Platform driving unit and 3D printing equipment applying same

Abstract

The embodiment of the utility model provides a platform driving unit and 3D printing equipment applying the same. The platform driving unit is used for driving a forming platform for 3D printing and comprises a fixing part used for fixing the platform driving unit; the connecting frame is movably connected with the fixing part, and the connecting frame is used for being connected with the forming platform so as to drive the forming platform to move; the driving assembly is in driving connection with the connecting frame and used for driving the connecting frame to move in at least one direction. The 3D printing equipment comprises a forming platform, a portal frame and any platform driving unit in the embodiment, the driving assembly is connected with the portal frame through the fixing part, and the forming platform is connected with the connecting frame and is movably arranged relative to the portal frame.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and in particular to a platform drive unit and a 3D printing device using the same. Background Art

[0002] 3D printing technology is a rapid prototyping technology that uses digital model files as a basis, and uses special wax materials, powdered metals, or plastics and other adhesive materials to print layers of materials to create three-dimensional objects. The printing material melts and is extruded at the nozzle, and finally forms the shape. The installation accuracy of the platform drive unit directly affects its printing accuracy. In the prior art, the platform drive unit and the nozzle drive are usually installed separately based on the base as the assembly reference. This causes a large variation in the relative accuracy of the platform drive unit and the nozzle drive, which directly affects the relative position accuracy of the nozzle assembly and the molding platform, and directly affects the printing accuracy of 3D printing. At the same time, the driving accuracy of the platform drive unit on the molding platform also directly affects the printing accuracy of 3D printing. How to solve the above problems is something that those skilled in the art need to consider. Utility Model Content

[0003] In order to solve the problems in the prior art, the embodiments of the present application provide a platform drive unit with higher installation accuracy and higher printing accuracy, and a 3D printing device using the same.

[0004] The embodiment of the present application provides a platform driving unit for driving a 3D printing forming platform, which includes:

[0005] A fixing portion, used to fix the platform driving unit;

[0006] a connecting frame, movably connected to the fixing portion, and configured to be connected to the forming platform to drive the forming platform to move;

[0007] A driving assembly is drivingly connected to the connecting frame and is used to drive the connecting frame to move in at least one direction.

[0008] In one embodiment, the driving assembly includes a driving portion and a transmission portion, the driving portion is in transmission connection with the transmission portion, and the transmission portion is connected to the connecting frame.

[0009] In one embodiment, the transmission portion includes a transmission belt, which is disposed around along a first direction and is fixedly connected to the connecting frame to drive the connecting frame to move along the first direction.

[0010] In one embodiment, the connecting frame includes a frame body and a connecting buckle, the connecting buckle is detachably connected to the frame body or movably connected to the frame body, and the connecting buckle fixes the transmission belt to the frame body.

[0011] In one embodiment, the transmission portion includes a transmission rod, which is extended along a first direction and is in transmission connection with the connecting frame to drive the connecting frame to move along the first direction.

[0012] In one embodiment, the transmission rod is a screw rod, and the connecting frame includes a frame body and a sleeve. The frame body is used to connect with the forming platform, and the sleeve is fixedly connected to the frame body. The sleeve is sleeved on the outer surface of the transmission rod and is transmission-connected to the transmission rod.

[0013] In one embodiment, the fixing portion has a first end and a second end spaced apart along a first direction, the driving portion is disposed at the first end, one side of the transmission portion is connected to the driving portion, and the other side of the transmission portion is connected to the second end.

[0014] In one embodiment, the platform driving unit further includes a guide member, which is connected to the fixed portion and extends along a first direction. The connecting frame includes a frame body and a limiting member that are connected together. The limiting member is slidably connected to the guide member, so that the connecting frame is movably connected to the fixed portion.

[0015] In one embodiment, a limiting groove is provided on the edge of the fixing portion, the guide member is an optical axis, the limiting member is a pulley, the guide member is arranged in the limiting groove, and the portion of the guide frame that is not covered by the limiting groove and is exposed is in sliding contact with the pulley.

[0016] An embodiment of the present application also provides a 3D printing device, which includes a forming platform, a gantry and a platform drive unit as described in any one of the aforementioned embodiments, wherein the drive assembly is connected to the gantry through the fixed portion, and the forming platform is connected to the connecting frame and is movably arranged relative to the gantry.

[0017] It is understood that the platform drive unit of the present application is fixed by the fixing portion, which realizes the positioning of the platform drive unit during the installation process, improves its installation accuracy, and thus improves its printing accuracy. The platform drive unit of the present application also includes a connecting frame movably connected to the fixing portion, and a drive assembly drivingly connected to the connecting frame. The drive assembly is used to drive the connecting frame to move in at least one direction to achieve stable linear motion of the forming platform and improve its printing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional schematic diagram of the cooperation between the platform driving unit and the forming platform provided in one embodiment of the present application.

[0019] Figure 2 A three-dimensional schematic diagram of a platform driving unit provided in one embodiment of the present application.

[0020] Figure 3 This is a schematic exploded perspective view of a platform drive unit provided in one embodiment of the present application.

[0021] Figure 4 A three-dimensional schematic diagram of a connecting frame of a platform drive unit provided in one embodiment of the present application.

[0022] Figure 5 for Figure 2 Schematic cross-sectional view along the VV direction.

[0023] Figure 6 A schematic diagram of the partial structure of an implementation of a platform drive unit provided in one embodiment of the present application.

[0024] Figure 7 A schematic diagram of the partial structure of another implementation of the platform drive unit provided in one embodiment of the present application.

[0025] Figure 8 This is a structural diagram of a platform driving unit provided in another embodiment of the present application.

[0026] Figure 9 for Figure 8 Schematic cross-sectional view along the IX-IX direction.

[0027] Figure 10 A three-dimensional schematic diagram of the 3D printing device provided in an embodiment of the present application.

[0028] Figure 11 A partial cross-sectional schematic diagram of the 3D printing device provided in an embodiment of the present application.

[0029] Description of main component symbols

[0030] Platform drive unit 10

[0031] Fixing portion 11

[0032] Mounting hole 110

[0033] First end portion 111

[0034] Second end portion 112

[0035] Limiting slot 113

[0036] Through hole 114

[0037] Drive assembly 12

[0038] First connection portion 121

[0039] Second connection portion 122

[0040] Driven wheel 1221

[0041] Limit sleeve 1222

[0042] Driving unit 123

[0043] Driving wheel 1231

[0044] Transmission unit 124

[0045] Transmission belt 1241

[0046] Transmission rod 1242

[0047] Connecting frame 13

[0048] Frame 131

[0049] Frame 1311

[0050] Connecting end 1312

[0051] Connecting buckle 132

[0052] Fixing 133

[0053] Limiting piece 134

[0054] Sleeve 135

[0055] Guide 14

[0056] 3D printing equipment 1

[0057] Base assembly 17

[0058] Forming platform 18

[0059] Gantry 19

[0060] Framework 191

[0061] Positioning structure 192

[0062] Positioning base plate 1921

[0063] Positioning side panel 1922

[0064] First direction Y

[0065] Second direction X

[0066] The third direction Z

[0067] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0068] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Similar figure numerals represent identical or similar components. The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit this application. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to also include plural forms. In addition, when used herein, "includes" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or their groups. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. Furthermore, unless explicitly defined herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0069] Generally, 3D printing technology is a rapid prototyping technology that uses digital model files as a basis, and uses special wax materials, powdered metals or plastics and other adhesive materials to print layers of materials to create three-dimensional objects. The printing material melts and is extruded at the nozzle, and finally forms the shape. The installation accuracy of the platform drive unit directly affects its printing accuracy. In the prior art, the platform drive unit and the nozzle drive are usually installed separately based on the base as the assembly reference, which makes the relative accuracy of the platform drive unit and the nozzle drive vary greatly, directly affecting the relative position accuracy of the nozzle assembly and the molding platform, and directly affecting the printing accuracy of 3D printing. At the same time, the driving accuracy of the platform drive unit on the molding platform also directly affects the printing accuracy of 3D printing. How to solve the above problems is what those skilled in the art need to consider.

[0070] Correspondingly, an embodiment of the present application provides a platform drive unit and a 3D printing device using the same. The platform drive unit is used to drive the 3D printing forming platform, and includes: a fixing portion, which is used to fix the platform drive unit; a connecting frame, which is movably connected to the fixing portion, and the connecting frame is used to connect to the forming platform to drive the forming platform to move; a driving assembly, which is drivably connected to the connecting frame and is used to drive the connecting frame to move in at least one direction. The 3D printing device includes a forming platform, a gantry, and a platform drive unit as described in any one of the aforementioned embodiments, the driving assembly is connected to the gantry through the fixing portion, and the forming platform is connected to the connecting frame and is movably arranged relative to the gantry.

[0071] Furthermore, the platform drive unit of the present application is fixed by a fixing portion, which enables the positioning of the platform drive unit during installation, improves its installation accuracy, and thus improves its printing accuracy. The platform drive unit of the present application also includes a connecting frame movably connected to the fixing portion, and a drive assembly drivingly connected to the connecting frame. The drive assembly is used to drive the connecting frame to move in at least one direction, achieving stable linear motion of the forming platform and improving its printing accuracy.

[0072] The following describes exemplary embodiments with reference to the accompanying drawings. It should be noted that the components depicted in the accompanying drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0073] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0074] like Figures 1 to 4 As shown, an embodiment of the present application provides a platform drive unit 10 for driving a 3D printing build platform 18. The platform drive unit 10 includes a fixing portion 11, a drive assembly 12, and a connecting frame 13. The fixing portion 11 is used to fix the platform drive unit 10. The connecting frame 13 is movably connected to the fixing portion 11 and is used to connect to the build platform 18 to drive the build platform 18 to move. The drive assembly 12 is drivingly connected to the connecting frame 13 to drive the connecting frame 13 to move in at least one direction.

[0075] In one embodiment, the fixing portion 11 may be the main positioning structure of the platform drive unit 10. By attaching the fixing portion 11 to an external structure (e.g., the gantry 19 of the 3D printing device 1), the platform drive unit 10 can be mounted and fixed. The drive assembly 12 and the fixing portion 11 have a relatively fixed positional relationship and / or connection. The installation and fixation of the fixing portion 11 can substantially stabilize the position of the drive assembly 12. The connecting frame 13 is used to connect the drive assembly 12 and the build platform 18. The drive assembly 12 enables the movement of the build platform 18, while the fixing portion 11 enables the positioning of the build platform 18.

[0076] As can be understood, the platform drive unit 10 of the present application is fixed by the fixing portion 11, which realizes the positioning of the platform drive unit 10 during the installation process, improves its installation accuracy, and thus improves its printing accuracy. The platform drive unit 10 of the present application also includes a connecting frame 13 that is movably connected to the fixing portion 11, and a driving assembly 12 that is transmission-connected to the connecting frame 13. The driving assembly 12 is used to drive the connecting frame 13 to move in at least one direction, thereby achieving stable linear motion of the forming platform 18 and improving its printing accuracy.

[0077] For ease of understanding, the embodiments of the present application introduce a first direction Y, a second direction X, and a third direction Z for description. The first direction Y, the second direction X, and the third direction Z are three non-parallel directions in a spatial coordinate system. In subsequent embodiments, the first direction Y, the second direction X, and the third direction Z are described as three mutually perpendicular reference directions in a three-dimensional Cartesian coordinate system. The directions shown in the embodiments of the present application are used to help understand the relative positional relationship of the various components, but do not limit their specific directions.

[0078] In one embodiment, the fixing portion 11 is substantially a profile, or can be understood as being substantially plate-shaped. The length direction of the fixing portion 11 corresponds to the first direction Y, the width direction of the fixing portion 11 corresponds to the second direction X, and the thickness direction of the fixing portion 11 corresponds to the third direction Z.

[0079] In one embodiment, the connecting frame 13 is movably connected to the fixing portion 11 and is capable of reciprocating motion along a first direction Y (lengthwise). Positioning along this direction can satisfy the range of motion of the connecting frame 13 and the forming platform 18. The portion of the drive assembly 12 that is used for driving can be correspondingly positioned along the first direction Y. Guide structures can be provided on opposite sides of the fixing portion 11 along a second direction X, through which the connecting frame 13 can be guided and connected to the fixing portion 11. Positioning along this direction can avoid interference with the movement of the connecting frame 13 along the first direction Y and achieve a mutually restrained connection between the connecting frame 13 and the fixing portion 11. The fixing portion 11 has a plurality of mounting holes 110 defined along a third direction Z. These holes are used to bolt the fixing portion 11 to the gantry 19 when the fixing portion 11 is stacked on the gantry 19 along the third direction Z (thicknesswise). Positioning the fixing portion 11 along this direction can help reduce the overall thickness of the device. As can be understood, a fixing portion 11 having this configuration achieves both high space efficiency and rich functionality.

[0080] In one embodiment, the driving assembly 12 includes a driving portion 123 and a transmission portion 124 . The driving portion 123 is in transmission connection with the transmission portion 124 , and the transmission portion 124 is connected to the connecting frame 13 .

[0081] It is understood that the driving portion 123 is a power source for driving, such as a motor capable of outputting rotational torque. The transmission portion 124 is a mechanism capable of converting the output torque of the driving portion 123 into linear motion of the connecting frame 13, such as a transmission belt or a transmission screw.

[0082] In one embodiment, the fixing portion 11 has a first end 111 and a second end 112 spaced apart along the first direction Y, the driving portion 123 is disposed at the first end 111 , one side of the transmission portion 124 is connected to the driving portion 123 , and the other side of the transmission portion 124 is connected to the second end 112 .

[0083] It is understood that the fixing portion 11 can be provided at one end of the fixing portion 11 and positioned and installed through the fixing portion 11. The transmission portion 124 extends along the first direction Y, corresponding to the long side of the fixing portion 11, thereby obtaining a relatively large stroke in a relatively limited space.

[0084] In this embodiment, the transmission portion 124 is shown as a belt transmission. In other embodiments, the transmission portion 124 may also be other transmission modes.

[0085] In one embodiment, the connecting frame 13 includes a frame body 131 and a stopper 134. It is understood that the frame body 131 is used to connect the transmission portion 124 and the forming platform 18. The transmission portion 124 drives the connecting frame 13 to move, thereby driving the forming platform 18 to move. The stopper 134 is connected to the frame body 131 and is configured to be in a guiding engagement with the fixing portion 11, thereby guiding the frame body 131 to the fixing portion 11, allowing the connecting frame 13 to be driven by the transmission portion 124 and, in turn, to drive the forming platform 18 to move.

[0086] In this embodiment, the frame 131 includes a frame 1311 extending generally along a plane defined by the first direction Y and the second direction X, and a connecting end 1312 connected to the frame 1311 and protruding along the third direction Z, facing away from the fixed portion 11 (or, more understandably, toward the forming platform). The frame 1311 is configured to connect to the transmission portion 124, and the connecting end 1312 is configured to connect to the forming platform 18. A stopper 134 is connected to the frame 1311 and disposed along the third direction Z on a side of the frame 1311 proximate to the fixed portion 11. The number of stoppers 134 may be multiple, with the multiple stoppers 134 being spaced apart along the second direction X.

[0087] It can be understood that at least one limit member 134 is provided on each side of the fixing portion 11 spaced apart along the second direction X, and the frame 1311 is clamped on the fixing portion 11 by at least two limit members 134 spaced apart along the second direction X; that is, it is arranged corresponding to the width direction (second direction X) of the fixing portion 11, which neither interferes with the travel of the connecting frame 13 along the first direction Y nor interferes with the connection and installation of the connecting frame 13 and the forming platform 18 along the third direction Z, thereby realizing a reasonable layout of various functional structures in a relatively limited space.

[0088] In one embodiment, the platform driving unit 10 further includes a guide member 14 connected to the fixing portion 11 and extending along the first direction Y. The limiting member 134 is slidably connected to the guide member 14 to movably connect the connecting frame 13 to the fixing portion 11 .

[0089] It is understandable that the guide member 14 and the limit member 134 can cooperate with each other along the second direction X so that the guide member 14 and the limit member 134 can abut against each other. At the same time, the guide member 14 and the limit member 134 can slide along the first direction Y, thereby guiding the connecting frame 13 and the fixing portion 11.

[0090] In one embodiment, the guide member 14 and the stopper 134 can cooperate in various ways. For example, the guide member 14 can be an optical axis that is protruding along the second direction X, and the stopper 134 can be a rotatable pulley having a groove disposed along the second direction X. Alternatively, the guide member 14 can be a structure that is recessed along the second direction X, and the stopper 134 can be a rotatable pulley having an outer peripheral edge that is protruding along the second direction X. Alternatively, both the guide member 14 and the stopper 134 can be structures that are recessed along the second direction X and can engage with each other.

[0091] In this embodiment, a recessed limiting slot 113 is defined on each side edge of the fixing portion 11, spaced apart along the second direction X. The lengthwise or extending direction of the limiting slot 113 corresponds to the first direction Y. A limiting member 134 is a pulley and is positioned on a side of the connecting frame 13 proximal to the fixing portion 11, along the third direction Z. Multiple limiting members 134 are rotatably connected to the connecting frame 13. The guide members 14 are optical axes, one of which is positioned in each limiting slot 113. The exposed portion of the guide member 14, corresponding to the optical axis and not covered by the limiting slot 113, is in sliding contact with the limiting member 134, corresponding to the pulley.

[0092] As can be understood, the provision of the guide member 14 and the stopper 134 in a guiding and mating relationship within the platform drive unit 10 can effectively enhance the stability of the platform drive unit 10 in driving the molding platform 18 in the first direction Y, thereby improving the accuracy of 3D printing. Furthermore, the placement of the stopper 134 and the fixing portion 11 in the same layer along the second direction X can reduce the overall thickness of the platform drive unit 10 along the third direction Z.

[0093] Further integration Figures 5 to 7 As shown, the driving assembly 12 of the platform driving unit 10 drives the forming platform 18 in a belt transmission manner.

[0094] In one embodiment, the transmission portion 124 includes a transmission belt 1241 , which is disposed in a loop along the first direction Y. The transmission belt 1241 is fixedly connected to the connecting frame 13 to drive the connecting frame 13 to move along the first direction Y.

[0095] In this embodiment, the drive assembly 12 further includes a first connecting portion 121 and a second connecting portion 122. The first connecting portion 121 is connected to the first end 111 of the fixed portion 11, and the second connecting portion 122 is connected to the second end 112 of the fixed portion 11. The first connecting portion 121 is generally a bracket, which is used to connect the drive portion 123 and connect it to the fixed portion 11. The second connecting portion 122 is generally a bracket with a rotatable driven pulley 1221. One end of the transmission portion 124 is sleeved on the driven pulley 1221, and the other end is sleeved on the driving pulley 1231 on the driving portion 123, so that the transmission belt 1241 extends along the first direction Y.

[0096] In this embodiment, a through hole 114 is defined within the fixing portion 11, extending therethrough in the first direction Y. A circumferential transmission belt 1241 includes at least two sections, both extending in the first direction Y. One section is disposed within the through hole 114, and the other section is disposed outside the through hole 114 and located on the side of the fixing portion 11 facing the connecting frame 13 to connect thereto. The portion of the transmission belt 1241 connecting the two sections is respectively connected to the driving pulley 1231 and the driven pulley 1221.

[0097] In one embodiment, the connecting frame 13 includes a frame body 131 and a connecting buckle 132. The connecting buckle 132 is detachably or movably connected to the frame body 131, and the connecting buckle 132 fixes the transmission belt 1241 to the frame body 131.

[0098] It can be understood that by cooperating with the driving part 123 to transmit the power, the forming platform 18 can be driven rapidly and steplessly, thereby improving the printing accuracy.

[0099] In this embodiment, if Figure 6 As shown, the connecting buckle 132 is detachably connected to the frame 1311 of the frame 131. The two ends of the connecting buckle 132 are connected to the frame 1311 by two fixing members 133. The connecting buckle 132 can be separated from the frame 1311 by removing the two fixing members 133 at the same time. The transmission belt 1241 is sandwiched between the connecting buckle 132 and the frame 1311.

[0100] In this embodiment, if Figure 7 As shown, the connecting buckle 132 is movably connected to the frame 1311 of the frame 131. One end of the connecting buckle 132 is connected to the frame 1311 and can be rotated so that the other end of the connecting buckle 132 is fixedly connected to the frame 1311 via a fixing member 133 or a snap connection. The transmission belt 1241 is sandwiched between the connecting buckle 132 and the frame 1311. Specifically, there are two connecting buckles 132, each of which is located on a side of the frame 1311 spaced apart along the first direction Y, with each connecting buckle 132 being located approximately in the middle of that side.

[0101] It can be understood that the connection buckle 132 provided with a detachable connection or a movable connection can effectively improve the installation convenience while fixing the transmission belt 1241.

[0102] Further integration Figure 8 and Figure 9 As shown, the driving assembly 12 of the platform driving unit 10 drives the forming platform 18 by screw transmission.

[0103] In one embodiment, the transmission portion 124 includes a transmission rod 1242 , which extends along the first direction Y. The transmission rod 1242 is in transmission connection with the connecting frame 13 , and is used to drive the connecting frame 13 to move along the first direction Y.

[0104] In this embodiment, the drive assembly 12 further includes a first connecting portion 121 and a second connecting portion 122. The first connecting portion 121 is connected to the first end 111 of the fixed portion 11, and the second connecting portion 122 is connected to the second end 112 of the fixed portion 11. The first connecting portion 121 is generally a bracket used to connect the drive portion 123 and connect it to the fixed portion 11. The second connecting portion 122 is generally a bracket with a limiting sleeve 1222. A transmission rod 1242 extends along the first direction Y and is rotatable. One end of the transmission rod 1242 is drivingly connected to the drive portion 123 and can rotate with the drive portion 123. The other end of the transmission rod 1242 is disposed within the limiting sleeve 1222, allowing it to rotate with minimal shaking.

[0105] In one embodiment, the transmission rod 1242 is a screw rod, and the connecting frame 13 includes a frame body 131 and a sleeve 135. The frame body 131 is used to connect to the molding platform 18, and the sleeve 135 is fixedly connected to the frame body 131. The sleeve 135 is sleeved on the outer surface of the transmission rod 1242 and is in transmission connection with the transmission rod 1242.

[0106] In this embodiment, the transmission rod 1242 is a screw having a circumferential external thread on its surface. The inner surface of the sleeve 135 is provided with a corresponding internal thread. The internal thread cooperates with the external thread to convert the rotation of the transmission rod 1242 into linear motion of the sleeve 135 along the first direction Y. The sleeve 135 is fixedly connected to the frame 1311 of the frame 131, so that the frame 1311 can be driven by the sleeve 135 to move linearly along the first direction Y, thereby driving the molding platform 18 to move along the first direction Y.

[0107] It can be understood that by driving the driving part 123 in cooperation with the transmission rod 1242, the forming platform 18 can be driven quickly and stably, thereby improving the printing accuracy.

[0108] Further integration Figures 10 and 11 As shown, the present embodiment further provides a 3D printing device 1, which includes a build platform 18, a gantry 19, and a platform drive unit 10 as described in any of the above embodiments. The drive assembly 12 is connected to the gantry 19 via a fixing portion 11, and the build platform 18 is connected to the connecting frame 13 and is movable relative to the gantry 19.

[0109] In one embodiment, the gantry 19 includes an integrally formed frame 191 and a positioning structure 192, which is disposed on the bottom edge of the frame 191. The positioning structure 192 includes a positioning base plate 1921, which is fixedly connected to the frame 191. The fixing portion 11 is disposed on the surface of the positioning base plate 1921 and is connected to the positioning base plate 1921.

[0110] As can be understood, the positioning structure 192 is integrally formed with the gantry 19, eliminating the need for redundant installation between the frame 191 and the positioning structure 192, resulting in a higher precision of the positioning structure 192 compared to the frame 191. The platform drive unit 10 is mounted and positioned with the positioning structure 192 via the fixing portion 11, enabling direct positioning of the platform drive unit 10, ensuring the positional accuracy of the platform drive unit 10 and the build platform 18 relative to the gantry 19, and thereby improving printing accuracy.

[0111] In one embodiment, the positioning structure 192 further includes positioning side plates 1922 . The two positioning side plates 1922 are respectively disposed on opposite sides of the positioning base plate 1921 along the second direction X to shield the side surfaces of the connecting frame 13 .

[0112] In one embodiment, the 3D printing device 1 further includes a base assembly 17 , and the base assembly 17 is connected to the gantry 19 via the platform driving unit 10 .

[0113] It is understood that the base assembly 17 can be used to accommodate other components of the 3D printing device 1, such as a display, control circuit, etc. The platform drive unit 10 is connected and positioned with the gantry 19 via the positioning structure 192. The base assembly 17 is connected to the platform drive unit 10 and then connected and positioned with the gantry 19, which can reduce installation difficulty and improve printing accuracy.

[0114] In this embodiment, to improve the space utilization of the 3D printing apparatus 1, the base assembly 17 and the platform drive unit 10 are embedded. That is, the platform drive unit 10 and the base assembly 17 are respectively connected and positioned with the gantry 19. The second drive assembly 12 and the base assembly 17 have approximately the same thickness along the third direction Z. At the same time, the platform drive unit 10 and the base assembly 17 are arranged substantially on the same layer, so that the platform drive unit 10 is embedded inside the base assembly 17 to save space and improve the aesthetics.

[0115] The specific embodiments of the present application have been described above with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions may be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. Such modifications and substitutions are intended to fall within the scope of the present application.

Claims

1. A platform driving unit for driving a 3D printing forming platform, characterized in that: The platform driving unit includes: A fixing portion, used to fix the platform driving unit; a connecting frame, movably connected to the fixing portion, and configured to be connected to the forming platform to drive the forming platform to move; A driving assembly is drivingly connected to the connecting frame and is used to drive the connecting frame to move in at least one direction.

2. The platform driving unit according to claim 1, wherein: The driving assembly includes a driving part and a transmission part. The driving part is in transmission connection with the transmission part, and the transmission part is connected to the connecting frame.

3. The platform driving unit according to claim 2, wherein: The transmission part includes a transmission belt, which is arranged to be wound along a first direction. The transmission belt is fixedly connected to the connecting frame and is used to drive the connecting frame to move along the first direction.

4. The platform driving unit according to claim 3, wherein: The connecting frame includes a frame body and a connecting buckle. The connecting buckle is detachably connected to the frame body or movably connected to the frame body. The connecting buckle fixes the transmission belt to the frame body.

5. The platform driving unit according to claim 2, wherein: The transmission part includes a transmission rod, which is extended along a first direction and is in transmission connection with the connecting frame for driving the connecting frame to move along the first direction.

6. The platform driving unit according to claim 5, wherein: The transmission rod is a screw rod, and the connecting frame includes a frame body and a sleeve. The frame body is used to connect with the forming platform, and the sleeve is fixedly connected to the frame body. The sleeve is sleeved on the outer surface of the transmission rod and is transmission-connected to the transmission rod.

7. The platform driving unit according to claim 2, wherein: The fixing portion has a first end and a second end spaced apart along a first direction. The driving portion is provided at the first end. One side of the transmission portion is connected to the driving portion, and the other side of the transmission portion is connected to the second end.

8. The platform driving unit according to claim 1, wherein: The platform driving unit also includes a guide member, which is connected to the fixed part and extends along the first direction. The connecting frame includes a frame body and a limiting member that are connected together. The limiting member is slidably connected to the guide member, so that the connecting frame is movably connected to the fixed part.

9. The platform driving unit according to claim 8, wherein: A limiting groove is provided on the edge of the fixing portion, the guide member is an optical axis, the limiting member is a pulley, the guide member is arranged in the limiting groove, and the portion of the guide frame that is not covered by the limiting groove and is exposed is in sliding contact with the pulley.

10. A 3D printing device, characterized in that: It includes a forming platform, a gantry and a platform driving unit according to any one of claims 1 to 9, wherein the driving assembly is connected to the gantry through the fixing portion, and the forming platform is connected to the connecting frame and is movably arranged relative to the gantry.

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