the bolt holes being countersunk to prevent the screws from protruding and affecting the installation effect. At the same time, the corners of the material tank 10 and the mold frame 101 are rounded. By setting the vent 2022 on the mounting platform 202, it can be ensured that the oxygen supplied through the vent 2022 can enter between the LCD screen and the release film 102, so that the oxygen can pass through from the top of the release film 102, forming an approximately ultra-thin (10-50um) liquid resin non-curing layer on the top of the release film, thereby reducing the occurrence of resin and release film adhesion. At the same time, in order to ensure the breathability, after the cable of the LCD screen 201 passes through the through groove 2021, the through groove 2021 is sealed with sealant. The release film 102 is preferably Pyflon AM260 Film.

[0027] Furthermore, in order to better enable oxygen to permeate the release film evenly, a light-transmitting frosted film 2011 is attached to the LCD screen 201 described in this patent. The frosted surface of the light-transmitting frosted film 2011 faces and is attached to the release film 102. This arrangement allows oxygen entering through the vent 2022 to pass through the release film 102 better and more evenly through the gap between the frosted surface of the light-transmitting frosted film 2011 and the release film 102. The light-transmitting frosted film 2011 can be of model MDJ880.

[0028] Furthermore, countersunk mounting screws are provided at the four corners of the pressing frame 101 to mount the material tank 10 and the pressing frame 101 onto the base 20. To prevent the liquid resin on the material tank 10 from seeping into the base below, the upper surface of the pressing frame 101 is provided with a mounting groove A1011 that matches the size of the lower end face of the material tank 10. An annular groove B1012 is provided on the bottom surface of the mounting groove A1011, and a sealing strip 1013 is provided in the annular groove B1012 to enhance the pressing and sealing performance of the release film 102.

[0029] Furthermore, in order to allow oxygen to enter the release membrane 102 more evenly, the vent holes 2022 are symmetrically arranged in the strip grooves 2023 provided on the left and right sides of the mounting platform 202. This increases the size of the entry surface when oxygen enters the release membrane 102, avoiding direct impact on the release membrane 102.

[0030] Furthermore, in order to better fix the LCD screen 201, the mounting platform 202 is provided with a mounting groove 2024 whose size matches that of the LCD screen 201. The mounting platform 202 is equipped with a clamp 2025 for pressing the LCD screen 201. The clamp 2025 can be fixed in the fixing groove on the mounting platform 202 by screws, and the free end is used to press the upper side of the LCD screen 201. The lower side of the LCD screen 201 can be fixed in the mounting groove 2024 by double-sided adhesive.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A base structure for an LCD photopolymer 3D printer, comprising, Material tank (10), the material tank (10) is arranged in the form of a through frame, and a pressing frame (101) is fixedly connected to its lower surface. The pressing frame (101) presses and fixes the release film (102) to the bottom surface of the material tank (10); The base (20) penetrates the platform structure, and its top surface is provided with a mounting platform (202) for mounting an LCD screen (201). The base (20) is provided with an annular groove A (203) surrounding the mounting platform (202). The size of the annular groove A (203) matches the lower end structure of the film pressing frame (101). The mounting platform (202) is provided with a through-hole groove (2021) for the ribbon cable of the LCD screen (201) to pass through. in, When the material tank (10) is installed on the base (20), the release film (102) adheres to the LCD screen (201) and covers the mounting platform (202), characterized in that, The release film (102) is an oxygen-permeable membrane, and at least two ventilation holes (2022) are provided opposite to each other on the side wall of the mounting platform (202), and the ventilation holes (2022) penetrate through both ends of the mounting platform (202).

2. The base structure of an LCD photopolymer 3D printer according to claim 1, characterized in that, A light-transmitting frosted film (2011) is attached to the LCD screen (201), with the frosted surface of the light-transmitting frosted film (2011) facing and attached to the release film (102).

3. The base structure of an LCD photopolymer 3D printer according to claim 1, characterized in that, The upper surface of the pressing frame (101) is provided with an installation groove A (1011) that matches the size of the lower end face of the material groove (10). An annular groove B (1012) is provided on the bottom surface of the installation groove A (1011). A sealing strip (1013) is provided in the annular groove B (1012) to enhance the pressing and sealing performance of the release film (102).

4. The base structure of an LCD photopolymer 3D printer according to claim 1, characterized in that, The ventilation holes (2022) are symmetrically arranged in the strip grooves (2023) on the left and right sides of the mounting platform (202).

5. The base structure of an LCD photopolymer 3D printer according to claim 1, characterized in that, The mounting platform (202) is provided with a mounting slot (2024) whose size matches that of the LCD screen (201).

6. The base structure of an LCD photopolymer 3D printer according to claim 5, characterized in that, The mounting platform (202) is equipped with a clamp (2025) for pressing the LCD screen (201).

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