A laser 3D printing system

Abstract

The present invention discloses a laser 3D printing system, including a frame, a liquid storage tank, a mounting frame, a laser light source, a galvanometer, a protective mechanism, a scraper and a stage; the mounting frame is arranged on the frame, the laser light source and the galvanometer are both mounted on the mounting frame, and the galvanometer is used to reflect the laser light emitted by the laser light source into the liquid storage tank; the protective mechanism includes a rotating shaft and a protective cover; the rotating shaft can be rotatably mounted in the liquid storage tank, the protective cover is mounted on the rotating shaft, the opening of the protective cover faces downward, and the upper part of the protective cover is transparent; the scraper is arranged in the protective cover; the stage can be mounted in the liquid storage tank so as to move up and down. The present invention has a simple structure and is easy to use. The problem of oxygen inhibition is not easy to occur during the printing process, and the effect of photocuring molding is improved.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing, and in particular to a laser 3D printing system. Background Art

[0002] Ordinary printers used in daily life can print flat objects designed by computers, while the so-called 3D printers have basically the same working principle as ordinary printers, except that the printing materials are somewhat different. Ordinary printers use ink and paper as printing materials, while 3D printers are filled with real raw materials. After the printer is connected to the computer, the "printing materials" can be stacked layer by layer through computer control, and finally the blueprint on the computer can be turned into a physical object. In 3D printing, photocuring is to focus a laser of a specific wavelength and intensity on the surface of the photocurable material, so that it solidifies from point to line, from line to surface in sequence, completing a level of drawing work, and then the lifting platform moves a layer height in the vertical direction, and then solidifies another layer, so that the layers are stacked to form a three-dimensional entity.

[0003] There are two main methods of photocuring: "top-down" and "bottom-up". Printers with a wavelength of around 405nm use "bottom-up" 3D manufacturing technology, but the structure has a large shrinkage rate and is easy to deform, and the printing area cannot be expanded. "Top-down" printing will easily produce oxygen inhibition due to free radical initiation. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes a laser 3D printing system, which effectively improves the effect of photocuring.

[0005] A laser 3D printing system proposed in the present invention comprises a frame, a liquid storage tank, a mounting frame, a laser light source, a galvanometer, a protection mechanism, a scraper and a stage;

[0006] The mounting frame is arranged on the frame, the laser light source and the galvanometer are both mounted on the mounting frame, and the galvanometer is used to reflect the laser light emitted by the laser light source into the liquid storage tank;

[0007] The protection mechanism comprises a rotating shaft and a protective cover; the rotating shaft can be rotatably installed in the liquid storage tank, the protective cover is installed on the rotating shaft, the opening of the protective cover faces downward, and the upper part of the protective cover is transparent;

[0008] The scraper is arranged in the protective cover;

[0009] The loading platform is installed in the liquid storage tank so as to be movable up and down.

[0010] Preferably, a height measuring device is installed in the protective cover, and the height measuring device is used to detect the height of the liquid level therebelow.

[0011] Preferably, the protective cover is cylindrical.

[0012] Preferably, there are multiple loading platforms, which are evenly distributed along the circumference of the rotation axis;

[0013] The mounting frame can be movably mounted on the frame so that the galvanometer reflects the laser light emitted by the laser light source to any stage.

[0014] Preferably, the upper end surface of the stage is a plane, and the lower end surface of the stage is an arc-shaped surface protruding downward.

[0015] Preferably, it also includes a guide mechanism, which includes a support rod and a guide plate. The support rod is installed in the liquid storage tank, and the guide plate is installed on the support rod. The guide plate is horizontally arranged and surrounds the periphery of the loading platform.

[0016] Preferably, the protective cover is provided with an air inlet hole for gas injection.

[0017] Preferably, a knife holder is movably installed in the protective cover, the moving direction of the knife holder is horizontal, and the scraper knife is movably installed on the knife holder up and down.

[0018] The invention has a simple structure and is easy to use. It is not easy to have oxygen inhibition problems during printing, and the effect of photocuring molding is improved. When the invention is used, printing liquid is injected into the liquid storage tank, so that the protective cover covers the printing liquid, and protective gas is injected into the protective cover. The upper part of the protective cover is transparent, which is convenient for laser to pass through the protective cover. The laser reflected by the galvanometer passes through the protective cover and irradiates the stage to form a layer of structure. Every time a layer is formed, the scraper performs a leveling treatment on the upper end of the solidified layer, and then the stage carries the object in the structure to descend one layer and dive below the liquid surface of the printing liquid, and then prints the next layer until the printing is completed. The scraper is arranged in the protective cover, which is conducive to the scraper completing the leveling work, and is not easy to cause large fluctuations in the printing liquid. The protective cover is driven to move by the rotation of the rotating shaft, so that the printed object on the stage can be conveniently taken out. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a laser 3D printing system proposed in the present invention. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the embodiments. The same components are denoted by the same reference numerals, and it should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] Reference Figure 1As shown, a laser 3D printing system proposed by the present invention includes a frame 1, a liquid storage tank 2, a mounting frame 3, a laser light source 4, a galvanometer 5, a protection mechanism, a scraper 7 and a stage 8;

[0022] The mounting frame 3 is arranged on the frame 1, the laser light source 4 and the galvanometer 5 are both mounted on the mounting frame 3, and the galvanometer 5 is used to reflect the laser light emitted by the laser light source 4 into the liquid storage tank 2;

[0023] The protection mechanism includes a rotating shaft 61 and a protective cover 62; the rotating shaft 61 is rotatably mounted in the liquid storage tank 2, and the protective cover 62 is mounted on the rotating shaft 61, the opening of the protective cover 62 faces downward, and the upper part of the protective cover 62 is transparent;

[0024] The scraper 7 is arranged in the protective cover 62;

[0025] The stage 8 is installed in the liquid storage tank 2 so as to be movable up and down.

[0026] When the present invention is used, the printing liquid is injected into the liquid storage tank 2, so that the protective cover 62 covers the printing liquid, and the protective gas is injected into the protective cover 62. The upper part of the protective cover 62 is transparent, which is convenient for the laser to pass through the protective cover 62. The laser reflected by the galvanometer 5 passes through the protective cover 62 and irradiates the stage 8 to form a layer of structure. Every time a layer is formed, the scraper 7 performs a leveling treatment on the upper end of the solidified layer, and then the stage 8 carries the object in the structure to descend one layer and dive below the liquid surface of the printing liquid, and then prints the next layer until the printing is completed. The scraper 7 is arranged in the protective cover 62, which is conducive to the scraper 7 completing the leveling work while not easily causing large fluctuations in the printing liquid. The protective cover 62 is driven to move by the rotating shaft 61, so that the printed object on the stage 8 can be easily removed.

[0027] In this embodiment, a height measuring device 621 is installed in the protective cover 62, and the height measuring device 621 is used to detect the liquid level below it. The amount of protective gas injected into the protective cover 62 will affect the liquid level in the protective cover 62. The height measuring device 621 can be used to improve the accuracy of the height adjustment of the stage 8.

[0028] In this embodiment, the protective cover 62 is cylindrical, which helps to reduce the resistance generated when the protective cover 62 moves.

[0029] In this embodiment, a plurality of loading platforms 8 are provided, and the loading platforms 8 are evenly distributed along the circumference of the rotating shaft 61;

[0030] The mounting frame 3 can be movably mounted on the frame 1 so that the galvanometer 5 reflects the laser light emitted by the laser light source 4 onto any one of the stage 8 .

[0031] By providing a plurality of loading platforms 8, the efficiency of 3D printing can be effectively improved.

[0032] In this embodiment, the upper end surface of the stage 8 is a plane, and the lower end surface of the stage 8 is a downwardly protruding arc surface. The upper end surface of the stage 8 is set to be a plane, which can effectively reduce the time wasted in processing the lower part of the object after the object is printed. The lower end surface of the stage 8 is a downwardly protruding arc surface, which is beneficial to reduce the resistance when the stage 8 moves downward.

[0033] In order to reduce the possibility of eddy currents appearing above the stage 8 after the stage 8 moves, the present embodiment further includes a flow guiding mechanism, which includes a support rod 91 and a flow guiding plate 92, the support rod 91 is installed in the liquid storage tank 2, the flow guiding plate 92 is installed on the support rod 91, the flow guiding plate 92 is horizontally arranged and surrounds the periphery of the stage 8, and the flow is guided by the flow guiding plate 92.

[0034] In this embodiment, the protective cover 62 is provided with an air inlet 622 for gas injection, so as to facilitate the injection of protective gas into the protective cover 62 .

[0035] In order to adapt to the different distance differences between the printing liquid in the protective cover 62 and the top of the protective cover 62, in this embodiment, a knife holder 623 is movably installed in the protective cover 62, and the moving direction of the knife holder 623 is horizontal. The scraper 7 is installed on the knife holder 623 so as to be movable up and down.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser 3D printing system, characterized in that: It comprises a frame (1), a liquid storage tank (2), a mounting frame (3), a laser light source (4), a galvanometer (5), a protection mechanism, a scraper (7) and a loading platform (8); The mounting frame (3) is arranged on the frame (1), the laser light source (4) and the galvanometer (5) are both mounted on the mounting frame (3), and the galvanometer (5) is used to reflect the laser light emitted by the laser light source (4) into the liquid storage tank (2); The protection mechanism comprises a rotating shaft (61) and a protective cover (62); the rotating shaft (61) is rotatably mounted in the liquid storage tank (2), the protective cover (62) is mounted on the rotating shaft (61), the opening of the protective cover (62) faces downward, and the upper part of the protective cover (62) is transparent; The scraper (7) is arranged in the protective cover (62); The loading platform (8) is installed in the liquid storage tank (2) so as to be movable up and down; A height measuring device (621) is installed in the protective cover (62), and the height measuring device (621) is used to detect the height of the liquid level below it; A plurality of loading platforms (8) are provided, and the loading platforms (8) are evenly distributed along the circumference of the rotating shaft (61); The mounting frame (3) can be movably mounted on the frame (1) so that the galvanometer (5) reflects the laser light emitted by the laser light source (4) onto any one of the object carriers (8).

2. The laser 3D printing system according to claim 1, characterized in that: The protective cover (62) is cylindrical.

3. The laser 3D printing system according to claim 1, characterized in that: The upper end surface of the loading platform (8) is a plane, and the lower end surface of the loading platform (8) is an arc-shaped surface protruding downward.

4. The laser 3D printing system according to claim 3, characterized in that: The device also includes a flow guide mechanism, which includes a support rod (91) and a flow guide plate (92). The support rod (91) is installed in the liquid storage tank (2), and the flow guide plate (92) is installed on the support rod (91). The flow guide plate (92) is horizontally arranged and surrounds the periphery of the loading platform (8).

5. The laser 3D printing system according to claim 1, characterized in that: The protective cover (62) is provided with an air inlet (622) for injecting gas.

6. The laser 3D printing system according to any one of claims 1 to 5, characterized in that: A knife holder (623) is movably mounted in the protective cover (62), the moving direction of the knife holder (623) is horizontal, and the scraper (7) is movably mounted on the knife holder (623).

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