Modeling platform assembly for ultraviolet light 3D printing device

Abstract

The invention relates to a divisional application of which the application number is 2024112032628. The invention discloses a modeling platform assembly for an ultraviolet light 3D printing device, which can be mounted on a suspender on a transmission mechanism and comprises a printing platform, a guide mechanism and a hollow shaft torque motor, the printing platform can be mounted on the suspender through a ball joint bearing; the guiding mechanism comprises a limiting assembly and a guiding piece used for being installed on the hanging rod, the outer ring of a rolling bearing of the limiting assembly is fixed to the printing platform, the inner ring of the rolling bearing is connected with a second upper connecting rod, and the second upper connecting rod upwards penetrates through a guiding hole of the guiding piece; a stator of the hollow shaft torque motor can be fixed on the suspender, and a driving ring is fixedly mounted at the lower end of a rotor; the upper surface of the printing platform is an inclined driving face, and the driving ring abuts against the driving face. The printing platform swings through the inclined driving face, the included angle is formed between the curing layer and the release film, separation of the curing layer and the bottom of the material groove can be accelerated, and the printing efficiency is improved.

Description

[0001] This application is a divisional application. The application date of the original application is August 30, 2024. The application number is 2024112032628. The name of the invention is: A UV 3D printing device and a UV 3D printing method. Technical Field

[0002] The invention relates to 3D printing technology, and in particular to a modeling platform component for an ultraviolet light 3D printing device. Background Art

[0003] 3D printing technology is a method of constructing objects by printing layer by layer. The ultraviolet or visible light photocuring technology is to form a surface by slicing the cross-sectional pattern of the three-dimensional model, forming an image beam and projecting it onto the photosensitive resin printing material to achieve single-layer curing, and then cure and stack the layers to form a three-dimensional model.

[0004] In the process of printing the three-dimensional model layer by layer, after one layer is cured, it needs to be lifted by the printing platform so that the completed printed layer is separated from the bottom of the material tank. In order to reduce the adhesion, a release film is usually set at the bottom of the container. However, even after the release film is set, the adhesion between the cured layer and the release film is still large. Therefore, in order to facilitate the separation between the cured layer and the release film, multiple air flows or liquids are usually introduced between the release film and the transparent plate, so that the release film has multiple protrusions upward to facilitate the separation of the cured layer and the release film. However, this method requires that after the separation of the cured layer and the release film is completed, the air flow or liquid is completely extracted by vacuum so that the release film and the light-transmitting plate are completely attached to ensure that the curing light can pass through the light-transmitting plate and the release film to cure the photosensitive resin. However, in the actual operation process of this technology, some gas or liquid will be retained between the release film and the light-transmitting plate to form air pockets or liquid pockets, which will cause a certain consumption of the curing light and affect the curing of the photosensitive resin. Summary of the invention

[0005] In order to solve the above problems, the present application proposes a modeling platform assembly for an ultraviolet 3D printing device, which includes a printing platform, a guide mechanism and a hollow shaft torque motor; the transmission mechanism of the ultraviolet 3D printing device has a suspension rod extending in a vertical direction, and the modeling platform assembly can be installed on the suspension rod. When the modeling platform assembly is installed on the suspension rod, the suspension rod can drive the modeling platform assembly to reciprocate in the vertical direction;

[0006] The printing platform can be installed at the lower end of the suspension rod. When the printing platform is installed at the lower end of the suspension rod, the lower surface of the printing platform forms a working surface.

[0007] The printing platform can be installed on the lower end of the suspension rod via a ball joint bearing. When the printing platform is installed on the lower end of the suspension rod, the ball head of the ball joint bearing is fixedly installed on the lower end of the suspension rod via the first upper connecting rod, and the ball socket of the ball joint bearing is fixedly installed on the printing platform via the first lower connecting rod;

[0008] The guide mechanism includes a guide member and a limit assembly, the guide member is used to be installed on the suspension rod and is located above the printing platform, at least three limit assemblies are installed on the upper side of the printing platform, each limit assembly includes a rolling bearing, the outer ring of the rolling bearing is fixedly installed on the printing platform via a mounting rod, the inner ring of the rolling bearing is connected to a second upper connecting rod, the second upper connecting rod slides upward through the guide hole on the guide member, and a guide hole is provided corresponding to each second upper connecting rod;

[0009] The hollow shaft torque motor comprises a stator and a mover rotatably mounted on the outside of the stator, the stator can be fixedly mounted on the suspension rod, the central axis of the hollow shaft torque motor extends in the vertical direction, and the hollow shaft torque motor is coaxially arranged with the first upper connecting rod; the at least three limit assemblies are evenly spaced and arranged around the central axis of the hollow shaft torque motor; the hollow shaft torque motor is a servo motor;

[0010] A driving ring is fixedly installed at the lower end of the mover, the driving ring is cylindrical and is coaxially arranged with the hollow shaft torque motor, and the lower end of the driving ring forms a driving end; a driving surface is formed on the upper surface of the printing platform, the driving surface is inclined, and the driving end is pressed against the driving surface; when the mover drives the drive to rotate around the central axis of the hollow shaft torque motor, the driving ring can drive the printing platform to swing with the ball center of the ball joint bearing as the center point and the central axis of the hollow shaft torque motor as the center line; each second upper connecting rod can only swing along the radial direction of the hollow shaft torque motor;

[0011] The printing platform has a working position. When the printing platform is located at the working position, the working surface of the printing platform is horizontally arranged, the first upper connecting rod and the first lower connecting rod are coaxially arranged, and the mounting rod of the limiting assembly extends in the vertical direction.

[0012] The transmission mechanism is specifically installed on a workbench of the ultraviolet 3D printing device. A material trough is installed on the workbench, and an ultraviolet light system is installed inside the workbench. The ultraviolet light system includes a liquid crystal screen fixed on the top plate of the workbench. The material trough is located above the liquid crystal screen, and the ultraviolet light emitted by the ultraviolet light system can irradiate the liquid crystal screen.

[0013] When the present application is installed on the ultraviolet 3D printing device, due to the inclined driving surface, when the mover of the hollow shaft torque motor drives the driving ring to rotate, the printing platform can be swung, and the working surface of the printing platform can be swung in the order of horizontal-inclined-horizontal, so that the working surface of the printing platform can drive the solidified layer to tilt relative to the horizontal plane, resulting in an angle between the solidified layer and the release film, and as the printing platform swings, the angle gradually expands, so that the solidified layer is quickly separated from the bottom of the material tank. And during the swinging process of the printing platform, the direction of the angle will rotate synchronously around the central axis of the hollow shaft torque motor with the rotation of the mover, and during the swinging process of the printing platform, the angle will gradually increase with the rotation of the mover, and reach a maximum value, and then gradually decrease until the working surface of the printing platform is set horizontally again. That is, the present application can use the swinging of the printing platform to improve the separation efficiency of the solidified layer and the material tank, thereby improving the printing efficiency.

[0014] During the swinging of the printing platform, the maximum value of the angle between the solidified layer and the bottom of the trough is twice the angle between the driving surface and the horizontal plane.

[0015] Since the hollow shaft torque motor used in the present application is a servo motor, its rotation angle can be accurately controlled, so that after the mover of the hollow shaft torque motor rotates one circle, the working surface of the printing platform is restored to a horizontal state, thereby restoring the lower surface of the solidified layer to a horizontal state, so as to ensure the printing quality of the product model.

[0016] Since the present application utilizes a driving ring to swing the printing platform, when the solidified layer is peeled off from the release film from one side and a gap appears, the gap will also extend along the circumference of the solidified layer and gradually expand as the driving ring rotates.

[0017] Furthermore, in order to make the driving ring form a stable pressure on the driving surface, the lower end surface of the driving end of the driving ring is an inclined surface, and the lower end surface of the driving end is parallel to the driving surface of the printing platform. This design can make the lower end surface of the driving end always completely press against the driving surface of the printing platform, avoiding uncontrolled swinging of the printing platform.

[0018] Furthermore, in order to reduce the friction between the driving ring and the driving surface, a universal ball head is installed on the driving end of the driving ring, and the driving end is pressed against the driving surface through the universal ball head.

[0019] Furthermore, in order to prevent the printing platform from being displaced in the horizontal direction during the swinging process, the ball center of the ball joint bearing is located within the driving surface. Although the horizontal displacement of the printing platform is conducive to the peeling between the solidified layer and the release film, it will also cause the unfinished model to be subjected to horizontal thrust, which is easy to cause the model to bend or break. This design allows the printing platform to only swing without moving in the horizontal direction.

[0020] Specifically, when the printing platform is in the working position, the angle between the driving surface and the horizontal plane is 0.2-3°. The above angle can be selected according to the size of the cross section of the product model. When the cross section of the product model is large, the above angle is small, that is, the solidified layer of the product model and the release film are facing the same side to generate a large distance, thereby separating the solidified layer from the release film.

[0021] Furthermore, the guide hole is a long hole extending in the radial direction of the hollow shaft torque motor. When the mover drives the drive to rotate around the central axis of the hollow shaft torque motor, the second upper connecting rod will move in the radial direction of the hollow shaft torque motor. After the guide hole is set as a long hole extending in the radial direction of the hollow shaft torque motor, it can be ensured that the second upper connecting rod moves smoothly in the guide hole along the radial direction of the hollow shaft torque motor, thereby ensuring the smooth swinging of the printing platform.

[0022] Furthermore, to prevent the second upper connecting rod from tilting along the circumferential direction of the hollow shaft torque motor, the guide hole is configured to only enable the second upper connecting rod to move radially of the hollow shaft torque motor and not to enable the second upper connecting rod to move circumferentially relative to the hollow shaft torque motor.

[0023] The steps of the ultraviolet 3D printing method using the ultraviolet 3D printing device equipped with any of the above-mentioned modeling platform components are as follows:

[0024] (1) The printing platform is placed in the working position, and the transmission mechanism is started to immerse the printing platform in the photosensitive resin in the material tank, and the first solidified layer is printed on the working surface of the printing platform;

[0025] (2) lifting the printing platform upward, and then starting the hollow shaft torque motor to rotate the mover one circle. Driven by the drive ring, the printing platform swings with the ball center of the ball joint bearing as the center point and the central axis of the hollow shaft torque motor as the center line, so that the first solidified layer is separated from the release film, and the first solidified layer and the release film reach a first set distance, which is greater than the thickness of one solidified layer;

[0026] During the swinging process of the printing platform, the working surface will form an angle with respect to the horizontal plane, and the direction of the angle will rotate around the central axis of the hollow shaft torque motor as the mover rotates, and during the swinging process of the printing platform, the angle will gradually increase as the mover rotates, reach a maximum value, and then gradually decrease until the working surface of the printing platform is set horizontally again;

[0027] (3) lowering the printing platform so that the distance between the first solidified layer and the release film reaches the thickness of one solidified layer, and then completing the printing of the second solidified layer;

[0028] (4) Repeat steps (2) and (3) until the product model is printed.

[0029] In the UV 3D printing method, an inclined driving surface is utilized. When the mover of the hollow shaft torque motor drives the driving ring to rotate, the printing platform can be swung, so that the working surface of the printing platform can be tilted relative to the horizontal plane, thereby causing the solidified layer on the working surface to be tilted relative to the horizontal plane, resulting in an angle between the solidified layer and the release film. The angle causes the bonding surface between the release film and the solidified layer to gradually separate from one side to the other, thereby overcoming the problem of large bonding force between the solidified layer and the release film. As the printing platform swings, the angle gradually expands, thereby causing the solidified layer to separate quickly from the release film. When the angle reaches the maximum, as the printing platform continues to swing, the working surface of the printing platform gradually returns to a horizontal state.

[0030] Specifically, in order to prevent the downwardly moving end of the printing platform from squeezing the product model and causing damage to the product model when the printing platform swings, in step (2), after the printing platform is lifted up for 0.5-2 seconds, the hollow shaft torque motor is started before the distance between the first solidified layer and the release film reaches the first set distance. Alternatively, in step (2), the hollow shaft torque motor is started when the distance between the first solidified layer and the release film reaches the first set distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an embodiment of the present invention, specifically a state diagram when the printing platform is in the working position.

[0032] Figure 2 This is a diagram showing the state when the release film and the solidified layer are partially separated.

[0033] Figure 3 This is a diagram showing the state when the release film and the cured layer are completely separated.

[0034] Figure 4 It is a structural diagram of the modeling platform components. DETAILED DESCRIPTION

[0035] See also Figure 1-Figure 4 A UV 3D printing device includes a workbench 11, on which a transmission mechanism is installed. The transmission mechanism adopts existing mature technology. The transmission mechanism includes a vertical rod 12 fixed on the workbench 11 and a ball screw 13 rotatably installed on one side of the vertical rod. The ball screw 13 extends in the vertical direction, and one end of a connecting arm 14 is engaged with the ball screw through a screw hole. The connecting arm 14 extends in the horizontal direction, and a suspension rod 15 is fixedly installed on one end of the connecting arm 14 away from the ball screw. The suspension rod extends in the vertical direction and is cylindrical.

[0036] A modeling platform assembly 700 is installed on the suspension rod 15, and a driving motor is installed at the lower end of the ball screw, which is fixedly installed on the vertical rod. The driving motor can drive the ball screw to rotate, so that the connecting arm can drive the modeling platform assembly to move back and forth in the vertical direction. An ultraviolet light system is installed in the workbench, and the ultraviolet light system includes a liquid crystal screen fixed on the top plate of the workbench. The ultraviolet light system is not shown in the attached drawings. The ultraviolet light system adopts existing mature technology and will not be described in detail. The lower surface of the printing platform is formed as a working surface.

[0037] The printing platform 31 is installed at the lower end of the suspension rod, and the lower surface of the printing platform 31 forms a working surface 34. The printing platform 31 is specifically movably installed at the lower end of the suspension rod 15 via a ball joint bearing 40, a ball head 43 of the ball joint bearing 40 is fixedly installed at the lower end of the suspension rod via a first upper connecting rod 42, and a ball socket 44 of the ball joint bearing is fixedly installed on the printing platform via a first lower connecting rod 41. The first lower connecting rod 41 and the first upper connecting rod 42 are both screwed onto the printing platform and the suspension rod respectively by means of threads.

[0038] The guide mechanism includes a guide member 61 and a limit assembly 50. The guide member 61 is installed on the suspension rod and is located above the printing platform 31. Three limit assemblies 50 are installed on the upper side of the printing platform. Each limit assembly 50 includes a rolling bearing 53. The outer ring of the rolling bearing is fixedly installed on the printing platform through a mounting rod 51. The rotating shaft 54 ​​is fixedly installed on the inner ring of the rolling bearing. A second upper connecting rod 52 is fixedly installed on the rotating shaft. The second upper connecting rod 52 slides upward through the guide hole 62 on the guide member. A guide hole is provided for each second upper connecting rod. A guide hole 62 is provided for each second upper connecting rod 52. The mounting rod 51 is screwed on the printing platform in a threaded manner. Each second upper connecting rod can only swing along the radial direction of the hollow shaft torque motor 70 described below. In this embodiment, the rolling bearing 53 specifically adopts a double-row angular contact ball bearing.

[0039] The hollow shaft torque motor 70 is installed on the hanger 15. The hollow shaft torque motor 70 includes a stator 75 and a mover 71 rotatably mounted on the outside of the stator 75. A hollow shaft 76 is fixedly lined inside the stator. The top of the hollow shaft 76 is fixedly connected to a flange 151 on the hanger 15 by bolts. The flange 151 is formed by the outer peripheral surface of the hanger protruding radially outward. In order to ensure the connection stability between the hollow shaft and the hanger, a key 77 is provided between the hollow shaft and the hanger so that the stator is fixed to the hanger through the hollow shaft.

[0040] An upper end cover 72 and a lower end cover 73 are respectively installed at the upper and lower ends of the mover 71, wherein the upper end cover 72 is connected to the upper flange 711 at the upper end of the mover 71 by bolts, and the lower end cover 73 is connected to the lower flange 712 at the lower end of the mover 71 by bolts, and the upper flange 711 and the lower flange 712 are both integrally formed on the mover 71.

[0041] In this embodiment, an upper connecting flange 16 is provided on the outer peripheral surface of the hollow shaft 76, and the upper end cover has an upper abutting flange 721 protruding inwardly, and the lower surface of the upper abutting flange 721 is a step surface facing downward. The upper abutting flange 721 is pressed against the upper side of the outer ring of the upper angular contact bearing 18 through its lower surface, and the upper connecting flange 16 is pressed against the lower side of the inner ring of the upper angular contact bearing, so that the upper end cover is rotatably connected to the hollow shaft 76 through the upper angular contact bearing.

[0042] A lower step portion 17 is provided at the lower end of the hollow shaft 76, and the lower step portion has a step surface facing downward, and the lower step portion 17 is formed by the outer peripheral surface of the hollow shaft 76 being recessed radially inward; the lower end cover has a lower abutting flange 731 protruding inward, and the upper surface of the lower abutting flange 731 is a step surface facing upward, and the lower abutting flange 731 abuts against the lower side of the outer ring of the lower angular contact bearing 19 through its upper surface, and the lower step portion 17 abuts against the lower side of the inner ring of the lower angular contact bearing, so that the lower end cover is rotatably connected to the hollow shaft 76 through the lower angular contact bearing. A winding 74 is provided on the inner side of the stator. The structure of the hollow shaft torque motor can be completed by using existing mature technology, and no further description is given.

[0043] The central axis of the hollow shaft torque motor extends in the vertical direction, the hollow shaft torque motor is coaxially arranged with the first upper connecting rod, and the hollow shaft torque motor is a servo motor. Three limit assemblies 50 are evenly spaced around the central axis of the hollow shaft torque motor 70 .

[0044] A drive ring 78 is fixedly mounted on the lower side of the lower end cover 73. The drive ring 78 is cylindrical and is coaxially arranged with the hollow shaft torque motor. An integrally formed flange 781 is provided at the upper end of the drive ring 78. The flange 781 is fixedly connected to the lower side of the lower end cover 73 by bolts, thereby fixing the drive ring on the lower end cover.

[0045] A driving platform 32 is formed on the upper surface of the printing platform 31. The driving platform 32 is formed by the upper surface of the printing platform 31 protruding upward. The upper surface of the driving platform 32 is formed as a driving surface 33. The driving surface 33 is inclined. The driving end is pressed against the driving surface. The ball center 45 of the ball head 43 of the ball joint bearing is located in the driving surface. For clear display, Figure 3 In the figure, the center 45 of the ball head 43 is represented by a small circle.

[0046] In this embodiment, the lower end surface of the driving end of the driving ring is an inclined surface, and the lower end surface of the driving end is parallel to the driving surface of the printing platform. It can be understood that in order to reduce the friction between the driving end and the driving surface, in another embodiment, a universal ball head 79 can be installed on the lower end surface of the driving end, and the driving end is pressed against the driving surface 33 through the universal ball head 79.

[0047] In this embodiment, when the printing platform is in the working position, the angle α between the driving surface and the horizontal plane is 2°. It can be understood that in other embodiments, the angle α can also be 0.2°, 0.5°, 0.8°, 1.2°, 1.5°, 2° or 3°.

[0048] When the mover drives the drive to rotate around the central axis of the hollow shaft torque motor, the drive ring can drive the printing platform to swing with the ball center 45 of the ball head 43 of the ball head joint bearing as the center point and the central axis of the hollow shaft torque motor as the center line.

[0049] When the mover drives the driving wheel to rotate around the central axis of the hollow shaft torque motor, the second upper connecting rod will move in the radial direction of the hollow shaft torque motor. To ensure that the second upper connecting rod moves smoothly in the radial direction of the hollow shaft torque motor in the guide hole 62, in this embodiment, the guide hole is a long hole extending in the radial direction of the hollow shaft torque motor, and the guide hole is configured to only enable the second upper connecting rod to move in the radial direction of the hollow shaft torque motor, and not enable the second upper connecting rod to move circumferentially relative to the hollow shaft torque motor.

[0050] The printing platform has a working position. When the printing platform is located at the working position, the working surface of the printing platform is horizontally arranged, the first upper connecting rod and the first lower connecting rod are coaxially arranged, and the mounting rod of the limiting assembly extends in the vertical direction.

[0051] See also Figure 4 For the convenience of description, when the printing platform is located at the working position, the two opposite ends of the printing platform are respectively referred to as the first side portion 311 and the second side portion 312 according to the direction from high to low of the driving surface 33. Figure 4In FIG. 3 , the direction of arrow X indicates the direction from high to low of the driving surface 33 . The first side portion 311 is located at the low side end of the driving surface 33 , and the second side portion 312 is located at the high side end of the driving surface 33 .

[0052] When the hollow shaft torque motor drives the printing platform to swing, the first side portion 311 will first move upward until it moves to the highest point, and then move downward until the working surface is restored to a horizontal state; at the same time, the second side portion 312 will first move downward until it moves to the lowest point, and then move upward until the working surface is restored to a horizontal state; in this process, with the line connecting the first side portion and the second side portion as the dividing line, the area of ​​the printing platform on one side of the dividing line will first move downward, and then move upward, until the working surface is restored to a horizontal state, and the area of ​​the printing platform on the other side of the dividing line will first move upward, and then move downward, until the working surface is restored to a horizontal state. Figure 1 In the printing platform, it is located at the working position. Figure 2 In the figure, the first side portion 311 moves upward to the highest point, and the second side portion 312 moves downward to the lowest point. Both the highest point and the lowest point are relative to the center of the ball head of the ball joint bearing. At this time, the working surface of the printing platform is in the maximum tilt state.

[0053] A material trough 21 is installed on the workbench, and a release film 22 is installed at the bottom of the material trough. The material trough is located above the liquid crystal screen, and the ultraviolet light emitted by the ultraviolet light system can irradiate the liquid crystal screen.

[0054] Observing along the vertical direction, in this embodiment, the rotor of the hollow shaft torque motor rotates in the counterclockwise direction. When a gap 90 appears between the side of the solidified layer facing the first side portion and the release film, the gap will also gradually extend in the counterclockwise direction as the rotor rotates, and the distance between the side of the solidified layer facing the first side portion and the release film will gradually increase.

[0055] The following is an explanation of the ultraviolet 3D printing method in the present application. The ultraviolet 3D printing method is performed using the above-mentioned ultraviolet 3D printing device. The ultraviolet 3D printing method includes the following steps:

[0056] (1) The printing platform is placed in the working position, and the transmission mechanism is started to immerse the printing platform into the photosensitive resin in the material tank, and the first solidified layer 80 is printed on the working surface of the printing platform.

[0057] (2) Lift the printing platform upward, and then start the hollow shaft torque motor to make the mover rotate one circle. Driven by the drive ring, the printing platform swings with the center of the ball head of the ball joint bearing as the center point and the central axis of the hollow shaft torque motor as the center line, so that the first solidified layer is separated from the release film, and the first solidified layer and the release film reach a first set distance, which is greater than the thickness of one solidified layer.

[0058] During the swinging process of the printing platform, the working surface will form an angle relative to the horizontal plane. The direction of the angle will rotate around the central axis of the hollow shaft torque motor as the mover rotates. During the swinging process of the printing platform, the angle will gradually increase as the mover rotates, reach a maximum value, and then gradually decrease until the working surface of the printing platform is set horizontally again.

[0059] When the working surface forms an angle with the horizontal plane, the first solidified layer will form a V-shaped gap of 90 degrees with the release film. The direction of the gap will rotate synchronously with the above angle and gradually increase until the first solidified layer is completely separated from the release film. For details, please refer to Figure 2 and Figure 3 .

[0060] (3) lowering the printing platform so that the distance between the first solidified layer and the release film reaches the thickness of one solidified layer, and then completing the printing of the second solidified layer;

[0061] (4) Repeat steps (2) and (3) until the product model is printed.

[0062] In this embodiment, after the printing platform is lifted upward for 1 second, the hollow shaft torque motor is started again. At this time, the distance between the first solidified layer and the release film has not yet reached the first set distance. Due to the swing of the printing platform, the working surface 34 of the printing platform is inclined relative to the horizontal plane, so that the first solidified layer can form a gap 90 between the side facing the first side and the release film. As the printing platform continues to rise and the printing platform continues to swing, the direction of the gap 90 rotates synchronously around the central axis of the hollow shaft torque motor with the rotation of the mover and gradually expands until the first solidified layer and the release film are continuously peeled off until they are completely peeled off. After the hollow shaft torque motor rotates one circle, the working surface returns to a horizontal state.

[0063] Since the angle α between the driving surface and the horizontal plane is 1°, during the swinging process of the printing platform, the angle between the working surface and the horizontal plane can reach a maximum of 2°.

[0064] It can be understood that in another embodiment, in step (2), when the first solidified layer and the release film reach a first set distance, the hollow shaft torque motor can be started to tilt the first solidified layer relative to the horizontal plane and completely peel off the first solidified layer from the release film.

Claims

1. A modeling platform assembly for an ultraviolet 3D printing device, characterized in that: The invention comprises a printing platform, a guide mechanism and a hollow shaft torque motor; the transmission mechanism of the ultraviolet 3D printing device has a suspension rod extending in a vertical direction, the modeling platform assembly can be installed on the suspension rod, and when the modeling platform assembly is installed on the suspension rod, the suspension rod can drive the modeling platform assembly to reciprocate in the vertical direction; The printing platform can be installed at the lower end of the suspension rod. When the printing platform is installed at the lower end of the suspension rod, the lower surface of the printing platform forms a working surface. The printing platform can be installed on the lower end of the suspension rod via a ball joint bearing. When the printing platform is installed on the lower end of the suspension rod, the ball head of the ball joint bearing is fixedly installed on the lower end of the suspension rod via the first upper connecting rod, and the ball socket of the ball joint bearing is fixedly installed on the printing platform via the first lower connecting rod; The guide mechanism includes a guide member and a limit assembly, the guide member is used to be installed on the suspension rod and is located above the printing platform, at least three limit assemblies are installed on the upper side of the printing platform, each limit assembly includes a rolling bearing, the outer ring of the rolling bearing is fixedly installed on the printing platform via a mounting rod, the inner ring of the rolling bearing is connected to a second upper connecting rod, the second upper connecting rod slides upward through the guide hole on the guide member, and a guide hole is provided corresponding to each second upper connecting rod; The hollow shaft torque motor comprises a stator and a mover rotatably mounted on the outside of the stator, the stator can be fixedly mounted on the suspension rod, the central axis of the hollow shaft torque motor extends in the vertical direction, and the hollow shaft torque motor is coaxially arranged with the first upper connecting rod; the at least three limit assemblies are evenly spaced and arranged around the central axis of the hollow shaft torque motor; the hollow shaft torque motor is a servo motor; A driving ring is fixedly installed at the lower end of the mover, the driving ring is cylindrical and is coaxially arranged with the hollow shaft torque motor, and the lower end of the driving ring forms a driving end; a driving surface is formed on the upper surface of the printing platform, the driving surface is inclined, and the driving end is pressed against the driving surface; when the mover drives the drive to rotate around the central axis of the hollow shaft torque motor, the driving ring can drive the printing platform to swing with the ball center of the ball joint bearing as the center point and the central axis of the hollow shaft torque motor as the center line; each second upper connecting rod can only swing along the radial direction of the hollow shaft torque motor; The printing platform has a working position. When the printing platform is located at the working position, the working surface of the printing platform is horizontally arranged, the first upper connecting rod and the first lower connecting rod are coaxially arranged, and the mounting rod of the limiting assembly extends in the vertical direction.

2. The modeling platform assembly according to claim 1, characterized in that: The lower end surface of the driving end of the driving ring is an inclined surface, and the lower end surface of the driving end is parallel to the driving surface of the printing platform.

3. The modeling platform assembly according to claim 1, characterized in that: A universal ball head is installed on the driving end of the driving ring, and the driving end is pressed against the driving surface through the universal ball head.

4. The modeling platform assembly according to claim 1, characterized in that: The center of the ball head of the ball joint bearing is located in the driving surface.

5. The modeling platform assembly according to claim 1, characterized in that: When the printing platform is in the working position, the angle between the driving surface and the horizontal plane is 0.2-3°.

6. The modeling platform assembly according to claim 1, characterized in that: The guide hole is a long hole extending in the radial direction of the hollow shaft torque motor.

7. The modeling platform assembly according to claim 1, characterized in that: The guide hole is configured to enable the second upper connecting rod to move only in the radial direction of the hollow shaft torque motor and to prevent the second upper connecting rod from moving in the circumferential direction relative to the hollow shaft torque motor.

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