Leveling device and photocuring 3D printer

Abstract

The present application relates to the technical field of 3D printing, and discloses a leveling device and a photocuring 3D printer. The leveling device is used for leveling a 3D printer and comprises: support assemblies, the support assemblies each comprising a mounting portion and cantilever portions symmetrically arranged on two sides of the mounting portion and separately connected to the mounting portion, an accommodating recess being formed between the mounting portion and the cantilever portions, and the cantilever portions being connected to a middle plate assembly; detection assemblies, arranged on the support assemblies and connected to a controller, the detection assemblies being used for detecting the deformation of the support assemblies; and leveling assemblies, the leveling assemblies being respectively connected to the support assemblies and the controller, and the leveling assemblies being used for adjusting the distance between a printing platform and a printing screen under the control of the controller.

Description

Leveling device and light-curing 3D printer

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420642666.6 filed on March 29, 2024, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to the field of 3D printing technology, and in particular to a leveling device and a light-curing 3D printer. Background Art

[0004] Light-curing 3D printers generally use a light source in a specific wavelength range to irradiate liquid resin to trigger a photopolymerization reaction, so that the light-curing resin in the area irradiated by the light source is solidified from the liquid and the object to be formed is obtained after curing layer by layer.

[0005] There are three types of related photocuring printing technologies: LCD (liquid crystal photocuring), SLA (laser point light source curing), and DLP (projector surface light source curing). In LCD technology, an LCD screen is installed on the printer's center plate. After resin is poured into the material tank, it is fixed to the LCD screen with hand screws on both sides. At this time, the material tank release film adheres to the upper surface of the LCD screen. The printing platform is driven by the lifting drive assembly to descend into the resin, maintaining a relatively uniform gap with the release film at the bottom of the material tank. Ultraviolet light from below the LCD screen passes through the pattern displayed on the screen and is projected onto the resin above the release film, causing the resin between the printing platform and the release film to cure.

[0006] During this process, the print quality of the first layer plays a critical role in the overall quality of the model. Because the release film is supported by the LCD screen, its tilt and flatness are determined by the LCD screen. Therefore, to ensure the accuracy of the first layer, the LCD screen and the build surface must be parallel and have a uniform and precise gap.

[0007] Summary of the Invention

[0008] The present application provides a leveling device and a light-curing 3D printer, which can automatically adjust the flatness of the printing screen to improve the printing success rate and printing quality.

[0009] To solve the above technical problems, a technical solution adopted in this application is to provide a leveling device for leveling a 3D printer, wherein the 3D printer includes a middle plate assembly provided with a printing screen, a printing assembly provided with a printing platform, and a controller, and the leveling device includes:

[0010] A bracket assembly, the bracket assembly comprising a mounting portion and cantilever portions symmetrically arranged on both sides of the mounting portion and respectively connected to the mounting portion, a receiving groove being formed between the mounting portion and the cantilever portions, and the cantilever portions being connected to the mid-plate assembly;

[0011] a detection component, the detection component being provided on the support component and connected to the controller, the detection component being used to detect a deformation amount of the support component; and

[0012] A leveling component is connected to the support component and the controller respectively, and is used to adjust the distance between the printing platform and the printing screen under the control of the controller.

[0013] According to one or more embodiments of the present application, the middle plate assembly includes a screen floating plate for fixing the printing screen and a middle plate connected to the screen floating plate, the middle plate is located on the surface of the screen floating plate away from the printing screen, and the cantilever portion is fixed to the side of the screen floating plate away from the printing screen.

[0014] According to one or more embodiments of the present application, the leveling assembly includes:

[0015] a driving unit, the driving unit being fixed to a side of the middle plate away from the screen floating plate and connected to the controller;

[0016] a transmission part, one end of which is connected to the driving part; and

[0017] A connecting portion is fixed to the mounting portion and is threadedly connected to the other end of the transmission portion to adjust the distance between the printing platform and the printing screen in the transmission direction of the transmission portion.

[0018] According to one or more embodiments of the present application, the detection component is a full-bridge strain gauge.

[0019] According to one or more embodiments of the present application, the cantilever portion includes:

[0020] a first bending section, the first bending section being connected to the mounting portion;

[0021] The second bending section is connected to the first bending section, and the second bending section is parallel to the mounting portion and is not arranged coplanarly.

[0022] To solve the above technical problems, another technical solution adopted in this application is to provide a light-curing 3D printer, comprising:

[0023] Controller;

[0024] Base plate assembly;

[0025] A middle plate assembly, the middle plate assembly being arranged on the bottom plate assembly and provided with a printing screen;

[0026] A material trough assembly, the material trough assembly is used to accommodate the light-curing material and is supported by the middle plate assembly;

[0027] A light source assembly; the light source assembly is disposed in the base plate assembly and is used to provide light for curing the light-curable material;

[0028] a lifting assembly, the lifting assembly being arranged on the middle plate assembly and connected to the controller;

[0029] a printing assembly, the printing assembly being arranged corresponding to the trough assembly and connected to the lifting assembly, the printing assembly including a printing platform; and

[0030] At least one leveling device is fixed to the middle plate assembly and connected to the controller, and adjusts the distance between the printing platform and the printing screen under the control of the controller.

[0031] According to one or more embodiments of the present application, the middle plate assembly includes: a screen floating plate for fixing the printing screen and a middle plate connected to the screen floating plate, the middle plate is located on the surface of the screen floating plate away from the printing screen, and the bracket assembly of the leveling device is fixed to the side of the screen floating plate away from the printing screen.

[0032] According to one or more embodiments of the present application, a mounting seat is provided on a side of the middle plate away from the screen floating plate, a receiving cavity for accommodating the bracket assembly is provided inside the mounting seat, a through hole penetrating the receiving cavity is provided on the bottom wall of the mounting seat, a driving part of the leveling assembly is fixed to the bottom wall, and a transmission part of the leveling assembly is passed through the through hole and connected to the connecting part of the leveling assembly.

[0033] According to one or more embodiments of the present application, the light source assembly includes a first heat sink block arranged in the base plate assembly, a first lamp board arranged on the first heat sink block, and a reflective cup covered on the first lamp board, one end of the reflective cup is connected to the first heat sink block, and the other end is connected to the screen floating plate.

[0034] According to one or more embodiments of the present application, the light source assembly includes a first bracket connected to the middle plate, a second bracket arranged on the first bracket, an optical axis arranged on the first bracket, a bearing passing through the optical axis and slidingly connected to the optical axis, a second heat dissipation block connected to the bearing, a second lamp board arranged on the second heat dissipation block, a light shield arranged on the second lamp board, and a drive motor arranged on the second bracket and connected to the optical axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic diagram of a first structure of a light-curing 3D printer according to one or more embodiments of the present application;

[0036] FIG2 is a schematic diagram of the explosion structure of FIG1 ;

[0037] FIG3 is an exploded schematic diagram of a portion of the structure in FIG2 ;

[0038] FIG4 is a schematic diagram of the structure in FIG3 after assembly;

[0039] Figure 5 is a cross-sectional view taken along line BB in Figure 4;

[0040] FIG6 is a schematic diagram of a partially enlarged structure of area C in FIG5 ;

[0041] FIG7 is a schematic diagram of a partially enlarged structure of area A in FIG3 ;

[0042] FIG8 is a schematic diagram of a first state of a light-curing 3D printer in one or more embodiments of the present application;

[0043] FIG9 is a schematic diagram of a second state of a light-curing 3D printer in one or more embodiments of the present application;

[0044] FIG10 is a schematic diagram of a second structure of a light-curing 3D printer according to one or more embodiments of the present application;

[0045] FIG11 is a schematic structural diagram of the light source assembly in FIG10 .

[0046] The meanings of the numbers in the accompanying drawings are as follows: 100 - light-curing 3D printer; 10 - bottom plate assembly; 20 - middle plate assembly; 30 - trough assembly; 40 - light source assembly; 50 - lifting assembly; 60 - printing assembly; 70 - leveling device; 11 - bottom plate; 12 - support column; 13 - foot pad; 21 - printing screen; 22 - screen floating plate; 23 - middle plate; 24 - screen pressing sheet; 25 - light shielding sheet; 220 - accommodation space; 230 - accommodation cavity; 231 - mounting seat; 31 - trough; 41 - first heat sink; 42 - first light board; 43 - reflector; 401 - first bracket; 402 - second bracket; 403 - optical axis; 404 -bearing; 405-second heat sink; 407-light shield; 408-second drive motor; 51-profile; 52-first drive motor; 53-linear guide; 54-slider; 55-ball screw and nut; 56-bearing seat; 57-connecting arm; 58-coupling; 61-printing platform; 62-handle; 63-screw; 71-bracket assembly; 72-detection assembly; 73-leveling assembly; 711-installation part; 712-cantilever part; 713-accommodation groove; 7121-first bending section; 7122-second bending section; 731-driving part; 732-transmission part; 733-connecting part. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The terms "first", "second" and "third" in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0049] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in one or more embodiments of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] Currently, manual leveling of the print platform is primarily performed by connecting the handle to the print platform through the waist-shaped holes in the adapter plate and tightening the screws on both sides to ensure that the bottom surface of the print platform is parallel to the LCD screen. However, this manual leveling method can cause the print platform and LCD screen to become non-parallel and unevenly spaced during the screw tightening process. This can easily lead to uneven thickness of the first layer of the model, preventing it from evenly and firmly adhering to the print platform, resulting in print failure.

[0051] FIG1 is a schematic diagram of the structure of a light-curing 3D printer according to an embodiment of the present application, and FIG2 is an exploded view of FIG1 . As shown in FIG1 and FIG2 , the light-curing 3D printer 100 includes a controller (not shown), a base plate assembly 10, a mid-plate assembly 20, a trough assembly 30, a light source assembly 40, a lifting assembly 50, a printing assembly 60, and at least one leveling device 70. The mid-plate assembly 20 is mounted on the base plate assembly and includes a print screen 21. The trough assembly 30 is used to hold light-curable material and is supported by the mid-plate assembly 20. The light source assembly 40 is mounted in the base plate assembly 10 and provides light for curing the light-curable material. The lifting assembly 50 is mounted on the mid-plate assembly 20 and connected to the controller. The printing assembly 60 is mounted corresponding to the trough assembly 30 and connected to the lifting assembly 50. The printing assembly 60 includes a printing platform 61. The leveling device 70 includes a support assembly 71, a detection assembly 72, and a leveling assembly 73. The bracket assembly 71 includes a mounting portion 711 and cantilever portions 712 symmetrically arranged on both sides of the mounting portion 711 and respectively connected to the mounting portion 711. A receiving groove 713 is formed between the mounting portion 711 and the cantilever portion 712, and the cantilever portion 712 is connected to the middle plate assembly 20; the detection assembly 72 is arranged on the bracket assembly 71 and connected to the controller, and the detection assembly 72 is used to detect the deformation of the bracket assembly 71; the leveling assembly 73 is connected to the bracket assembly 71 and the controller, and the leveling assembly 73 is used to adjust the distance between the printing platform 61 and the printing screen 21 under the control of the controller. The leveling device 70 detects the deformation of the bracket assembly 71 through the detection assembly 72, and the controller controls the leveling assembly 73 to automatically adjust the distance between the printing platform 61 and the printing screen 21 according to the deformation, thereby greatly reducing the probability of the first layer of the board falling off during subsequent printing, and improving the printing success rate and printing quality while reducing manual operation errors, thereby solving the problem of printing failure caused by the non-parallelism and uneven gap between the printing platform 61 and the printing screen 21.

[0052] Furthermore, the print screen 21 has a display function, such as an LED screen or other types of imaging screens.

[0053] Furthermore, referring to Figures 2 and 3 , the middle plate assembly 20 includes a floating screen plate 22 for securing the print screen 21, and a middle plate 23 connected to the floating screen plate 22. The middle plate 23 is positioned on the surface of the floating screen plate 22 facing away from the print screen 21. Referring to Figures 2 and 3 , the floating screen plate 22 defines a receiving space 220. The middle plate assembly 20 also includes a screen pressing plate 24 for securing the print screen 21, and a light shielding sheet 25 connecting the print screen 21 and the floating screen plate 22. When the middle plate assembly 20 is assembled, the print screen 21, floating screen plate 22, and middle plate 23 are arranged sequentially from top to bottom. Opposite sides of the print screen 21 are secured within the receiving space 220 of the floating screen plate 22 by the screen pressing plate 24. The light shielding sheet 25 is installed between the print screen 21 and the floating screen plate 22 to cover the light leakage area between the print screen 21 and the middle plate 23, preventing excess curing within the trough assembly 30 caused by the light leakage, thereby improving printing accuracy and quality.

[0054] Furthermore, referring to Figures 3 to 6 , a mounting seat 231 is provided on the side of the middle plate 23 facing away from the screen floating plate 22. Within the mounting seat 231 is a receiving cavity 231 for accommodating the bracket assembly 71. The bracket assembly 71 is housed within the receiving cavity 230, making the structure of the stereolithography 3D printer 100 more compact and aesthetically pleasing. Furthermore, at least one leveling device 70 is provided, and the specific number can be adjusted based on actual needs. Each mounting seat 231 corresponds to each leveling device 70, that is, each mounting seat 231 corresponds to each bracket assembly 71. In one embodiment, if the print screen 21 is rectangular, two leveling devices 70 can be provided, with the two leveling devices 70 located on either side of the print screen 21, and two mounting seats 231 are provided on the middle plate 23 at positions corresponding to the bracket assemblies 71. Alternatively, three leveling devices 70 can be provided, with the three leveling devices 70 located outside different corners of the print screen 21, and three mounting seats 231 are provided on the middle plate 23 at positions corresponding to the bracket assemblies 71. As a preferred embodiment, referring to FIG3 , four leveling devices 70 may be provided, one located outside the four corners of the print screen 21. Four mounting brackets 231 are provided on the middle plate 23 at positions corresponding to the bracket assemblies 71. It will be appreciated that the specific distribution of the leveling devices 70 can be adjusted based on the actual structure, allowing the leveling devices 70 to adjust the tilt angle of the print screen 21 from different positions, thereby adjusting the distance between the print platform 61 and the print screen 21.

[0055] Furthermore, referring to Figures 3 to 6 , the leveling assembly 73 further includes a driving portion 731, a transmission portion 732, and a connecting portion 733. The bottom wall of the mounting base 231 defines a through-hole extending through the receiving cavity 230. The driving portion 731 of the leveling assembly 73 is secured to the bottom wall, while the transmission portion 732 of the leveling assembly 73 passes through the through-hole and connects to the connecting portion 733 of the leveling assembly 73. The driving portion 731 is connected to the controller; the connecting portion 733 is secured to the mounting portion 711; one end of the transmission portion 732 is connected to the driving portion 731, while the other end of the transmission portion 732 passes through the through-hole and is threadedly connected to the connecting portion 733. The driving portion 731 drives the transmission portion 732 to move, thereby pushing and / or pulling the screen floating plate 22 in the transmission direction of the transmission portion 732, thereby adjusting the distance between the printing platform 61 and the printing screen 21. As an embodiment, the driving part 731 is a motor, the transmission part 732 is a screw, and the connecting part 733 is a nut. The output shaft of the motor is transmission-connected to one end of the screw, and the other end of the screw is threadedly connected to the nut. The motor drives the screw to rotate, so that the screw and the nut rotate relative to each other, thereby creating a threaded pushing effect between the screw and the bracket assembly 71, pushing and / or pulling back the screen floating plate 22 in the transmission direction, thereby adjusting the distance between the printing platform 61 and the printing screen 21.

[0056] Referring to Figures 3 and 7 , the cantilever portion 712 is fixed to the side of the screen floating plate 22 away from the print screen 21. Furthermore, the cantilever portion 712 includes a first bent section 7121 and a second bent section 7122. The first bent section 7121 is connected to the mounting portion 711; the second bent section 7122 is connected to the first bent section 7121, and the second bent section 7122 is arranged parallel to and non-coplanar with the mounting portion 711. It can be understood that the cantilever portion 712 has an inverted "J" shape or a "concave" shape, and the bracket assembly 71 is secured by the second bent section 7122 fixedly connected to the side of the screen floating plate 22 away from the print screen 21.

[0057] Further, referring to FIG6 , the detection component 72 is provided on a side of the mounting portion 711 away from the receiving groove 713, and the specific installation position of the detection component 72 can also be adjusted according to the actual structure. Specifically, the detection component 72 is provided at the bottom of the mounting portion 711 and away from the receiving groove 713. When the bracket assembly 71 is deformed, the torque force received by the installation position of the detection component 72 is the largest, and the deformation amount is also the largest, which can more sensitively detect the deformation amount of the bracket assembly, thereby improving the leveling accuracy. The detection component 72 is provided in a one-to-one correspondence with the leveling component 73. To improve the detection accuracy, the detection component 72 is a strain gauge sensor, and specifically a full-bridge strain gauge can be used. When the full-bridge strain gauge detects deformation, its resistance value will change with the deformation amount, and the resistance change is converted into a voltage change.

[0058] Please refer to Figures 8 and 9. During the leveling process, the printing platform 61 drops to the lowest point. When the four corner areas of the printing platform 61 contact the upper surface of the printing screen 21 respectively, the downward pressure applied to the printing screen 21 will be transmitted to the bracket assembly 71 through the screen floating plate 22. At this time, the bracket assembly 71 is deformed under the action of the downward pressure. When the detection component 72 detects that the deformation of the bracket assembly 71 is greater than the preset value, it sends information to the controller. The controller controls the lifting component 50 to stop moving, thereby stopping the printing platform 61. Then, the current rotation angle of the driving unit 731 and the initial height value of the printing platform 61 are obtained. The relative height values ​​of the current four corners of the printing platform 61 and the contact position of the printing screen 21 can be calculated based on the rotation angle and the rotation angle. Before starting to formally print the first layer, the controller controls the driving unit 731 to drive the transmission unit 732 to move according to the relative height value of the printing platform 61 and the printing screen 21 obtained during the leveling process, so as to compensate for the height error between the printing platform 61 and the printing screen 21, so that the gap between the lower surface of the printing platform 61 and the upper surface of the printing screen 21 is maintained at a predetermined distance and parallel to each other, realizing automatic leveling operation, greatly reducing the probability of the first layer falling off during subsequent printing, and improving the printing success rate and printing quality while reducing manual operation errors.

[0059] Furthermore, referring to Figures 1 and 2 , the trough assembly 30 is detachably connected to the mid-plate assembly 20. The trough assembly 30 also includes a trough 31 detachably connected to the screen floating plate 22 and a release film (not shown) positioned adjacent to the print screen 21. This embodiment allows the trough assembly 30 to be leveled in conjunction with the screen floating plate 22, thereby improving printing accuracy and quality.

[0060] Furthermore, referring to Figures 1 and 2, the lifting assembly 50 also includes a profile 51, a first drive motor 52, a linear guide rail 53, a slider 54, a ball screw and nut 55, a bearing seat 56, a connecting arm 57 and a coupling 58. Among them, the first drive motor 52 is fixed to the lower surface of the middle plate 23 and connected to the controller, the profile 51 is fixed to the upper surface of the middle plate 23 and is located on one side of the trough assembly 30, and the profile 51 is internally provided with mounting grooves, and two sets of linear guide rails 53 are respectively fixed on the mounting grooves; two sets of bearing seats 56 are provided, one set is provided at the upper end of the profile 51, and the other set is provided at the lower end of the profile 51, the ball screw and the nut 55 are connected to the first drive motor 52 through the coupling 58, the slider 54 is provided corresponding to the linear guide rail 53, and is slidably connected to the linear guide rail 53, one end of the connecting arm 57 is fixedly connected to the slider 54 and the ball screw and the nut 55, and the other end is fixedly connected to the printing assembly 60; the first drive motor 52 drives the ball screw and the nut 55 to drive the slider 54, the connecting arm 57 and the printing assembly 60 to perform lifting and lowering movements along the linear guide rail 53 under the guide limit of the bearing seat 56, thereby ensuring the accuracy of the up and down movement of the printing platform 61. During the leveling process, when the detection component 72 detects that the deformation of the bracket component 71 is greater than a preset value, it sends information to the controller, and the controller controls the first drive motor 52 to stop moving, thereby stopping the printing platform 61.

[0061] Further, referring to Figures 1 and 2, the printing assembly 60 is arranged corresponding to the trough assembly 30 and is fixedly connected to the lifting assembly 50. The printing assembly 60 also includes a handle 62 and a screw 63. The handle 62 is connected to the printing platform 61, and the screw 63 is used to fix the handle 62 to the connecting arm 57. In this embodiment, there is no adjustment space reserved between the handle 62 and the printing platform 61. The screw 63 and the connecting arm 57 fix them together to avoid uneven gaps between the printing platform 61 and the printing screen 21 due to manual operation errors, thereby ensuring the printing effect of the first layer of the printed model, and the adhesion is firm and will not fall off, thereby improving the overall printing accuracy and success rate of the model.

[0062] 1 and 2 , the base plate assembly 10 includes a base plate 11, support columns 12, and foot pads 13. The foot pads 13 are fixed to the lower surface of the base plate 11, and the support columns 12 are fixed between the middle plate 23 and the base plate 11, forming the entire machine frame.

[0063] Further, referring to Figures 1 and 2, the above-mentioned light source assembly 40 also includes a first heat dissipation block 41 provided on the base plate 11, a first lamp board 42 provided on the first heat dissipation block 41, and a reflective cup 43 covered on the first lamp board 42. One end of the reflective cup 43 is connected to the first heat dissipation block 41, and the other end is connected to the screen floating plate 22, so that the light source assembly 40 can be leveled following the leveling of the printing screen 21, thereby achieving the first lamp board 42 and the printing screen 21 to remain in a relatively parallel position, thereby improving printing accuracy and print quality.

[0064] Figure 10 is a schematic diagram of the second structure of the light-curing 3D printer in an embodiment of the present application. It can be understood that the light source assembly 40 in Figure 10 is replaced by the light source assembly 40 in Figure 1. Please refer to Figures 10 and 11. The light source assembly 40 also includes a first bracket 401 connected to the middle plate 23, a second bracket 402 provided on the first bracket 401, an optical axis 403 provided on the first bracket 401, a bearing 404 passing through the optical axis 403 and slidingly connected to the optical axis 403, a second heat dissipation block 405 connected to the bearing 404, a second lamp board (not shown in the figure) provided on the second heat dissipation block 405, a light shield 407 provided on the second lamp board, and a second drive motor 408 provided on the second bracket 402 and connected to the optical axis 403. The second drive motor 408 is connected to the controller. The light source assembly 40 utilizes a mobile scanning light source. A second drive motor 408 drives a bearing 404, which in turn drives a second heat sink 405 to reciprocate along an optical axis 403. This in turn drives the second light panel and light shield 407 to move together, enhancing the light supply for curing the photocurable material used in the printed model. This configuration effectively reduces the overall height of the device, facilitating miniaturization of the photocurable 3D printer 100.

[0065] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A leveling device, characterized in that: Used for leveling a 3D printer, the 3D printer includes a mid-plate assembly with a printing screen, a printing assembly with a printing platform, and a controller, the leveling device includes: A bracket assembly, the bracket assembly comprising a mounting portion and cantilever portions symmetrically arranged on both sides of the mounting portion and respectively connected to the mounting portion, a receiving groove being formed between the mounting portion and the cantilever portions, and the cantilever portions being connected to the mid-plate assembly; a detection component, the detection component being provided on the support component and connected to the controller, the detection component being used to detect a deformation amount of the support component; and A leveling component is connected to the support component and the controller respectively, and is used to adjust the distance between the printing platform and the printing screen under the control of the controller.

2. The leveling device according to claim 1, characterized in that: The middle plate assembly includes a screen floating plate for fixing the printing screen and a middle plate connected to the screen floating plate. The middle plate is located on the surface of the screen floating plate away from the printing screen, and the cantilever portion is fixed to the side of the screen floating plate away from the printing screen.

3. The leveling device according to claim 2, characterized in that: The leveling assembly comprises: a driving unit, the driving unit being fixed to a side of the middle plate away from the screen floating plate and connected to the controller; a transmission part, one end of which is connected to the driving part; and A connecting portion is fixed to the mounting portion and is threadedly connected to the other end of the transmission portion to adjust the distance between the printing platform and the printing screen in the transmission direction of the transmission portion.

4. The leveling device according to any one of claims 1 to 3, characterized in that: The detection component is a full-bridge strain gauge.

5. The leveling device according to any one of claims 1 to 4, characterized in that: The cantilever portion comprises: a first bending section, the first bending section being connected to the mounting portion; The second bending section is connected to the first bending section, and the second bending section It is arranged parallel to and non-coplanar with the mounting portion.

6. The leveling device according to any one of claims 1 to 5, characterized in that: The detection component is arranged on a side of the mounting portion away from the accommodating groove.

7. A light-curing 3D printer, characterized in that: include: Controller; Base plate assembly; A middle plate assembly, the middle plate assembly being arranged on the bottom plate assembly and provided with a printing screen; A material trough assembly, the material trough assembly is used to accommodate the light-curing material and is supported by the middle plate assembly; A light source assembly; the light source assembly is disposed in the base plate assembly and is used to provide light for curing the light-curable material; a lifting assembly, the lifting assembly being arranged on the middle plate assembly and connected to the controller; A printing assembly, the printing assembly being arranged corresponding to the trough assembly and connected to the lifting assembly, the printing assembly including a printing platform; as well as A leveling device, wherein the leveling device is fixed to the middle plate assembly and connected to the controller, and adjusts the distance between the printing platform and the printing screen under the control of the controller; the leveling device includes a bracket assembly, a detection assembly and a leveling assembly; the bracket assembly includes a mounting portion and cantilever portions symmetrically arranged on both sides of the mounting portion and respectively connected to the mounting portion, a receiving groove is formed between the mounting portion and the cantilever portion, and the cantilever portion is connected to the middle plate assembly; the detection assembly is arranged on the bracket assembly and connected to the controller, and the detection assembly is used to detect the deformation of the bracket assembly; the leveling assembly is respectively connected to the bracket assembly and the controller, and the leveling assembly is used to adjust the distance between the printing platform and the printing screen under the control of the controller.

8. The light-curing 3D printer according to claim 7, characterized in that: The middle plate assembly includes: a screen floating plate for fixing the printing screen and a middle plate connected to the screen floating plate. The middle plate is located on the surface of the screen floating plate away from the printing screen. The bracket assembly of the leveling device is fixed to the side of the screen floating plate away from the printing screen.

9. The light-curing 3D printer according to claim 8, characterized in that: A mounting seat is provided on a side of the middle plate away from the screen floating plate, and a receiving cavity for accommodating the bracket assembly is provided inside the mounting seat. A through hole is provided on the bottom wall of the mounting seat that passes through the receiving cavity, and the driving part of the leveling assembly is fixed to the bottom wall, and the transmission part of the leveling assembly is passed through the through hole and connected to the connecting part of the leveling assembly.

10. The light-curing 3D printer according to claim 9, characterized in that: A through hole penetrating the receiving cavity is formed on the bottom wall of the mounting seat, the driving portion of the leveling assembly is fixed to the bottom wall, and the transmission portion of the leveling assembly is passed through the through hole and connected to the connecting portion of the leveling assembly.

11. The light-curing 3D printer according to claim 9 or 10, characterized in that: The light source assembly includes a first heat dissipation block arranged in the base plate assembly, a first lamp board arranged on the first heat dissipation block, and a reflective cup covered on the first lamp board. One end of the reflective cup is connected to the first heat dissipation block, and the other end is connected to the screen floating plate.

12. The light-curing 3D printer according to any one of claims 9 to 10, characterized in that: The light source assembly includes a first bracket connected to the middle plate, a second bracket arranged on the first bracket, an optical axis arranged on the first bracket, a bearing passing through the optical axis and slidably connected to the optical axis, a second heat dissipation block connected to the bearing, a second lamp board arranged on the second heat dissipation block, a light shield arranged on the second lamp board, and a drive motor arranged on the second bracket and connected to the optical axis.

13. The light-curing 3D printer according to any one of claims 7 to 12, characterized in that: The trough assembly is detachably connected to the middle plate assembly. The trough assembly further comprises a trough detachably connected to the screen floating plate and a release film disposed close to the printing screen.

14. The light-curing 3D printer according to any one of claims 7 to 13, characterized in that: The lifting assembly also includes a profile, a first drive motor, a linear guide, a slider, a ball screw and a nut, a bearing seat, a connecting arm and a coupling; the first drive motor is fixed to the lower surface of the middle plate and connected to the controller, the profile is fixed to the upper surface of the middle plate and is located on one side of the trough assembly, and mounting grooves are spaced apart inside the profile, and two sets of linear guides are provided, which are respectively fixed on the mounting grooves; two sets of bearing seats are provided, one set is provided at the upper end of the profile, and the other set is provided at the lower end of the profile, the ball screw and the nut are connected to the first drive motor through the coupling, the slider is provided corresponding to the linear guide and is slidably connected to the linear guide, one end of the connecting arm is fixedly connected to the slider, the ball screw and the nut, and the other end is fixedly connected to the printing assembly.

15. The light-curing 3D printer according to claim 14, characterized in that: The printing assembly is arranged corresponding to the trough assembly and is fixedly connected to the lifting assembly. The printing assembly also includes a handle and a screw. The handle is connected to the printing platform, and the handle is fixedly connected to the connecting arm through the screw.

16. The light-curing 3D printer according to any one of claims 7 to 15, characterized in that: The bottom plate assembly includes a bottom plate, a support column and a foot pad, the foot pad is fixed on the lower surface of the bottom plate, and the support column is fixed between the middle plate and the bottom plate.

17. The light-curing 3D printer according to any one of claims 7 to 16, characterized in that: The middle plate assembly includes a screen floating plate for fixing the printing screen and a middle plate connected to the screen floating plate. The middle plate is located on the surface of the screen floating plate away from the printing screen, and the cantilever portion is fixed to the side of the screen floating plate away from the printing screen.

18. The light-curing 3D printer according to claim 17, characterized in that: The leveling assembly comprises: a driving unit, the driving unit being fixed to a side of the middle plate away from the screen floating plate and connected to the controller; a transmission part, one end of which is connected to the driving part; and A connecting portion is fixed to the mounting portion and is threadedly connected to the other end of the transmission portion to adjust the distance between the printing platform and the printing screen in the transmission direction of the transmission portion.

19. The light-curing 3D printer according to any one of claims 7 to 18, characterized in that: The detection component is a full-bridge strain gauge.

20. The light-curing 3D printer according to any one of claims 7 to 19, characterized in that: The cantilever portion comprises: a first bending section, the first bending section being connected to the mounting portion; The second bending section is connected to the first bending section, and the second bending section is parallel to the mounting portion and is not arranged coplanarly.

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