Photocuring 3D printing equipment

Abstract

The utility model provides photocuring 3D printing equipment which comprises a trough, a light source and a lens assembly, and the trough is used for containing materials to be cured; the light source and the trough are oppositely arranged; the lens assembly is arranged between the light source and the trough, the lens assembly comprises a rotating assembly and at least two lenses arranged on the rotating assembly, the at least two lenses comprise a first lens and a second lens, the rotating assembly comprises at least two fixing seats capable of relatively rotating, and the fixing seats are arranged on the rotating assembly. The at least two fixing seats comprise a first fixing seat and a second fixing seat, the first fixing seat is fixedly connected with the first lens, the second fixing seat is fixedly connected with the second lens, and refraction parameters of the at least two lenses are different. The photocuring 3D printing equipment solves the technical problem that the printing area of the photocuring 3D printing equipment is inconvenient to adjust.

Description

Technical Field

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

[0002] Photocuring 3D printing equipment, such as photocuring 3D printers, uses light to irradiate liquid photosensitive resin and trigger a photochemical reaction, so that the photosensitive resin in the area irradiated by the light source is solidified from the liquid, and the photocuring effect is achieved layer by layer, and finally a molding model required for 3D printing is formed.

[0003] The light-curing 3D printing equipment uses a light source system with constant radiation energy. In the related technology, it is necessary to evenly illuminate the entire screen under the Liquid Crystal Display (LCD) screen, and then use the LCD screen to control the area that needs to be exposed for printing. Because the total energy of the light source is constant, if the printing area is too large, the radiation energy per unit area will be lower, and the 3D printing speed will be slower, which will affect the printing efficiency. If the printing area is too small, it may not be able to meet the user's printing needs for larger models.

[0004] Therefore, it is urgent to solve the technical problem that the printing area and printing speed of light-curing 3D printing equipment cannot meet the needs, so as to improve the printing efficiency of the model. Utility Model Content

[0005] The utility model provides a light-curing 3D printing device, which solves the technical problem that the printing area and printing speed of the light-curing 3D printing device cannot meet the requirements.

[0006] In order to achieve the above object, the utility model provides a light-curing 3D printing device, comprising:

[0007] A material trough, the material trough is used to hold the material to be cured;

[0008] A light source, the light source being arranged opposite to the material trough;

[0009] A lens assembly, wherein the lens assembly is arranged between the light source and the material trough, the lens assembly includes a rotating assembly and at least two lenses arranged on the rotating assembly, the at least two lenses include a first lens and a second lens, the rotating assembly includes at least two fixed seats that can rotate relative to each other, the at least two fixed seats include a first fixed seat and a second fixed seat, the first fixed seat is fixedly connected to the first lens, the second fixed seat is fixedly connected to the second lens, and the refractive parameters of the at least two lenses are different.

[0010] The utility model provides a light-curing 3D printing device. Since the lens assembly includes a rotating assembly and at least two lenses arranged on the rotating assembly, the rotating assembly includes at least two fixed seats that can rotate relatively, so that the at least two lenses can be converted for use, and it is convenient to selectively rotate one of the at least two lenses to the light path between the light source and the material trough. The refractive parameters of the lenses are different, so the lens used can be flexibly adjusted according to the size of the printed model. It is convenient to use a lens with a smaller refractive parameter when printing a smaller model, so that the spot area of ​​the light source irradiating the horizontal plane is smaller, which is beneficial to increase the radiation energy of the light per unit area radiated to the printing screen and improve the printing speed.

[0011] In one possible implementation, the photocuring 3D printing device also includes a base, the number of the light source is one, the light source is fixedly disposed in the base, and the rotating assembly is configured to rotate relative to the base so that one of the at least two lenses is located on the optical path between the light source and the material trough.

[0012] In a possible implementation, the light-curing 3D printing device further includes a base;

[0013] The number of the light sources is at least two, each of the light sources is rotatably arranged in the base relative to each of the lenses, and the rotation centerline of each of the light sources coincides with the rotation centerline of each of the lenses; or,

[0014] The number of the light sources is consistent with the number of the lenses, each of the lenses is located on the optical path between each of the light sources and the material trough, and the light sources are fixedly connected with the lenses in a one-to-one correspondence.

[0015] In a possible implementation, the rotating assembly includes a rotating disk, the at least two fixing seats are connected to the rotating disk, and each of the fixing seats rotates around a center line of the rotating disk.

[0016] In a possible implementation, the rotating assembly further includes a rotation driving member, which is disposed in the base, and an output shaft of the rotation driving member is connected to a center position of the turntable.

[0017] In a possible implementation, the light-curing 3D printing device further includes a light shielding member, which is arranged around the periphery of the light source, and a light-transmitting hole is provided on a side of the light shielding member facing the material trough; and / or,

[0018] The photocuring 3D printing device also includes a processor, which is electrically connected to the rotating component. The processor is configured to read the placement position information of the model to be printed in the slice file of the three-dimensional model to generate a first control signal, and send the generated first control signal to the rotating component. The first control signal is used to instruct the rotating component to drive the lens and / or the light source to rotate.

[0019] In a possible implementation, at least two mounting holes are opened in the turntable, the lenses are correspondingly arranged in the mounting holes, and the distance between the center of each lens and the center of the turntable is consistent.

[0020] In one possible implementation, a avoidance hole is opened in the fixing seat, and the lens includes a lens body and a flange arranged on the edge of the lens body, the lens body corresponds to the position of the avoidance hole, and the flange extends between the fixing seat and the turntable.

[0021] In a possible implementation, the photocuring 3D printing device further includes: a Fresnel lens and a printing screen, wherein the Fresnel lens is arranged between the lens assembly and the printing screen.

[0022] In a possible implementation, the distance L2 between the Fresnel lens and the light source and the focal length F of the Fresnel lens satisfy: 0.7≤F / L2≤1.3, and the distance L3 between the Fresnel lens and the printing screen satisfies: L3≤5mm; and / or,

[0023] The diameter D of each of the light sources satisfies: 1 mm ≤ D ≤ 20 mm, and the light emitting angle θ of each of the light sources is 5° ≤ θ ≤ 45°; and / or,

[0024] A side of the lens facing the light source is a first side, and a distance L1 is provided between the light source and the first side of the lens, wherein L1 satisfies L1≥1 mm.

[0025] The photocuring 3D printing device provided by the embodiment of the utility model can switch lenses with smaller refractive parameters by rotating the rotating component when the overall size of the three-dimensional model is small or when printing a layer with a smaller contour area, thereby increasing the light energy per unit area and the printing speed when printing a smaller model; and switching lenses with larger refractive parameters when printing a larger model to meet the user's printing needs for larger models, thereby realizing the user's diversified needs for printing area and printing speed.

[0026] In addition to the technical problems solved by the embodiments of the utility model described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by a photocuring 3D printing device provided by the embodiments of the utility model, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A three-dimensional structural schematic diagram of a partial structure of a light-curing 3D printing device provided in an embodiment of the utility model;

[0029] Figure 2 An exploded view of the local structure of a light-curing 3D printing device provided in an embodiment of the utility model;

[0030] Figure 3 A front view of a partial structure of a light-curing 3D printing device provided in an embodiment of the utility model;

[0031] Figure 4 A top view of the local structure of a light-curing 3D printing device provided in an embodiment of the utility model;

[0032] Figure 5 for Figure 4 A cross-sectional view of section AA;

[0033] Figure 6 A schematic diagram of the three-dimensional structure of a light-curing 3D printing device provided in an embodiment of the utility model;

[0034] Figure 7 A top view of a light-curing 3D printing device provided in an embodiment of the utility model;

[0035] Figure 8 for Figure 7 A cross-sectional view of the BB section;

[0036] Fig. 9 for Figure 7 Cross-sectional view of CC section.

[0037] Description of reference numerals:

[0038] 10- base;

[0039] 11-accommodating chamber;

[0040] 20-light source;

[0041] 31- turntable;

[0042] 311-Mounting hole;

[0043] 312-connection hole;

[0044] 32-lens;

[0045] 321- lens body;

[0046] 322- flange;

[0047] 33-rotation drive member;

[0048] 331-output shaft;

[0049] 34-rotation assembly;

[0050] 341-fixed seat;

[0051] 342-avoidance hole;

[0052] 40-Fresnel lens;

[0053] 50-Print Screen;

[0054] 60-shading member;

[0055] 61-Light transmission hole. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in 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 in 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.

[0057] The total energy of the light source remains unchanged. The larger the area to be printed, the lower the radiation energy per unit area. However, the lower the radiation energy, the slower the 3D printing speed, which will affect the printing efficiency. In actual use, not all models need to use the entire screen for printing. When the size of the printed model is small, it is not necessary to irradiate the entire screen. A lot of the screen area is non-exposure area, otherwise it will cause energy waste, accelerate the screen temperature rise and slow printing speed.

[0058] In view of this, the light-curing 3D printing device provided by the utility model can be rotated by setting a rotating component, which is convenient for switching lenses with different refractive parameters located on the light path of the light source, so that the lens used can be flexibly adjusted according to the size of the printed model, which is convenient for using lenses with smaller refractive parameters when printing smaller models, which is beneficial to increasing the radiation energy of light per unit area radiated to the printing screen and improving the printing speed. When printing larger models, lenses with larger refractive parameters can be used to meet printing needs.

[0059] The light-curing 3D printing device provided by the embodiment of the utility model is described below with reference to the accompanying drawings.

[0060] Embodiment 1

[0061] refer to Figure 1 and Figure 2 As shown, the utility model provides a photocuring 3D printing device, including: a material trough, a light source 20 and a lens assembly, the material trough is used to hold the material to be cured, the light source 20 is arranged opposite to the material trough, the lens assembly is arranged between the light source 20 and the material trough, the lens assembly includes a rotating assembly 34 and at least two lenses 32 arranged on the rotating assembly 34, the at least two lenses 32 include a first lens and a second lens, the rotating assembly 34 includes at least two fixed seats 341 that can rotate relatively, the at least two fixed seats 341 include a first fixed seat and a second fixed seat, the first fixed seat is fixedly connected to the first lens, the second fixed seat is fixedly connected to the second lens, and the refractive parameters of the at least two lenses 32 are different.

[0062] The utility model provides a photocuring 3D printing device. Since the lens assembly includes a rotating assembly 34 and at least two lenses 32 arranged on the rotating assembly 34, the rotating assembly 34 includes at least two fixed seats 341 that can rotate relatively, so that the at least two lenses 32 can be converted for use, thereby solving the technical problem that the printing area of ​​the photocuring 3D printing device is not convenient to adjust, and it is convenient to selectively rotate one of the at least two lenses 32 to the optical path between the light source 20 and the material trough. The refractive parameters of the at least two lenses 32 are different, so that the lens 32 used can be flexibly adjusted according to the size of the printed model, and it is convenient to use the lens 32 with a smaller refractive parameter when printing a smaller model, so that the spot area of ​​the light source 20 irradiating the horizontal plane is smaller, which is beneficial to increase the radiation energy of the light per unit area radiated to the printing screen 50 and improve the printing speed.

[0063] In this application, this application is not only applicable to LCD optical light sources, but also projects the entire layer of image onto photosensitive resin through a projection lens, and stacks and forms layer by layer. It is characterized by being able to complete the printing of the entire layer at one time, with the characteristics of fast printing speed and high precision. This application is also applicable to single-point light sources such as (Stereolithography Apparatus, referred to as SLA), which usually use ultraviolet lasers, single-point light sources, the smallest unit of printing is a point, layered printing, and each layer is scanned and printed by a point light source. After each layer of the plane is printed, it will move to the next layer, using photosensitive resin as the printing material, and printing three-dimensional solid models by curing layer by layer.

[0064] The refractive parameters of the lens 32 include the curvature of the lens. The curvature is calculated as follows: curvature radius R=f / (n×d), where R is the curvature radius of the lens 32, f is the focal length of the lens 32, n is the refractive index of the lens 32, and d is the diameter of the lens 32.

[0065] Since the at least two lenses 32 include a first lens and a second lens, the rotating assembly 34 includes at least two relatively rotatable fixed seats 341, and the at least two fixed seats 341 include a first fixed seat and a second fixed seat, the first fixed seat is fixedly connected to the first lens, and the second fixed seat is fixedly connected to the second lens, so when the first fixed seat and the second fixed seat are switched, the first lens and the second lens are switched. Since the refractive parameters of the first lens and the second lens are different, when a relatively large printing model size is required, it is convenient to select a lens 32 with a larger refractive parameter to ensure that the spot area irradiated by the light source 20 on the printing screen 50 is sufficient to meet the printing requirements for a larger model; and when a relatively small printing model size is required, a lens 32 with a smaller refractive parameter is selected to reduce the spot area irradiated by the light source 20 on the printing screen 50, increase the radiation energy of light per unit area radiated to the printing screen 50, and increase the printing speed.

[0066] The lens 32 can magnify the area of ​​the light spot irradiated by the light source 20. Since the refractive parameters of at least two lenses 32 are different, at least two lenses 32 have different refractive powers. When the light emitted by the light source 20 passes through different lenses 32, the area of ​​the light spot irradiated to the entire printing screen 50 will change under the action of the lenses 32. This is beneficial when the size of the printed model is small, switching the lens 32 with a smaller light spot area on the horizontal plane to coincide with the optical axis of the light source 20 can increase the radiation energy per unit area, thereby increasing the printing speed; and when the size of the printed model is large, switching the lens 32 with a larger refractive parameter to coincide with the optical axis of the light source 20 can ensure that the size and shape of the printed model are not affected.

[0067] In a possible implementation, the material tank is used to store photosensitive resin liquid. When the photosensitive resin liquid is irradiated by the light emitted by the light source 20, a polymerization reaction will occur and the solidification will be completed.

[0068] In a possible implementation, the light source 20 includes but is not limited to LED lamps, laser emitters and other components that can emit light of the wavelength required for curing liquid resin in the 3D printing process. For example, many ultraviolet lamp beads are evenly arranged in a row, with good uniformity and collimation; or an integral light source with higher uniformity is used; or a laser emitter and other components that can emit light of the wavelength required for curing liquid resin in the 3D printing process are used.

[0069] In one possible implementation, the light source 20 may be a COB (Chip On Board Light, abbreviated as COB) light source, that is, a light source in which multiple LED chips are integrated and packaged on the same substrate. It may also be an integrated light source, a point light source, or a surface light source.

[0070] In a possible implementation, the lens 32 may be a free-form surface lens. The lens 32 may have two convex surfaces; or one convex surface and the other concave surface; Figure 5 As shown, or one side is flat and the other side is convex.

[0071] In one possible implementation, reference Figure 2 and Figure 3 As shown, the photocuring 3D printing device also includes a base 10, a light source 20 is fixedly disposed in the base 10, and a rotating assembly 34 is configured to rotate relative to the base 10, so that one of the at least two lenses 32 is located on the light path between the light source 20 and the material trough.

[0072] refer to Figure 2 and Figure 3 As shown, the base 10 has a receiving cavity 11 therein. The base 10 is used to install the light source 20 and the rotating assembly 34. The base 10 may be cylindrical or cubic.

[0073] In a possible implementation, the rotating assembly 34 includes a rotating disk 31 , at least two fixing seats 341 connected to the rotating disk 31 , and each fixing seat 341 rotates around a center line of the rotating disk 31 .

[0074] In one possible implementation, the accommodating cavity 11 may be recessed from the top surface of the base 10 toward the inside of the base 10, the opening end of the accommodating cavity 11 is located on the top surface of the base 10, the turntable 31 covers the opening end of the accommodating cavity 11, and the turntable 31 may be disc-shaped.

[0075] In a possible implementation, the rotating assembly 34 further includes a rotation driving member 33 . The rotation driving member 33 is disposed in the base 10 , and an output shaft 331 of the rotation driving member 33 is connected to the center position of the turntable 31 .

[0076] The rotating driving member 33 can be fixedly connected to the inner bottom wall of the accommodating cavity 11 in the base 10 by fasteners such as screws. The rotating driving member 33 can be a motor or a rotating cylinder. The output shaft 331 of the rotating driving member 33 drives the turntable 31 to rotate, so that the turntable 31 drives the fixed seat 341 to rotate, thereby realizing that the lens 32 fixed on the fixed seat 341 rotates synchronously with the turntable 31.

[0077] A connecting hole 312 connected to the output shaft 331 is opened at the center of the turntable 31 . The end of the output shaft 331 may be connected to the connecting hole 312 , so that the output shaft 331 of the rotating driving member 33 is connected to the center of the turntable 31 .

[0078] In other possible implementations, the turntable 31 may also be rotated by being pushed manually.

[0079] In one possible implementation, reference Figure 2 and Figure 3 As shown, the light-curing 3D printing device further includes a light shielding member 60, which is arranged around the outer periphery of the light source 20, and a light-transmitting hole 61 is provided on a side of the light shielding member 60 facing the material trough. The light shielding member 60 is used to shield the light emitted by the light source 20, so that the position shielded by the light shielding member 60 is not light-transmitting, and the light emitted by the light source 20 is only emitted through the light-transmitting hole 61, which helps to increase the energy of the light irradiated on the printing screen 50.

[0080] In a possible implementation, the shading member 60 may be a shading cover to prevent light from passing through.

[0081] In one possible implementation, reference Figure 2 and Figure 4 As shown, at least two mounting holes 311 are provided in the turntable 31, and the lenses 32 are correspondingly arranged in the mounting holes 311, and the distance between the center of each lens 32 and the center of the turntable 31 is consistent. The purpose is to ensure that each lens 32 can be rotated to the light path of the light source 20 irradiating the printing screen 50 during the process of switching the lens 32 by rotating the turntable 31.

[0082] In a possible implementation, the number of mounting holes 311 is consistent with the number of lenses 32, and the mounting holes 311 can be circular, rectangular, diamond-shaped holes, etc., so that the lenses 32 can be installed. The lenses 32 are embedded in the mounting holes 311, and the lenses 32 can be fixed in the mounting holes 311 by colloid.

[0083] In a possible implementation, a relief hole 342 is provided in the fixing seat 341, and the lens 32 includes a lens body 321 and a flange 322 provided at the edge of the lens body 321, the lens body 321 corresponds to the position of the relief hole 342, and the flange 322 extends between the fixing seat 341 and the rotating disk 31. The flange 322 is clamped between the fixing seat 341 and the rotating disk 31, thereby fixing the lens 32.

[0084] The fixing base 341 may be a rectangular frame, and the fixing base 341 may be connected to the side of the turntable 31 facing the light source 20 by fasteners such as screws or bolts, so that the upper surface of the turntable 31 remains flat and beautiful. The edge of the fixing base 341 also serves to shield the gap between the mounting hole 311 and the lens body 321, thereby reducing the light leakage problem.

[0085] The avoidance hole 342 is used to allow the light emitted by the light source 20 to directly reach the lens body 321 , thereby preventing the fixing seat 341 from affecting the light emitted by the light source 20 from reaching the lens body 321 .

[0086] The lens body 321 and the flange 322 may be an integral part connected in one piece, and the flange 322 may be in the shape of a thin sheet. By providing the flange 322 , the installation and fixation of the lens 32 is made more convenient.

[0087] In one possible implementation, the number of lenses 32 can be two, namely a first lens and a second lens. When the same light source 20 is acted upon by the first lens and the second lens, the ratio of the spot area irradiated to the printing screen 50 can be 0.5:1 or 0.7:1.

[0088] In other possible implementations, the number of lenses 32 disposed on the turntable 31 may be three. For example, the ratio of the spot areas of the same light source 20 irradiated to the printing screen 50 under the action of three different lenses 32 is 0.3:0.7:1. Of course, the number of lenses 32 may also be 4 or 5, etc., which is not specifically limited here.

[0089] Among the multiple lenses 32 , the lens 32 with the largest refractive parameter makes the maximum spot area of ​​the light source 20 irradiating the printing screen 50 consistent with the area of ​​the printing screen 50 .

[0090] The utility model provides a light-curing 3D printing device, which also includes a control board, which can be arranged in the accommodating cavity 11, and is electrically connected to the rotating drive member 33. The control board controls the rotation angle of the output shaft 331 of the rotating drive member 33 to control the rotation angle of the turntable 31, so as to realize automatic replacement of different lenses 32 according to the size of the printed model, and then replace the lens 32 with a smaller refractive parameter when the printed contour area is narrowed, thereby increasing the printing energy per unit area, increasing the printing speed, and improving the flexibility of use. Among them, the control board can be a circuit board.

[0091] The utility model provides a light-curing 3D printing device, in which the rotating component 34 has a simple structure and is flexible and convenient to rotate, so that it is very convenient to adjust the lenses 32 with different refractive powers according to the size of the printed model and the size of the cross-sectional profile area, so that it is convenient to use the lenses 32 with smaller refractive parameters when printing smaller models, which is beneficial to increase the radiation energy of light per unit area radiated to the printing screen 50 and improve the printing speed.

[0092] In one possible implementation, reference Figure 6 and Figure 7 As shown, the light-curing 3D printing device further includes: a Fresnel lens 40 and a printing screen 50 , wherein the Fresnel lens 40 is arranged between the lens assembly and the printing screen 50 .

[0093] The Fresnel lens 40 can reduce the angle of light and improve the collimation of light. No matter whether the light beam irradiating the Fresnel lens 40 is vertical or inclined, the size of the printing spot projected onto the printing screen 50 is uniform, thereby improving the printing quality.

[0094] In one possible implementation, reference Figure 8 and Fig. 9 As shown, the distance L2 between the Fresnel lens 40 and the light source 20 and the focal length F of the Fresnel lens 40 satisfy: 0.7≤F / L2≤1.3, and the distance L3 between the Fresnel lens 40 and the printing screen 50 satisfies: L3≤5 mm.

[0095] It is easy to understand that if L2 is too large, it will affect the collimation of the light, causing the light to diverge at an angle, affecting the printing effect. If L2 is too small, it is easy to cause premature focusing, affecting the printing quality. The present application achieves effective control of the incident light beam angle by controlling 0.7≤F / L2≤1.3, so that the light can be directed to the printing screen 50 in parallel, avoiding the divergence of the light, thereby improving the accuracy of photocuring.

[0096] In one possible implementation, F / L2 may be, for example, 0.7, 0.8, 0.9, 0.95, 1, 1.1, 1.16, 1.2 or 1.3.

[0097] In a possible implementation, the distance L3 between the Fresnel lens 40 and the printing screen 50 may be, for example, 2 mm, 3 mm, 3.5 mm, 4 mm or 5 mm.

[0098] In a possible implementation, the light sources 20 are arranged in a circular shape, and the diameter D of the light source 20 of the light-curing 3D printing device satisfies: 1mm≤D≤20mm, and the light-emitting angle θ of the light source 20 is 5°≤θ≤45°. The size of the diameter D of the light source 20 is mainly used to control the energy of the light source 20. When the diameter D of the light source 20 is larger, the energy is higher, and the smaller the light-emitting angle θ of the light source 20 is, the greater the light intensity is.

[0099] In one possible implementation, the diameter D of the light source 20 of the photocuring 3D printing device may be 1 mm, 3 mm, 5.5 mm, 8.5 mm, 10 mm, 11 mm, 13 mm, 15 mm, 18.5 mm or 20 mm.

[0100] In a possible implementation, the light emitting angle θ of the light source 20 may be, for example, 5°, 15°, 30° or 45°.

[0101] In a possible implementation, the side of the lens 32 of the photocuring 3D printing device facing the light source 20 is the first side, and there is a distance L1 between the light source 20 and the first side of the lens 32, wherein L1 satisfies L1≥1mm. If L1 is too small, it will cause reflection and even burn the light source 20. If L1 is too large, it will cause low printing efficiency. Therefore, in this application, L1 satisfies L1≥1mm.

[0102] The utility model provides a light source system, which realizes a reasonable layout of the light path by designing the positions of the Fresnel lens 40, the light source 20, the printing screen 50 and the lens 32, improves the printing effect and ensures the printing accuracy.

[0103] In a possible implementation, the tooth surface of the Fresnel lens 40 faces the printing screen 50, and the plane of the Fresnel lens 40 faces the rotating assembly 34. The two opposite sides of the Fresnel lens 40 are the tooth surface and the plane, respectively. The tooth surface is the Fresnel surface, and the tooth surface has multiple circles of annular grooves. By setting the Fresnel lens 40, the angle of the light can be reduced and the printing accuracy can be improved.

[0104] In a possible implementation, a photocuring 3D printing device provided by the present invention further includes a frame, wherein the Fresnel lens 40 and the printing screen 50 are arranged on the frame, and the photocuring 3D printing device further includes a lifting mechanism and a molding platform.

[0105] In one possible implementation, the photocuring 3D printing device also includes a processor, which is electrically connected to the rotating component 34. The processor is configured to generate a first control signal based on the placement position information of the model to be printed in the slicing file of the three-dimensional model, and send the generated first control signal to the rotating component 34. The first control signal is used to instruct the rotating component 34 to drive the lens 32 and / or the light source 20 to rotate.

[0106] The print screen 50 has several areas of different sizes, such as area A, area B, and area C, wherein area A may include area B, and area B may include area C.

[0107] In this embodiment, when the photocuring 3D printing device reads the placement position information of the model to be printed in the slice file, it will accordingly know which area on the printing screen 50 the placement position of the model to be printed corresponds to, for example, the area is area A. The processor generates a first control signal based on the placement position information of the model to be printed, and sends the generated first control signal to the rotating drive member 33 of the rotating component 34, so that the rotating drive member 33 drives the turntable 31 to rotate.

[0108] In this embodiment, under the action of the rotating drive member 33, the turntable 31 drives the lens 32 to rotate to correspond to the A area of ​​the printing screen 50 for exposure printing. This can make the model forming position closer to the central axis of the lens, thereby improving the printing effect of the model, because the collimation of the light reaching the model forming position will be better.

[0109] During printing, the light source 20 forms a transmission area to be cured at the bottom of the material tank through the printing screen 50, and the photosensitive resin liquid located between the molding surface of the molding platform or the bottom of the solidified layer and the bottom of the material tank is solidified in the transmission area. In the process of forming the three-dimensional model layer by layer, the first solidified layer is reliably bonded to the molding surface of the molding platform. After each layer is solidified, the platform lifting mechanism will drive the molding platform to lift and lower in the material tank, so that the solidified layer is separated from the bottom of the material tank. At the same time, the height of the next layer of resin to be pre-cured is reserved between the solidified layer and the bottom of the material tank, so that the photosensitive resin liquid can fill the gap between the solidified layer and the bottom of the material tank to prepare for the next layer of solidification.

[0110] Taking into account that the maximum contour areas of different cross-sectional layers of a three-dimensional model may be inconsistent, during the printing process, when encountering a layer with a smaller contour area, the lens 32 can be switched by rotating the rotating component 34, thereby reducing the spot size irradiated to the printing screen 50 and increasing the radiation energy per unit area, thereby improving the photocuring efficiency. When encountering a layer with a larger contour area, the lens 32 can be switched by rotating the rotating component 34 to increase the spot size irradiated to the printing screen 50. This is flexible and convenient to use, ensuring printing quality while improving printing efficiency.

[0111] If the overall size of the three-dimensional model is small, the lens 32 can be switched by rotating the rotating assembly 34 before printing, so as to increase the light energy per unit area when printing a smaller model, thereby increasing the printing speed.

[0112] refer to Fig. 9 As shown, the dotted arrow indicates the path of the light emitted by the light source 20, which passes through the lens 32 and the Fresnel lens 40 in sequence and reaches the printing screen 50. This embodiment only requires one light source 20, and the energy of the light reaching the printing screen 50 is changed by rotating the turntable 31 to switch different lenses 32, thereby adjusting the printing speed.

[0113] Embodiment 2

[0114] The difference between the second embodiment and the first embodiment is that the photocuring 3D printing device further includes a base 10, the number of light sources 20 is at least two, each light source 20 is rotatably arranged in the base 10 relative to each lens 32, and the rotation center line of each light source 20 coincides with the rotation center line of each lens 32.

[0115] In this embodiment, the light source 20 rotates independently relative to the lens 32, so that one of the at least two light sources 20 can be adjusted and selected for use according to usage needs, and then in conjunction with the rotational movement of the rotating component 34, one of the at least two lenses 32 is selected to correspond to the position of the selected light source 20, that is, the lens 32 is located on the light path from the light source 20 to the printing screen 50, thereby improving the flexibility of adjustment.

[0116] In one possible implementation, at least two light sources 20 are of different types, for example, there are two light sources 20, which are a point light source and a surface light source, respectively. Of course, in other possible implementations, the number of light sources 20 can also be three or more.

[0117] In one possible implementation, in order to realize the rotation setting of each light source 20 relative to each lens 32, the photocuring 3D printing device also includes a bracket, and a motor can be set at the center of the bracket, so that the bracket is driven to rotate by the motor set at the center of the bracket. Each light source 20 is set on a side of the bracket facing the lens 32, and the distance between the center of each light source 20 and the center of the bracket is consistent. The bracket will rotate with each light source 20, thereby realizing the switching use of different light sources 20.

[0118] In this example, the bracket is located on the side of the lens assembly facing away from the printing screen 50 , and the bottom wall of the base 10 has a through hole for exposing the light source 20 , thereby preventing the bottom wall of the base 10 from blocking the light emitted by the light source 20 .

[0119] The print screen 50 has several areas of different sizes, such as area A, area B, and area C, wherein area A may include area B, and area B may include area C.

[0120] In this embodiment, when the photocuring 3D printing device reads the placement position information of the model to be printed in the slice file, it will accordingly know which area on the printing screen 50 the placement position of the model to be printed corresponds to, for example, the area is area A, and the processor generates a first control signal according to the placement position information of the model to be printed; and sends the generated first control signal to the rotating drive member 33 of the rotating component 34, so that the rotating drive member 33 drives the turntable 31 to rotate, and the processor also generates a second control signal according to the placement position information of the model to be printed, and sends the generated second control signal to the motor that drives the bracket to rotate, so that the bracket rotates with each light source 20.

[0121] In this embodiment, under the action of the rotating drive member 33, the turntable 31 drives the lens 32 to rotate to a position corresponding to the A area of ​​the printing screen 50, and the bracket with the light source 20 also rotates to a position corresponding to the A area of ​​the printing screen 50, so that the selected light source 20 and the lens 32 correspond to each other and perform exposure printing. In this way, the model forming position can be closer to the central axis of the light source and the central axis of the lens, thereby improving the printing effect of the model, because the collimation of the light reaching the model forming position will be better.

[0122] Embodiment 3

[0123] The difference between the third embodiment and the first embodiment is that the light-curing 3D printing device further includes a base 10, the number of light sources 20 is consistent with the number of lenses 32, each lens 32 is respectively located on the light path between each light source 20 and the material trough, and the light source 20 and the lens 32 are fixedly connected in a one-to-one correspondence to achieve synchronous rotation.

[0124] In this embodiment, the light source 20 and the lens 32 are fixedly connected in a one-to-one correspondence, ensuring that the positions of the light source 20 and the lens 32 are always aligned, achieving synchronous rotation of the light source 20 and the lens 32, and ensuring the printing effect.

[0125] In one possible implementation, in order to achieve a one-to-one fixed connection between each light source 20 and the lens 32, the light-curing 3D printing device also includes at least two brackets, one end of the bracket can be connected to the fixed seat 341, and each light source 20 is arranged at the other end of the bracket, and the light-emitting surface of the light source 20 faces the lens 32, so that the light source 20 and the lens 32 are fixedly connected one by one through the bracket.

[0126] In this example, the output shaft 331 of the rotary drive member 33 is connected to the center of the turntable 31 , and the output shaft 331 of the rotary drive member 33 drives the turntable 31 to rotate, and under the connection of the bracket, the light source 20 and the lens 32 rotate synchronously.

[0127] The print screen 50 has several areas of different sizes, such as area A, area B, and area C, wherein area A may include area B, and area B may include area C.

[0128] When the photocuring 3D printing device reads the placement position information of the model to be printed in the slice file, it will accordingly know which area on the printing screen 50 the placement position of the model to be printed corresponds to, for example, the area is area A. The processor generates a first control signal according to the placement position information of the model to be printed, and sends the generated first control signal to the rotating drive member 33 of the rotating component 34, so that the rotating drive member 33 drives the turntable 31 and the bracket to rotate.

[0129] In this embodiment, under the action of the rotating drive member 33, the turntable 31 drives the lens 32 to rotate to a position corresponding to the A area of ​​the printing screen 50, and the light source 20 also rotates to a position corresponding to the A area of ​​the printing screen 50, so that the positions of the selected light source 20 and the lens 32 correspond to each other, and exposure printing is performed. In this way, the model forming position can be closer to the central axis of the lens and the central axis of the light source, thereby improving the printing effect of the model, because the collimation of the light reaching the model forming position will be better.

[0130] It should be noted here that the numerical values ​​and numerical ranges involved in this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0131] In the description of the present invention, it should be understood that the terms used, such as “center”, “length”, “width”, “thickness”, “top”, “bottom”, “up”, “down”, “left”, “right”, “front”, “back”, “vertical”, “horizontal”, “inside”, “outside”, “axial”, “circumferential”, etc., to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or component referred to must have a specific direction, a specific structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0132] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0133] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or can communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, so that the internal communication of two elements or the interaction relationship between two elements can be achieved. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0134] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A light-curing 3D printing device, characterized in that: include: A material trough, the material trough is used to hold the material to be cured; A light source, the light source being arranged opposite to the material trough; A lens assembly, wherein the lens assembly is arranged between the light source and the material trough, the lens assembly includes a rotating assembly and at least two lenses arranged on the rotating assembly, the at least two lenses include a first lens and a second lens, the rotating assembly includes at least two fixed seats that can rotate relative to each other, the at least two fixed seats include a first fixed seat and a second fixed seat, the first fixed seat is fixedly connected to the first lens, the second fixed seat is fixedly connected to the second lens, and the refractive parameters of the at least two lenses are different.

2. The light-curing 3D printing device according to claim 1, characterized in that: It also includes a base, the number of the light source is one, the light source is fixedly arranged in the base, and the rotating assembly is configured to rotate relative to the base so that one of the at least two lenses is located on the light path between the light source and the material trough.

3. The light-curing 3D printing device according to claim 1, characterized in that: Also includes a base; The number of the light sources is at least two, each of the light sources is rotatably arranged in the base relative to each of the lenses, and the rotation center line of each of the light sources coincides with the rotation center line of each of the lenses; or, The number of the light sources is consistent with the number of the lenses, each of the lenses is located on the optical path between each of the light sources and the material trough, and the light sources are fixedly connected with the lenses in a one-to-one correspondence.

4. The light-curing 3D printing device according to claim 2, characterized in that: The rotating assembly comprises a rotating disk, the at least two fixing seats are connected to the rotating disk, and each of the fixing seats rotates around the center line of the rotating disk.

5. The light-curing 3D printing device according to claim 4, characterized in that: The rotating assembly further comprises a rotating driving member, wherein the rotating driving member is arranged in the base, and an output shaft of the rotating driving member is connected to the center position of the turntable.

6. The light-curing 3D printing device according to any one of claims 1 to 5, characterized in that: It also includes a light shielding member, which is arranged around the outer periphery of the light source, and a light-transmitting hole is opened on a side of the light shielding member facing the material trough; and / or, The photocuring 3D printing device also includes a processor, which is electrically connected to the rotating component. The processor is configured to read the placement position information of the model to be printed in the slice file of the three-dimensional model to generate a first control signal, and send the generated first control signal to the rotating component. The first control signal is used to instruct the rotating component to drive the lens and / or the light source to rotate.

7. The light-curing 3D printing device according to claim 4, characterized in that: At least two mounting holes are provided in the rotating disk, and the lenses are correspondingly arranged in the mounting holes, and the distances between the centers of the lenses and the center of the rotating disk are consistent.

8. The light-curing 3D printing device according to claim 4, characterized in that: An avoidance hole is provided in the fixing seat, and the lens comprises a lens body and a flange arranged at the edge of the lens body. The position of the lens body corresponds to the avoidance hole, and the flange extends between the fixing seat and the turntable.

9. The light-curing 3D printing device according to any one of claims 1 to 5, characterized in that: Also includes: A Fresnel lens and a printing screen, wherein the Fresnel lens is arranged between the lens assembly and the printing screen.

10. The light-curing 3D printing device according to claim 9, characterized in that: The distance L2 between the Fresnel lens and the light source and the focal length F of the Fresnel lens satisfy: 0.7≤F / L2≤1.3, and the distance L3 between the Fresnel lens and the printing screen satisfies: L3≤5mm; and / or, The diameter D of the light source satisfies: 1mm≤D≤20mm, and the light emitting angle θ of the light source is 5°≤θ≤45°; and / or, A side of the lens facing the light source is a first side, and a distance L1 is provided between the light source and the first side of the lens, wherein L1 satisfies L1≥1 mm.

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