A linear scanning photopolymerization 3D printer

Abstract

This invention relates to a linear scanning photopolymerization 3D printer, comprising: a single convex lens disposed on one side of a laser emitter capable of generating laser light; a beam modulator disposed on one side of the single convex lens; and a biconcave lens disposed on one side of the beam modulator. The invention utilizes an electric push rod to drive a first sliding part to move a second sliding part, which in turn moves the single convex lens and the beam modulator to a designated position in a two-stage linkage adjustment. This allows the single convex lens to expand the output laser beam once when it approaches the beam modulator, and to expand the laser beam a second time when the beam modulator approaches the diameter-changing part. Within a certain travel range, the beam diameter is expanded to the maximum extent possible. This results in a relatively short printing time for large-volume printing with fewer features, improving printing efficiency and functionality.

Description

Technical Field

[0001] This invention relates to the field of photopolymer 3D printer technology, and specifically to a linear scanning photopolymer 3D printer. Background Art

[0002] SLA, as an advanced additive manufacturing process, divides the CAD model into very thin cross-sections, with each layer having a thickness of 0.05mm. It is then processed using patented SLA molding and manufacturing equipment, which uses an ultraviolet laser beam to cure the photosensitive resin. One plane is completed at a time, and the graphic perspective of each layer is formed after scanning by a galvanometer. After the laser beam scans the resin plane, the liquid material is cured. After one layer is completed, the printing platform moves downward to make room for the next layer to be printed. A detector scans from above to ensure that the resin covers the surface evenly. At the same time, the laser continues to cure the new layer on the previous layer of material, and this cycle continues until the entire model is printed.

[0003] The principle of photopolymerization is to project a light source below the resin tank. A photopolymerization 3D printer, with patent number CN201510313921.8, is described. It includes a laser device comprising a laser, a galvanometer for adjusting the laser beam direction, and a reflector for reflecting the laser beam. The galvanometer includes a first galvanometer positioned longitudinally and a second galvanometer positioned laterally. The laser beam is directed laterally towards the first galvanometer. The reflector includes a first reflector positioned below the first and second galvanometers and a second reflector positioned below the material tray. The mirror surfaces of the first and second reflectors are opposite each other and form a 45-degree angle with the longitudinal axis. This patent has the following problems.

[0004] The diameter of the laser beam emitted by the laser cannot be changed. When printing large volumes with fewer features, a single-diameter beam takes a relatively long time and is not very efficient. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the technical problem that the wire diameter of the scanning forming wire bundle in the prior art of photopolymer 3D printers cannot be adjusted, and to provide a linear scanning photopolymer 3D printer.

[0006] The technical solution adopted by this invention to solve its technical problem is: a linear scanning photopolymerization 3D printer, comprising;

[0007] A single convex lens is disposed on one side of the laser emitter, and the laser emitter is capable of generating laser light;

[0008] A beam converter section is disposed on one side of the single convex lens;

[0009] A biconcave lens, wherein the biconcave lens is disposed on one side of the beam converter section;

[0010] The variable diameter section is disposed on one side of the biconcave lens, and the central axes of the variable diameter section, the biconcave lens, the beam converter section and the single convex lens are collinear. Both the biconcave lens and the variable diameter section are disposed on the support plate of the top layer inside the main body of the photopolymer 3D printer. The other side of the variable diameter section is disposed on the laser galvanometer group.

[0011] A first sliding part is disposed between the single convex lens and the support clamp;

[0012] A second sliding part is disposed between the transformer part and the support clamp;

[0013] An elastic connecting portion, wherein two elastic connecting portions are mirror-configured, and the elastic connecting portions are disposed between the first sliding portion and the second sliding portion;

[0014] An electric push rod, which is connected to the second sliding part via a connecting rod;

[0015] The laser beam from the laser emitter is sequentially expanded and refracted through the single convex lens, the beam converter, the biconcave lens, and the diameter-changing section before being reflected onto the printing plate by the laser galvanometer assembly.

[0016] The electric push rod is driven, and the second sliding part can drive the first sliding part to slide through the elastic connecting part, so that the beam expander part and the single convex lens move away from the laser emitter at the same time to expand the laser beam once.

[0017] When the second sliding part drives the first sliding part to slide, the first sliding part can be resisted and stretched by the elastic connecting part, so that the beam converter part moves away from the monoconvex lens and then expands the laser beam a second time.

[0018] Furthermore, the beam converter includes a first right arched convex mirror disposed on the second sliding part, a left arched convex mirror disposed on the first right arched convex mirror, and a double arched convex mirror;

[0019] The double-arched convex mirror is located to the right of the left arched convex mirror.

[0020] Furthermore, the variable diameter section includes a second right-hand convex mirror disposed on the top layer of the support clamp inside the main body of the photopolymer 3D printer, and a third right-hand convex mirror integrally disposed on the second right-hand convex mirror.

[0021] Furthermore, the second sliding part includes two first slide rails mirror-distributed on both sides of the first right arch convex mirror, and two first sliding rods slidably disposed at the bottom ends of the two first slide rails;

[0022] The two first sliding rods are disposed on the top support plate inside the main body of the photopolymer 3D printer, wherein

[0023] The first right arch convex mirror is adapted to slide along the two first sliding rods via the two first slide rails.

[0024] Furthermore, the first sliding part includes two fixed rods mirror-distributed on both sides of the single convex lens, two second slide rails vertically disposed on the two fixed rods, and two second sliding rods slidably disposed at the bottom ends of the two second slide rails;

[0025] Two second sliding rods are disposed on the top support plate inside the main body of the photopolymer 3D printer, wherein

[0026] The monoconvex lens is adapted to slide along the two second sliding rods via the two second slide rails.

[0027] Furthermore, the first sliding part also includes two blocking blocks integrally disposed on the two second sliding rods, wherein

[0028] The two blocking blocks can prevent the two second slide rails from sliding.

[0029] Furthermore, the elastic connection includes two connecting rods disposed inside the two second slide rails and two springs disposed on the two connecting rods;

[0030] The other ends of the two springs are connected to one end of the two first slide rails, wherein

[0031] When the two blocking blocks prevent the two second slide rails from sliding, the two springs can be stretched.

[0032] Furthermore, the elastic connection portion also includes a groove disposed on the outer side of each of the first slide rails, and an elastic rod disposed on one side of each of the second slide rails;

[0033] The two elastic rods are respectively inserted into the two grooves and abut against one side of the two grooves.

[0034] Furthermore, the lower half of one side of the elastic rod is arc-shaped, and the lower end of the elastic rod does not contact the bottom end of the groove.

[0035] The beneficial effects of this invention are that, through the driving operation of the electric push rod, the first sliding part drives the second sliding part to respectively drive the monoconvex lens and the beam converter to adjust in a two-stage linkage at a designated position. When the monoconvex lens approaches the beam converter, the output laser beam is expanded once, and when the beam converter approaches the diameter-changing part, the laser beam is expanded a second time. Within a certain stroke, the diameter of the laser beam is expanded to the maximum extent. When performing large-volume printing work with fewer features, the time is relatively short, improving the efficiency and functionality of the printing work. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Figure 1 This is an external perspective view of a preferred embodiment of the present invention;

[0038] Figure 2 This is a top view of the interior of a preferred embodiment of the present invention;

[0039] Figure 3 This is a diagram showing the laser beam adjustment state of the present invention.

[0040] Figure 4 This is a diagram showing the secondary adjustment state of the laser beam according to the present invention;

[0041] Figure 5 This is the invention Figure 2 Enlarged view of point A in the middle;

[0042] Figure 6 This is a diagram showing the internal state of the second slide rail connecting to the first slide rail according to the present invention;

[0043] Figure 7 This is the invention Figure 6 Enlarged view of section B in the middle.

[0044] In the picture:

[0045] 1. A single convex lens;

[0046] 2. Laser emitter;

[0047] 3. Beam converter section; 31. First right arched convex lens; 32. Left arched convex lens; 33. Double arched convex lens;

[0048] 4. Biconcave lens;

[0049] 5. Variable diameter section; 51. Second right right convex lens; 52. Third right convex lens;

[0050] 6. First sliding part; 61. Fixed rod; 62. Second slide rail; 63. Second sliding rod; 64. Blocking block;

[0051] 7. Second sliding part; 71. First slide rail; 72. First sliding rod;

[0052] 8. Flexible connecting part; 81. Connecting rod; 82. Spring; 83. Groove; 84. Elastic rod;

[0053] 9. Electric linear actuator;

[0054] 10. Main body of the photopolymer 3D printer;

[0055] 11. Laser galvanometer assembly. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0057] like Figure 1 As shown, Figure 1 This is an external perspective view of a preferred embodiment of the present invention; as shown below. Figure 2 As shown, Figure 2 This is a top view of the interior of a preferred embodiment of the present invention; as shown... Figure 3 As shown, Figure 3 This is a diagram showing the laser beam adjustment state of the present invention; as shown. Figure 4 As shown, Figure 4 This is a diagram showing the secondary adjustment state of the laser beam according to the present invention; as shown. Figure 5 As shown, Figure 5 This is the invention Figure 2 Enlarged view of point A in the middle; as shown Figure 6 As shown, Figure 6 This is a diagram showing the internal state of the second slide rail connecting to the first slide rail according to the present invention; as shown. Figure 7 As shown, Figure 7 This is the invention Figure 6 Enlarged view at point B, as shown Figure 1-7 As shown, the present invention provides a linear scanning photopolymerization 3D printer, comprising:

[0058] A single convex lens 1 is disposed on one side of the laser emitter 2, and the laser emitter 2 is capable of generating laser light; the direction of the single convex lens 1 toward the laser emitter 2 is a plane, and the direction of the single convex lens 1 away from the laser emitter 2 is a convex surface, and the laser light diffuses during the horizontal refraction process through the single convex lens 1.

[0059] Beam converter 3 is disposed on one side of the single convex lens 1. When the diffused laser passes through the beam converter 3, it is focused towards the double concave lens 4 to achieve a correction effect.

[0060] A biconcave lens 4 is disposed on one side of the beam converter section 3;

[0061] The variable diameter section 5 is disposed on one side of the biconcave lens 4, and the central axes of the variable diameter section 5, the biconcave lens 4, the beam converter section 3 and the single convex lens 1 are collinear. Both the biconcave lens 4 and the variable diameter section 5 are disposed on the support plate of the top layer inside the photopolymer 3D printer body 10. The other side of the variable diameter section 5 is disposed on the laser galvanometer group 11. The variable diameter section 5 will eventually diffuse the laser beam passing through it and guide it to be emitted in a horizontal trajectory. During this stage, the output laser beam becomes thicker and the output trajectory does not change.

[0062] A first sliding part 6 is disposed between the single convex lens 1 and the support clamp;

[0063] The second sliding part 7 is disposed between the beam converter part 3 and the support clamp; the first sliding part 6 and the second sliding part 7 can drive the single convex lens 1 and the beam converter part 3 to move, thereby increasing the line diameter of the right end of the conical segmented laser beam between the single convex lens 1 and the beam converter part 3, so as to achieve the adjustment effect.

[0064] The elastic connecting part 8 is configured as two mirror images and is disposed between the first sliding part 6 and the second sliding part 7. The elastic connecting part 8 allows the first sliding part 6 and the second sliding part 7 to move synchronously, and also allows the second sliding part 7 to continue to extend after the first sliding part 6 reaches a designated position, so that the change of laser wire diameter has a two-stage adjustment function.

[0065] The electric push rod 9 is a general-purpose device, and its model is not limited here. The electric push rod 9 is connected to the second sliding part 7 through a connecting rod. The electric push rod 9 can drive the first sliding part 6 and the second sliding part 7 to reciprocate and be temporarily fixed in the moving position.

[0066] The laser emitted by the laser emitter 2 is expanded and refracted sequentially through the single convex lens 1, the beam converter 3, the biconcave lens 4, and the diameter-changing part 5 before being reflected onto the laser galvanometer assembly 11 and then onto the printing plate. The printing plate is located in a resin solution tank. The laser galvanometer assembly 11 is a device used in existing photopolymerization printing processes, which has the function of changing the laser's landing point after reflecting the beam; this will not be described in detail here. The laser emitter 2 and the electric actuator 9 can be electrically connected via wires to a controller located inside the main body 10 of the photopolymerization 3D printer. This allows the laser emitter 2 to maintain a consistent laser output intensity when the electric actuator 9 drives the laser wire diameter to change.

[0067] Drive the electric push rod 9, and the second sliding part 7 can drive the first sliding part 6 to slide through the elastic connection part 8, so that the beam expander part 3 and the single convex lens 1 move away from the laser emitter 2 at the same time to expand the laser beam once.

[0068] When the second sliding part 7 drives the first sliding part 6 to slide, the first sliding part 6 can be resisted and stretched by the elastic connecting part 8, so that the beam converter part 3 moves away from the single convex lens 1 and then expands the laser beam a second time. This is the Galilean beam expansion principle.

[0069] Specifically, the present invention uses the electric push rod 9 to drive the first sliding part 6 to drive the second sliding part 7 to respectively drive the single convex lens 1 and the beam converter part 3 to adjust in two stages at a designated position. When the single convex lens 1 approaches the beam converter part 3, it expands the output laser beam once, and when the beam converter part 3 approaches the diameter-changing part 5, it expands the laser beam a second time. Within a certain stroke, the diameter of the laser beam is expanded to the maximum extent. When performing large-volume printing work with fewer features, the time is relatively short, improving the efficiency and functionality of the printing work.

[0070] Optionally, the beam converter 3 includes a first right arched convex mirror 31 disposed on the second sliding part 7, a left arched convex mirror 32 disposed on the first right arched convex mirror 31, and a double arched convex mirror 33 disposed on the first right arched convex mirror 31.

[0071] The double-arched convex mirror 33 is located to the right of the left arched convex mirror 32. Specifically, the left side of the first right arched convex mirror 31 is concave and the right side is convex, the left side of the left arched convex mirror 32 is convex and the right side is concave, and both sides of the double-arched convex mirror 33 are convex. The laser beam expanded by the right side of the single convex lens 1 is horizontal when it passes through the first right arched convex mirror 31 and the left arched convex mirror 32, then converges when it passes through the double-arched convex mirror 33, and finally diffuses again when it passes through the double concave lens 4. During this process, the beam is adjusted multiple times to become more stable.

[0072] Optionally, the variable diameter section 5 includes a second right arched convex mirror 51 disposed on the support clamp plate inside the top layer of the photopolymer 3D printer body 10, and a third right arched convex mirror 52 integrally disposed on the second right arched convex mirror 51. Specifically, the second right arched convex mirror 51 is concave on the left and convex on the right, and the third right arched convex mirror 52 is concave on the left and convex on the right. The diffused laser beam passes through the second right arched convex mirror 51 and the third right arched convex mirror 52 in sequence, and finally refracts horizontally toward the laser galvanometer group 11. At this time, the diameter of the refracted beam of the third right arched convex mirror 52 is the final diameter of the printing work.

[0073] Optionally, the second sliding part 7 includes two first slide rails 71 mirror-distributed on both sides of the first right arch convex mirror 31, and two first sliding rods 72 slidably disposed at the bottom ends of the two first slide rails 71;

[0074] Two first sliding rods 72 are disposed on the support clamp plate on the top layer inside the photopolymer 3D printer body 10, wherein

[0075] The first right arch convex mirror 31 is adapted to slide along the two first sliding rods 72 via the two first slide rails 71. Specifically, the movement of the beam converter 3 can be limited by the action of the two first slide rails 71 on the two first sliding rods 72, so that the transmission trajectory of the laser beam will not change with the position adjustment of the beam converter 3, thus ensuring the safety of the laser beam adjustment operation.

[0076] Optionally, the first sliding part 6 includes two fixed rods 61 mirror-distributed on both sides of the single convex lens 1, two second slide rails 62 vertically disposed on the two fixed rods 61, and two second sliding rods 63 slidably disposed at the bottom of the two second slide rails 62.

[0077] Two second sliding rods 63 are disposed on the support clamp plate at the top layer inside the photopolymer 3D printer body 10, wherein

[0078] The single convex lens 1 is adapted to slide along the two second sliding rods 63 via the two second slide rails 62. Specifically, the movement of the single convex lens 1 can be limited by the action of the two second slide rails 62 on the two second sliding rods 63, maintaining the same movement state as the beam converter 3, thereby increasing the limiting and protective effect when the single convex lens 1 moves.

[0079] Optionally, the first sliding part 6 further includes two blocking blocks 64 integrally disposed on the two second sliding rods 63, wherein

[0080] The two blocking blocks 64 can prevent the two second slide rails 62 from sliding. Specifically,

[0081] The size of the blocking block 64 is larger than the size of the second sliding rod 63, so that the second slide rail 62 is blocked when it moves along the second sliding rod 63 to a certain trajectory. Under this premise, the first slide rail 71 no longer drives the second slide rail 62 and moves independently, so that the secondary stroke of the laser beam adjustment work is guaranteed.

[0082] Optionally, the elastic connection part 8 includes two connecting rods 81 disposed inside the two second slide rails 62 and two springs 82 disposed on the two connecting rods 81;

[0083] The other ends of the two springs 82 are connected to one end of the two first slide rails 71, wherein

[0084] When the two blocking blocks 64 prevent the two second slide rails 62 from sliding, the two springs 82 can be stretched. Specifically, when the first slide rail 71 moves alone, the spring will be stretched. When the electric push rod 9 drives the first slide rail 71 to reset, the first slide rail 71 can push the second slide rail 62 through the spring 82 and the connecting rod 81, so that the second slide rail 62 can be reset smoothly and accurately. The spring 82 is elastic and can slow down the reset operation of the second slide rail 62 during the process.

[0085] Optionally, the elastic connection part 8 further includes a groove 83 disposed on the outside of each of the first slide rails 71, and an elastic rod 84 disposed on one side of each of the second slide rails 62.

[0086] The two elastic rods 84 are respectively inserted into the two grooves 83 and abut against one side of the two grooves 83. Specifically, the elastic rods 84 have elasticity and rigidity. When they are in the grooves 83, they can ensure the synchronicity of the movement of the first slide rail 71 and the second slide rail 62. When the movement of the second slide rail 62 is obstructed, the force of the first slide rail 71 driving the movement of the groove 83 is too large. At this time, the elastic rods 84 are deformed by the force and disengage from the grooves 83, so that the synchronous movement of the first slide rail 71 and the second slide rail 62 and the individual movement can be switched flexibly.

[0087] Optionally, the lower half of one side of the elastic rod 84 is arc-shaped, and the lower end of the elastic rod 84 does not contact the bottom end of the groove 83. Specifically, the shape of the elastic rod 84 can reduce the friction between it and the edge of the groove 83 during the process of it separating from the groove 83, expand the friction angle and friction surface between the elastic rod 84 and the groove 83, and avoid the elastic rod 84 and the groove 83 being worn and shortened in the process of repeated use.

[0088] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A linear scanning photopolymerization 3D printer, characterized in that, include; A single convex lens (1) is disposed on one side of a laser emitter (2), and the laser emitter (2) is capable of generating laser light; A beam converter section (3) is provided on one side of the single convex lens (1); A biconcave lens (4) is disposed on one side of the beam converter section (3); The variable diameter part (5) is disposed on one side of the biconcave lens (4), and the central axes of the variable diameter part (5), the biconcave lens (4), the beam converter part (3) and the single convex lens (1) are collinear. The biconcave lens (4) and the variable diameter part (5) are both disposed on the support plate of the top layer inside the photopolymerization 3D printer body (10). The other side of the variable diameter part (5) is disposed on the laser galvanometer group (11). The first sliding part (6) is disposed between the single convex lens (1) and the support clamp; The second sliding part (7) is disposed between the transformer part (3) and the support clamp; The elastic connecting part (8) is configured as two mirror images, and the elastic connecting part (8) is disposed between the first sliding part (6) and the second sliding part (7); An electric push rod (9) is connected to the second sliding part (7) via a connecting rod; The laser emitted by the laser emitter (2) can be expanded and refracted sequentially through the single convex lens (1), the beam converter (3), the biconcave lens (4), and the diameter-changing part (5) to the laser galvanometer group (11) and then reflected to the printing plate. Drive the electric push rod (9), and the second sliding part (7) can drive the first sliding part (6) to slide through the elastic connection part (8) so that the beam expander part (3) and the single convex lens (1) move away from the laser emitter (2) at the same time; When the second sliding part (7) drives the first sliding part (6) to slide, the first sliding part (6) can be blocked and stretched by the elastic connecting part (8) so that the beam converter part (3) moves away from the single convex lens (1) and then expands the laser beam for a second time. The beam converter (3) includes a first right arch convex mirror (31) disposed on the second sliding part (7), a left arch convex mirror (32) disposed on the first right arch convex mirror (31), and a double arch convex mirror (33). The double-arched convex mirror (33) is located to the right of the left arched convex mirror (32); The variable diameter section (5) includes a second right arch convex mirror (51) disposed on the top support plate inside the main body (10) of the photopolymer 3D printer and a third right arch convex mirror (52) integrally disposed on the second right arch convex mirror (51). The second sliding part (7) includes two first slide rails (71) mirror-displayed on both sides of the first right arch convex mirror (31), and two first sliding rods (72) slidably disposed at the bottom of the two first slide rails (71). The two first sliding rods (72) are disposed on the top support plate inside the main body (10) of the photopolymer 3D printer, wherein The first right arch convex mirror (31) is adapted to slide along the two first sliding rods (72) via the two first slide rails (71); The first sliding part (6) includes two fixed rods (61) mirror-displayed on both sides of the single convex lens (1), two second slide rails (62) vertically disposed on the two fixed rods (61), and two second sliding rods (63) slidably disposed at the bottom of the two second slide rails (62). Two second sliding rods (63) are disposed on the top support plate inside the main body (10) of the photopolymer 3D printer, wherein The single convex lens (1) is adapted to slide along the two second sliding rods (63) via the two second slide rails (62); The first sliding part (6) further includes two blocking blocks (64) integrally disposed on the two second sliding rods (63), wherein The two blocking blocks (64) can prevent the two second slide rails (62) from sliding; The elastic connection part (8) includes two connecting rods (81) disposed inside the two second slide rails (62) and two springs (82) disposed on the two connecting rods (81). The other end of the two springs (82) is connected to one end of the two first slide rails (71), wherein When the two blocking blocks (64) prevent the two second slide rails (62) from sliding, the two springs (82) can be stretched; The elastic connection part (8) further includes a groove (83) provided on the outside of each of the first slide rails (71) and an elastic rod (84) provided on one side of each of the second slide rails (62). The two elastic rods (84) are respectively inserted into the two grooves (83) and abut against one side of the two grooves (83).

2. The linear scanning photopolymerization 3D printer as described in claim 1, characterized in that, The lower half of one side of the elastic rod (84) is arc-shaped, and the lower end of the elastic rod (84) does not contact the bottom end of the groove (83).

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