Film tensioning assembly and photo-curing 3D printing device

Abstract

Disclosed in the present application are a film tensioning assembly and a photo-curing 3D printing device. The film tensioning assembly comprises: a release film, which is used for fixing a liquid surface of a liquid photosensitive resin to a focal plane of a photo-curing 3D printing device, the focal plane being located in a first direction of the release film; a rigid transparent plate, which is attached to the surface of the release film in a second direction and is used for blocking the release film from deforming in the second direction, the first direction being opposite to the second direction; and a film fixing part, wherein the release film and the rigid transparent plate are fixed by means of the film fixing part. In this way, the leveling time for the liquid surface of the photosensitive resin on the release film can be shortened, thereby improving the efficiency of 3D printing.

Description

Film stretching assembly and light-curing 3D printing device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on January 17, 2024, with application number 202420116503.4 and application name “Film stretching assembly and light-curing 3D printing device”, parts of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of 3D printing technology, and in particular to a film stretching assembly and a light-curing 3D printing device. Background Art

[0003] With its high precision, high efficiency, and versatility, photocuring 3D printing technology has become an important tool in product design and manufacturing. Its working principle is as follows: The photocuring 3D printing device contains a resin tank with an ultraviolet light source above it. During printing, the release film fixes the liquid level of the photosensitive resin in the resin tank at the focal plane. Then, under the irradiation of ultraviolet light, the photosensitive resin undergoes chemical cross-linking, thereby solidifying into a solid object. The platform then descends, and the liquid resin is replenished and exposed again. By repeating this process, the entire 3D printing process is finally completed. However, the current release film is relatively soft and easily affected by factors such as the liquid level, platform area, and cross-sectional area of ​​the cured area. The release film is prone to deformation, which increases the time it takes for the liquid level of the photosensitive resin on the release film to level, affecting the efficiency of 3D printing.

[0004] Application Contents

[0005] Based on this, the embodiments of the present application provide a film stretching assembly and a light-curing 3D printing device, which can shorten the time it takes for the liquid surface of the photosensitive resin on the release film to level, thereby improving the efficiency of 3D printing.

[0006] In a first aspect, an embodiment of the present application provides a film stretching assembly, which is applied to a light-curing 3D printing device. The film stretching assembly includes:

[0007] A release film, used to fix the liquid surface of the liquid photosensitive resin on the focal plane of the light-curing 3D printing device, wherein the focal plane is located in a first direction of the release film;

[0008] a rigid transparent light plate, attached to a surface of the release film in a second direction, for preventing the release film from deforming in the second direction, the first direction being opposite to the second direction;

[0009] Film fixing parts, the release film and the rigid transparent light plate are fixed by the film fixing parts.

[0010] In a second aspect, an embodiment of the present application further provides a light-curing 3D printing device, which includes the film stretching assembly as described in the first aspect.

[0011] In an embodiment of the present application, the focal plane of the light-curing 3D printing device is located in the first direction of the release film, and the film stretching assembly is provided with a rigid transparent light plate, which is bonded to the surface of the release film in the second direction. In this way, during the process of printing an object by the light-curing 3D printing device, the rigid transparent light plate can prevent the release film from deforming in the second direction, and the release film can only deform in the first direction, thereby being able to produce a release effect with the printed object. Therefore, compared with the related art, the embodiment of the present application can effectively shorten the time for the liquid surface of the photosensitive resin on the release film to level while ensuring the release effect of the release film, thereby improving the efficiency of 3D printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic structural diagram of an embodiment of a film stretching assembly of the present application;

[0013] FIG2 is a schematic structural diagram of another embodiment of the film stretching assembly of the present application;

[0014] FIG3 is a structural diagram of another embodiment of the film stretching assembly of the present application;

[0015] FIG4 is a schematic structural diagram of another embodiment of the film stretching assembly of the present application;

[0016] FIG5 is a structural diagram of another embodiment of the stretch film assembly of the present application;

[0017] FIG6 is a schematic structural diagram of another embodiment of the film stretching assembly of the present application;

[0018] FIG7 is a structural diagram of another embodiment of the stretch film assembly of the present application;

[0019] FIG8 is a schematic structural diagram of an embodiment of a light-curing 3D printing device of the present application.

[0020] Explanation of main components and symbols: 100, film stretching assembly; 110, rigid transparent light plate; 111, air vent; 101, film fixing part; 120, first film fixing part; 121, first groove; 130, second film fixing part; 131, second groove; 132, first protrusion; 140, third film fixing part; 141, plate groove; 142, second protrusion; 10, resin tank; 20, resin tank moving mechanism; 30, light source and projection assembly; 31, light outlet; 40, printing platform; 50, platform moving mechanism. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined, or partially merged, so the actual execution order may vary depending on the actual situation.

[0023] With its high precision, high efficiency, and versatility, photocuring 3D printing technology has become an important tool in product design and manufacturing. Its working principle is as follows: The photocuring 3D printing device contains a resin tank with an ultraviolet light source above it. During printing, the release film fixes the liquid level of the photosensitive resin in the resin tank at the focal plane. Then, under the irradiation of ultraviolet light, the photosensitive resin undergoes chemical cross-linking, thereby solidifying into a solid object. The platform then descends, and the liquid resin is replenished and exposed again. By repeating this process, the entire 3D printing process is finally completed. However, the current release film is relatively soft and easily affected by factors such as the liquid level, platform area, and cross-sectional area of ​​the cured area. The release film is prone to deformation, which increases the time it takes for the liquid level of the photosensitive resin on the release film to level, affecting the efficiency of 3D printing.

[0024] In an embodiment of the present application, the focal plane of the light-curing 3D printing device is located in the first direction of the release film, and the film stretching assembly is provided with a rigid transparent light plate, which is bonded to the surface of the release film in the second direction. In this way, during the process of printing an object by the light-curing 3D printing device, the rigid transparent light plate can prevent the release film from deforming in the second direction, and the release film can only deform in the first direction, thereby being able to produce a release effect with the printed object. Therefore, compared with the related art, the embodiment of the present application can effectively shorten the time for the liquid surface of the photosensitive resin on the release film to level while ensuring the release effect of the release film, thereby improving the efficiency of 3D printing.

[0025] It should be noted that the photosensitive resin in the embodiments of the present application refers to all materials that can be used for photocuring 3D printing, such as photosensitive resin, photosensitive resin-doped ceramic slurry, and photosensitive resin-doped metal slurry.

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] Referring to Figures 1 and 2, Figures 1 and 2 are schematic structural diagrams of two embodiments of the film stretching assembly of the present application. The film stretching assembly 100 includes: a release film (not shown), a rigid transparent light plate 110, and a film fixing part 101. The release film is used to fix the liquid surface of the liquid photosensitive resin on the focal plane of the light-curing 3D printing device. During the process of printing an object by the light-curing 3D printing device, the focal plane of the light-curing 3D printing device is located in the first direction of the release film; the rigid transparent light plate 110 is attached to the surface of the release film in the second direction and is used to prevent the release film from deforming in the second direction, and the first direction is opposite to the second direction; the release film and the rigid transparent light plate 110 are fixed by the film fixing part 101. Among them, the first direction of the release film is the bottom of the release film, and the second direction of the release film is the top of the release film, or the first direction of the release film is the top of the release film, and the second direction of the release film is the bottom of the release film.

[0028] The stretch film assembly 100 in the embodiment of the present application is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is bonded to the surface of the release film in the second direction. In this way, during the process of printing an object by the light-curing 3D printing device, the rigid transparent light plate can prevent the release film from deforming in the second direction, and the release film can only deform in the first direction, thereby being able to produce a release effect with the printed object. Therefore, the stretch film assembly 100 provided in the embodiment of the present application can use the release film to quickly flatten the liquid surface of the photosensitive resin to be printed and prevent the deformation of the release film, thereby significantly shortening the time for the liquid surface of the photosensitive resin to level, thereby improving the efficiency of 3D printing.

[0029] In the related art, the method for printing release film is to fill the resin tank with photosensitive resin, cover the release film on top of the photosensitive resin, and pass the light source through the release film to solidify the photosensitive resin on the lower surface of the release film. After that, the printing platform descends, and the solidified photosensitive resin separates from the release film. After waiting for a new layer of photosensitive resin to be added to the lower surface of the release film, the printing platform rises a certain distance, and then the release film is made flat by self-leveling. However, the current release film is relatively soft and easily affected by the liquid level height, platform area, cross-sectional area of ​​the solidified area, etc. The release film is prone to deformation, which will lead to the following four technical problems: (1) The time it takes for the liquid surface of the photosensitive resin on the release film to level increases, affecting the efficiency of 3D printing; (2) When the structure of the printed model changes in horizontal cross-sectional area, the release film will be deformed. (1) When the viscosity of the photosensitive resin is very large, the degree of bulge of the release film is different, resulting in uncontrollable thickness of the liquid layer and poor printing effect; (2) When the viscosity of the photosensitive resin itself is very high, or when the viscosity is very high due to the doping of particles in the middle of the photosensitive resin, the release film will be deformed when it is soaked in the photosensitive resin. When the viscosity of the photosensitive resin is very high, the deformed release film cannot naturally return to a flat state through its own tension; (3) When the liquid level of the photosensitive resin is too high, the middle area of ​​the release film will bulge upward, while when the liquid level of the photosensitive resin is too low, the middle area of ​​the release film will be concave downward.

[0030] In response to the above-mentioned technical problem (1), the stretch film assembly 100 in the embodiment of the present application is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is bonded to the upper surface of the release film. In this way, during the process of printing an object by the light-curing 3D printing device, the rigid transparent light plate can prevent the release film from deforming upward, and the release film can only deform downward, thereby being able to produce a release effect with the printed object. Therefore, the stretch film assembly 100 provided in the embodiment of the present application can use the release film to quickly flatten the liquid surface of the photosensitive resin to be printed and prevent the release film from deforming upward, thereby significantly shortening the time for the liquid surface of the photosensitive resin to level, thereby improving the efficiency of 3D printing.

[0031] In response to the above-mentioned technical problem (2), the film stretching assembly 100 in the embodiment of the present application is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is bonded to the upper surface of the release film. In this way, during the process of printing an object by the light-curing 3D printing device, the rigid transparent light plate can prevent the release film from deforming upward, so that the printing platform or the printed model located below the release film will not affect the release film, and the position of the release film always remains constant. In this way, the thickness of the liquid layer can be accurately controlled by relying solely on the movement of the control axis of the printing platform. The layer thickness uniformity of the model is good, thereby improving the printing effect, printing success rate and yield rate of the model.

[0032] In response to the above-mentioned technical problem (3), the film stretching assembly 100 in the embodiment of the present application is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is bonded to the upper surface of the release film. In this way, in the process of infiltrating the film stretching assembly 100 in the photosensitive resin, no matter whether the photosensitive resin used is a low-viscosity photosensitive resin or a high-viscosity photosensitive resin, the rigid transparent light plate can prevent the release film from deforming upward, thereby reducing the leveling problem caused by viscosity. This makes the film stretching assembly 100 in the embodiment of the present application applicable to both high- and low-viscosity photosensitive resins, thereby expanding the scope of application of the film stretching assembly 100.

[0033] In response to the above-mentioned technical problem (4), the film stretching assembly 100 in the embodiment of the present application is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is bonded to the upper surface of the release film, thereby preventing the middle area of ​​the release film from bulging upward due to the high liquid level of the photosensitive resin. In addition, the rigid transparent light plate 110 is bonded to the upper surface of the release film, which can better tighten the release film so that the middle area of ​​the release film will not be concave due to the low liquid level of the photosensitive resin. Therefore, the use of the film stretching assembly 100 in the embodiment of the present application will not be limited by the liquid level of the photosensitive resin.

[0034] Referring to Figures 3 and 4, which are schematic structural diagrams of two other embodiments of the film stretching assembly of the present application, the film fixing part 101 includes a first film fixing part 120, a second film fixing part 130, and a third film fixing part 140. The release film is removably fixed by the first film fixing part 120 and the second film fixing part 130. The third film fixing part 140 is provided with a plate groove 141 that matches the rigid transparent light plate 110 and is used to removably fix the rigid transparent light plate 110. The third film fixing part 140 is used to removably fix to the first film fixing part 120 and the second film fixing part 130. The removable fixation can be achieved by locking.

[0035] The release film and the rigid transparent light plate 110 of the film stretching assembly 100 provided in the embodiment of the present application are both detachable, which facilitates the replacement and updating of the release film and the rigid transparent light plate 110. Since only the release film and / or the rigid transparent light plate 110 of the film stretching assembly 100 need to be replaced while retaining other parts of the film stretching assembly 100, the cost of replacing and updating the film stretching assembly 100 can be further reduced. Since the release film suitable for the photosensitive resin can be replaced according to the different photosensitive resins, the scope of application of the film stretching assembly 100 can also be expanded.

[0036] Referring to Figure 5, in some embodiments, the release film includes a rectangular release film. Referring to Figure 6, in some embodiments, the release film includes a circular release film. Among them, the area of ​​the rectangular release film is relatively large. The circular release film can ensure the area required by the release film on the one hand, and on the other hand, it can more effectively reduce the area of ​​the release film compared to release films of other shapes. The film stretching assembly 100 in the embodiment of the present application is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is attached to the upper surface of the release film. In this way, whether it is a rectangular release film with a large area or a circular release film with a small area, the rigid transparent light plate 110 can prevent it from deforming upward, thereby reducing the leveling problem caused by viscosity. This makes the film stretching assembly 100 in the embodiment of the present application applicable to release films of various shapes, expanding the scope of application of the film stretching assembly 100.

[0037] Referring to Figures 4 and 6 , in some embodiments, the first film-securing component 120 is provided with a first groove 121 for receiving a release film. The second film-securing component 130 is provided with a second groove 131 and a first protrusion 132 that matches the first groove 121. The release film is removably secured by the first groove 121 of the first film-securing component 120 and the first protrusion 132 of the second film-securing component 130. The third film-securing component 140 is provided with a second protrusion 142 that matches the second groove 131 and is removably secured to the first and second film-securing components 120 and 130. In some embodiments, the plate groove 141 is provided at the edge of the second protrusion 142.

[0038] In the film stretching assembly 100 provided in the embodiment of the present application, since the release film is fixed together by the first film fixing part 120 and the second film fixing part 130, the third film fixing part 140 is fixed together with the first film fixing part 120 and the second film fixing part 130, so this can ensure that the position of the release film is fixed and unchanged, and the release film only deforms downward. In this case, sedimentation exposure can be achieved, that is, the release film is immersed in the interior of the photosensitive resin, which makes the exposure and curing area located inside the photosensitive resin, away from the surface of the photosensitive resin, less affected by the environment, and can speed up the replenishment speed of the photosensitive resin; the exposure and curing area is in the area where the release film is located, and a DLP (Digital Light Processing) exposure splicing solution can be implemented, so large-format printing can be performed.

[0039] In some embodiments, the rigid transparent light plate 110 is integrally provided with the third film fixing part 140. Since the rigid transparent light plate 110 and the third film fixing part 140 are integrally provided, during the production process, the rigid transparent light plate 110 and the third film fixing part 140 can be produced using the same mold, thereby improving production efficiency.

[0040] 3 and 5 , in some embodiments, the first film fixing part 120 is provided with a first groove 121; the second film fixing part 130 is provided with a second groove 131, and the first groove 121 matches the second groove 131; the third film fixing part 140 is provided with a second protrusion 142 matching the first groove 121 and the second groove 131, for detachably fixing the first film fixing part 120 and the second film fixing part 130; the four sides of the first film fixing part 120 are in contact with the lower surface of the release film, and the four sides of the second film fixing part 130 are in contact with the upper surface of the release film, and the first film fixing part 120 and the second film fixing part 130 are detachably fixed to the release film by locking.

[0041] 4 and 7 , the film fixing part 101 includes a first film fixing part 120, a second film fixing part 130, and a third film fixing part 140. The release film and the rigid transparent light plate 100 are detachably fixed by the first film fixing part 120 and the second film fixing part 130. The third film fixing part 140 is used to detachably fix to the first film fixing part 120 and the second film fixing part 130. The release film and the rigid transparent light plate 110 of the film stretching assembly 100 provided in the embodiment of the present application are both detachable, which facilitates replacement and updating of the release film and the rigid transparent light plate 110. Since only the release film and / or the rigid transparent light plate 110 of the film stretching assembly 100 can be replaced, while the other parts of the film stretching assembly 100 are retained, the cost of replacing and updating the film stretching assembly 100 can be further reduced. Since the release film can be replaced according to the different photosensitive resins, the application range of the film stretching assembly 100 can also be expanded.

[0042] In some embodiments, the second film fixing part 130 is provided with a plate groove (not shown in FIG7 ) that matches the rigid transparent light plate 110 for detachably fixing the rigid transparent light plate 110. In other embodiments, the rigid transparent light plate 110 and the second film fixing part 130 may also be provided integrally.

[0043] Referring to Figure 7, in some embodiments, the first film fixing part 120 is provided with a first groove 121 for placing the release film; the second film fixing part 130 is provided with a first protrusion 132 matching the first groove 121, for detachably fixing the release film together with the first film fixing part; the second film fixing part 130 is also provided with a second groove 131, and the third film fixing part 140 is provided with a second protrusion 142 matching the second groove 131, for detachably fixing with the first film fixing part 120 and the second film fixing part 130; the plate groove (not shown in Figure 7) in the second film fixing part 130 that matches the rigid transparent light plate 110 is provided at the edge of the first protrusion 132.

[0044] Referring to Figure 7, in some embodiments, the first film fixing part 120 is provided with a first groove 121 for placing the release film and the rigid transparent light plate 110; the second film fixing part 130 is provided with a first protrusion 132 matching the first groove 121, for detachably fixing the release film and the rigid transparent light plate 110 together with the first film fixing part; the second film fixing part 130 is also provided with a second groove 131, and the third film fixing part 140 is provided with a second protrusion 142 matching the second groove 131, for detachably fixing with the first film fixing part 120 and the second film fixing part 130.

[0045] Referring to Figures 1 to 7 , in some embodiments, the rigid transparent light plate 110 is provided with a plurality of vents 111 for guiding oxygen or air into contact with the release film. Because the rigid transparent light plate 110 is provided with a plurality of vents 111, external oxygen or air can pass through the plurality of vents 111 and contact the release film. This solves the problem of being unsuitable for release films that require oxygen or air for release. This makes the film stretching assembly 100 of the present application suitable for a variety of release films, expanding its scope of application.

[0046] 1 to 7 , in some embodiments, a plurality of air holes 111 are evenly distributed around the rigid transparent light plate 100. Since the plurality of air holes 111 are evenly distributed around the rigid transparent light plate 100, and the exposure and curing area is located below the central area of ​​the release film, the plurality of air holes 111 do not affect the exposure and curing area. Furthermore, the evenly distributed plurality of air holes 111 can more quickly and evenly guide oxygen or air into contact with the release film, thereby improving the release effect of release films that require oxygen or air for release.

[0047] In some embodiments, the release film includes an oxygen-permeable release film for generating oxygen inhibition. In related art, the photocuring reaction occurs on the lower surface of the release film, and the release process is affected by the pulling effect of the release film. Since the cured model has poor strength, the smaller the size, the weaker the strength. Therefore, the pulling of the release film can easily damage the model, making it difficult to produce a precise structure. The oxygen-permeable release film of the embodiment of the present application has high air permeability. Due to the oxygen inhibition phenomenon, the photocuring reaction is inhibited in the presence of oxygen. A thin layer of photosensitive resin is formed between the model and the lower surface of the release film, and cross-linking and curing will not occur. There is no adhesion between the model and the lower surface of the release film, and the release force generated during release is very small. Therefore, the liquid layer is stable, the printing precision is high, and the printing speed and success rate are greatly improved.

[0048] Please refer to FIG8 , which is a schematic structural diagram of an embodiment of a light-curing 3D printing device of the present application.

[0049] The device includes: a resin tank 10, a resin tank moving mechanism 20, a light source and projection assembly 30, a film stretching assembly 100, a printing platform 40, a platform moving mechanism 50 and a control mechanism (not shown).

[0050] The resin tank 10 is used to contain liquid photosensitive resin; the resin tank moving mechanism 20 is used to carry and drive the resin tank 10 to move in the vertical direction; the light source and projection assembly 30 includes a projection lens (not shown) and a light outlet 31, and the light source and projection assembly 30 is used to provide a light source for the photosensitive resin undergoing a photocuring reaction, and guide the light source from the light outlet 31 to the photosensitive resin; the film stretching assembly 100 is arranged at the position of the light outlet 31, and the release film is located on the focal plane of the projection lens 31; the printing platform 40 is used to support and fix the model formed by the curing of the photosensitive resin during the printing process; the platform moving mechanism 50 is used to carry and drive the printing platform 40 to move in the vertical direction to achieve continuous printing; the control mechanism is used to control the movement of the resin tank moving mechanism 20 and the platform moving mechanism 50.

[0051] The light source and projection assembly 30 typically includes an optical engine, an industrial camera, a beam splitter, a projection lens, and an optical path system connection structure. The light source driver and spatial light modulator are built into the optical engine. The optical engine projects ultraviolet light onto the beam splitter, which then reflects it to the projection lens. The optical path of the light source projected by the optical engine is perpendicular to the projection path of the industrial camera and projection lens. The beam splitter is installed at a 45-degree angle to the centerline of the optical path between the industrial camera and projection lens.

[0052] The optical engine is the primary component affecting the light source, and the most important component within the optical engine is the microdisplay chip, which can be a reflective LCD screen or a digital optical demodulator. Reflective LCD screens are believed to offer better image brightness and contrast than traditional transmissive LCD screens. Each pixel in a digital optical demodulator adjusts the polarization state of reflected light based on an applied voltage. In contrast, each pixel in a digital optical demodulator is a tiny mirror that controls the direction of reflected light by deflecting the micromirror. Each mirror in the digital optical demodulator can deflect between -10° and 10°. This way, brighter pixels represent reflected light entering the lens, while darker pixels represent darker pixels. The grayscale of the image is controlled by the frequency of mirror deflection. The chip in the digital optical demodulator offers better UV compatibility and higher contrast than LCD chips. In some embodiments, the light source can utilize a DLP (Digital Light Processing) light source, which can further improve product precision.

[0053] In the embodiment of the present application, the film assembly 100 is arranged at the position of the light outlet 31, and the release film of the film assembly 100 is located on the focal plane of the projection lens 31. Therefore, it is possible to avoid removing the film assembly before each printing sample, and avoid leveling and focusing operations on the film assembly before the next printing, thereby improving the stability and consistency of the printed product. In addition, the film assembly 100 is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is attached to the upper surface of the release film. In this way, during the process of printing an object by the light-curing 3D printing device, the rigid transparent light plate can prevent the release film from deforming upward, and the release film can only deform downward, thereby being able to produce a release effect with the printed object. Therefore, the film assembly 100 provided in the embodiment of the present application can use the release film to quickly flatten the liquid surface of the photosensitive resin to be printed and prevent the release film from deforming upward, thereby greatly shortening the time for the liquid surface of the photosensitive resin to level, thereby improving the efficiency of 3D printing.

[0054] It should be understood that the terms used in the present specification are only used to describe specific embodiments and are not intended to limit the present application.

[0055] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0056] The above descriptions are merely specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A film stretching assembly, applied to a light-curing 3D printing device, is characterized in that, The film tensioning assembly includes: A release film for fixing the liquid surface of the liquid photosensitive resin at the focal plane of the stereolithography 3D printing device, and the focal plane is in the first direction of the release film; A rigid transparent light plate attached to the surface of the release film in the second direction for preventing the release film from deforming in the second direction, and the first direction is opposite to the second direction; Film fixing parts, by which the release film and the rigid transparent light plate are fixed.

2. The film stretching assembly according to claim 1, wherein, The film fixing parts include a first film fixing part, a second film fixing part and a third film fixing part, and the release film is detachably fixed by the first film fixing part and the second film fixing part; The third film fixing part is provided with a plate groove matching the rigid transparent light plate for detachably fixing the rigid transparent light plate; The third film fixing part is used for detachably fixing with the first film fixing part and the second film fixing part.

3. The film stretching assembly according to claim 2, wherein, The first film fixing part is provided with a first groove for placing the release film; The second film fixing part is provided with a second groove and a first protrusion matching the first groove, and the release film is detachably fixed by the first groove and the first protrusion; The third film fixing part is provided with a second protrusion matching the second groove for detachably fixing with the first film fixing part and the second film fixing part.

4. The film stretching assembly according to claim 3, characterized in that, The plate groove is arranged at the edge of the second protrusion.

5. The film stretching assembly according to claim 1, wherein The film fixing parts include a first film fixing part, a second film fixing part and a third film fixing part, and the release film and the rigid transparent light plate are detachably fixed by the first film fixing part and the second film fixing part; A third film fixing part for detachably fixing with the first film fixing part and the second film fixing part.

6. The film stretching assembly according to claim 5, wherein, The second film fixing part is provided with a plate groove matching the rigid transparent light plate for detachably fixing the rigid transparent light plate.

7. The film stretching assembly according to claim 6, wherein, The first film fixing part is provided with a first groove for placing the release film; The second film fixing part is provided with a first protrusion matching the first groove for detachably fixing the release film together with the first film fixing part.

8. The film stretching assembly according to claim 7, wherein, The plate groove is arranged at the edge of the first protrusion.

9. The film stretching assembly according to claim 5, characterized in that, The first film fixing part is provided with a first groove for placing the release film and the rigid transparent light plate; The second film fixing part is provided with a first protrusion matching the first groove for detachably fixing the release film and the rigid transparent light plate together with the first film fixing part.

10. The film tensioning assembly according to any one of claims 1-9, characterized in that, The rigid transparent light plate is provided with a plurality of ventilation holes for guiding oxygen or air to contact the release film.

11. The film stretching assembly according to claim 10, wherein The plurality of ventilation holes are evenly distributed around the rigid transparent light plate.

12. A photocuring 3D printing device, characterized in that, Including the film tensioning assembly according to any one of claims 1-11.

Images