Photocurable 3D printing platform and printing method

Abstract

The application discloses a light-curing 3D printing platform and a printing method. The light-curing 3D printing platform comprises a forming platform, an intermediate adapter plate, a plurality of leveling mechanisms arranged above the intermediate adapter plate, a plurality of buffer mechanisms, and a plurality of guiding columns. The intermediate adapter plate is driven to move linearly in a vertical direction. The leveling mechanisms comprise an inclined surface block, an inclined surface positioning block in abutment with the side of the inclined surface block, and the guiding columns fixed above the intermediate adapter plate. One end of the buffer mechanism is in abutment with the side of the inclined surface positioning block, and the other end of the buffer mechanism penetrates through the intermediate adapter plate and is fixedly connected with the forming platform. The application provides spring buffering for the forming platform during pulling up and down, prevents the pulling force of a release film generated during printing from directly acting on a printing model, and avoids the model from falling off.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of 3D printing, and particularly relates to a light-curing 3D printing platform and a printing method. BACKGROUND

[0002] The stereolithography process is a kind of 3D printing technology widely used in modern science and technology, which uses an LCD (Liquid Crystal Display) liquid crystal screen as a mask and utilizes UV (Ultraviolet) as a light source to cure resin through the pattern displayed by the LCD liquid crystal screen. The forming platform needs to be lowered to the bottom of the trough containing the light-curing resin, and the UV light source is arranged below the trough. A printing screen is arranged at the intermediate position above the light source and below the trough to display the pattern of each layer of the model. The light-curing resin is scanned according to the contour track of the cross section of the part to be processed under the irradiation of the UV light, to generate a photopolymerization reaction, thereby forming multiple thin cross sections stacked layer by layer, and then obtaining a complete part model.

[0003] The forming platform used at present needs to remove the cured resin layer by layer from the trough by pulling up during the forming process. The conventional forming platform is in a rigid state after leveling, without a downward buffering structure. When printing a large cross-section model, the model itself will be subjected to the entire downward pulling force of the release film. If the first layer of the model is not firmly bonded to the forming platform, the model will be easily pulled off the plate, resulting in printing failure. Therefore, how to provide buffering for the forming platform during repeated pulling up and down of the model to avoid model plate falling is a problem to be solved. SUMMARY

[0004] The application provides a light-curing 3D printing platform and a printing method to solve the problem of how to provide buffering for the forming platform during repeated pulling up and down of the model to avoid model plate falling.

[0005] In order to solve the above technical problems, the application provides a light-curing 3D printing platform, which comprises:

[0006] a forming platform;

[0007] an intermediate adapter plate arranged above the forming platform, the intermediate adapter plate being driven to drive the forming platform to move linearly in the vertical direction;

[0008] Several leveling mechanisms are disposed above the intermediate transition plate. Each leveling mechanism includes an inclined block, an inclined positioning block that abuts against the side of the inclined block, and a guide post block fixedly disposed above the intermediate transition plate. A first locking member is disposed through the upper part of the inclined block, and the first locking member passes vertically through the inclined block and the intermediate transition plate under the support of the inclined block. A first guide post is disposed on the side of the guide post block near the inclined positioning block. A limiting groove is disposed in the inclined positioning block to allow the first guide post to move horizontally, so that the inclined positioning block moves horizontally in a direction away from or close to the inclined block under the guidance of the first guide post.

[0009] Several elastically supported buffer mechanisms are provided between the inclined positioning block and the forming platform. One end of the buffer mechanism abuts against the side of the inclined positioning block, and the other end of the buffer mechanism passes through the intermediate adapter plate and is fixedly connected to the forming platform.

[0010] As a further improvement of this application, a first locking slope is provided on the side of the inclined positioning block near the inclined block, and the side of the inclined block abuts against the inclined positioning block through the first locking slope;

[0011] The inclined positioning block is provided with a second locking inclined surface on the side near the guide post block, and one end of the buffer mechanism abuts against the inclined positioning block through the second locking inclined surface.

[0012] As a further improvement of this application, the inclined positioning block is provided with a third locking plane in the vertical direction on the side near the first guide post. One end of the first guide post is threaded to the side wall of the guide post block, and the other end of the first guide post is an optical axis. The optical axis passes through the third locking plane and slides but does not disengage from the limiting groove, so that the inclined positioning block presses against the first guide post in the limiting groove under the action of the inclined block, or moves away from and releases the first guide post in the limiting groove.

[0013] As a further improvement of this application, the inclined positioning block is provided with a fourth locking plane in the horizontal direction on the side near the intermediate adapter plate. The fourth locking plane is arranged in parallel contact with the top of the inclined positioning block. When the first locking member locks the inclined block downward or releases it upward, the inclined positioning block moves horizontally on the top of the intermediate adapter plate through the fourth locking plane.

[0014] As a further improvement of this application, the buffer mechanism includes a double-ended bolt that passes through the intermediate adapter plate and the forming platform. The intermediate adapter plate is provided with a countersunk hole for the buffer mechanism to pass through. One end of the double-ended bolt abuts against the second locking inclined surface, and the other end of the double-ended bolt passes through the countersunk hole and is threadedly connected to the forming platform.

[0015] The double-ended bolt is provided with an anti-loosening nut and a buffer spring at one end near the second locking bevel. The buffer spring is sleeved around the outer wall of the double-ended bolt, and the buffer spring is limited between the countersunk hole and the bottom of the anti-loosening nut by the anti-loosening nut.

[0016] As a further improvement of this application, a plurality of second guide posts are provided between the molding platform and the intermediate transition plate. The bottom of the intermediate transition plate is provided with a guide groove for the second guide posts to move up and down. One end of the second guide post is fixedly connected to the top of the molding platform, and the other end of the second guide post is slidably connected to the corresponding guide groove but not detached from the guide groove.

[0017] As a further improvement of this application, the number of the leveling mechanisms is four, and the four leveling mechanisms are distributed in a rectangular shape and are respectively set at the top four corners of the intermediate transition plate.

[0018] The number of buffer mechanisms is four, and the four buffer mechanisms are set on the second locking slope of the four leveling mechanism slope positioning blocks.

[0019] As a further improvement of this application, the first locking member is a first adjusting bolt, which can be adjusted to lock the inclined block downward or loosen it upward.

[0020] As a further improvement of this application, the top of the intermediate transition plate is also provided with an assembly seat connected to the lifting mechanism, the lifting mechanism being used to drive the intermediate transition plate to move linearly in a direction away from or close to the forming platform.

[0021] The bottom two sides of the assembly base are provided with "n"-shaped assembly adapter plates. The top of the assembly adapter plates is fixedly connected to the bottom two sides of the assembly base by a first fixing bolt. The bottom of the assembly adapter plates is provided with an extension, and the assembly adapter plates are fixed to the top of the intermediate adapter plate by a second fixing bolt provided on the extension.

[0022] As a further improvement of this application, a second locking member is provided on the top of the mounting base. The second locking member is a second adjusting bolt. The vertical position adjustment of the intermediate adapter plate and the forming platform can be achieved by adjusting the second adjusting bolt.

[0023] Based on the aforementioned photopolymer 3D printing platform, this application also provides a photopolymer 3D printing method, applied to any of the aforementioned photopolymer 3D printing platforms, the method comprising the following steps:

[0024] Move the forming platform downwards until its bottom surface contacts the top surface of the printing screen;

[0025] Level the forming platform, tighten the first locking component to drive the inclined block downward, the inclined positioning block to the right, the double-headed bolt and the forming platform downward until the lower plane of the forming platform is parallel to and in contact with the upper plane of the printing screen;

[0026] Pull the mold that has been photocured and attached to the bottom of the molding platform in the material tank upwards. The buffer spring will return to its original shape, which will drive the double-headed bolt and the molding platform back to the leveling position.

[0027] Control the molding platform to repeatedly pull up and down until the model is printed.

[0028] Compared with the prior art, the photopolymerization 3D printing platform and printing method provided in this application embodiment provide spring buffering for the repeated up-and-down pulling process of the model during printing by setting a leveling mechanism above the molding platform and a buffer mechanism between the leveling mechanism and the molding platform; by tightening the first locking member, the pressure generated by tightening downwards can be transmitted through the inclined block and the inclined positioning block, which in turn drives the double-headed bolt and the molding platform to move downwards; during the repeated up-and-down pulling process of the molding platform, the pulling force of the release film is transmitted to the spring through the buffer spring, providing buffering for the molding platform and the model attached below the molding platform, preventing the release film pulling force generated during the printing process from acting directly on the printed model, avoiding the model from falling off the plate, thereby improving the printing success rate. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a photopolymerization 3D printing platform provided in an embodiment of this application;

[0031] Figure 2 This is a front view of a photopolymerization 3D printing platform provided in an embodiment of this application;

[0032] Figure 3This is a cross-sectional view along the front view of a photopolymerization 3D printing platform provided in an embodiment of this application;

[0033] Figure 4 This is a three-dimensional assembly drawing of a photopolymerization 3D printing platform provided in an embodiment of this application;

[0034] Figure 5 This is a left view of a photopolymerization 3D printing platform provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the inclined positioning block in a photopolymerization 3D printing platform provided in an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the structure for leveling a photopolymer 3D printing platform in existing technology;

[0037] Figure 8 This is a flowchart of a photopolymerization 3D printing method provided in an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10 - Molding platform;

[0040] 20 - Intermediate adapter plate; 21 - Countersunk hole; 22 - Second guide post; 23 - Guide groove;

[0041] 30-Leveling mechanism; 31-Ceiling block; 32-Ceiling positioning block; 321-First locking sloping surface; 322-Second locking sloping surface; 323-Limiting groove; 324-Third locking plane; 325-Fourth locking plane; 33-Guide post block; 34-First locking element; 35-First guide post;

[0042] 40 - Buffer mechanism; 41 - Double-ended bolt; 42 - Anti-loosening nut; 43 - Buffer spring;

[0043] 50 - Assembly base; 51 - Assembly adapter plate; 511 - Extension; 52 - First fixing bolt; 53 - Second fixing bolt; 54 - Second locking element. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0045] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0046] To make the description of this disclosure more detailed and complete, illustrative descriptions of the implementation methods and specific embodiments of this application are provided below; however, this is not the only form of implementing or utilizing the specific embodiments of this application. The implementation methods cover the features of multiple specific embodiments and the method steps and their order for constructing and operating these specific embodiments. However, other specific embodiments may also be used to achieve the same or equivalent functions and step sequences.

[0047] Please refer to Figures 1-7 To address the issue of providing cushioning for the molding platform during repeated pulling of the model in existing technologies, thus preventing the model from falling off, this application provides a photopolymerization 3D printing platform. Please refer to... Figure 1 This is a schematic diagram of the structure of a photopolymer 3D printing platform provided in an embodiment of this application. The photopolymer 3D printing platform includes a molding platform 10, an intermediate adapter plate 20 disposed above the molding platform 10, a plurality of leveling mechanisms 30 disposed above the intermediate adapter plate 20, and a plurality of buffer mechanisms 40 elastically supported between the leveling mechanisms 30 and the molding platform 10.

[0048] A typical photopolymer 3D printer includes a machine base, a material tank on the machine base, a printing platform, and a lifting mechanism that drives the molding platform to move up and down. The molding platform 10 is used to descend into the material tank containing photopolymer resin. The photopolymer resin in the material tank gradually cures under the irradiation of an ultraviolet light source and adheres to the bottom of the molding platform. The lifting mechanism is used to lower the molding platform 10 into the material tank and pull the model, which has been photopolymerized and adhered to the bottom of the molding platform 10, upwards. Because the lower surface of the molding platform 10 is sandblasted, its surface roughness is relatively high. The adhesion between the cured resin layer of the model and the molding platform 10 is greater than the adhesion between the cured resin layer of the model and the release film. Therefore, when the molding platform 10 is pulled up, the cured resin layer adheres to the molding platform 10 while simultaneously peeling off the release film. However, in practical applications, during the repeated up-and-down pulling process of the molding platform 10, the release film will exert a downward pulling force on the cured resin layer of the model. If the first layer of the model is not firmly bonded to the bottom surface of the molding platform 10, the model can easily be pulled off the board, resulting in printing failure. Therefore, this application provides an intermediate transition plate 20 above the molding platform 10, several leveling mechanisms 30 above the intermediate transition plate 20, and several buffer mechanisms 40 between the leveling mechanisms 30 and the molding platform 10 to solve the above problems.

[0049] For details, please continue to refer to... Figure 1 In this embodiment, the intermediate adapter plate 20 is positioned above the forming platform 10. The intermediate adapter plate 20 can be driven to make the forming platform 10 move in a straight line in the vertical direction. In a specific embodiment provided in this application, the intermediate adapter plate 20 is connected to a lifting mechanism. The lifting mechanism is used to make the intermediate adapter plate 20 and the forming platform 10 move in a straight line in the direction away from or close to the material trough. Since the intermediate adapter plate 20 is positioned above the forming platform 10 and is connected to the forming platform 10 through a number of second guide columns 22, the intermediate adapter plate 20 can be driven by the lifting mechanism to further make the forming platform 10 move in a straight line in the vertical direction.

[0050] It is understandable that any other lifting mechanism or other configuration can be used as long as the intermediate transfer plate 20 can drive the molding platform 10 to move away from or towards the bottom material trough, and is not limited to the above description.

[0051] As an optional implementation, before actual printing, the forming platform 10 needs to move downwards until its bottom contacts the printing screen, and it is necessary to ensure that the bottom of the forming platform 10 remains parallel to the upper surface of the printing screen at its bottom; please refer to Figure 7This diagram illustrates the existing technology for leveling a photopolymer 3D printing platform. It shows that leveling in the prior art involves tightening four screws on the left and right sides of the mounting adapter plate. However, after leveling, the platform is rigid, and the release film pull-out force between the cured resin layer and the release film is entirely applied to the printed model. Excessive pull-out force can easily cause the model to fall off, leading to printing failure. Therefore, this application eliminates the method of leveling by tightening the side screws and instead uses several leveling mechanisms 30 above the intermediate adapter plate 20. This not only adjusts the level of the platform 10 before printing but also, in conjunction with the buffer mechanism 40, provides cushioning during repeated up-and-down pulling, maintaining the platform 10 in a leveled position after upward stretching. This transmits the release film pull-out force to the buffer mechanism 40, reducing the probability of the model falling off and thus improving the subsequent model forming quality.

[0052] For details, please refer to Figure 2 This is a front view of a photopolymerization 3D printing platform provided in an embodiment of this application. The leveling mechanism 30 includes an inclined block 31, an inclined positioning block 32, and a guide column block 33 fixedly disposed above the intermediate transition plate 20. A first locking member 34 is disposed through the upper part of the inclined block 31. The bottom of the inclined block 31 is parallel to the top of the intermediate transition plate 20 and maintains a certain gap. The first locking member 34, supported by the inclined block 31, vertically passes through the inclined block 31 and the intermediate transition plate 20, thereby locking the inclined block 31 downwards or releasing it upwards. In a specific embodiment provided in this application, the first locking member 34 is preferably configured as an adjusting bolt, which is used to lock the corresponding lower inclined block 31 downwards or release it upwards.

[0053] Further, please refer to Figure 6 This is a schematic diagram of the structure of a sloped positioning block 32 in a photopolymerization 3D printing platform provided in this application embodiment. The sloped positioning block 32 is disposed between the sloped block 31 and the guide column block 33. A first locking slope 321 is provided on the side of the sloped positioning block 32 close to the sloped block 31, so that the side of the sloped block 31 abuts against the sloped positioning block 32 through the first locking slope 321.

[0054] In one specific embodiment provided in this application, the inclined positioning block 32 is provided with an upwardly inclined first locking inclined surface 321 on the side close to the inclined block 31. The side of the inclined block 31 close to the inclined positioning block 32 is preferably set as an inclined surface parallel to the first locking inclined surface 321. Of course, it can also be set as other inclined angles. As long as it can achieve the first locking inclined surface 321 close to the inclined positioning block 32, the downward locking pressure or upward loosening pull of the first adjusting bolt on the inclined block 31 can be transmitted to the inclined positioning block 32. Other contact surface forms are also feasible.

[0055] In one specific embodiment provided in this application, in order to cooperate with the first locking member 34 that penetrates vertically through the top, the intermediate transition plate 20 that is parallel to the bottom, and the first locking inclined surface 321 that contacts the side, it is preferable to set the inclined surface block 31 as a structure with an isosceles trapezoidal cross section. Of course, the above is only a preferred specific implementation and is not intended as a further limitation on the inclined surface block 31 provided in this application.

[0056] As an optional implementation, the guide post block 33 is fixed above the intermediate transition plate 20 and extends upward, together with the inclined block 31 to limit the inclined positioning block 32 between the inclined block 31 and the guide post block 33. The inclined positioning block 32 is provided with a second locking inclined surface 322 on the side near the guide post block 33, so that one end of the buffer mechanism 40 abuts against the inclined positioning block 32 through the second locking inclined surface 322.

[0057] In one specific embodiment provided in this application, the inclined positioning block 32 is provided with an upwardly inclined second locking inclined surface 322 on the side near the guide post block 33, to cooperate with the upwardly inclined first locking inclined surface 321. Of course, the first locking inclined surface 321 and the second locking inclined surface 322 can also be set in opposite directions of inclination. This application does not further limit the degree of inclination of the second locking inclined surface 322 and the first locking inclined surface 321. As long as the first locking inclined surface 321 and the second locking inclined surface 322 of the inclined positioning block 32 form two inclined surface features at a certain angle with the intermediate transition plate 20, it is feasible.

[0058] Further, please refer to Figure 3 The cross-sectional view along the main view of the photopolymerization 3D printing platform provided in this application embodiment shows that the guide block 33 is provided with a first guide post 35 extending in the horizontal direction on the side near the inclined positioning block 32. The inclined positioning block 32 is provided with a limiting groove 323 at the position corresponding to the first guide post 35, which allows the first guide post 35 to move horizontally. This limits the inclined positioning block 32 to move horizontally along the direction of the first guide post 35, that is, the inclined positioning block 32 moves in the direction away from or close to the guide block 33 under the guidance of the first guide post 35.

[0059] Considering that the side wall of the guide post block 33 is flat and the side wall of the inclined positioning block 32 is inclined, there may be insufficient contact when the inclined positioning block 32 moves towards the guide post block 33 under the guidance of the first guide post 35. Therefore, this application also provides a vertical third locking plane 324 on the side of the inclined positioning block 32 near the first guide post 35. The third locking plane 324 is parallel to the side wall of the first guide post 35. The limiting slide groove 323 is further adjusted to the position of the third locking plane 324 and extended towards the inclined block 31, so that the first guide post 35 slides and engages with the inside of the limiting slide groove 323 after passing through the third locking plane 324. In principle, it is necessary to satisfy that the end of the first guide post 35 slides inside the limiting slide groove 323 but does not disengage from the limiting slide groove 323.

[0060] Furthermore, in order to better limit the first guide post 35 between the inclined positioning block 32 and the guide post block 33, this application preferably threaded one end of the first guide post 35 to the side wall of the guide post block 33, and sets the end of the first guide post 35 near the inclined positioning block 32 as an optical axis. The optical axis passes through the third locking plane 324 and slides but does not disengage from the aforementioned limiting groove 323, thereby realizing that the inclined positioning block 32 presses the first guide post 35 in the limiting groove 323 under the action of the inclined block 31, or moves away from the first guide post 35 in the limiting groove 323. It should be noted that the optical axis used in this application is a mechanical part used to support rotating parts or is itself a rotating part, playing the role of transmitting motion, torque, etc. in machinery, and is generally set as a cylindrical structure.

[0061] As an optional implementation, the inclined positioning block 32 is further provided with a horizontal fourth locking plane 325 on the side near the intermediate transition plate 20. This fourth locking plane 325 is parallel to the top of the intermediate transition plate 20. That is, the first locking inclined surface 321 of the inclined positioning block 32 provided in this application contacts the inclined block 31, the third locking plane 324 of the inclined positioning block 32 is correspondingly provided with the guide post block 33, and the fourth locking plane 325 of the inclined positioning block 32 is parallel to the top of the intermediate transition plate 20, thereby relatively limiting the inclined positioning block 32 within the space formed by the inclined block 31, the guide post block 33, and the intermediate transition plate 20.

[0062] When the inclined block 31 is locked downwards or released upwards by the first locking member 34, the inclined positioning block 32 can move horizontally on the top of the intermediate adapter plate 20 via the fourth locking plane 325. Of course, the fourth locking plane 325 can also be set to slide in conjunction with the top of the inclined positioning block 32; both of these settings are feasible.

[0063] Furthermore, this application also provides a plurality of buffer mechanisms 40 between the leveling mechanism 30 and the forming platform 10. One end of the buffer mechanism 40 abuts against the second locking inclined surface 322 of the inclined positioning block 32, and the other end of the buffer mechanism 40 passes through the intermediate adapter plate 20 and is fixedly connected to the forming platform 10.

[0064] For details, please refer to Figure 4 This is a three-dimensional assembly diagram of a photopolymerization 3D printing platform provided in an embodiment of this application. The buffer mechanism 40 includes a double-ended bolt 41 that passes through the intermediate adapter plate 20 and the forming platform 10. The double-ended bolt 41 has threads at both ends and a screw in the middle. It is often used for fixed connections in machinery. In this application, a countersunk hole 21 is provided on the intermediate adapter plate 20 for the double-ended bolt 41 to pass through. One end of the double-ended bolt 41 abuts against the second locking inclined surface 322, and the other end of the double-ended bolt 41 passes through the countersunk hole 21 provided on the intermediate adapter plate 20 and is threadedly connected to the forming platform 10.

[0065] Furthermore, the end of the double-ended bolt 41 near the second locking ramp 322 is also provided with an anti-loosening nut 42 and a buffer spring 43. In actual operation, external loads such as vibration, change, and high temperature of materials may reduce the friction of the double-ended bolt 41, thereby loosening the threaded connection. If it is subjected to repeated action, it will loosen and fail. Therefore, it is necessary to perform anti-loosening treatment on the double-ended bolt 41. In this application, an anti-loosening nut 42 that is compatible with its thread is provided at the end of the double-ended bolt 41 for anti-loosening. The buffer spring 43 is sleeved around the outer wall of the double-ended bolt 41. At the same time, the anti-loosening nut 42 can also limit the buffer spring 43 between the countersunk hole 21 and the bottom of the anti-loosening nut 42.

[0066] It should be noted that the top diameter of the countersunk hole 21 provided in this application needs to be slightly larger than the outer diameter of the double-ended bolt 41. Its diameter needs to accommodate the double-ended bolt 41 and the buffer spring 43 provided on the outer side wall of the double-ended bolt. The bottom diameter of the countersunk hole 21 is adapted to the outer diameter of the double-ended bolt 41, so that the bottom of the double-ended bolt 41 passes through the countersunk hole 21, and the buffer spring 43 is limited between the bottom of the countersunk hole 21 and the bottom of the anti-loosening nut 42.

[0067] In one specific embodiment provided in this application, please continue to refer to... Figure 1 The number of leveling mechanisms 30 is preferably set to four. These four leveling mechanisms 30 are arranged in a rectangular shape and are respectively set at the top four corners of the intermediate transition plate 20. At the same time, there are also four buffer mechanisms 40. The double-headed bolts 41 of the four buffer mechanisms 40 are set to the second locking slope 322 of the leveling mechanism 30. It is necessary to ensure that one end of the double-headed bolt 41 abuts against the second locking slope 322 of the leveling mechanism 30 at the corresponding position.

[0068] Please continue to refer to Figure 2This application uses the downward tightening of the first locking member 34 to drive the inclined block 31 to move downward. Since the first locking inclined surface 321 of the inclined positioning block 32 is in direct contact with the inclined block 31, the downward movement of the inclined block 31 can be converted into the rightward movement of the inclined positioning block 32 as a whole. A first guide post 35 is provided between the inclined positioning block 32 and the guide post block 33, and the bottom of the second locking inclined surface 322 abuts against the corresponding double-headed bolt 41. Therefore, when the inclined positioning block 32 moves to the right as a whole, the inclined structure converts it into the downward movement of the double-headed bolt 41. A buffer spring 43 is provided around the outer wall of the double-headed bolt 41. Therefore, when the double-headed bolt 41 moves downward, it can further drive the anti-loosening nut 42 to compress the buffer spring 43 below. The buffer spring 43 has damping, so it can convert the downward pulling force into elastic potential energy for buffering, thereby transferring the pulling force acting on the model to the buffer spring 43. This provides spring buffering for the repeated up and down pulling process of the model during printing, avoiding direct impact on the model itself.

[0069] As an optional implementation, this application further provides a plurality of second guide posts 22 between the molding platform 10 and the intermediate transition plate 20. A guide groove 23 is provided at the bottom of the intermediate transition plate 20 to cooperate with the second guide posts 22 to move up and down. One end of the second guide post 22 is fixedly connected to the top of the molding platform 10, and the other end of the second guide post 22 is connected to the guide groove 23 at the corresponding position but does not detach from the guide groove 23. By providing a plurality of second guide posts 22, the intermediate transition plate 20 is positioned above the molding platform 10. It can also cooperate with the buffer mechanism 40 to provide buffer for the repeated up and down pulling of the model during printing, preventing the model from falling off during the repeated up and down pulling process.

[0070] Please continue to refer to Figure 5 This is a left view of a photopolymerization 3D printing platform provided in an embodiment of this application. The application also provides an assembly base 50 connected to a lifting mechanism on the top of the intermediate adapter plate 20. In practical applications, the assembly base 50 is connected to the lifting mechanism, thereby enabling the lifting mechanism to move the assembly base 50, the intermediate adapter plate 20 fixedly connected below the assembly base 50, and the forming platform 10 at the bottom of the intermediate adapter plate 20 up and down. The bottom two sides of the assembly base 50 are provided with an "n"-shaped assembly adapter plate 51. Of course, other configurations are also feasible. In principle, it should not affect the configuration position of the several leveling mechanisms 30 provided above the intermediate adapter plate 20. The top of the assembly adapter plate 51 is fixedly connected to the bottom two sides of the assembly base 50 by the first fixing bolt 52.

[0071] To more securely fix the mounting base 50 to the top of the intermediate adapter plate 20, this application also provides an extension 511 at the bottom of the mounting adapter plate 51. A second fixing bolt 53 is provided on the extension 511 to fix the mounting adapter plate 51 and the mounting base 50 on the mounting adapter plate 51. A second locking member 54 is provided on the top of the mounting base 50. This second locking member 54 is preferably in the form of a bolt. Tightening or loosening this second adjusting bolt allows for vertical adjustment of the intermediate adapter plate 20 and the forming platform 10, thereby adjusting the relative position between the bottom of the forming platform 10 and the upper surface of the printing screen.

[0072] Based on the aforementioned photopolymer 3D printing platform, this application also provides a photopolymer 3D printing device, which includes a machine base, a material tank located on the machine base, a printing platform, a lifting mechanism for driving the molding platform 10 to rise and fall, and the aforementioned photopolymer 3D printing platform. For other details regarding the implementation of the above technical solution by the aforementioned photopolymer 3D printing device, please refer to the description of the photopolymer 3D printing platform provided in the embodiments of the above application, which will not be repeated here.

[0073] Based on the aforementioned photopolymer 3D printing platform, this application also provides a photopolymer 3D printing method, please refer to... Figure 8 This is a flowchart of a photopolymerization 3D printing method provided in an embodiment of this application. The method specifically includes the following steps:

[0074] Step S1: Move the forming platform 10 downwards until its bottom surface contacts the upper surface of the printing screen;

[0075] It should be noted that before printing, the entire photopolymer 3D printing platform needs to be moved downwards by the lifting mechanism until the bottom surface of the printing platform 10 of the photopolymer 3D printing platform contacts the upper surface of the printing screen. However, at this time, the bottom surface of the printing platform 10 and the upper surface of the printing screen are not parallel, and there is a gap between them. Therefore, the forming platform 10 needs to be leveled further.

[0076] Step S2: Level the forming platform 10, tighten the first locking part 34 to drive the inclined block 31 downward, the inclined positioning block 32 to the right, the double-headed bolt 41 and the forming platform 10 downward until the lower plane of the forming platform 10 is parallel to and in contact with the upper plane of the printing screen.

[0077] In this embodiment, leveling can be achieved by tightening the first locking member 34 at the corresponding position. When the first locking member 34 is tightened, the downward tightening pressure further drives the inclined block 31 to move downward, the inclined block 31 further drives the inclined positioning block 32 to move to the right, and the inclined positioning block 32 further drives the double-headed bolt 41 and the forming platform 10 to move downward. Once leveling is achieved until the lower plane of the forming platform 10 is parallel to and in contact with the upper plane of the printing screen, printing can begin.

[0078] Step S3: Pull the molded model that has been photocured and attached to the bottom of the molding platform 10 in the material tank upwards, and the buffer spring 43 will return to its original shape, which will drive the double-headed bolt 41 and the molding platform 10 back to the leveling position.

[0079] In this embodiment, after leveling the molding platform 10, formal printing can begin. The molding platform 10 needs to be lowered to the curing position within the material tank. Because the double-headed bolt 41 is blocked by the inclined positioning block 32, the molding platform 10 remains in the leveled position after descending into the material tank. After this layer is printed, the molding platform 10 is pulled upwards. Since the lower surface of the molding platform 10 has been sandblasted and has a high surface roughness, the adhesion between the model curing resin layer and the molding platform 10 is greater than the adhesion between the model curing resin layer and the release film. During the upward pulling process, the release film exerts a downward pulling force on the model curing resin layer. This pulling force is further transmitted to the buffer spring 43 through the molding platform 10 and the double-headed bolt 41. By compressing the buffer spring 43, the compression is converted into elastic potential energy, thereby achieving buffer release and preventing the release film pulling force from directly acting on the printed model. At this time, the molding platform 10 is in a position below the leveled position.

[0080] After the model's cured resin layer peels off from the release film, the compressed buffer spring 43 returns to its original shape. Since a locking nut 42 is provided above the buffer spring 43, the locking nut 42 and the buffer spring 43 can drive the double-ended bolt 41 and the molding platform 10 back to the leveling position, maintaining the molding platform 10 in the initial leveling position after being stretched upwards. At this point, the 3D printing process of one layer can be considered to have been completed.

[0081] Step S4: Control the molding platform 10 to pull up and down repeatedly until the model is printed.

[0082] It should be noted that during the entire printing process, the photopolymer 3D printing platform will move up and down repeatedly along the Z-axis, which is the vertical direction. Step S3 has already provided the process for printing one layer of 3D. In the actual 3D printing process, the 3D model file to be printed needs to be imported into the slicing software of the photopolymer 3D printer for slicing. During the printing process, 3D printing is also carried out layer by layer according to the slicing results. Therefore, step S4 needs to repeat the operation steps of step S3 until the final printing of the model is completed.

[0083] For other details regarding the implementation of the above-mentioned technical solution using the photopolymerization 3D printing method, please refer to the specific description of the photopolymerization 3D printing platform provided in the above-mentioned application embodiments, which will not be repeated here.

[0084] This application provides a photopolymerization 3D printing platform and printing method. By setting a leveling mechanism above the molding platform and a buffer mechanism between the leveling mechanism and the molding platform, a spring buffer is provided for the repeated up-and-down pulling process of the model during printing. By tightening the first locking component, the pressure generated by tightening downwards is transmitted through the inclined block and the inclined positioning block, which in turn drives the double-headed bolt and the molding platform to move downwards. During the repeated up-and-down pulling process of the molding platform, the pull force of the release film is transmitted to the spring through the buffer spring, providing a buffer for the molding platform and the model attached below the molding platform. This prevents the pull force of the release film generated during printing from acting directly on the printed model, avoiding model drop and thus improving the printing success rate.

[0085] It is understood that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above embodiments are merely exemplary implementations used to illustrate the principles of this application; however, this application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this application, and these modifications and improvements are also considered to be within the scope of protection of this application.

Claims

1. A photopolymerization 3D printing platform, characterized in that, include: Molding platform; An intermediate adapter plate is disposed above the forming platform, and the intermediate adapter plate can be driven to drive the forming platform to move linearly in the vertical direction; Several leveling mechanisms are disposed above the intermediate transition plate. Each leveling mechanism includes an inclined block, an inclined positioning block that abuts against the side of the inclined block, and a guide post block fixedly disposed above the intermediate transition plate. A first locking member is disposed through the upper part of the inclined block, and the first locking member passes vertically through the inclined block and the intermediate transition plate under the support of the inclined block. A first guide post is disposed on the side of the guide post block near the inclined positioning block. A limiting groove is disposed in the inclined positioning block to allow the first guide post to move horizontally, so that the inclined positioning block moves horizontally in a direction away from or close to the inclined block under the guidance of the first guide post. Several elastically supported buffer mechanisms are provided between the inclined positioning block and the forming platform. One end of the buffer mechanism abuts against the side of the inclined positioning block, and the other end of the buffer mechanism passes through the intermediate adapter plate and is fixedly connected to the forming platform.

2. The photopolymerization 3D printing platform as described in claim 1, characterized in that, A first locking ramp is provided on the side of the inclined positioning block near the inclined block, and the side of the inclined block abuts against the inclined positioning block through the first locking ramp; The inclined positioning block is provided with a second locking inclined surface on the side near the guide post block, and one end of the buffer mechanism abuts against the inclined positioning block through the second locking inclined surface.

3. The photopolymerization 3D printing platform as described in claim 1, characterized in that, The inclined positioning block is also provided with a vertical third locking plane on the side near the first guide post. One end of the first guide post is threaded to the side wall of the guide post block, and the other end of the first guide post is an optical axis. The optical axis passes through the third locking plane and slides but does not disengage from the limiting groove, so that the inclined positioning block presses against the first guide post in the limiting groove under the action of the inclined block, or moves away from and releases the first guide post in the limiting groove.

4. The photopolymerization 3D printing platform as described in claim 1, characterized in that, The inclined positioning block has a fourth locking plane in the horizontal direction on the side near the intermediate adapter plate. The fourth locking plane is parallel to the top of the inclined positioning block. When the first locking member locks the inclined block downward or releases it upward, the inclined positioning block moves horizontally on the top of the intermediate adapter plate through the fourth locking plane.

5. The photopolymerization 3D printing platform as described in claim 2, characterized in that, The buffer mechanism includes a double-ended bolt that passes through the intermediate adapter plate and the forming platform. The intermediate adapter plate is provided with a countersunk hole for the buffer mechanism to pass through. One end of the double-ended bolt abuts against the second locking inclined surface, and the other end of the double-ended bolt passes through the countersunk hole and is threadedly connected to the forming platform. The double-ended bolt is provided with an anti-loosening nut and a buffer spring at one end near the second locking bevel. The buffer spring is sleeved around the outer wall of the double-ended bolt, and the buffer spring is limited between the countersunk hole and the bottom of the anti-loosening nut by the anti-loosening nut.

6. The photopolymerization 3D printing platform as described in claim 1, characterized in that, A plurality of second guide posts are provided between the molding platform and the intermediate transition plate. The bottom of the intermediate transition plate is provided with a guide groove for the second guide posts to move up and down. One end of the second guide post is fixedly connected to the top of the molding platform, and the other end of the second guide post is slidably connected to the corresponding guide groove but not detached from the guide groove.

7. The photopolymerization 3D printing platform as described in claim 2, characterized in that, The number of the leveling mechanisms is four, and the four leveling mechanisms are distributed in a rectangular shape and are respectively set at the top four corners of the intermediate transition plate. The number of buffer mechanisms is four, and the four buffer mechanisms are set on the second locking slope of the four leveling mechanism slope positioning blocks.

8. The photopolymerization 3D printing platform as described in claim 1, characterized in that, The first locking element is a first adjusting bolt, which can be adjusted to lock the inclined block downwards or loosen it upwards.

9. The photopolymerization 3D printing platform as described in claim 1, characterized in that, The top of the intermediate transition plate is also provided with an assembly base connected to the lifting mechanism. The lifting mechanism is used to drive the intermediate transition plate to move linearly in a direction away from or close to the forming platform. The bottom two sides of the assembly base are provided with "n"-shaped assembly adapter plates. The top of the assembly adapter plates is fixedly connected to the bottom two sides of the assembly base by a first fixing bolt. The bottom of the assembly adapter plates is provided with an extension portion. The assembly adapter plates are fixed to the top of the intermediate adapter plate by a second fixing bolt provided on the extension portion.

10. A photopolymerization 3D printing platform as described in claim 9, characterized in that, The top of the assembly base is provided with a second locking component, which is a second adjusting bolt. The vertical position of the intermediate adapter plate and the forming platform can be adjusted by adjusting the second adjusting bolt.

11. A photopolymerization 3D printing method, characterized in that, Applied to the photopolymerization 3D printing platform as described in any one of claims 1-10, the method includes the following steps: Move the forming platform downwards until its bottom surface contacts the top surface of the printing screen; Level the forming platform, tighten the first locking component to drive the inclined block downward, the inclined positioning block to the right, the double-headed bolt and the forming platform downward until the lower plane of the forming platform is parallel to and in contact with the upper plane of the printing screen; Pull the mold that has been photocured and attached to the bottom of the molding platform in the material tank upwards. The buffer spring will return to its original shape, which will drive the double-headed bolt and the molding platform back to the leveling position. Control the molding platform to repeatedly pull up and down until the model is printed.

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