Film stretching assembly and photocuring 3D printing device

Abstract

The utility model discloses a film stretching assembly and a photocuring 3D printing device, the film stretching assembly comprises a release film used for fixing the liquid level of liquid photosensitive resin on the focal plane of the photocuring 3D printing device, and the focal plane is located in the first direction of the release film; the rigid transparent light plate is attached to the surface, in the second direction, of the release film and used for preventing the release film from deforming in the second direction, and the first direction is opposite to the second direction; and a film fixing part, wherein the release film and the rigid transparent light plate are fixed through the film fixing part. In this way, the liquid level leveling time of the photosensitive resin on the release film can be shortened, and the 3D printing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, and in particular to a film stretching component and a light-curing 3D printing device. Background Art

[0002] With its high precision, high efficiency and diversity, photocuring 3D printing technology has become an important tool in the field of product design and manufacturing. Its working principle is: the photocuring 3D printing device contains a resin tank inside, and a UV light source is installed above the resin tank. When printing, the liquid surface of the photosensitive resin in the resin tank is fixed at the focal plane by the release film, and then under the irradiation of ultraviolet rays, the photosensitive resin undergoes chemical cross-linking, thereby solidifying into a solid object, and then the platform descends, and the liquid resin is replenished and exposed again. By repeating this process continuously, the entire 3D printing process is finally completed. However, the current release film is relatively soft and easily affected by the liquid level height, platform area, cross-sectional area of ​​the cured area, etc. The release film is prone to deformation, resulting in an increase in the time for the liquid surface of the photosensitive resin on the release film to level, affecting the efficiency of 3D printing. Utility Model Content

[0003] Based on this, the embodiments of the utility model provide a film stretching assembly and a light-curing 3D printing device, which can shorten the time for the liquid surface of the photosensitive resin on the release film to level, and improve the efficiency of 3D printing.

[0004] In a first aspect, an embodiment of the utility model provides a film stretching assembly, which is applied to a light-curing 3D printing device, and the film stretching assembly includes:

[0005] 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;

[0006] a rigid transparent light plate, which is in contact with the surface of the release film in the second direction and is used to prevent the release film from deforming in the second direction, wherein the first direction is opposite to the second direction;

[0007] The film fixing part is used to fix the release film and the rigid transparent light plate.

[0008] In a second aspect, an embodiment of the utility model further provides a light-curing 3D printing device, which includes a film stretching assembly as described in the first aspect and a light source and a projection assembly with a light outlet; the film stretching assembly is arranged at the light outlet.

[0009] In the embodiment of the utility model, 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, and the rigid transparent light plate 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 block the deformation of the release film 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 utility model 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

[0010] Figure 1 This is a structural schematic diagram of an embodiment of the film stretching assembly of the utility model;

[0011] Figure 2 It is a structural schematic diagram of another embodiment of the film stretching assembly of the utility model;

[0012] Figure 3 It is a structural schematic diagram of another embodiment of the film stretching assembly of the utility model;

[0013] Figure 4 It is a structural schematic diagram of another embodiment of the film stretching assembly of the utility model;

[0014] Figure 5 It is a structural schematic diagram of another embodiment of the film stretching assembly of the utility model;

[0015] Figure 6 It is a structural schematic diagram of another embodiment of the film stretching assembly of the utility model;

[0016] Figure 7 It is a structural schematic diagram of another embodiment of the film stretching assembly of the utility model;

[0017] Figure 8 It is a structural schematic diagram of an embodiment of the light-curing 3D printing device of the utility model.

[0018] Description of main components and symbols:

[0019] 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

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the 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 change according to actual conditions.

[0022] With its high precision, high efficiency and diversity, photocuring 3D printing technology has become an important tool in the field of product design and manufacturing. Its working principle is: the photocuring 3D printing device contains a resin tank inside, and a UV light source is installed above the resin tank. When printing, the liquid surface of the photosensitive resin in the resin tank is fixed at the focal plane by the release film, and then under the irradiation of ultraviolet rays, the photosensitive resin undergoes chemical cross-linking, thereby solidifying into a solid object, and then the platform descends, and the liquid resin is replenished and exposed again. By repeating this process continuously, the entire 3D printing process is finally completed. However, the current release film is relatively soft and easily affected by the liquid level height, platform area, cross-sectional area of ​​the cured area, etc. The release film is prone to deformation, resulting in an increase in the time for the liquid surface of the photosensitive resin on the release film to level, affecting the efficiency of 3D printing.

[0023] In the embodiment of the utility model, 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, and the rigid transparent light plate 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 block the deformation of the release film 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 utility model 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.

[0024] It should be noted that the photosensitive resin in the embodiment of the present invention refers to all materials that can be used for photocuring 3D printing, for example, photosensitive resin, photosensitive resin doped with ceramic slurry, and photosensitive resin doped with metal slurry.

[0025] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0026] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 It is a schematic diagram of the structure of two embodiments of the film stretching assembly of the utility model. 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. In the process of the light-curing 3D printing device printing an object, 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 in contact with 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 below the release film, and the second direction of the release film is above the release film, or the first direction of the release film is above the release film, and the second direction of the release film is below the release film.

[0027] The film stretching assembly 100 in the embodiment of the utility model 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, so that in the process of printing an object by a light-curing 3D printing device, the rigid transparent light plate can block the deformation of the release film in the second direction, and the release film can only deform in the first direction, so that it can produce a release effect with the printed object. Therefore, the film stretching assembly 100 provided in the embodiment of the utility model can use the release film to quickly flatten the liquid surface of the photosensitive resin to be printed and block the deformation of the release film, thereby greatly shortening the time for the liquid surface of the photosensitive resin to level, thereby improving the efficiency of 3D printing.

[0028] 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 allow the light source to pass 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 is separated 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 through self-leveling. However, the current release film is relatively soft and is easily affected by the liquid level, 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 protrusion of the release film is different, resulting in uncontrollable liquid layer thickness and poor printing effect; (2) When the viscosity of the photosensitive resin itself is very large, or the viscosity is very high due to the doping of particles in the middle of the photosensitive resin, the release film will be deformed due to the infiltration of the photosensitive resin. When the viscosity of the photosensitive resin is very high, the deformed release film cannot return to a flat state naturally 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 sink downward.

[0029] In response to the above technical problem (1), the film stretching assembly 100 in the embodiment of the utility model 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, so that in 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, so that it can produce a release effect with the printed object. Therefore, the film stretching assembly 100 provided in the embodiment of the utility model 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, so as to greatly shorten the time for the liquid surface of the photosensitive resin to be leveled, thereby improving the efficiency of 3D printing.

[0030] In response to the above technical problem (2), the film stretching assembly 100 in the embodiment of the utility model is provided with a rigid transparent light plate 110, and the rigid transparent light plate 110 is in contact with 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 block the upward deformation of the release film, 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.

[0031] In response to the above technical problem (3), the film stretching assembly 100 in the embodiment of the utility model 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 block the upward deformation of the release film, thereby reducing the leveling problem caused by the viscosity. This makes the film stretching assembly 100 of the embodiment of the utility model applicable to both high-viscosity and low-viscosity photosensitive resins, thereby expanding the application scope of the film stretching assembly 100.

[0032] In response to the above technical problem (4), the film stretching assembly 100 in the embodiment of the utility model 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 sunken due to the low liquid level of the photosensitive resin. Therefore, the use of the film stretching assembly 100 in the embodiment of the utility model will not be limited by the liquid level of the photosensitive resin.

[0033] See also Figure 3 and Figure 4 , Figure 3 and Figure 4 It is a schematic diagram of the structure of two other embodiments of the film stretching assembly of the utility model. 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 detachably 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 matching the rigid transparent light plate 110, which is used to detachably fix the rigid transparent light plate 110. The third film fixing part 140 is used to detachably fix with the first film fixing part 120 and the second film fixing part 130. Among them, the detachable fixation can be achieved by locking.

[0034] The release film and the rigid transparent light plate 110 of the film stretching assembly 100 provided in the embodiment of the utility model are both detachable, which is helpful for replacing and updating 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 and other parts of the film stretching assembly 100 need to be retained, 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 application scope of the film stretching assembly 100 can also be expanded.

[0035] See also Figure 5 In some embodiments, the release film comprises a rectangular release film. Figure 6 In some embodiments, the release film includes a circular release film. Among them, the rectangular release film has a relatively large area. The circular release film can ensure the area required by the release film on the one hand, and can more effectively reduce the area of ​​the release film compared to release films of other shapes on the other hand. The film stretching assembly 100 in the embodiment of the utility model 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, so that 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, which makes the film stretching assembly 100 of the embodiment of the utility model applicable to release films of various shapes, expanding the scope of application of the film stretching assembly 100.

[0036] See also Figure 4 and Figure 6 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 second groove 131 and a first protrusion 132 matching the first groove 121, and the release film is detachably fixed by the first groove 121 of the first film fixing part 120 and the first protrusion 132 of the second film fixing part 130; the third film fixing part 140 is provided with a second protrusion 142 matching the second groove 131, and is used to be detachably fixed to the first film fixing part 120 and the second film fixing part 130. In some embodiments, the plate groove 141 is provided at the edge of the second protrusion 142.

[0037] In the film stretching assembly 100 provided by the embodiment of the utility model, since the release film is fixed together by the first film fixing part 120 and the second film fixing part 130, and the third film fixing part 140 is fixed together with the first film fixing part 120 and the second film fixing part 130, it 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 realized, that is, the release film is immersed in the interior of the photosensitive resin, so that the exposure and curing area is located inside the photosensitive resin, away from the surface of the photosensitive resin, less affected by the environment, and can speed up the photosensitive resin replenishment speed; the exposure and curing area is in the area where the release film is located, and the DLP (Digital Light Processing) exposure splicing solution can be realized, so large-format printing can be performed.

[0038] 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 is integrally provided with the third film fixing part 140, 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.

[0039] See also Figure 3 and Figure 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, and is used to detachably fix 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.

[0040] See also Figure 4 and Figure 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 be detachably fixed with 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 by the embodiment of the utility model are both detachable, which is helpful for the replacement and update 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, and other parts of the film stretching assembly 100 are retained, the cost of replacement and update of the film stretching assembly 100 can be further reduced. Since the release film adapted to the photosensitive resin can be replaced according to the different photosensitive resins, the application scope of the film stretching assembly 100 can also be expanded.

[0041] In some embodiments, the second film fixing part 130 is provided with a plate groove ( Figure 7 (not shown) for detachably fixing the rigid transparent light plate 110. In other embodiments, the rigid transparent light plate 110 may also be integrally provided with the second film fixing part 130.

[0042] See also Figure 7In 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, and is used to detachably fix 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, and is used to detachably fix with the first film fixing part 120 and the second film fixing part 130; the plate groove ( Figure 7 (not shown) is disposed at the edge of the first protrusion 132.

[0043] See also 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, and is used to detachably fix 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, and is used to detachably fix with the first film fixing part 120 and the second film fixing part 130.

[0044] See also Figures 1 to 7 In some embodiments, the rigid transparent light plate 110 is provided with a plurality of air holes 111 for guiding oxygen or air to contact the release film. Since the rigid transparent light plate 110 is provided with a plurality of air holes 111, external oxygen or air can contact the release film through the plurality of air holes 111, thus solving the problem that the release film that needs oxygen or air to achieve the release effect is not applicable, which makes the film stretching assembly 100 of the embodiment of the utility model applicable to various types of release films, expanding the scope of application of the film stretching assembly 100.

[0045] See also Figures 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 middle area of ​​the release film, the plurality of air holes 111 will not affect the exposure and curing area, and the evenly distributed plurality of air holes 111 can guide oxygen or air to contact the release film more quickly and evenly, thereby improving the release effect of the release film that requires oxygen or air to achieve the release effect.

[0046] In some embodiments, the release film includes an oxygen-permeable release film for generating oxygen inhibition. In the 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. The solidified model has poor strength, and the smaller the size, the worse the strength. Therefore, the pulling of the release film can easily damage the model, making it difficult to make a precise structure. The oxygen-permeable release film of the embodiment of the utility model has high air permeability. Due to the oxygen inhibition phenomenon, the photocuring reaction will be inhibited in the presence of oxygen. There is a thin layer of photosensitive resin between the model and the lower surface of the release film, and cross-linking and curing will not occur. There is no bonding between the model and the lower surface of the release film. The release force generated during release is very small. Therefore, the liquid layer is stable, the printing precision is high, and the printing rate and success rate are greatly improved.

[0047] See also Figure 8 , Figure 8 It is a structural schematic diagram of an embodiment of the light-curing 3D printing device of the utility model.

[0048] The device comprises: 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).

[0049] 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 focusing 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.

[0050] The light source and projection assembly 30 may generally include an optical machine, an industrial camera, a beam splitter, a projection lens, and an optical path system connection structure; the light source driver and the spatial light modulator are built into the optical machine, and the optical machine projects ultraviolet light onto the beam splitter, which is then reflected to the projection lens by the beam splitter. The light path of the light source projected by the optical machine is perpendicular to the projection light path of the industrial camera and the projection lens, and the beam splitter is installed at 45 degrees on the center line of the light path of the industrial camera and the projection lens.

[0051] The optical machine is the main component that affects the light source, and the most important component in the optical machine is the micro display chip, which can be a reflective LCD screen or a digital optical demodulator. The reflective LCD screen is considered to have better image brightness and contrast than the traditional transmissive LCD screen. Each pixel of it will adjust the polarization state of the reflected light according to the applied voltage; and each pixel in the digital optical demodulator is a tiny reflector, which controls the direction of the reflected light by deflecting the micro mirror surface. Each lens in the digital optical demodulator can be deflected by -10° to 10°. In this way, the brighter pixels are the reflected light entering the lens, and the opposite is the dark pixel, that is, the grayscale of the image is controlled by the frequency of the lens deflection, and the chip in the digital optical demodulator has better ultraviolet compatibility and higher contrast than the liquid crystal chip. In some embodiments, the above-mentioned light source can adopt a DLP (Digital Light Processing) light source. By adopting a DLP light source, the accuracy of the product can be further improved.

[0052] In the embodiment of the utility model, 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 taking out the film assembly before taking out the printed sample each time, 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 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 film assembly 100 provided in the embodiment of the utility model 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.

[0053] It should be understood that the terms used in the description of the present invention are only for the purpose of describing specific embodiments but are not intended to limit the present invention.

[0054] It should also be understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0055] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A film stretching assembly, applied to a light-curing 3D printing device, characterized in that: The film stretching assembly comprises: 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; a rigid transparent light plate, which is in contact with the surface of the release film in the second direction and is used to prevent the release film from deforming in the second direction, wherein the first direction is opposite to the second direction; The film fixing part is used to fix the release film and the rigid transparent light plate.

2. The film stretching assembly according to claim 1, characterized in that: The film fixing part comprises 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, and is used for detachably fixing the rigid transparent light plate; The third film fixing part is used to be detachably fixed to the first film fixing part and the second film fixing part.

3. The film stretching assembly according to claim 2, characterized in that: 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, and is used for being detachably fixed to 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, characterized in that: The film fixing part includes 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; The third film fixing part is used to be detachably fixed to the first film fixing part and the second film fixing part.

6. The film stretching assembly according to claim 5, characterized in that: The second film fixing part is provided with a plate groove matching the rigid transparent light plate, and is used for detachably fixing the rigid transparent light plate.

7. The film stretching assembly according to claim 6, characterized in that: 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, and is used for detachably fixing the release film together with the first film fixing part.

8. The film stretching assembly according to claim 7, characterized in that: 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, and is used for detachably fixing the release film and the rigid transparent light plate together with the first film fixing part.

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

11. The film stretching assembly according to claim 10, characterized in that: The plurality of air holes are evenly distributed around the rigid transparent light plate.

12. A light-curing 3D printing device, characterized in that: It comprises a film stretching assembly as described in any one of claims 1 to 11 and a light source and a projection assembly with a light outlet; the film stretching assembly is arranged at the light outlet.

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