Release film peeling mechanism for light-cured 3D printer

Abstract

The application discloses a release film stripping mechanism for a light-curing 3D printer, a hollow shaft torque motor of which comprises a mover, a stator and a hollow shaft, the stator is fixed on a workbench; a lifting pipe is threadedly engaged on the hollow shaft, and the lifting pipe can only reciprocate in a vertical direction; a sleeve is fixed on the stator, a material groove is threadedly engaged on the sleeve, and a guide rod on the hollow shaft is slidingly arranged in a guide hole in a groove wall; when the mover rotates, the material groove 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 groove is located at the first working position and the lifting pipe is located at the third working position, the light-curing 3D printer prints; when the material groove is located at the second working position and the lifting pipe is located at the fourth working position, the release film is separated from a product model. The application reduces the moving distance and speed of the printing platform by lowering the material groove, reduces the abrasion of the ball screw and the screw nut, and prolongs the service life of the equipment.

Description

[0001] This application is a divisional application. The application date of the original application is December 2, 2024, the application number is 2024117456763, and the name of the invention is: Light-curing 3D printer with trough sinking peeling and light-curing 3D printing method. Technical Field

[0002] The invention relates to a release film peeling mechanism for a light-curing 3D printer. Background Art

[0003] When using top-up light-curing 3D printing technology, the photosensitive material between the print platform and the release film solidifies under the illumination of a light source, forming a solidified layer that adheres to the print platform. The print platform is then raised to separate the solidified layer from the release film, and then lowered to form the next solidified layer. This process repeats until the desired product model is completed. Due to the adhesion between the solidified layer and the release film, it increases the difficulty of peeling the solidified layer and the release film, resulting in reduced printing efficiency. To improve printing efficiency, the material trough is usually swung or rotated to accelerate the peeling of the solidified layer and the release film.

[0004] Although the swinging method can speed up the peeling of the cured layer and the release film, the photosensitive resin is easy to overflow the material tank when it is tilted. To avoid the overflow of the photosensitive resin, it is necessary to increase the depth of the material tank or reduce the liquid volume of the material tank. At the same time, due to the swinging, air is easily mixed in the photosensitive resin, affecting the printing quality of the product model.

[0005] Although the rotation method can also speed up the separation of the solidified layer and the release film, the separation process of the solidified layer and the release film can only be completed by lifting the printing platform. When printing each product model, the printing platform needs to reciprocate at least dozens of times. Taking the commonly used 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 can easily cause wear on the ball screw and the screw nut, resulting in a decrease in printing accuracy and a shortened service life of the printing equipment.

[0006] Therefore, how to speed up the peeling speed of the curing layer and the release film, improve printing efficiency, reduce the wear of the ball screw, and extend the service life of the printing equipment while ensuring the quality of the product model remains a problem that needs to be solved in the development of top-up light-curing 3D technology. Summary of the Invention

[0007] To at least solve some of the above problems, the present application first proposes a release film peeling mechanism for a light-curing 3D printer, which includes a hollow shaft torque motor mounted on a top plate of a workbench; the hollow shaft torque motor is a servo motor;

[0008] The hollow shaft torque motor includes a coaxially arranged mover, a stator, and a hollow shaft, wherein the stator is rotatably sleeved on the outer periphery of the mover, and the hollow shaft is fixedly lined on the inner wall of the mover. The central axis of the hollow shaft torque motor extends in a vertical direction, and the stator is fixed to a workbench. A lifting tube is threadedly engaged with the inner side of the hollow shaft. The lifting tube is limited to reciprocating movement in the vertical direction and cannot rotate relative to the stator. The LCD screen is mounted on the top of the lifting tube.

[0009] A limiting groove extending in a vertical direction is provided on the outer peripheral surface of the lifting tube, and a limiting member is fixedly mounted on the stator and inserted into the limiting groove;

[0010] A sleeve is fixed on the stator and is coaxially arranged with the hollow shaft. 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 hollow shaft and slidably penetrates the guide hole.

[0011] 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 mover drives the hollow shaft 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.

[0012] When the material trough is located at the first working position and the lifting tube is located at the third working position, the light-curing 3D printer can perform printing; 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.

[0013] In the present application, the trough and the LCD screen are both mounted on a hollow shaft torque motor, and when the mover rotates, the trough and the lifting tube move up and down synchronously, that is, the trough and the LCD screen can be moved up and down synchronously. When the 3D printer equipped with the present application is working, it is necessary to first arrange the trough in the first working position and the lifting tube in the third working position, then complete the printing of a solidified layer, and then rotate the mover to lower the trough to the second working position and the lifting tube to the fourth working position, so that the solidified layer and the release film are separated, and then the trough is raised to the first working position and the lifting tube is raised to the third working position to print the next solidified layer. Since the trough rotates while moving up and down, the peeling speed of the solidified layer and the release film can be increased. Since the trough moves down at the same time when the solidified layer and the release film are peeled off, the lifting height and moving speed of the printing platform can be reduced, thereby reducing the rotation speed of the ball screw. Since the printing platform is engaged with the ball screw through the screw nut, the wear of the ball screw and the screw nut can be reduced. Therefore, the present application can improve the peeling speed of the solidified layer and the release film while also increasing the service life of the equipment.

[0014] In this application, since part of the moving distance of the printing platform is shared by the movement of the material trough, the lowering height of the material trough and the LCD screen can be flexibly adjusted according to needs, so as to reasonably distribute the moving distance of the printing platform and the moving distance of the material trough and the LCD screen in the vertical direction, which can minimize the wear of the ball screw and the screw nut to improve the service life of the equipment.

[0015] Furthermore, to prevent the restrictor from interfering with printing operations, one end of the restrictor is detachably secured to the underside of the stator, while the other end extends into the restricting slot. Mounting the restrictor on the underside of the stator allows it to be located within the inner cavity of the worktable, effectively preventing the restrictor from interfering with printing operations.

[0016] Specifically, in order to make the material trough as close to the liquid crystal screen as possible, the upper surface of the liquid crystal screen should not be lower than the upper end surface of the lifting tube.

[0017] Furthermore, a light-transmitting glass is provided at the bottom of the material trough, and a release film is laid on the light-transmitting 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 light-transmitting glass and the LCD screen is 0.2-1mm. This design can avoid the release film being directly supported on the LCD screen. When the release film is directly supported on the LCD screen, when the material trough rotates, the release film will rub against the LCD screen. After frequent friction, the light transmittance of the LCD screen will be reduced, thereby reducing the light curing efficiency. Using light-transmitting glass to support the release film and spacing the light-transmitting glass and the LCD screen can effectively avoid the mutual friction between the light-transmitting glass and the LCD screen when the material trough rotates, which will reduce the light transmittance of both the light-transmitting glass and the LCD screen, thereby reducing the light curing efficiency.

[0018] Further, the printing platform has a central axis extending in the vertical direction, and the central axis of the vat is spaced apart from the central axis of the printing platform in the horizontal direction. Preferably, the distance between the central axis of the vat and the central axis of the printing platform is 5-15 mm. This design can cause the bonding area of the cured layer and the release film to move relatively when the vat rotates, so that the cured layer and the release film can be peeled off smoothly. When the central axis of the vat coincides with the central axis of the printing platform, the area of the release film on the central axis will not move relatively with the cured layer when the vat rotates, and will also swirl around the central axis of the release film, accelerating the failure of the release film.

[0019] Further, the pitch of the internal thread of the sleeve is the same as or smaller than the pitch of the internal thread of the hollow shaft. When the pitch of the internal thread of the sleeve is the same as the pitch of the internal thread of the hollow shaft, the lifting speed of the vat is the same as the lifting speed of the lifting tube when the hollow shaft rotates, so that the LCD screen can be effectively prevented from colliding with the vat. When the pitch of the internal thread of the sleeve is smaller than the pitch of the internal thread of the hollow shaft, the initial position of the vat is the first working position and the initial position of the lifting tube is the third working position when the device is in operation, and then the vat and the lifting tube move in the sequence of descending-ascending-descending-ascending, so that the LCD screen on the vat 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 vat. However, in order to avoid the collision between the vat and the LCD screen due to misoperation, it is suggested that the pitch of the internal thread of the sleeve is the same as the pitch of the internal thread of the hollow shaft. In order to make the vat and the lifting tube move downward or upward synchronously, the screw direction of the internal thread of the sleeve is opposite to the screw direction of the internal thread of the hollow shaft.

[0020] When the light-curing 3D printer of any one of the above is in operation, the light-curing 3D printing method thereof comprises the following steps:

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

[0022] (2) Lift the printing platform upward, make the rotor of the hollow shaft torque motor rotate forward, and the vat 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 cured layer from the release film;

[0023] (3) The rotor of the hollow shaft torque motor is reversed, the trough rotates upward to the first working position, and the lifting tube moves upward to the third working position synchronously, and the printing platform is lowered so that there is a gap of the thickness of the first solidified layer and the release film, and the printing of the second solidified layer is completed;

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

[0025] In this application, during the printing process of the product model, after each solidified layer is printed, the actuator can be rotated, thereby lowering the trough from the first working position to the second working position, and the lifting tube from the third working position to the fourth working position. The trough rotates simultaneously during the descent 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 while the printing platform descends. 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, thereby increasing the service life of the equipment.

[0026] Specifically, the number of revolutions of the trough is ≥ 0.2 revolutions. The number of revolutions of the trough does not need to exceed 1 revolution, and the number of revolutions of the trough can be controlled within 0.2-1 revolutions, more preferably within 0.2-0.6 revolutions. When the trough rotates to a certain number of revolutions, the product model and the release film are separated, and too many revolutions are not beneficial to the separation of the product model and the release film. When the trough rotates, the height of the trough's descent is controlled between 2-5mm, and the height of separation between the product model and the release film is generally controlled between 5-10mm. In this application, the height of the trough's descent is controlled between 2-5mm, which is 20-50% of the height of separation between the product model and the release film. This 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 increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 yes Figure 1 Center AA view.

[0029] Figure 3 yes Figure 1 Magnified view of part B.

[0030] Figure 4 yes Figure 1 Another state diagram of the accompanying drawings is shown. DETAILED DESCRIPTION

[0031] The following first describes the trough sinking type stripping light-curing 3D printer in the present application, please refer to Figure 1-Figure 3 The light-curing 3D printer includes a workbench 10, which includes a vertical wall 11 in the shape of a rectangular cylinder, 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.

[0032] A transmission mechanism is installed on the workbench, which includes 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 a lifting arm 16 is engaged with 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 a printing platform 17 is installed on the free end. Under the drive 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, the lifting motor 21 is specifically a servo motor, and the specific transmission mechanism can be known from the prior art.

[0033] A hollow shaft torque motor 70 is installed on the top plate 13, which includes a rotor 75 and a stator 71 rotatably sleeved outside the rotor 75, and a hollow shaft 76 is fixedly arranged in the rotor. An upper end cover 72 and a lower end cover 73 are respectively installed at the upper and lower ends of the stator 71, the upper end cover 72 is bolted to the upper flange 711 at the upper end of the stator 71, the lower end cover 73 is bolted to the lower flange 712 at the lower end of the stator 71, and the upper flange 711 and the lower flange 712 are integrally formed on the stator 71. The stator 71, the rotor 75, and the hollow shaft 76 are coaxially arranged.

[0034] In this embodiment, an upper connecting flange 761 is arranged at the upper part of the outer circumferential surface of the hollow shaft 76, the upper end cover has an inwardly protruding upper abutting flange 721, the lower surface of the upper abutting flange 721 is a downwardly inclined step surface, the upper abutting flange 721 is abutted against the upper side of the outer ring of the upper angular contact bearing 771 through the lower surface, and the upper connecting flange 761 is abutted 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.

[0035] A lower step 762 is provided at the lower portion of the outer circumference of hollow shaft 76. This step has a downward-facing stepped surface and is formed by a radially inward depression of the outer circumference of hollow shaft 76. The lower end cap has an inwardly protruding lower abutting flange 731. The upper surface of lower abutting flange 731 is an upward-facing stepped surface. Lower abutting flange 731 abuts the lower side of the outer ring of lower angular contact bearing 772 via its upper surface, and lower step 762 presses against the upper side of the inner ring of the lower angular contact bearing, rotatably connecting the lower end cap to hollow shaft 76 via the lower angular contact bearing. Windings 74 are provided on the inner side of the stator. The structure of the hollow shaft torque motor can be completed using existing mature technologies and will not be described in detail.

[0036] In this embodiment, to reduce the impact of the hollow-shaft torque motor 70 on printing, a stepped hole 19 is provided in the top plate. This stepped hole 19 is larger at the top and smaller at the bottom, resulting in an upward-facing stepped surface 191. A stator flange 713 is provided on the outer circumference of the stator 71. This stator flange is supported on the stepped surface 191. Fixing bolts 714 connect the stator flange to the top plate 13, thereby mounting the hollow-shaft torque motor 70 on the top plate.

[0037] A first internal thread is provided on the inner circumferential surface of the hollow shaft 76, and a first external thread is provided on the outer wall of the lifting tube 41. The lifting tube 41 is engaged with the first internal thread of the hollow shaft 76 via the first external thread, so that the lifting tube 41 is threadedly engaged on the inner side of the hollow shaft 76. The lifting tube 41 is limited to reciprocating movement only in the vertical direction and cannot rotate relative to the stator.

[0038] In this embodiment, a vertically extending restriction groove 43 is provided on the outer circumference of the lift tube. A restriction member 69 is bolted to the underside of the lower end cap and inserted into the restriction groove 43. Restriction member 69 is specifically a steel plate. One end of restriction member 69 is removably bolted to the lower surface of the lower end cap, while the other end of restriction member 69 extends past the mover and into the restriction groove. When the mover rotates the hollow shaft, the restrictive action of restriction member 69 forces the lift tube to reciprocate vertically and prevents rotation relative to the hollow shaft.

[0039] In order to prevent the lifting tube 41 from falling off the hollow shaft 76 downward, a limiting flange 42 is provided at the top of the lifting tube 41. The limiting flange 42 is formed by the outer peripheral surface of the lifting tube protruding radially outward, and the limiting flange 42 can be supported on the top of the hollow shaft, thereby preventing the lifting tube from falling off the hollow shaft 76 downward.

[0040] LCD screen 18 is mounted on top of the lift tube. In this embodiment, the upper surface of the LCD screen is flush with the upper end surface of the lift tube. It is understood that in other embodiments, the upper surface of the LCD screen can extend beyond the upper end surface of the lift tube. However, the height by which the upper surface of the LCD screen extends beyond the upper end surface of the lift tube should not be excessive, typically not exceeding 1 mm. To facilitate the installation of LCD screen 18, a support ring 44 is provided on the inner wall of the lift tube, upon which the LCD screen is supported.

[0041] The sleeve 36 is fixedly mounted on the upper end cover 72. A sleeve flange 34 extending radially outward is provided at the lower end of the sleeve. A sleeve bolt 35 passes through the sleeve flange 34 and is screwed onto the upper end cover 72, so that the sleeve 36 is indirectly fixed to the stator via the upper end cover.

[0042] The sleeve is coaxially mounted with the hollow shaft and has a second internal thread on its inner wall. The trough 30 has an annular trough wall 31, with a light-transmitting glass 33 mounted at its bottom and a release film applied to its upper surface. A second external thread is provided on the outer circumference of the trough wall. The trough is screwed onto the second internal thread via the second external thread, causing the trough wall to threadably engage the inner side of the sleeve.

[0043] A vertically extending guide hole 32 is provided within the trough wall. A guide rod 37 is fixedly mounted on the hollow shaft and slidably extends through the guide hole. In this embodiment, when installing the trough, the trough must first be screwed into the sleeve. After the distance between the trough and the mover reaches a set distance, the guide rod is inserted into the guide hole and screwed into the bolt hole at the top of the hollow shaft. This set distance is determined by the desired height of the trough.

[0044] 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 mover drives the hollow shaft to rotate, the trough can reciprocate between the first and second working positions, and simultaneously reciprocate between the third and fourth working positions.

[0045] Please also see Figure 1 and Figure 4 , Figure 1 In the process, the trough is in the first working position, and the lifting tube is in the third working position. Figure 4In the embodiment of the present invention, the material trough is in the second working position and the lifting tube is in the fourth working position. When the material trough is in the first working position and the lifting tube is in the third working position, the printing platform can be immersed in the photosensitive resin in the material trough to perform printing. When the material trough is in the third working position and the lifting tube is in the fourth working position, the product model on the printing platform and the release film are separated. When the mover drives the hollow shaft to rotate, the material trough can be rotated downward from the first working position to the second working position, and the lifting tube can be moved downward from the third working position to the fourth working position at the same time, or the material trough can be rotated upward from the second working position to the first working position, and the lifting tube can be moved upward from the fourth working position to the third working position at the same time.

[0046] To prevent friction and wear between the light-transmitting glass and the LCD screen when the trough is rotating, in this embodiment, when the trough is in the first working position and the lifting tube is in the third working position, a gap of 0.5 mm is provided between the light-transmitting glass and the LCD screen. The distance between the light-transmitting glass and the LCD screen should not be too large, preferably 0.2-1 mm, and can also be 0.2 mm, 0.4 mm, 0.8 mm or 1 mm, and of course other distances between 0.2-1 mm are also possible. An ultraviolet light system 14 is installed in the inner cavity of the workbench. The ultraviolet light emitted by the ultraviolet light system can illuminate the LCD screen. In this embodiment, the ultraviolet light system adopts existing mature technology and will not be described in detail.

[0047] To minimize interference with the guide rod during operation, in this embodiment, when the trough is in the first working position and the lift tube 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. To facilitate tightening the guide rod, a regular hexagonal screw hole is provided at the top of the guide rod. An Allen wrench can be inserted into the screw hole to screw the guide rod into the threaded hole at the top of the hollow shaft, or to remove the guide rod from the threaded hole.

[0048] The printing platform has a second central axis 171 extending in the vertical direction. Since the sleeve is coaxially arranged with the hollow shaft, the material trough is screwed onto the sleeve, so that the material trough and the hollow shaft are coaxially arranged, that is, the material trough and the hollow shaft torque motor are coaxially arranged. The first central axis 311 of the hollow shaft torque motor 70 is also the central axis of the material trough. In the horizontal direction, there is a distance H between the first central axis and the second central axis. In this embodiment, the horizontal distance H between the first central axis and the second central axis is 5mm. The horizontal distance H between the first central axis and the second central axis is preferably 5-15mm. In other embodiments, the distance H can be selected according to the size of the material trough. The larger the material trough, the larger the horizontal distance H between the first central axis and the second central axis. However, there are no special requirements when making a specific selection. Figure 2 In the figure, for clarity, the second central axis 171 and the first central axis 311 are both represented by a small circle, and Figure 2 In the figure, the position of the printing platform in the trough is indicated by a dotted line.

[0049] The purpose of spacing the first and second central axes is to extend the lifespan of the release film. When the first and second central axes overlap, the point on the first central axis is effectively stationary during the chute's rotation. Driven by the product model, the release film experiences a swirling twist about the first central axis, accelerating its failure. However, spacing the first and second central axes allows the product model and the release film to move as a whole during chute rotation, avoiding this swirling twist. This facilitates separation and ensures the release film's lifespan.

[0050] In this embodiment, the pitch of the second internal thread of the sleeve is the same as the pitch of the first internal thread of the hollow shaft, ensuring that the trough and the lifting tube can be raised and lowered at the same speed when the hollow shaft rotates. It is understood that in another embodiment, the pitch of the second internal thread of the sleeve can be smaller than the pitch of the first internal thread of the hollow shaft. In this case, the trough and the lifting tube move in a descending-ascending-descending-ascending sequence during operation. This prevents the trough and the LCD screen on the lifting tube from colliding due to the lifting tube's speed exceeding the trough's. However, to prevent the lifting tube from exceeding the third working position due to misoperation and causing the trough and the LCD screen to collide, it is recommended that the pitch of the second internal thread of the sleeve and the pitch of the first internal thread of the hollow shaft be the same. To ensure synchronous downward and upward movement of the trough and the lifting tube, the second internal thread of the sleeve and the first internal thread of the hollow shaft have opposite spiral directions.

[0051] The following describes the light-curing 3D printing method in this application. The light-curing 3D printing method is performed using the above-mentioned trough-sinking peeling light-curing 3D printer. The light-curing 3D printing method includes the following steps:

[0052] (1) Adjust the positions of the material trough and the lifting tube so that the material 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 material trough so that there is a gap of the thickness of the solidified layer between the printing platform and the release film, and complete the printing of the first solidified layer;

[0053] (2) Lift the printing platform upward, so that the mover of the hollow shaft torque motor rotates forward, the material trough rotates downward to the second working position, and the lifting tube moves downward to the fourth working position synchronously, completing the peeling of the first solidified layer and the release film;

[0054] (3) The rotor of the hollow shaft torque motor is reversed, the trough rotates upward to the first working position, and the lifting tube moves upward to the third working position synchronously, and the printing platform is lowered so that there is a gap of the thickness of the first solidified layer and the release film, and the printing of the second solidified layer is completed;

[0055] (4) Repeat steps (2) and (3) to continue printing the solidified layer until the product model is printed.

[0056] To maximize printing efficiency, the hollow shaft torque motor is activated as the print platform is raised, causing its actuator to rotate forward. When the actuator rotates in the reverse direction, the print platform is lowered. In this embodiment, the trough rotates 0.4 times during the process of peeling the solidified layer from the release film.

Claims

1. A release film peeling mechanism for a light-curing 3D printer, characterized in that: The hollow shaft torque motor is mounted on the top plate of the workbench; the hollow shaft torque motor is a servo motor; The hollow shaft torque motor includes a coaxially arranged mover, a stator, and a hollow shaft, wherein the stator is rotatably sleeved on the outer periphery of the mover, and the hollow shaft is fixedly lined on the inner wall of the mover. The central axis of the hollow shaft torque motor extends in a vertical direction, and the stator is fixed to a workbench. A lifting tube is threadedly engaged with the inner side of the hollow shaft. The lifting tube is limited to reciprocating movement in the vertical direction and cannot rotate relative to the stator. The LCD screen is mounted on the top of the lifting tube. A limiting groove extending in a vertical direction is provided on the outer peripheral surface of the lifting tube, and a limiting member is fixedly mounted on the stator and inserted into the limiting groove; A sleeve is fixed on the stator and is coaxially arranged with the hollow shaft. 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 hollow shaft 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 mover drives the hollow shaft 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, the light-curing 3D printer can perform printing work; 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 release film peeling mechanism according to claim 1, characterized in that: One end of the limiting member is detachably fixed to the lower side of the stator, and the other end of the limiting member extends into the limiting groove.

3. The release film peeling mechanism according to claim 1, wherein: The upper surface of the liquid crystal screen is not lower than the upper end surface of the lifting tube.

4. The release film peeling mechanism according to claim 1, wherein: 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 release film peeling mechanism according to claim 1, wherein: 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 material trough and the central axis of the printing platform.

6. The release film peeling mechanism according to claim 1, characterized in that: The pitch of the internal thread of the sleeve is the same as the pitch of the internal thread of the hollow shaft; or the pitch of the internal thread of the sleeve is smaller than the pitch of the internal thread of the hollow shaft.

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