3D printer

Abstract

The present invention relates to the technical field of 3D printing, and in particular relates to a 3D printer. The 3D printer comprises a bottom housing assembly, comprising a printing screen; a shaping platform assembly, comprising a shaping platform; a driving assembly, connected to the bottom housing assembly and the shaping platform assembly, so as to drive the shaping platform assembly to move in a first direction relative to the bottom housing assembly; a distance sensor, provided on the bottom housing assembly and / or the shaping platform assembly, and used to determine whether or not the shaping platform is parallel to the printing screen by means of detecting the distances between multiple detection sites and the distance sensor; and an adjustment assembly, connected to the shaping platform assembly and used to adjust the shaping platform assembly on the basis of the detection result of the distance sensor. The 3D printer of the present application can implement automatic leveling, improving user experience as well as improving printing accuracy.

Description

3D printers

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on July 19, 2023, with application number 202321902979.2 and application name “3D Printer”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of 3D printing technology, and more specifically to a 3D printer. Background Art

[0003] 3D printing is a form of rapid prototyping technology. It uses a digital model file as a foundation and uses adhesive materials such as powdered metal or plastic to construct objects layer by layer. A stereolithography 3D printer typically uses a light source within a specific wavelength range to illuminate liquid photocurable resin, initiating a photochemical reaction. The resin solidifies from the liquid in the illuminated area. The build platform then rises one layer before curing the next. The newly cured layer firmly bonds to the previous one, and this cycle of layer-by-layer curing continues to produce the final object. The parallelism of the build platform with the horizontal plane is a key factor affecting printing accuracy and yield. Therefore, the build platform must be leveled before use.

[0004] In the prior art, the build platform is generally lowered to a position in contact with the print screen before printing, and leveled by tightening the screws of the adapter plate fixed to the build platform. However, during transportation or after repeated disassembly and assembly of the build platform assembly during long-term printing, the fixing screws used for leveling will loosen, requiring re-leveling, which is inconvenient.

[0005] Based on this, this field is in urgent need of a new 3D printer to solve the above technical problems.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems, a technical solution adopted in this application is:

[0008] A 3D printer is provided, comprising:

[0009] a bottom housing assembly, the bottom housing assembly including a print screen;

[0010] A forming platform assembly, wherein the forming platform assembly includes a forming platform, and a plurality of detection sites are provided on the forming platform and / or the bottom shell assembly;

[0011] a driving assembly, the driving assembly connecting the bottom shell assembly and the forming platform assembly, the driving assembly driving the forming platform assembly to move relative to the bottom shell assembly in a first direction;

[0012] a distance sensor, the distance sensor being provided on the bottom shell assembly and / or the building platform assembly and being used to detect the distance between the plurality of detection sites and the distance sensor to determine whether the building platform is arranged parallel to the printing screen; and

[0013] An adjustment component is connected to the forming platform component and is used to adjust the forming platform component in a first direction and / or a second direction according to the detection result of the distance sensor, and the first direction is perpendicular to the second direction.

[0014] Optionally, the distance sensor is provided on the bottom shell assembly, and at least three detection sites are provided on the forming platform assembly.

[0015] Optionally, three adjustment components are provided, each of which corresponds to a detection site, and each adjustment component is used to adjust the forming platform component at the corresponding detection site.

[0016] Optionally, in the first direction, the distance sensor is arranged on the central axis of the printing screen.

[0017] Optionally, the driving assembly includes a rotary driving member provided on the bottom shell assembly, a transmission rod connected to the rotating end of the rotary driving member, and a transmission block sleeved on the transmission rod and cooperatively connected to the transmission rod.

[0018] Optionally, the forming platform assembly further includes a platform fixing block provided on the forming platform; the adjustment assembly is connected between the platform fixing block and the transmission block to adjust the forming platform.

[0019] Optionally, the adjustment assembly includes a joint fixing block, and a platform motion block connected between the transmission block and the joint fixing block, one side of the joint fixing block is connected to one side of the platform fixing block through a first connecting member, and the other side of the joint fixing block is connected to the platform motion block through a second connecting member, so that the platform motion block can be detachably connected to the joint fixing block.

[0020] Optionally, the 3D printer further includes a guide assembly corresponding one-to-one to the drive assembly, the guide assembly including a guide profile, a linear guide rail and a slider, the guide profile being vertically arranged on the bottom shell assembly, the linear guide rail being arranged on the guide profile, and the slider being slidably connected to the linear guide rail and connected to the platform motion block.

[0021] Optionally, the number of the drive components is 3; the 3 drive components are distributed on the periphery of the forming platform in the form of an isosceles triangle.

[0022] Optionally, the distance sensor is provided on the forming platform assembly.

[0023] The beneficial effects of this application are as follows: the 3D printer of this application, by providing a distance sensor on the bottom shell assembly to detect the distance between the distance sensor and various detection points on the bottom surface of the build platform facing the distance sensor, thereby determining whether the build platform assembly is parallel to the printing screen, and then controlling the drive assembly to drive the build platform assembly to move up and down in coordination with the adjustment assembly, ultimately achieving leveling of the build platform assembly. The 3D printer of this application can achieve automatic leveling of the build platform, solving the technical problem of existing leveling methods requiring frequent manual re-leveling, effectively improving the user experience and increasing printing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is a schematic structural diagram of a 3D printer according to an embodiment of the present application;

[0026] FIG2 is a schematic diagram of the internal structure of a 3D printer according to an embodiment of the present application;

[0027] FIG3 is a cross-sectional view along plane AA of FIG1 ;

[0028] FIG4 is a schematic structural diagram of a molding platform according to an embodiment of the present application;

[0029] FIG5 is a schematic diagram of the leveling principle of an embodiment of the present application.

[0030] The meaning of the numbers in the accompanying drawings:

[0031] Bottom shell assembly-10; drive assembly-20; forming platform assembly-30, distance sensor-40; guide assembly-50; operation panel-60; adjustment assembly-70;

[0032] Top plate 11; bottom plate 12; side plate 13; material trough 14; printing screen 15; UV light panel 16, heat sink 17; reflector 18; rotary drive member 21; transmission rod 22; transmission block 23; forming platform 31; platform fixing block 32; joint fixing block 71; first connecting member 72; connecting portion 721; spherical portion 722; second connecting member 73; platform moving block 74; handle 33; guide profile 51; linear guide rail 52; slider 53.

[0033] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0034] 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.

[0035] The terms "first", "second" and "third" in this application are only used for descriptive purposes 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment 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.

[0037] Referring to Figures 1-3, Figure 1 is a schematic diagram of the structure of a 3D printer according to an embodiment of the present application; Figure 2 is a schematic diagram of the internal structure of the 3D printer according to an embodiment of the present application; and Figure 3 is a cross-sectional view taken along plane AA of Figure 1. The 3D printer includes a bottom housing assembly 10, a drive assembly 20, a build platform assembly 30, a distance sensor 40, a guide assembly 50, an operation panel 60, and an adjustment assembly 70.

[0038] Wherein, the bottom shell assembly 10 includes a printing screen 15, and the printing screen is arranged horizontally 15;

[0039] The forming platform assembly 30 is disposed above the bottom shell assembly 10 , and the forming platform assembly 30 includes a forming platform 31 . A plurality of detection sites are disposed on the forming platform 31 and / or the bottom shell assembly 10 ;

[0040] The driving assembly 20 is connected to the bottom shell assembly 10 and the forming platform assembly 30, and the driving assembly 20 drives the forming platform assembly to move relative to the bottom shell assembly in a first direction;

[0041] The distance sensor 40 is provided on the bottom shell assembly 10 and / or the building platform assembly 30, and is used to determine whether the building platform 31 is arranged parallel to the printing screen 15 by detecting the distance between the multiple detection points and the distance sensor 40; optionally, the distance sensor 40 is an infrared ranging probe;

[0042] The adjustment assembly 70 is connected to the forming platform assembly 30 and is used to adjust the forming platform assembly 30 in a first direction and / or a second direction according to the detection result of the distance sensor, where the first direction is perpendicular to the second direction.

[0043] During normal printing operations, the plurality of driving assemblies 20 move synchronously to jointly drive the forming platform assembly 30 to move up and down.

[0044] When leveling is required, the distance sensor 40 detects the distance from the distance sensor 40 to each detection point of the forming platform 31, and determines whether the heights of various areas of the forming platform 31 relative to the printing screen 15 are consistent based on the detected distance. If they are consistent, the forming platform 31 is parallel to the printing screen 15, and it is directly determined that they have been leveled. If they are inconsistent, it means that the forming platform 31 and the printing screen 15 are not parallel to each other. The compensation height is further calculated, and based on the obtained compensation height, the drive component 20 adjusts the height of the deviated area of ​​the forming platform 31 separately, so that the forming platform 31 is parallel to the printing screen 15. In general, the leveling process is to change the angle between the forming platform component 30 and the horizontal direction through the relative movement of each of the drive components 20 until the bottom surface of the forming platform 31 is parallel to the printing screen 15.

[0045] The 3D printer of the embodiment of the present application detects the distance between the building platform 31 and the distance between the building platform 31 and the distance sensor 40 in real time, and then monitors in real time whether the building platform 31 is parallel to the printing screen 15; then the driving component 20 and the adjusting component 70 level the building platform component 30 according to the distance detected by the distance sensor 40, so that the 3D printer of the present application realizes automatic leveling, which solves the technical problem that the existing leveling method requires frequent manual re-leveling, effectively improves the user experience, and also improves the printing accuracy.

[0046] Thus, the 3D printer of the present application, by providing a distance sensor 40 on the bottom housing assembly 10 to detect the distance from the distance sensor 40 to each detection point on the bottom surface of the build platform 31 facing the distance sensor 40, thereby determining whether the build platform assembly 30 is parallel to the print screen 15. The 3D printer of the present application then controls the drive assembly 20 to drive the build platform assembly 30 to move up and down in coordination with the adjustment assembly 70, ultimately achieving leveling of the build platform assembly 30. The 3D printer of the present application can achieve automatic leveling of the build platform 31, resolving the technical problem of existing leveling methods requiring frequent manual re-leveling, effectively improving the user experience and increasing printing accuracy.

[0047] In some embodiments, the distance sensor 40 is located on the bottom housing assembly 10, and at least three detection sites are provided on the build platform 31. Specifically, there are three detection sites, including a first detection site corresponding to the central axis of the print screen 15, and second detection sites symmetrically located on either side of the first detection site. The distribution of these detection sites enables the distance sensor 40 to comprehensively detect the distance between different areas of the build platform 31 and the build platform 31, ensuring accurate detection of the build platform 31 status and subsequent precise leveling of the build platform 31.

[0048] There are three adjustment components 70 , each of which corresponds to a detection site. Each adjustment component 70 is used to adjust the forming platform component 30 at the corresponding detection site.

[0049] Furthermore, in the first direction, the distance sensor 40 is arranged on the central axis of the printing screen 15, so that when the forming platform 31 is arranged parallel to the printing screen 15, the distance between the second detection point and the distance sensor 40 is equal, ensuring the accuracy of leveling.

[0050] As shown in Figure 2 , the drive assembly 20 includes a rotary drive member 21 mounted on the bottom housing assembly 10, a transmission rod 22 connected to the rotating end of the rotary drive member 21, and a transmission block 23 sleeved on and matingly connected to the transmission rod 22. Furthermore, referring specifically to Figure 4 , the building platform assembly 30 also includes a platform fixing block 32 mounted on the building platform 31; the adjustment assembly 70 is connected between the platform fixing block 32 and the transmission block 23 to adjust the building platform 31.

[0051] 3 and 4 , the adjustment assembly 70 includes a joint fixing block 71 and a platform motion block 74 connected between the transmission block 23 and the joint fixing block 71 . One side of the joint fixing block 71 is connected to one side of the platform fixing block 32 via a first connecting member 72 , and the other side of the joint fixing block 71 is connected to the platform motion block 74 via a second connecting member 73 , so that the platform motion block 74 is detachably connected to the joint fixing block 71 .

[0052] Optionally, the connection between the joint fixing block 71 and the platform motion block 74 adopts a stepped connection to improve the connection stability between the joint fixing block 71 and the platform motion block 74. Specifically, the end of the joint fixing block 71 facing the platform motion block 74 is provided with a first step, and the end of the platform motion block 74 facing the joint fixing block 71 is provided with a second step that cooperates with the first step. After the first step and the second step are connected, the second connecting member 73 is provided through the first step and the second step.

[0053] During use, based on the detection result of the distance sensor 40, the driving assembly 20 and the adjusting assembly 70 cooperate to deflect the forming platform assembly 30 relative to the printing screen 15 to level the forming platform assembly 30, so that the forming platform 31 and the printing screen 15 are arranged in parallel.

[0054] Specifically, as shown in FIG3 , in some embodiments, the first connecting member 72 is arranged in a vertical direction, and the first connecting member 72 includes a connecting portion 721 and a spherical portion 722 provided at one end of the connecting portion 721. The connecting portion 721 is fixedly connected to the joint fixing block 71, and the platform fixing block 32 is provided with a groove matching the spherical portion 722. The spherical portion 722 is movably engaged with the groove, and the spherical portion 722 can rotate in all directions within the groove. The mating structure of the spherical portion 722 and the groove can be a universal ball bearing. The second connecting member 73 can be a hand screw, and the hand screw is respectively arranged in a vertical direction through the joint fixing block 71 and the platform motion block 74. The joint fixing block 71 and the platform motion block 74 are respectively provided with a coaxially arranged connecting hole for the hand screw to pass through. The connecting hole is threadedly engaged with the hand screw, so that the joint fixing block 71 and the platform fixing block 74 are fixed to each other.

[0055] The purpose of providing the second connecting member 73 is to remove the second connecting member 73 after printing is completed, disassemble the platform motion block 74 from the joint fixing block 71, and then remove the build platform 31 and take out the printed product. Specifically, to facilitate the removal of the build platform 31, the build platform assembly 30 also includes a handle 33 located on the side of the build platform 31 away from the bottom housing assembly 10.

[0056] During leveling, the driving assembly 20 drives the forming platform assembly 30 to rise and fall vertically to a leveling position, and the adjusting assembly 70 is movably connected to the forming platform 31 so that the forming platform 31 is adjusted to be parallel to the printing screen 15.

[0057] Specifically, when leveling is required, the driving assembly 20 drives the corresponding joint fixing block 71 to move up and down in the vertical direction, and the joint fixing block 71 drives the second connecting member 72 to move up and down, thereby driving the forming platform 31 to deflect relative to the printing screen 15.

[0058] Optionally, the transmission rod 22 and the transmission block 23 are a screw-nut assembly, wherein the transmission rod 22 may be a screw and the transmission block 23 may be a nut that is mated to the screw. In other embodiments, the drive assembly 20 may also utilize a linear motor to achieve the effect of driving the joint fixing block 71 to rise and fall. It is understood that other drive assembly 20 structures that achieve the same effect of driving the joint fixing block 71 to rise and fall as described in this application are all conventional options based on this application.

[0059] When leveling is required, the drive assembly 20 drives the corresponding joint fixing block 71 to move vertically. The joint fixing block 71 drives the second connecting member 72 to move upward and downward, thereby causing the forming platform 31 to deflect relative to the printing screen 15. Specifically, the rotary drive member 21 rotates, driving the transmission rod 22 to rotate, which in turn drives the transmission block 23 connected to the transmission rod 22 to move on the transmission rod 22, thereby driving the platform movement block 74 connected to the transmission block 23 to move upward and downward, thereby driving the platform movement through the joint fixing block 71.

[0060] 1 to 3 , the 3D printer further includes a guide assembly 50 corresponding one-to-one to the drive assembly 20 . The guide assembly 50 includes a guide profile 51 , a linear guide rail 52 , and a slider 53 . The guide profile 51 is vertically disposed on the bottom shell assembly 10 , the linear guide rail 52 is disposed on the guide profile 51 , and the slider 53 is slidably connected to the linear guide rail 52 and connected to the platform motion block 74 .

[0061] The guide assembly 50 is connected to the platform motion block 74. When the driving assembly 20 drives the forming platform assembly 30 to move up and down, the stability of the lifting and lowering movement of the platform motion block 74 is improved, thereby improving the stability of the movement of the forming platform assembly 30 and ensuring the stability of the overall operation of the 3D printer.

[0062] Specifically, the number of the driving components 20 is three; the three driving components 20 are distributed on the periphery of the forming platform 31 in the shape of an isosceles triangle.

[0063] Two drive assemblies 20 are located on the first side of the molding platform 31, and one drive assembly 20 is located on the second side of the molding platform 31. The first side and the second side are opposite each other, and the drive assembly 20 located on the second side is located at a position corresponding to the centerline of the two drive assemblies 20 located on the first side. It is understood that the number of adjustment assemblies 70 provided corresponds one-to-one with the number of drive assemblies 20, and the number of adjustment assemblies 70 is also three; the number of platform fixing blocks 32 is also three.

[0064] 2 and 3 , the bottom housing assembly 10 includes a top plate 11, a bottom plate 12, a side plate 13, a material trough 14, a printing screen 15, a UV light panel 16, a heat sink 17, and a reflective cup 18. The top plate 11, the bottom plate 12, and the side plate 13 enclose a receiving cavity. The material trough 14 is provided on the side of the top plate 11 facing the forming platform 31. The UV light panel 16, the heat sink 17, and the reflective cup 18 are provided in the receiving cavity. The heat sink 17 is provided on the side of the bottom plate 12 facing the material trough 14. The UV light panel 16 is provided on the heat sink 17. The printing screen 15 is provided on the top plate 11 and is arranged horizontally. The reflective cup 18 is provided between the UV light panel 16 and the printing screen 15. Specifically, in some embodiments, the distance sensor 40 is provided on the heat sink 17 of the bottom housing assembly 10. Specifically, the UV light panels 16 are arranged in 1 column and 5 rows, with a total of 2 sets, fixed at a certain angle on the heat sink 17. The distance sensor 40 is provided on the heat sink 17, and the plane where the distance sensor 40 is located is parallel to the printing screen 15.

[0065] Furthermore, the 3D printer described in the present application also includes an electronic control component, which includes a control main board and an operation panel 60 provided on the side panel 13; the electronic control component is electrically connected to the drive component 20 and the distance sensor 40 respectively; during the leveling operation, the electronic control component receives the distance information detected by the distance sensor 40, analyzes the distance information, and controls the drive component 20 to move the forming platform component 30, so that the drive component 20 and the adjustment component 70 cooperate with each other to level the forming platform component 30, so that the forming platform 31 and the printing screen 15 remain balanced.

[0066] In some other embodiments, the distance sensor 40 is disposed on the forming platform assembly 30. When in use, the distance sensor 40 measures the distance between the detection point and the detection point through light reflection.

[0067] The leveling process of the 3D printer described in this application includes the following steps:

[0068] The distance sensor 40 measures the distance from each detection point on the build platform 31 in real time. Based on the detected distance, the build platform 31 is determined to be parallel to the print screen 15. The vertical distance H between the detection point and the plane on which the distance sensor 40 is located is calculated based on the detected distance value L and the angle A between the line connecting each detection point and the distance sensor 40 and the vertical direction. The specific calculation formula is: H = cos A * L. By determining whether the height H of each detection point is equal, the build platform 31 can be determined to be parallel to the print screen 15.

[0069] If they are equal, they are parallel and no leveling is required.

[0070] If they are not equal, they are not parallel and need to be leveled. Since leveling generally involves setting the molding platform to a distance of 0.1 mm from the print screen 15, the purpose is to facilitate the subsequent direct start of the printing step. Therefore, optionally, during the leveling process, the lowest detection point is used as a reference point, and the molding platform is leveled by controlling the lowering of other detection points. Specifically, based on the vertical distance H between the obtained detection point and the plane where the distance sensor 40 is located, the other detection points are adjusted with the detection point with the smallest vertical distance to the plane of the distance sensor 40 as the reference point.

[0071] As shown in Figure 5, when two of the three detection points are not on the same horizontal plane: the minimum distance of the forming platform 31 relative to the plane where the distance sensor 40 is located is determined according to the vertical distance values ​​obtained by the above method, and is recorded as H1, and the maximum distance is recorded as H2. The compensation height △H is calculated according to the difference between H1 and H2; then, with the detection point corresponding to the lowest point as the reference point, the drive component 30 is controlled to drive the area of ​​the forming platform 31 corresponding to the detection point corresponding to the highest point to descend to the same plane as the lowest point, thereby keeping the bottom surface of the forming platform 31 parallel to the printing screen 15. When the three detection points are not on the same horizontal plane: the distance sensor 40 detects the distances L1, L2, and L3 between the distance sensor 40 and the three detection points 1, 2, and 3 on the bottom surface of the forming platform 31 in real time, and calculates the heights H1, H2, and H3 of the detection points relative to the base plate 12 based on the angles between the lines connecting the three detection points and the distance sensor 40 and the vertical direction. If the calculated heights H1, H2, and H3 are not equal, it is determined that the three detection points are not on the same horizontal plane. At this time, there are two leveling methods: one is to use one of the detection points as a reference point, for example, the lowest point as a reference point, and calculate the height differences △H1 and △H2 between it and the other two detection points respectively, and control the other two drive components 20 to drive the forming platform 31 area to rise or fall to the corresponding compensation height to complete the leveling; the other is to first level two of the detection points, and then level the third detection point.

[0072] The above descriptions are only some embodiments of the present application and do not limit the scope of protection of the present application. Any equivalent device 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 scope of patent protection of this application.

Claims

1. A 3D printer, characterized in that: include: a bottom housing assembly, the bottom housing assembly including a print screen; A molding platform assembly, the molding platform assembly comprising a molding platform, and a plurality of detection sites are provided on the molding platform and / or the bottom shell assembly; A driving assembly, wherein the driving assembly is connected to the bottom shell assembly and the forming platform assembly, and the driving assembly drives the forming platform assembly to move in a first direction relative to the bottom shell assembly; A distance sensor, which is disposed on the bottom shell assembly and / or the forming platform assembly and is used to detect the distance between the detection site and the distance sensor to determine whether the forming platform is arranged parallel to the printing screen; And, an adjustment component, which is connected to the molding platform component and is used to adjust the molding platform component in a first direction and / or a second direction according to the detection result of the distance sensor, and the first direction is perpendicular to the second direction.

2. The 3D printer according to claim 1, characterized in that: The distance sensor is arranged on the bottom shell component, and at least three detection sites are arranged on the forming platform component.

3. The 3D printer according to claim 2, characterized in that: There are three adjustment components, each of which is arranged corresponding to a detection site, and each of the adjustment components is used to adjust the forming platform component at the corresponding detection site.

4. The 3D printer according to claim 3, characterized in that: In the first direction, the distance sensor is arranged on the central axis of the printing screen.

5. The 3D printer according to any one of claims 1 to 4, characterized in that: The driving assembly comprises a rotary driving member arranged on the bottom shell assembly, a transmission rod connected to the rotating end of the rotary driving member, and a transmission block sleeved on the transmission rod and cooperatively connected with the transmission rod.

6. The 3D printer according to claim 5, characterized in that: The molding platform assembly also includes a platform fixing block arranged on the molding platform; the adjustment assembly is connected between the platform fixing block and the transmission block to adjust the molding platform.

7. The 3D printer according to claim 6, characterized in that: The adjustment assembly includes a joint fixing block, and a platform motion block connected between the transmission block and the joint fixing block, one side of the joint fixing block is connected to one side of the platform fixing block through a first connecting member, and the other side of the joint fixing block is connected to the platform motion block through a second connecting member, so that the platform motion block can be detachably connected to the joint fixing block.

8. The 3D printer according to claim 7, characterized in that: The 3D printer also includes a guide assembly corresponding to the drive assembly one by one, the guide assembly includes a guide profile, a linear guide rail and a slider, the guide profile is vertically arranged on the bottom shell assembly, the linear guide rail is arranged on the guide profile, and the slider is slidably connected to the linear guide rail and connected to the platform motion block.

9. The 3D printer according to claim 2, characterized in that: The number of the drive components is 3; the three drive components are distributed on the periphery of the forming platform in an isosceles triangle.

10. The 3D printer according to any one of claims 1 to 9, characterized in that: The distance sensor is arranged on the forming platform assembly.

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