Photocuring 3D printing platform and printing method

Abstract

The present application discloses a photocuring 3D printing platform and printing method. The photocuring 3D printing platform comprises: a forming platform; a middle adapter plate, the middle adapter plate being capable of being driven to drive the forming platform to do linear motion in a vertical direction; several leveling mechanisms arranged on the middle adapter plate, each leveling mechanism comprising an inclined surface block, an inclined surface positioning block abutting against a side edge of the inclined surface block, and a guide column block fixed on the middle adapter plate; and several buffer mechanisms elastically supported between the inclined surface positioning blocks and the forming platform, one end of each buffer mechanism abutting against a side edge of the corresponding inclined surface positioning block, and the other end of the buffer mechanism penetrating the middle adapter plate and then being fixedly connected to the forming platform.

Description

Light-curing 3D printing platform and printing method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 22, 2023, with application number 202311566015.X, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of 3D printing technology, and specifically relates to a light-curing 3D printing platform and a printing method. Background Art

[0004] Stereolithography is a 3D printing technology widely used in modern science and technology. It uses an LCD (Liquid Crystal Display) screen as a mask and UV (Ultraviolet) as a light source to cure the resin through the pattern displayed on the LCD screen. The molding platform needs to be lowered to the bottom of the material tank containing the light-curing resin. The ultraviolet light source is arranged below the material tank. A printing screen is installed in the middle position above the light source and below the material tank to display the pattern of each layer of the model. Under the irradiation of the ultraviolet light, the light-curing resin is scanned according to the contour trajectory of the slice layer section of the part to be processed, generating a photopolymerization reaction, thereby forming multiple thin sections stacked on top of each other, and then obtaining a complete part model.

[0005] During the molding process, the currently used build platform pulls upward to remove the cured resin layer by layer from the trough. However, after leveling, the conventional build platform remains rigid, lacking a downward buffer. When printing large-section models, the model itself is subject to the full downward pull of the release film. If the first layer of the model is not firmly bonded to the build platform, the model can easily be pulled off the build platform, resulting in print failure. Therefore, providing a buffer for the build platform during the repeated up-and-down pulling of the model to prevent it from falling off the build platform is an urgent problem to be solved.

[0006] Summary of the Invention

[0007] The present application provides a light-curing 3D printing platform and a printing method, which are used to solve the problem of how to provide a buffer for the forming platform during the process of repeatedly pulling the model up and down to prevent the model from falling off the plate.

[0008] In order to solve the above technical problems, the present application provides a light-curing 3D printing platform, comprising:

[0009] Forming platform;

[0010] An intermediate transfer plate is provided above the forming platform, and the intermediate transfer plate can be driven to drive the forming platform to move linearly in a vertical direction;

[0011] A plurality of leveling mechanisms are arranged above the intermediate adapter plate, and the leveling mechanisms include an inclined plane block, an inclined plane positioning block abutting against a side edge of the inclined plane block, and a guide column block fixedly arranged above the intermediate adapter plate; a first locking piece is provided above the inclined plane block, and the first locking piece vertically passes through the inclined plane block and the intermediate adapter plate under the support of the inclined plane block; a first guide column is provided on the side of the guide column block close to the inclined plane positioning block, and a limiting slide groove for horizontal movement of the first guide column is provided in the inclined plane positioning block, so that the inclined plane positioning block can be horizontally moved in a direction away from or close to the inclined plane block under the guidance of the first guide column;

[0012] A plurality of buffer mechanisms are elastically supported between the inclined surface positioning block and the forming platform, one end of the buffer mechanism abuts against the side of the inclined surface positioning block, and the other end of the buffer mechanism passes through the intermediate adapter plate and is fixedly connected to the forming platform.

[0013] As a further improvement of the present application, a first locking bevel is provided on one side of the bevel positioning block close to the bevel block, and the side edge of the bevel block abuts against the bevel positioning block through the first locking bevel;

[0014] A second locking inclined surface is provided on one side of the inclined surface positioning block close to the guide column block, and one end of the buffer mechanism abuts against the inclined surface positioning block through the second locking inclined surface.

[0015] As a further improvement of the present application, a third locking plane in the vertical direction is also provided on the side of the inclined positioning block close to the first guide column, one end of the first guide column is threadedly connected to the side wall of the guide column block, and the other end of the first guide column is an optical axis. After passing through the third locking plane, the optical axis slides and fits but does not disengage from the limiting slide groove, so that the inclined positioning block is pressed and fitted with the first guide column in the limiting slide groove under the action of the inclined block, or moves away from and releases the first guide column in the limiting slide groove.

[0016] As a further improvement of the present application, a fourth horizontal locking plane is provided on one side of the inclined positioning block close to the intermediate adapter plate, and 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 the inclined block upward, the inclined positioning block realizes horizontal movement at the top of the intermediate adapter plate through the fourth locking plane.

[0017] As a further improvement of the present application, the buffer mechanism includes a stud bolt passing 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 stud bolt abuts against the second locking inclined surface, and the other end of the stud bolt passes through the countersunk hole and is threadedly connected to the forming platform;

[0018] A lock nut and a buffer spring are provided at one end of the stud bolt close to the second locking bevel. The buffer spring is arranged around the outer wall of the stud bolt, and the buffer spring is limited between the countersunk hole and the bottom of the lock nut by the lock nut.

[0019] As a further improvement of the present application, a plurality of second guide columns are arranged between the forming platform and the intermediate transfer plate, and a guide slot for the second guide columns to move up and down is provided at the bottom of the intermediate transfer plate. One end of the second guide column is fixedly connected to the top of the forming platform, and the other end of the second guide column is slidably connected to the corresponding guide slot but does not detach from the guide slot.

[0020] As a further improvement of the present application, the number of the leveling mechanisms is four, and the four leveling mechanisms are distributed in a rectangular shape and are correspondingly arranged at the top four corners of the intermediate adapter plate;

[0021] The number of the buffer mechanisms is four, and the four buffer mechanisms are arranged corresponding to the second locking inclined surfaces of the four inclined surface positioning blocks of the leveling mechanism.

[0022] As a further improvement of the present application, the first locking member is a first adjusting bolt, and the first adjusting bolt is adjusted to achieve downward locking or upward loosening of the corresponding inclined plane block.

[0023] As a further improvement of the present application, the top of the intermediate adapter plate is further provided with an assembly seat connected to a lifting mechanism, and the lifting mechanism is used to drive the intermediate adapter plate to move linearly in a direction away from or close to the forming platform;

[0024] An "n"-shaped assembly adapter plate is provided on both sides of the bottom of the assembly seat. The top of the assembly adapter plate is fixedly connected to the two sides of the bottom of the assembly seat through a first fixing bolt. An extension portion is provided at the bottom of the assembly adapter plate, and the assembly adapter plate is fixed to the top of the middle adapter plate by a second fixing bolt provided on the extension portion.

[0025] As a further improvement of the present application, a second locking member is provided on the top of the assembly seat, and the second locking member is a second adjusting bolt. By adjusting the second adjusting bolt, the upper and lower positions of the intermediate transfer plate and the forming platform can be adjusted.

[0026] Based on the above-mentioned light-curing 3D printing platform, the present application also provides a light-curing 3D printing method, which is applied to any of the above-mentioned light-curing 3D printing platforms, and the method comprises the following steps:

[0027] Move the build platform downward until its bottom surface contacts the upper plane of the print screen;

[0028] Level the building platform by tightening the first locking piece to move the inclined block downward, the inclined positioning block to the right, and the stud bolt and the building platform downward until the lower plane of the building platform is parallel to and in contact with the upper plane of the print screen;

[0029] Pull the model in the trough that has been light-cured and attached to the bottom of the building platform upwards, and the buffer spring returns to its original shape, driving the stud bolts and the building platform to return to the leveling position;

[0030] The forming platform is controlled to be pulled up and down repeatedly until the model is printed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] FIG1 is a schematic structural diagram of a light-curing 3D printing platform provided by one or more embodiments of the present application;

[0033] FIG2 is a front view of a light-curing 3D printing platform provided by one or more embodiments of the present application;

[0034] FIG3 is a cross-sectional view of a light-curing 3D printing platform along a main view provided by one or more embodiments of the present application;

[0035] FIG4 is a three-dimensional assembly diagram of a light-curing 3D printing platform provided by one or more embodiments of the present application;

[0036] FIG5 is a left side view of a light-curing 3D printing platform provided by one or more embodiments of the present application;

[0037] FIG6 is a schematic structural diagram of an inclined surface positioning block in a light-curing 3D printing platform provided by one or more embodiments of the present application;

[0038] FIG7 is a schematic diagram of a structure for leveling a light-curing 3D printing platform in the prior art;

[0039] FIG8 is a flowchart of a photocuring 3D printing method provided by one or more embodiments of the present application.

[0040] Explanation of the accompanying drawings: 10-forming platform; 20-intermediate adapter plate; 21-countersunk hole; 22-second guide column; 23-guide slot; 30-leveling mechanism; 31-inclined block; 32-inclined positioning block; 321-first locking inclined plane; 322-second locking inclined plane; 323-limiting slot; 324-third locking plane; 325-fourth locking plane; 33-guide column block; 34-first locking member; 35-first guide column; 40-buffer mechanism; 41-stud bolt; 42-locking nut; 43-buffer spring; 50-assembly seat; 51-assembly adapter plate; 511-extension portion; 52-first fixing bolt; 53-second fixing bolt; 54-second locking member. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is 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 only used to explain this application and are not intended to limit this application.

[0042] In the description of this application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement of the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0043] To provide a more detailed and complete description of the present disclosure, the following provides illustrative descriptions of the embodiments and examples of the present application; however, these descriptions are not intended to be the only ways to implement or use the embodiments of the present application. The embodiments cover features of various embodiments, as well as the method steps and sequences for constructing and operating these embodiments. However, other embodiments may also be used to achieve the same or equivalent functionality and step sequences.

[0044] Referring to Figures 1-7, in order to solve the problem of providing a buffer for the forming platform during the repeated up and down pulling of the model to prevent the model from falling off the plate in the prior art, an embodiment of the present application provides a light-curing 3D printing platform. Referring to Figure 1, which is a schematic structural diagram of a light-curing 3D printing platform provided in an embodiment of the present application, the light-curing 3D printing platform includes a forming platform 10, an intermediate adapter plate 20 disposed above the forming 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 forming platform 10.

[0045] A common stereolithography 3D printer typically consists of a machine base, a trough located on the base, a printing platform, and a lifting mechanism that drives the build platform up and down. The build platform 10 is lowered into a trough filled with photocurable resin. The resin in the trough gradually solidifies under ultraviolet light and adheres to the bottom of the build platform. The lifting mechanism is used to lower the build platform 10 into the trough and pull upward the cured model attached to the bottom of the build platform 10. Because the lower surface of the build platform 10 is sandblasted and has a high surface roughness, the adhesion between the model's cured resin layer and the build platform 10 is greater than the adhesion between the model's cured resin layer and the release film. Therefore, when the build platform 10 is pulled upward, the cured resin layer adheres to the build platform 10 and simultaneously peels away from the release film. However, in actual applications, when the molding platform 10 is repeatedly pulled up and down, the release film will exert a downward pulling force on the solidified 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 will easily be pulled off the plate, resulting in printing failure. Therefore, the present application provides an intermediate transfer plate 20 above the molding platform 10, and provides several leveling mechanisms 30 above the intermediate transfer plate 20, as well as several buffer mechanisms 40 between the leveling mechanism 30 and the molding platform 10, to solve the above problems.

[0046] Specifically, please continue to refer to Figure 1. In the embodiment of the present application, the intermediate transfer plate 20 is set above the molding platform 10, wherein the intermediate transfer plate 20 can be driven to drive the molding platform 10 to move linearly in the vertical direction. In a specific embodiment provided in the present application, the intermediate transfer plate 20 is connected to a lifting mechanism, and the lifting mechanism is used to drive the intermediate transfer plate 20 and the molding platform 10 to move linearly in the direction away from or close to the material trough. Since the intermediate transfer plate 20 is set above the molding platform 10 and is connected to the molding platform 10 through a number of second guide columns 22, it is possible to achieve the intermediate transfer plate 20 driven by the lifting mechanism to further drive the molding platform 10 to move linearly in the vertical direction.

[0047] It is understandable that as long as the intermediate transfer plate 20 can be driven to move the forming platform 10 away from and towards the bottom trough, other lifting mechanisms or other settings are feasible and are not limited to the above description.

[0048] As an optional embodiment, before formal printing, the forming platform 10 needs to move downward until the bottom of the forming platform 10 contacts the printing screen, and it is necessary to ensure that the bottom of the forming platform 10 is parallel to the upper plane of the printing screen set at the bottom; please refer to Figure 7, which is a structural diagram of leveling the light-curing 3D printing platform in the prior art. It can be seen that the leveling of the forming platform in the prior art is achieved by tightening the four screws on the left and right sides of the assembly adapter plate. However, after the leveling is completed, the forming platform as a whole is in a rigid state, and the pulling force of the release film between the cured resin layer and the release film will all act on the printed model. If the pulling force is too large, it will easily cause the model to fall off the plate, resulting in printing failure. Therefore, the present application cancels the method of leveling by tightening the side screws, and instead sets up a number of leveling mechanisms 30 above the middle adapter plate 20. This not only adjusts the level of the forming platform 10 before printing, but also cooperates with the buffer mechanism 40 to provide buffering during the repeated up and down pulling process, maintaining the forming platform 10 in a leveled position after being stretched upward, and transmitting the pulling force of the release film to the buffer mechanism 40, reducing the probability of the model falling off the plate, thereby improving the subsequent model forming quality.

[0049] Specifically, please refer to Figure 2, which is a main view of a light-curing 3D printing platform provided in an embodiment of the present application. It can be observed that the leveling mechanism 30 includes a bevel block 31, a bevel positioning block 32, and a guide column block 33 fixedly arranged above the intermediate adapter plate 20, wherein a first locking member 34 is provided above the bevel block 31, and the bottom of the bevel block 31 is arranged parallel to the top of the intermediate adapter plate 20 and retains a certain gap. The above-mentioned first locking member 34 passes vertically through the bevel block 31 and the intermediate adapter plate 20 under the support of the bevel block 31, so as to realize the downward locking or upward loosening of the bevel block 31 through the first locking member 34; in a specific embodiment provided in the present application, the above-mentioned first locking member 34 is preferably set in the form of an adjusting bolt, and the downward locking or upward loosening of the corresponding lower bevel block 31 is realized by the first adjusting bolt.

[0050] Further, please refer to Figure 6, which is a structural schematic diagram of a bevel positioning block 32 in a light-curing 3D printing platform provided in an embodiment of the present application. The bevel positioning block 32 is arranged between the bevel block 31 and the guide column block 33, and a first locking bevel 321 is provided on the side of the bevel positioning block 32 close to the bevel block 31, so that the side of the bevel block 31 is abutted against the bevel positioning block 32 through the first locking bevel 321.

[0051] In a specific embodiment provided in the present application, a first locking bevel 321 inclined upward is provided on the side of the bevel positioning block 32 close to the bevel block 31. The side of the bevel block 31 close to the bevel positioning block 32 is preferably set to an bevel parallel to the first locking bevel 321. Of course, it can also be set to other inclination angles. As long as the first locking bevel 321 close to the bevel positioning block 32 can be achieved, the downward locking pressure or upward loosening tension of the first adjusting bolt on the bevel block 31 is transmitted to the bevel positioning block 32, other selected contact surface forms are feasible.

[0052] In a specific embodiment provided in the present application, in order to cooperate with the first locking piece 34 vertically passing through the top, the intermediate adapter plate 20 arranged parallel to the bottom, and the first locking bevel 321 in contact with the side, it is preferred to set the bevel block 31 to a structure with an isosceles trapezoidal cross-section. Of course, the above is only used as a preferred specific implementation method and does not serve as a further limitation on the bevel block 31 provided in the present application.

[0053] As an optional embodiment, the above-mentioned guide column block 33 is fixed above the intermediate adapter plate 20 and extends upward, and together with the bevel block 31, the bevel positioning block 32 is confined between the bevel block 31 and the guide column block 33. A second locking bevel 322 is provided on the side of the bevel positioning block 32 close to the guide column block 33, so that one end of the buffer mechanism 40 is abutted against the bevel positioning block 32 through the second locking bevel 322.

[0054] In a specific embodiment provided in the present application, a second locking bevel 322 is provided on one side of the bevel positioning block 32 close to the guide column block 33 to match the first locking bevel 321 provided with an upward bevel. Of course, the first locking bevel 321 and the second locking bevel 322 can also be provided with inclinations in opposite directions.

[0055] The present application does not impose any further restrictions on the degree of inclination of the second locking bevel 322 and the first locking bevel 321 , as long as the first locking bevel 321 and the second locking bevel 322 of the bevel positioning block 32 form two bevel features at a certain angle with the intermediate adapter plate 20 .

[0056] Further, please refer to Figure 3, which is a sectional view along the main view of a light-curing 3D printing platform provided in an embodiment of the present application. It can be observed that a first guide column 35 extending in the horizontal direction is provided on the side of the guide column block 33 close to the bevel positioning block 32, and a limiting slide groove 323 for horizontal movement of the first guide column 35 is provided at the position of the bevel positioning block 32 corresponding to the first guide column 35, thereby limiting the horizontal movement of the bevel positioning block 32 intelligently along the direction of the first guide column 35, that is, the bevel positioning block 32 is guided by the first guide column 35 and moves in a direction away from or close to the guide column block 33.

[0057] Taking into account that the side wall of the guide column block 33 is a plane, while the side wall of the inclined positioning block 32 is an inclined surface, when the inclined positioning block 32 moves toward the direction of the guide column block 33 under the guidance of the first guide column 35, there is insufficient contact. Therefore, the present application also provides a third locking plane 324 in a vertical direction on the side of the inclined positioning block 32 close to the first guide column 35. The third locking plane 324 is arranged parallel to the side wall of the first guide column 35, and the limiting slide groove 323 is further adjusted to the position of the third locking plane 324 and extended in the direction of the inclined block 31, so that the first guide column 35 passes through the third locking plane 324 and then slides into the limiting slide groove 323. In principle, it is necessary to satisfy that the end of the first guide column 35 slides inside the limiting slide groove 323 but does not separate from the limiting slide groove 323.

[0058] Furthermore, in order to better limit the first guide column 35 between the inclined plane positioning block 32 and the guide column block 33, the present application preferably threads one end of the first guide column 35 on the side wall of the guide column block 33, and sets the end of the first guide column 35 close to the inclined plane positioning block 32 as an optical axis. After passing through the third locking plane 324, the optical axis slides to fit but does not separate from the above-mentioned limiting groove 323, thereby realizing that the inclined plane positioning block 32 is pressed to fit the first guide column 35 in the limiting groove 323 under the action of the inclined plane block 31, or moves away from and releases the first guide column 35 in the limiting groove 323; it should be noted that the optical axis used in the present application is a mechanical part used to support rotating parts or itself serves as a rotating part, which plays a role in transmitting motion, torque, etc. in the machine, and is generally set to a cylindrical structure.

[0059] As an optional embodiment, a fourth locking plane 325 is further provided on the side of the inclined surface positioning block 32 close to the intermediate adapter plate 20, and the fourth locking plane 325 is arranged in parallel with the top of the intermediate adapter plate 20, that is, the first locking inclined surface 321 of the inclined surface positioning block 32 provided in the present application is in contact with the inclined surface block 31, and the third locking plane 324 of the inclined surface positioning block 32 is arranged corresponding to the guide column block 33, and the fourth locking plane 325 of the inclined surface positioning block 32 is arranged in parallel with the top of the intermediate adapter plate 20, thereby relatively limiting the inclined surface positioning block 32 in the space formed by the inclined surface block 31, the guide column block 33 and the intermediate adapter plate 20.

[0060] When the inclined plane block 31 is locked downward or released upward by the first locking member 34, the inclined plane positioning block 32 can be moved 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 directly configured to slide with the top of the inclined plane positioning block 32. All of the above configurations are feasible.

[0061] Furthermore, the present application also provides several 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 slope 322 of the slope 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.

[0062] Specifically, please refer to Figure 4, which is a three-dimensional assembly diagram of a light-curing 3D printing platform provided in an embodiment of the present application. The buffer mechanism 40 includes a stud bolt 41 that passes through the intermediate adapter plate 20 and the molding platform 10. The stud bolt 41 has threads on both ends and a screw in the middle, which is often used for mechanical fixed connections. The present application provides a countersunk hole 21 on the intermediate adapter plate 20 for the stud bolt 41 to pass through. One end of the stud bolt 41 is abutted against the second locking bevel 322, and the other end of the stud bolt 41 is passed through the countersunk hole 21 provided on the intermediate adapter plate 20 and then threadedly connected to the molding platform 10.

[0063] Furthermore, an anti-loosening nut 42 and a buffer spring 43 are provided at one end of the stud bolt 41 near the second locking bevel 322. Since in actual work, external loads such as vibration, change, and high material temperature may cause the friction of the stud bolt 41 to decrease, thereby loosening the threaded connection. After repeated action, the stud bolt 41 will become loose and fail. Therefore, it is necessary to prevent the stud bolt 41 from loosening. In this application, an anti-loosening nut 42 that matches its thread is provided at the end of the stud bolt 41 to prevent loosening; the buffer spring 43 is arranged around the outer wall of the stud bolt 41, and the anti-loosening nut 42 provided at the same time can also limit the buffer spring 43 between the countersunk hole 21 and the bottom of the anti-loosening nut 42.

[0064] It should be noted that the top aperture of the countersunk hole 21 provided in this application needs to be slightly larger than the outer diameter of the stud bolt 41, and its aperture needs to accommodate the stud bolt 41 and the buffer spring 43 set on the outer wall of the stud bolt. The bottom aperture of the countersunk hole 21 is adapted to the outer diameter of the stud bolt 41 to ensure that the bottom of the stud 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 anti-loosening nut 42.

[0065] In a specific embodiment provided in the present application, please continue to refer to Figure 1. The number of leveling mechanisms 30 is preferably set to four. The four leveling mechanisms 30 are distributed in a rectangular shape and are correspondingly arranged at the four corners of the top of the middle adapter plate 20. At the same time, the buffer mechanisms 40 are also correspondingly set to four. The stud bolts 41 of the four buffer mechanisms 40 are arranged corresponding to the second locking bevel 322 of the leveling mechanism 30, and it is required to meet the requirement that one end of the stud bolt 41 is in contact with the second locking bevel 322 of the leveling mechanism 30 at the corresponding position.

[0066] 2, the present application drives the inclined plane block 31 to move downward by tightening the first locking member 34 downward. Since the first locking inclined surface 321 of the inclined plane positioning block 32 is in direct contact with the inclined plane block 31, the downward movement of the inclined plane block 31 can be converted into the rightward movement of the inclined plane positioning block 32 as a whole. A first guide column 35 is provided between the inclined plane positioning block 32 and the guide column block 33, and the bottom of the second locking inclined surface 322 is in contact with the corresponding stud bolt 41. Therefore, when the inclined plane positioning block 32 as a whole moves to the right, the first locking inclined surface 321 of the inclined plane positioning block 32 is in direct contact with the inclined plane block 31. The structure converts it into the downward movement of the stud bolt 41, and a buffer spring 43 is arranged around the outer wall of the stud bolt 41. Therefore, when the stud bolt 41 moves downward, it can further drive the anti-loosening nut 42 to compress the buffer spring 43 arranged below. The buffer spring 43 has damping, so the downward pulling force can be converted into elastic potential energy for buffering, thereby transferring the pulling force acting on the model to the buffer spring 43, providing spring buffering for the process of repeatedly pulling the model up and down during printing, avoiding direct impact on the model itself.

[0067] As an optional embodiment, the present application further provides a plurality of second guide posts 22 between the forming platform 10 and the intermediate transfer plate 20, and a guide slot 23 is provided at the bottom of the intermediate transfer plate 20 to cooperate with the second guide post 22 to move up and down. One end of the second guide post 22 is fixedly connected to the top of the forming platform 10, and the other end of the second guide post 22 is cooperated and connected with the guide slot 23 at the corresponding position but does not separate from the guide slot 23. By providing a plurality of second guide posts 22, the intermediate transfer plate 20 can be set above the forming platform 10, and can also cooperate with the buffer mechanism 40 to provide buffering for the process of repeatedly pulling the model up and down during printing, thereby preventing the model from falling off during the process of repeatedly pulling the model up and down.

[0068] Please continue to refer to Figure 5, which is a left view of a light-curing 3D printing platform provided in an embodiment of the present application. The present application also provides an assembly seat 50 connected to the lifting mechanism on the top of the intermediate adapter plate 20. In actual application, the assembly seat 50 is connected to the lifting mechanism, so that the lifting mechanism drives the assembly seat 50, the intermediate adapter plate 20 fixedly connected below the assembly seat 50, and the forming platform 10 at the bottom of the intermediate adapter plate 20 to move up and down; an "n"-shaped assembly adapter plate 51 is provided on both sides of the bottom of the assembly seat 50. Of course, other settings are also feasible. In principle, it cannot affect the setting position of the several leveling mechanisms 30 set above the intermediate adapter plate 20. The top of the assembly adapter plate 51 is fixedly connected to the two sides of the bottom of the assembly seat 50 by a first fixing bolt 52.

[0069] In order to more firmly fix the assembly seat 50 on the top of the intermediate adapter plate 20, the present application further provides an extension portion 511 at the bottom of the assembly adapter plate 51, and a second fixing bolt 53 is provided on the extension portion 511 to fix the assembly adapter plate 51 and the assembly seat 50 on the assembly adapter plate 51. A second locking member 54 is provided on the top of the assembly seat 50. The second locking member 54 is preferably in the form of a bolt. By tightening or loosening the second adjusting bolt, the upper and lower positions of the intermediate adapter plate 20 and the forming platform 10 can be adjusted, thereby adjusting the relative position between the bottom of the forming platform 10 and the upper surface of the printing screen.

[0070] Based on the aforementioned light-curing 3D printing platform, the present application further provides a light-curing 3D printing device, which includes a machine platform, a material trough located on the machine platform, a printing platform, a lifting mechanism for driving the molding platform 10 to rise and fall, and the aforementioned light-curing 3D printing platform. For other details regarding the implementation of the aforementioned technical solution by the light-curing 3D printing device, please refer to the description of the light-curing 3D printing platform provided in the aforementioned application embodiments, and will not be repeated here.

[0071] Based on the above-mentioned light-curing 3D printing platform, the present application further provides a light-curing 3D printing method. Please refer to FIG8 , which is a flow chart of a light-curing 3D printing method provided in an embodiment of the present application. The method specifically includes the following steps:

[0072] Step S1: Move the forming platform 10 downward until its bottom surface contacts the upper plane of the printing screen;

[0073] It should be noted that before printing, the entire light-curing 3D printing platform needs to be controlled by the lifting mechanism to move downward until the bottom surface of the printing platform 10 of the light-curing 3D printing platform contacts the upper plane of the printing screen. However, at this time, the bottom surface of the printing platform 10 is not parallel to the upper plane of the printing screen, and there is a gap between the two. Therefore, the molding platform 10 needs to be further leveled.

[0074] Step S2: Level the building platform 10 by tightening the first locking member 34 to move the inclined block 31 downward, the inclined positioning block 32 to the right, and the stud bolt 41 and the building platform 10 downward until the lower plane of the building platform 10 is parallel to and in contact with the upper plane of the printing screen;

[0075] In the embodiment of the present application, 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, and 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 stud bolt 41 and the forming platform 10 to move downward. Printing can be started after leveling until the lower plane of the forming platform 10 is parallel to and in contact with the upper plane of the printing screen.

[0076] Step S3: Pull the light-cured model in the trough that is attached to the bottom of the forming platform 10 upward, and the buffer spring 43 returns to its original position, driving the stud bolt 41 and the forming platform 10 to return to the leveled position;

[0077] In the embodiment of the present application, formal printing can begin after the leveling of the forming platform 10 is completed. The forming platform 10 needs to be lowered to the curing position in the material tank first. Since the stud 41 is blocked by the inclined positioning block 32 above, the forming platform 10 that has been lowered into the material tank remains in the leveled position. After the current layer of printing is completed, the forming platform 10 will be pulled upward. Since the lower surface of the forming platform 10 has been sandblasted and has a high surface roughness, the bonding force between the model curing resin layer and the forming platform 10 is greater than the bonding force between the model curing resin layer and the release film. During the upward pulling process, the release film will exert a downward pulling force on the model curing resin layer. This pulling force is further transmitted to the buffer spring 43 through the forming platform 10 and the stud 41. By compressing the buffer spring 43, its compression is converted into elastic potential energy, thereby achieving buffer release, preventing the release film pulling force from directly acting on the printed model. At this time, the forming platform 10 is in a position below the leveling position.

[0078] After the cured resin layer of the model is peeled off from the release film, the compressed buffer spring 43 returns to its original shape upward. Since a lock nut 42 is provided above the buffer spring 43, the lock nut 42 and the buffer spring 43 can drive the stud bolt 41 and the forming platform 10 to return to the leveling position, maintaining the forming platform 10 in the initial leveling position after being stretched upward. At this time, it can be considered that the 3D printing process of one layer has been completed.

[0079] Step S4: Control the forming platform 10 to be repeatedly pulled up and down until the model is printed.

[0080] It should be noted that during the entire printing process, the light-curing 3D printing platform will move up and down repeatedly in the Z-axis, that is, the vertical direction. In step S3, a layer of 3D printing process has been provided. Since in the actual 3D printing process, the model to be printed needs to first be imported into the slicing software of the light-curing 3D printer for slicing, and the 3D printing is also performed layer by layer according to the slicing results during the printing process, step S4 needs to repeat the operation steps of step S3 in a loop until the final printing of the model is completed.

[0081] For other details about the above-mentioned light-curing 3D printing method for implementing the above-mentioned technical solution, please refer to the specific description of the light-curing 3D printing platform provided in the above-mentioned application embodiments, which will not be repeated here.

[0082] The embodiment of the present application provides a light-curing 3D printing platform and a printing method. By arranging a leveling mechanism above the forming platform and a buffer mechanism between the leveling mechanism and the forming platform, a spring buffer is provided for the model to be repeatedly pulled up and down during printing. By tightening the first locking member, the pressure generated by tightening it downward can be transmitted through the inclined block and the inclined positioning block, and the stud bolt and the forming platform can be driven to move downward. In the process of repeatedly pulling the forming platform up and down, the pulling force of the release film is transmitted to the spring through the buffer spring, providing a buffer for the forming platform and the model attached below the forming platform, preventing the pulling force of the release film generated during the printing process from directly acting on the printed model, avoiding the model from falling off the plate, and thus improving the printing success rate.

[0083] It can be understood that the various technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various 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.

[0084] The above embodiments are merely exemplary embodiments for illustrating the principles of the present application, but the present application is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present application, and such modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A light-curing 3D printing platform, characterized in that: include: Forming platform; An intermediate transfer plate is arranged above the forming platform, and the intermediate transfer plate can be driven to drive the forming platform to move linearly in a vertical direction; A plurality of leveling mechanisms are arranged above the intermediate adapter plate, the leveling mechanisms comprising an inclined plane block, an inclined plane positioning block abutting against the side of the inclined plane block, and a guide column block fixedly arranged above the intermediate adapter plate; a first locking member is arranged through the upper part of the inclined plane block, and the first locking member vertically passes through the inclined plane block and the intermediate adapter plate under the support of the inclined plane block; a first guide column is arranged on the side of the guide column block close to the inclined plane positioning block, and a limiting slide groove for horizontal movement of the first guide column is arranged in the inclined plane positioning block, so that the inclined plane positioning block can be horizontally moved in a direction away from or close to the inclined plane block under the guidance of the first guide column; A plurality of buffer mechanisms are elastically supported between the inclined surface positioning block and the forming platform, one end of the buffer mechanism abuts against the side of the inclined surface 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. A light-curing 3D printing platform as claimed in claim 1, characterized in that: A first locking inclined surface is provided on one side of the inclined surface positioning block close to the inclined surface block, and the side edge of the inclined surface block abuts against the inclined surface positioning block through the first locking inclined surface; A second locking inclined surface is arranged on one side of the inclined surface positioning block close to the guide column block, and one end of the buffer mechanism abuts against the inclined surface positioning block through the second locking inclined surface.

3. A light-curing 3D printing platform as claimed in claim 1, characterized in that: A third locking plane in the vertical direction is also provided on one side of the inclined surface positioning block close to the first guide column, one end of the first guide column is threadedly connected to the side wall of the guide column block, and the other end of the first guide column is an optical axis. After passing through the third locking plane, the optical axis slides and fits in the limiting slide groove but does not disengage from it, so that the inclined surface positioning block can be pressed and fitted with the first guide column in the limiting slide groove under the action of the inclined surface block, or can be moved away from and released from the first guide column in the limiting slide groove.

4. A light-curing 3D printing platform as claimed in claim 1, characterized in that: A fourth locking plane in the horizontal direction is arranged on one side of the inclined plane positioning block close to the intermediate adapter plate, and the fourth locking plane is arranged in parallel and contact with the top of the inclined plane positioning block. When the first locking member locks the inclined plane block downward or releases the inclined plane block upward, the inclined plane positioning block realizes horizontal movement at the top of the intermediate adapter plate through the fourth locking plane.

5. The light-curing 3D printing platform according to claim 1, characterized in that: The buffer mechanism comprises a stud bolt penetrating 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 stud bolt abuts against the second locking inclined surface, and the other end of the stud bolt penetrates the countersunk hole and is threadedly connected to the forming platform; A lock nut and a buffer spring are provided at one end of the stud bolt close to the second locking bevel. The buffer spring is arranged around the outer wall of the stud bolt, and the buffer spring is limited between the countersunk hole and the bottom of the lock nut by the lock nut.

6. A light-curing 3D printing platform as claimed in claim 1, characterized in that: A plurality of second guide columns are arranged between the forming platform and the intermediate transfer plate, and a guide slot for the second guide column to move up and down is arranged at the bottom of the intermediate transfer plate, one end of the second guide column is fixedly connected to the top of the forming platform, and the other end of the second guide column is slidably connected to the corresponding guide slot but does not detach from the guide slot.

7. The light-curing 3D printing platform according to claim 1, characterized in that: The number of the leveling mechanisms is four, and the four leveling mechanisms are distributed in a rectangular shape and are correspondingly arranged at the top four corners of the intermediate adapter plate; The number of the buffer mechanisms is four, and the four buffer mechanisms are arranged corresponding to the second locking inclined surfaces of the four inclined surface positioning blocks of the leveling mechanism.

8. The light-curing 3D printing platform according to claim 1, characterized in that: The first locking member is a first adjusting bolt, and the first adjusting bolt is adjusted to achieve downward locking or upward loosening of the corresponding inclined plane block.

9. The light-curing 3D printing platform according to claim 1, characterized in that: The top of the intermediate adapter plate is also provided with an assembly seat connected to a lifting mechanism, and the lifting mechanism is used to drive the intermediate adapter plate to move linearly in a direction away from or close to the forming platform; An "n"-shaped assembly adapter plate is provided on both sides of the bottom of the assembly seat, and the top of the assembly adapter plate is fixedly connected to both sides of the bottom of the assembly seat by a first fixing bolt. An extension portion is provided at the bottom of the assembly adapter plate, and the assembly adapter plate is fixed to the top of the intermediate adapter plate by a second fixing bolt provided on the extension portion.

10. A light-curing 3D printing platform as claimed in claim 9, characterized in that: A second locking member is disposed on the top of the assembly seat, and the second locking member is a second adjusting bolt. The upper and lower positions of the intermediate adapter plate and the molding platform can be adjusted by adjusting the second adjusting bolt.

11. A light-curing 3D printing method, characterized in that: Applied to the light-curing 3D printing platform according to any one of claims 1 to 10, the method comprises the following steps: Move the build platform downward until its bottom surface contacts the upper plane of the print screen; Level the forming platform, tighten the first locking piece to drive the inclined plane block downward, the inclined plane positioning block to the right, the stud 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 up the model that has been light-cured and attached to the bottom of the molding platform in the trough, and the buffer spring returns to its original shape. Drive the stud bolts and the forming platform back to the leveling position; The forming platform is controlled to be pulled up and down repeatedly until the model is printed.

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