Synchronous driving mechanism of material tank and liquid crystal screen of pull-up type light-cured 3D printer

Abstract

The application discloses a synchronous driving mechanism for a material tank and a liquid crystal screen of a pull-up type light-curing 3D printer. The outer ring of a rotary support is fixed on a workbench, and a lifting pipe is threadedly engaged on the inner side of the inner ring and can only reciprocate in the vertical direction. A sleeve is fixed on the outer ring, a material tank is threadedly engaged on the outer ring, and a guide rod on the inner ring is slidingly arranged in a guide hole of the material tank. When the inner ring rotates, the material tank reciprocates between a first working position and a second working position, and the lifting pipe reciprocates between a third working position and a fourth working position. When the material tank is located at the first working position and the lifting pipe is located at the third working position, printing work can be carried out. When the material tank is located at the second working position and the lifting pipe is located at the fourth working position, a release film and a product model on a printing platform are in a separated state. The application further discloses a light-curing 3D printing method. The application reduces the up-and-down moving distance and speed of the printing platform by lowering the material tank, reduces the wear of a ball screw and a screw nut, and prolongs the service life of the equipment.

Description

[0001] The present application is a divisional application, the original application has a filing date of November 22, 2024, an application number of 2024116767290, and an invention title of: A pull-up type light-curing 3D printer and a light-curing 3D printing method. TECHNICAL FIELD

[0002] The present application relates to a pull-up type light-curing 3D printer tank and liquid crystal screen synchronous driving mechanism. BACKGROUND

[0003] When printing is performed using a pull-up type light-curing 3D printing technology, the light source system irradiates the photosensitive material in the gap between the printing platform and the release film, causing the photosensitive material to solidify and adhere to the printing platform, forming a solidified layer. When the production of a solidified layer is completed, the printing platform is raised, and a gap is formed again between the solidified layer and the release film, and the next solidified layer is formed. The printing platform is raised again to continuously form a new solidified layer until the desired product model is completed. Due to the adhesion between the solidified layer and the release film, the difficulty of lifting the printing platform is increased, resulting in a decrease in printing efficiency. To improve printing efficiency, the tank is usually oscillated or rotated to accelerate the separation of the solidified layer and the release film.

[0004] Although the oscillation method can accelerate the separation of the solidified layer and the release film, the photosensitive resin is prone to spill out of the tank in the inclined state. To prevent the overflow of photosensitive resin, the depth of the tank needs to be increased or the liquid capacity of the tank needs to be reduced. At the same time, due to the oscillation, the contact area between the photosensitive resin and the air is enlarged, which easily causes air to mix into the photosensitive resin, affecting the printing quality of the product model.

[0005] Although the rotation method can also accelerate the separation of the solidified layer and the release film, the separation of the solidified layer and the release film can only be completed by lifting the printing platform during the separation process. Since the printing platform needs to move back and forth at least several dozen times when printing each product model, and taking a commonly used single solidified layer thickness of 0.05mm as an example, a product model with a height of 10mm needs to be printed at least 200 times. The frequent reciprocating motion of the printing platform easily causes wear and tear to the ball screw and screw nut, resulting in a decrease in printing accuracy and a reduction in the service life of the printing equipment.

[0006] Therefore, how to accelerate the separation speed of the solidified layer and the release film while ensuring the quality of the product model, improve the printing efficiency, reduce the degree of wear and tear of the ball screw, and prolong the service life of the printing equipment, is still a problem that needs to be solved in the development of pull-up type light-curing 3D technology. SUMMARY

[0007] To at least solve the above-mentioned problems, the application first provides a pull-up type light-curing 3D printer tank and liquid crystal screen synchronous driving mechanism, which comprises a rotary support and a driving motor installed on the top plate of the workbench; the driving motor is a servo motor;

[0008] The rotary support comprises an outer ring and an inner ring combined by balls, the central axis of the rotary support extends in the vertical direction, the outer ring is fixed on the workbench, the output shaft of the driving motor is connected to the inner ring, and the driving motor can drive the inner ring to rotate; a lifting pipe is threadedly engaged on the inner side of the inner ring, the lifting pipe is limited to reciprocate only in the vertical direction and cannot rotate relative to the outer ring, and a liquid crystal screen is installed on the top of the lifting pipe;

[0009] A limiting groove extending in the vertical direction is arranged on the outer peripheral surface of the lifting pipe, and a limiting piece is fixedly installed on the workbench and inserted into the limiting groove;

[0010] A sleeve is fixed on the outer ring, the sleeve is coaxially arranged with the inner ring, the tank has a circular annular tank wall, a release film is installed on the bottom of the tank wall, the tank wall is threadedly engaged on the inner side of the sleeve, a guide hole extending in the vertical direction is arranged in the tank wall, and a guide rod is fixedly installed on the inner ring and slidingly penetrates into the guide hole;

[0011] The tank has a first working position and a second working position, the lifting pipe has a third working position and a fourth working position, when the tank is located at the first working position, the lifting pipe is located at the third working position, when the tank is located at the second working position, the lifting pipe is located at the fourth working position, when the driving motor drives the inner ring to rotate, the tank can reciprocate between the first working position and the second working position, and the lifting pipe can reciprocate between the third working position and the fourth working position at the same time;

[0012] When the tank is located at the first working position and the lifting pipe is located at the third working position, printing work can be carried out, when the tank is located at the second working position and the lifting pipe is located at the fourth working position, the release film is in a separated state from the product model on the printing platform. Since the tank rotates while moving up and down, the peeling speed of the cured layer and the release film can be improved. Since the tank moves downward at the same time when the cured layer and the release film are peeled, the lifting height of the printing platform can be reduced. Since the printing platform is engaged with the ball screw nut on the ball screw, the wear of the ball screw and the ball screw nut can be reduced, so that the service life of the equipment can be improved while the peeling speed of the cured layer and the release film is improved.

[0013] In specific use, the descending height of the trough and the liquid crystal screen can be flexibly adjusted as required, so as to reasonably distribute the moving distance of the printing platform and the moving distance of the trough and the liquid crystal screen in the vertical direction, to minimize the wear of the ball screw and the screw nut, and to improve the service life of the equipment.

[0014] Further, to avoid the influence of the limiting piece on the printing operation, one end of the limiting piece is detachably fixed to the lower surface of the top plate, and the other end of the limiting piece extends into the limiting groove. The limiting piece is installed on the lower surface of the top plate, so that the limiting piece is located in the inner cavity of the workbench, which can effectively avoid the influence of the limiting piece on the printing operation.

[0015] Specifically, to enable the trough to be as close to the liquid crystal screen as possible, the upper surface of the liquid crystal screen is not lower than the upper end surface of the lifting pipe upwardly.

[0016] Further, a light-transmitting glass is arranged at the bottom of the trough, and the release film is arranged on the light-transmitting glass; when the trough is located at the first working position and the lifting pipe is located at the third working position, the distance between the light-transmitting glass and the liquid crystal screen is 0.2-1mm. This design can avoid that the release film is directly supported on the liquid crystal screen. When the release film is directly supported on the liquid crystal screen, the release film will rub against the liquid crystal screen when the trough rotates, and after frequent rubbing, the light transmission of the liquid crystal screen will be reduced, and the photocuring efficiency will be reduced. The light-transmitting glass is used to support the release film, and the light-transmitting glass is arranged in a spaced manner with the liquid crystal screen, which can effectively avoid the mutual friction between the light-transmitting glass and the liquid crystal screen when the trough rotates, so that the light transmission of the light-transmitting glass and the liquid crystal screen is reduced at the same time, thereby reducing the photocuring efficiency.

[0017] Further, the printing platform has a central axis extending in the vertical direction, and the central axis of the printing platform has a distance from the central axis of the trough in the horizontal direction. Preferably, the distance between the central axis of the printing platform and the central axis of the trough is 5-15mm. This design can make the bonding area of the cured layer and the release film move relatively when the trough rotates, so that the cured layer and the release film can be smoothly peeled off. When the central axis of the printing platform coincides with the central axis of the trough, when the trough rotates, the area of the release film located on the central axis will not move relatively with the cured layer, and will also produce vortex-like twisting with the central axis of the release film as the central axis, which will accelerate the failure of the release film.

[0018] Further, the pitch of the inner thread of the sleeve is the same as the pitch of the inner thread of the inner ring; or the pitch of the inner thread of the sleeve is smaller than the pitch of the inner thread of the inner ring. When the pitch of the inner thread of the sleeve is the same as the pitch of the inner thread of the inner ring, the lifting speed of the trough is the same as the lifting speed of the lifting tube when the inner ring rotates, and the collision between the LCD screen and the trough can be effectively avoided. When the pitch of the inner thread of the sleeve is smaller than the pitch of the inner thread of the inner ring, because the initial position of the trough is at the first working position and the initial position of the lifting tube is at the third working position when working, and then the trough and the lifting tube move according to the sequence of descending-ascending-descending-ascending, the LCD screen on the trough and the lifting tube will not collide together due to the lifting speed of the lifting tube being greater than the lifting speed of the trough. However, in order to avoid the collision between the trough and the LCD screen due to misoperation, it is recommended to preferentially adopt the scheme that the pitch of the inner thread of the sleeve is the same as the pitch of the inner thread of the inner ring. In order to synchronize the downward or upward movement of the trough and the lifting tube, the screw direction of the inner thread of the sleeve is opposite to the screw direction of the inner thread of the inner ring.

[0019] Specifically, a gear is installed on the output shaft of the driving motor, and an outer gear is installed on the lower part of the inner ring, and the gear is engaged with the outer gear; or a first pulley is installed on the output shaft of the driving motor, and a second pulley is arranged on the lower part of the inner ring, and the first pulley is wrapped around the first pulley and the second pulley through a belt. The two driving modes of the driving motor to rotate the inner ring have no advantages and disadvantages, and can be selected according to specific needs.

[0020] When the up-pulling type light-curing 3D printer provided with any one of the trough and LCD screen synchronous driving mechanisms is installed, the light-curing 3D printing method thereof includes the following steps:

[0021] (1) Adjust the positions of the trough and the lifting tube, so that the trough is located at the first working position and the lifting tube is located at the third working position; immerse the printing platform into the photosensitive resin in the trough, so that the printing platform has a gap with the release film of a solidified layer thickness, and complete the printing of the first solidified layer;

[0022] (2) Lift the printing platform upward, make the driving motor rotate forward, the trough rotates downward to the second working position, and the lifting tube moves downward to the fourth working position synchronously, and complete the peeling of the first solidified layer from the release film;

[0023] (3) Reverse the driving motor, the trough rotates upward to the first working position, and the lifting tube moves upward to the third working position synchronously, lower the printing platform, so that the first solidified layer has a gap with the release film of a solidified layer thickness, and complete the printing of the second solidified layer;

[0024] (4) Repeat steps (2) and (3), continue to print the solidified layer until the printing of the product model is completed.

[0025] In the printing process of the product model, after the printing of each solidified layer is completed, the inner ring is rotated by the driving motor, so that the trough is lowered from the first working position to the second working position, the lifting pipe is lowered from the third working position to the fourth working position, and the trough rotates during the lowering process, thereby accelerating the separation speed of the solidified layer and the release film. After the separation of the solidified layer and the release film is completed, the trough is lifted upward at the same time as the printing platform is lowered. Since the reciprocating distance of the screw nut on the ball screw can be reduced, the wear between the screw nut and the ball screw can be reduced, and the service life of the equipment can be improved.

[0026] Specifically, the number of rotations of the trough is ≥0.2 rotations. The number of rotations of the trough does not need to exceed 1 rotation, and the number of rotations of the trough is controlled to be 0.2-1 rotation, more preferably 0.2-0.6 rotation. When the trough rotates to a certain number of rotations, the product model and the release film have been separated, and too many rotations are of no benefit to the separation of the product model and the release film. When the trough rotates, the height of the trough is controlled to be 2-5 mm, and the separation height of the product model and the release film is generally controlled to be 5-10 mm. The application controls the lowering height of the trough to be 20-50% of the separation height of the product model and the release film, which can reduce the reciprocating distance of the screw nut on the ball screw, thereby reducing the wear between the screw nut and the ball screw and improving the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of an embodiment of the application.

[0028] Figure 2 is Figure 1 the view of A-A in

[0029] Figure 3 is Figure 1 another state diagram of the drawing shown. DETAILED DESCRIPTION

[0030] The following first describes the pull-up type photocuring 3D printer in the application, please refer to Figure 1 and Figure 2 The photocuring 3D printer includes a workbench 10, the workbench 10 includes a vertical wall 11 extending in a vertical direction in a rectangular cylindrical shape, a bottom plate 12 installed at the bottom of the vertical wall, and a top plate 13 installed at the top of the vertical wall.

[0031] A transmission mechanism is installed on the workbench, which comprises a column 15, a lifting motor 21 and a ball screw 22. The column 15 is fixedly installed on the top plate of the workbench, the lifting motor 21 is installed at the bottom of the column, the ball screw extends in the vertical direction, one end of the lifting arm 16 is engaged on the ball screw through a screw nut, the other end of the lifting arm extends in the horizontal direction away from the ball screw and forms a free end, and the printing platform 17 is installed on the free end. Under the driving of the lifting motor, the lifting arm 16 can move up and down along the ball screw, and the printing platform moves up and down, and the lifting motor 21 specifically adopts a servo motor, and the specific transmission mechanism can be known from the prior art.

[0032] The slewing bearing 60 comprises an outer ring 62 and an inner ring 61 combined together through balls 63, the outer ring 62 is fixed on the top plate of the workbench through locking bolts 64, and the first central axis 311 of the slewing bearing 60 extends in the vertical direction. Specifically, in the embodiment, in order to reduce the influence of the slewing bearing on the printing work, a stepped hole 19 is formed on the top plate, the stepped hole 19 is large at the top and small at the bottom, so that the stepped hole has a stepped surface 191 facing upward, and the outer ring 62 is fixed on the stepped surface 191. The inner ring extends downward out of the stepped hole, and an outer gear ring 66 is arranged on the outer circumferential surface of the lower part of the inner ring.

[0033] The driving motor 71 is fixedly installed on the stepped surface 191, and the output shaft of the driving motor extends downward out of the top plate and is provided with a gear 72, which is engaged on the outer gear ring. In the embodiment, the outer gear ring is separately processed and then fixed on the inner ring by bolts. It can be understood that in another embodiment, the outer gear ring can also be integrally formed on the inner ring. Through the gear and the outer gear ring, the driving motor can drive the inner ring to rotate.

[0034] It can be understood that in another embodiment, the connection mode of the output shaft of the driving motor and the inner ring can also adopt a belt connection, specifically a first pulley is installed on the output shaft of the driving motor, a second pulley is installed on the lower part of the inner ring, and then a belt is wound around the first pulley and the second pulley, so that the driving motor can drive the inner ring to rotate through the belt. The specific connection mode of the belt can adopt the existing mature technology.

[0035] A first internal thread is arranged on an inner peripheral surface of the inner ring 61, and a first external thread is arranged on an outer wall of the lifting pipe 41. The lifting pipe 41 is engaged with the first external thread on the first internal thread of the inner ring 61, so that the lifting pipe 41 is threadedly engaged on the inner side of the inner ring 61. The lifting pipe 41 is limited to reciprocate only in the vertical direction and cannot rotate relative to the outer ring. In this embodiment, a limiting groove 43 extending in the vertical direction is arranged on an outer peripheral surface of the lifting pipe 41, and a limiting member 69 is fixedly installed on the workbench and inserted into the limiting groove 43. The limiting member 69 is specifically a steel plate, one end of which is detachably fixed to the lower surface of the top plate 13 by a bolt, and the other end of which extends beyond the inner ring and into the limiting groove. When the driving motor drives the inner ring to rotate, the lifting pipe can only reciprocate in the vertical direction due to the limiting action of the limiting member 69, and cannot rotate relative to the outer ring.

[0036] To prevent the lifting pipe 41 from being separated downward from the inner ring 61, a limiting flange 42 is arranged on the top of the lifting pipe 41, which is formed by the outer peripheral surface of the lifting pipe protruding radially outward, and can be supported on the top of the inner ring, thereby preventing the lifting pipe from being separated downward from the inner ring 61.

[0037] The liquid crystal screen 18 is installed on the top of the lifting pipe. In this embodiment, the upper surface of the liquid crystal screen is flush with the upper end surface of the lifting pipe. It can be understood that in other embodiments, the upper surface of the liquid crystal screen can also be above the upper end surface of the lifting pipe, but the height of the upper surface of the liquid crystal screen above the upper end surface of the lifting pipe should not be too large, generally not more than 1 mm. To facilitate the installation of the liquid crystal screen 18, a supporting ring 44 is arranged on the inner wall of the lifting pipe, and the liquid crystal screen is supported on the supporting ring.

[0038] A sleeve 36 is welded to the upper end surface of the outer ring 62, which is coaxially arranged with the inner ring, and the inner wall of the sleeve has a second internal thread. The trough 30 has a circular annular trough wall 31, a light-transmitting glass 33 is installed on the bottom of the trough wall, and a release film is laid on the upper surface of the light-transmitting glass. A second external thread is arranged on the outer peripheral surface of the trough wall, and the trough is screwed on the second internal thread of the sleeve, so that the trough wall is threadedly engaged on the inner side of the sleeve. A guide hole 32 extending in the vertical direction is arranged in the body of the trough wall, and a guide rod 37 is fixedly installed on the inner ring and slidably penetrates into the guide hole. In this embodiment, when the trough is installed, the trough is first screwed into the sleeve, and after the distance between the trough and the inner ring of the slewing bearing 60 reaches a set distance, the guide rod is then inserted into the guide hole and screwed into the bolt hole on the top of the inner ring. The set distance is determined according to the height by which the trough needs to be lowered.

[0039] It is understood that in another embodiment, a flange can also be installed at the lower end of the sleeve, and then the flange is fixed on the outer ring by bolts.

[0040] The trough has a first working position and a second working position, and the lifting pipe has a third working position and a fourth working position. When the trough is in the first working position, the lifting pipe is in the third working position; when the trough is in the second working position, the lifting pipe is in the fourth working position. When the driving motor drives the inner ring to rotate, the trough can reciprocate between the first working position and the second working position, and at the same time, the lifting pipe can reciprocate between the third working position and the fourth working position.

[0041] Please also refer to Figure 1 and Figure 3 , Figure 1 , the trough is in the first working position, and the lifting pipe is in the third working position, Figure 3 , the trough is in the second working position, and the lifting pipe is in the fourth working position. When the trough is in the first working position and the lifting pipe is in the third working position, the printing platform can be immersed in the photosensitive resin in the trough for printing work. When the trough is in the second working position and the lifting pipe is in the fourth working position, the product model on the printing platform is separated from the release film of the release film. When the driving motor 71 drives the inner ring 61 to rotate, the trough can be driven to rotate downward from the first working position to the second working position, and the lifting pipe can be driven to move downward from the third working position to the fourth working position at the same time, or the trough can be driven to rotate upward from the second working position to the first working position, and the lifting pipe can be driven to move upward from the fourth working position to the third working position at the same time.

[0042] In order to avoid friction between the light-transmitting glass and the liquid crystal screen during rotation of the trough, and to avoid wear of the two, in the embodiment, when the trough is in the first working position and the lifting pipe is in the third working position, there is a gap of 0.5mm between the light-transmitting glass and the liquid crystal screen. The distance between the light-transmitting glass and the liquid crystal screen should not be too large, and is preferably 0.2-1mm, and can be 0.2mm, 0.4mm, 0.8mm or 1mm, or other distances between 0.2-1mm. An ultraviolet light system 14 is installed in the inner cavity of the workbench, and the ultraviolet light emitted by the ultraviolet light system can irradiate the liquid crystal screen. In the embodiment, the ultraviolet light system uses existing mature technology, and will not be described in detail.

[0043] In order to reduce the interference of the guide rod to the work, when the trough is in the first working position and the lifting pipe is in the third working position, the top of the guide rod is lower than the top of the trough wall. The guide rod in this embodiment is a cylindrical rod. In order to facilitate the screwing of the guide rod, a hexagonal screw hole is arranged at the top of the guide rod. A hexagonal wrench can be inserted into the screw hole to screw the guide rod into the threaded hole at the top of the inner ring of the slewing bearing 60, or unscrew the guide rod from the threaded hole.

[0044] The printing platform has a second central axis 171 extending in the vertical direction. Since the sleeve is coaxially arranged with the inner ring, the trough is screwed on the sleeve, so that the trough is coaxially arranged with the inner ring, that is, the trough is coaxially arranged with the slewing bearing. The first central axis 311 of the slewing bearing 60 is also the central axis of the trough. In the horizontal direction, the first central axis and the second central axis have a distance H. In this embodiment, the distance H between the first central axis and the second central axis in the horizontal direction is 5 mm. In other embodiments, the distance H between the first central axis and the second central axis in the horizontal direction is preferably 5-15 mm. The specific distance H can be selected according to the size of the trough. The larger the trough, the greater the distance H between the first central axis and the second central axis in the horizontal direction, but there is no special requirement in the specific selection. Figure 2 For clarity, the second central axis 171 and the first central axis 311 are represented by a small circle, and the Figure 2 In the figure, the position of the printing platform in the trough is represented by a dashed line.

[0045] The first central axis and the second central axis are spaced apart in order to prolong the service life of the release film. When the first central axis and the second central axis overlap, the point on the first central axis is actually in a static state when the trough rotates. Under the drive of the product model, the release film will produce vortex-like twisting around the first central axis, accelerating the failure of the release film. After the first central axis and the second central axis are spaced apart, the product model can produce overall movement with the release film when the trough rotates, avoiding the above-mentioned vortex-like twisting, which is more conducive to the separation of the product model and the release film and ensures the service life of the release film.

[0046] In this embodiment, the second internal thread of the sleeve has the same pitch as the first internal thread of the inner ring, so that the lifting speed of the trough is the same as the lifting speed of the lifting tube when the inner ring rotates. It can be understood that in another embodiment, the second internal thread of the sleeve can also have a smaller pitch than the first internal thread of the inner ring, in which case the lifting speed of the trough is smaller than the lifting speed of the lifting tube. Since in operation, the initial position of the trough is in the first working position and the lifting tube is in the third working position, and then the trough and the lifting tube move in the order of descending-ascending-descending-ascending, the liquid crystal screens on the trough and the lifting tube will not collide together due to the lifting speed of the lifting tube being greater than the lifting speed of the trough. However, in order to avoid the lifting tube from moving upward beyond the third working position due to a misoperation, causing the trough to collide with the liquid crystal screens, it is recommended to use the solution in which the second internal thread of the sleeve has the same pitch as the first internal thread of the inner ring. In order to synchronize the downward or upward movement of the trough and the lifting tube, the second internal thread of the sleeve and the first internal thread of the inner ring have opposite helical directions.

[0047] The light-curing 3D printing method in this application is described below, which is carried out by using the above-mentioned pull-up type light-curing 3D printer. The light-curing 3D printing method comprises the following steps:

[0048] (1) Adjust the positions of the trough and the lifting tube so that the trough is in the first working position and the lifting tube is in the third working position; immerse the printing platform in the photosensitive resin in the trough so that the printing platform has a gap of one solidification layer thickness with the release film, and complete the printing of the first solidification layer;

[0049] (2) Lift the printing platform upward, make the driving motor rotate forward, the trough rotates downward to the second working position, and the lifting tube moves downward to the fourth working position synchronously, complete the peeling of the first solidification layer from the release film;

[0050] (3) Reverse the driving motor, the trough rotates upward to the first working position, and the lifting tube moves upward to the third working position synchronously, lower the printing platform so that the first solidification layer has a gap of one solidification layer thickness with the release film, and complete the printing of the second solidification layer;

[0051] (4) Repeat steps (2) and (3) to continue the printing of the solidification layer until the printing of the product model is completed.

[0052] In order to maximize the printing efficiency, the driving motor is started forward synchronously when the printing platform is lifted upward, and the printing platform is lowered synchronously when the driving motor is reversed. In this embodiment, the number of turns of the trough during the peeling of the solidification layer from the release film is 0.4 turns.

Claims

1. The synchronous drive mechanism of the material trough and the LCD screen of the top-pull light-curing 3D printer is characterized by: It includes a slewing bearing and a drive motor installed on the top plate of the workbench; the drive motor is a servo motor; The slewing bearing comprises an outer ring and an inner ring connected together by balls. The central axis of the slewing bearing extends vertically. The outer ring is fixed to a workbench. The output shaft of the drive motor is connected to the inner ring, and the drive motor is capable of driving the inner ring to rotate. The lifting tube is threadedly engaged with the inner side of the inner ring. The lifting tube is limited to reciprocating movement in the vertical direction and cannot rotate relative to the outer ring. The LCD screen is mounted on the top of the lifting tube. A limiting groove extending in the vertical direction is provided on the outer peripheral surface of the lifting tube, and a limiting member is fixedly installed on the workbench and inserted into the limiting groove; A sleeve is fixed on the outer ring and is coaxially arranged with the inner ring. The material trough has an annular groove wall, and a release film is installed at the bottom of the groove wall. The groove wall of the material trough is threadedly engaged with the inner side of the sleeve. A guide hole extending in the vertical direction is provided in the body of the groove wall. A guide rod is fixedly installed on the inner ring and slidably penetrates the guide hole. The trough has a first working position and a second working position, and the lifting tube has a third working position and a fourth working position. When the trough is in the first working position, the lifting tube is in the third working position; when the trough is in the second working position, the lifting tube is in the fourth working position. When the driving motor drives the inner ring to rotate, the trough can be reciprocated between the first working position and the second working position, and the lifting tube can be reciprocated between the third working position and the fourth working position at the same time. When the trough is located at the first working position and the lifting tube is located at the third working position, printing can be performed; When the material trough is located at the second working position and the lifting tube is located at the fourth working position, the release film and the product model on the printing platform are in a separated state.

2. The synchronous driving mechanism of the trough and the liquid crystal screen according to claim 1, characterized in that: One end of the limiting member is detachably fixed to the lower surface of the top plate, and the other end of the limiting member extends into the limiting groove.

3. The synchronous driving mechanism of the material trough and the liquid crystal screen according to claim 1, characterized in that: The upper surface of the liquid crystal screen is not lower than the upper end surface of the lifting tube.

4. The synchronous driving mechanism of the trough and the liquid crystal screen according to claim 1, characterized in that: A transparent glass is provided at the bottom of the material trough, and a release film is laid on the transparent glass; when the material trough is in the first working position and the lifting tube is in the third working position, the distance between the transparent glass and the LCD screen is 0.2-1mm.

5. The synchronous driving mechanism of the trough and the liquid crystal screen according to claim 1, characterized in that: The printing platform has a central axis extending in a vertical direction. In a horizontal direction, there is a distance between the central axis of the printing platform and the central axis of the material trough.

6. The synchronous driving mechanism of the material trough and the liquid crystal screen according to claim 1, characterized in that: The pitch of the internal thread of the casing is the same as the pitch of the internal thread of the inner ring; or the pitch of the internal thread of the casing is smaller than the pitch of the internal thread of the inner ring.

7. The synchronous driving mechanism of the material trough and the liquid crystal screen according to claim 1, characterized in that: A gear is mounted on the output shaft of the driving motor, an outer gear ring is mounted on the lower part of the inner ring, and the gear is meshed with the outer gear ring; or A first pulley is installed on the output shaft of the driving motor, and a second pulley is provided at the lower part of the inner ring. The first pulley is wrapped around the first pulley and the second pulley via a belt.

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