Construction platform and 3D printing equipment

Abstract

The invention provides a construction platform and 3D printing equipment, the construction platform comprises a platform assembly and a connecting assembly, the platform assembly is configured to allow liquid resin to be irradiated by an energy source to form a curing layer, and the platform assembly comprises a first platform and a second platform; the first platform and the second platform are constructed to be capable of relatively moving in the first direction and used for enabling the curing layer formed on the platform assembly to fall off; one end of the connecting assembly is connected to a moving assembly, the other end of the connecting assembly is movably connected with the first platform and the second platform, and the connecting assembly is used for driving the first platform and the second platform to move in the first direction.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and particularly to a building platform and a 3D printing device. Background Art

[0002] Most of the printing platforms of stereolithography 3D printing devices are separate components. After the printed part is formed on the printing platform, it is not easy to separate from the printing platform. Tools such as a squeegee are needed to separate the printed part from the printing platform, which can easily damage the printed part. Summary of the Invention

[0003] This application provides a building platform and a 3D printing device to solve the problem that the printed part is not easy to separate from the printing platform in the known technology.

[0004] In a first aspect, this application provides a building platform, including a platform component and a connection component. The platform component is configured to allow a liquid resin to be irradiated by an energy source to form a cured layer. The platform component includes a first platform and a second platform. The first platform and the second platform are configured to be able to move relative to each other in a first direction for detaching the cured layer formed on the platform component. One end of the connection component is connected to a moving component, and the other end of the connection component is movably connected to the first platform and the second platform for driving the first platform and the second platform to move in the first direction.

[0005] In a possible implementation, one of the first platform and the second platform is provided with a convex portion, and the other of the first platform and the second platform is provided with a through hole. Along the first direction, the convex portion is movably inserted into the through hole.

[0006] In a possible implementation, a reflux channel is formed between at least a part of the outer peripheral surface of the convex portion and the inner peripheral surface of the through hole. The reflux channel is configured to allow the liquid resin flowing into the through hole to flow back into the material tank, and the material tank is configured to store the liquid resin.

[0007] In a possible implementation, the outer peripheral surface of the convex portion and the inner peripheral surface of the through hole are spaced apart to form the reflux channel between the outer peripheral surface of the convex portion and the inner peripheral surface of the through hole.

[0008] In a possible implementation, along a second direction, at least one side of the convex portion is provided with a guiding surface. The second direction intersects the first direction. Along the first direction, the guiding surface extends obliquely from its end far from the material tank to the side far from the convex portion to the end of the guiding surface close to the material tank for guiding the liquid resin to flow back into the material tank; or, Along a third direction, at least one side of the protrusion is provided with a guide surface, and the third direction intersects with the first direction. Along the first direction, the guide surface extends obliquely from an end away from the material trough toward a side away from the protrusion to an end of the guide surface close to the material trough, for guiding the liquid resin to flow back into the material trough.

[0009] In a possible implementation, along the second direction, a guide surface is provided on the hole wall of at least one side of the through hole, the second direction intersects with the first direction, and along the first direction, the guide surface extends obliquely from an end thereof away from the material groove toward a side close to the convex portion to an end of the guide surface close to the material groove, so as to guide the liquid resin to flow back into the material groove; or, Along a third direction, a guide surface is provided on the hole wall on at least one side of the through hole, and the third direction intersects with the first direction. Along the first direction, the guide surface extends obliquely from an end away from the material trough toward a side close to the convex portion to an end of the guide surface close to the material trough, so as to guide the liquid resin to flow back into the material trough.

[0010] In a possible implementation, along the first direction, an active cavity is provided at one end of the first platform, and the second platform is movably disposed in the active cavity; The through hole is arranged at the other end of the first platform along the first direction, and the convex portion is arranged at one end of the second platform close to the bottom wall of the active cavity.

[0011] In a possible embodiment, the building platform further includes a demolding structure, which is transmission-connected to one of the first platform and the second platform, and is configured to drive one of the first platform and the second platform to move relative to the other along the first direction.

[0012] In a possible implementation, along the third direction, the demoulding structure is at least provided on one side of the first platform, and the demoulding structure is rotatably connected to the first platform, the second platform is at least partially located on a rotation path of the demoulding structure, and the third direction intersects with the first direction; Wherein, based on the rotation of the demoulding structure relative to the first platform, the demoulding structure can drive the second platform to move relative to the first platform along the first direction.

[0013] In a possible implementation, the demoulding structure includes a rotating handle, a first rotating shaft, and a second rotating shaft; The first platform is provided with a first demolding hole and a second demolding hole. Along the second direction, the first demolding hole and the second demolding hole are arranged at intervals. The second direction intersects with the first direction. Along the first direction, the extension length of the second demolding hole is greater than that of the first demolding hole; The second platform is provided with a third demolding hole and a fourth demolding hole. Along the second direction, the third demolding hole and the fourth demolding hole are arranged at intervals. Along the first direction, the extension length of the third demolding hole is greater than that of the fourth demolding hole; The first rotating shaft passes through the third demolding hole and the first demolding hole, and the second rotating shaft passes through the fourth demolding hole and the second demolding hole; The rotating handle can rotate relative to the platform assembly, and the rotating handle is connected to the first rotating shaft and the second rotating shaft.

[0014] In a possible implementation manner, the number of the demolding structures is set to two. Along the third direction, the two demolding structures are respectively arranged on both sides of the platform assembly; Along the second direction, the platform assembly defines a first side and a second side that are arranged oppositely. The first demolding hole corresponding to one demolding structure is located on the side of the second demolding hole close to the first side, and the corresponding third demolding hole is located on the side of the fourth demolding hole close to the first side; The first demolding hole corresponding to the other demolding structure is located on the side of the second demolding hole away from the first side, and the corresponding third demolding hole is located on the side of the fourth demolding hole away from the first side.

[0015] In a possible implementation manner, the connection assembly includes: A support frame, one end of which is connected to the moving assembly; A movable member, which is movably connected to the support frame along the first direction; Wherein, both the first platform and the second platform are at least partially clamped between the other end of the support frame away from the moving assembly and the movable member.

[0016] In a possible implementation manner, the building platform further includes an unlocking assembly. The unlocking assembly is movably connected to the support frame, and the unlocking assembly is configured to abut against the movable member to move away from the support frame.

[0017] In a possible implementation manner, the first platform includes a first main body portion and a first extension portion. The first extension portion is connected to the first main body portion, and the first extension portion is at least partially clamped between the support frame and the movable member; Among them, the number of the first extension parts is set to two. Along the third direction, the two first extension parts are arranged at intervals, and an activity cavity is formed between the two first extension parts. The third direction intersects with the first direction, and the second platform is movably arranged in the activity cavity; At least part of the support frame is arranged between the two first extension parts, and the two first extension parts respectively abut against opposite sides of the support frame along the third direction.

[0018] In a possible implementation manner, the second platform includes a second main body part and a second extension part. The second extension part is connected to the second main body part, and at least part of the second extension part is clamped between the support frame and the movable part; A positioning groove is provided on the first extension part. Along the third direction, one end of the second extension part abuts against the support frame, and the other end thereof extends into the positioning groove and abuts against the side wall of the positioning groove; Among them, along the second direction, opposite sides of the section of the second extension part extending into the positioning groove respectively abut against the side walls of the positioning groove. The second direction intersects with the first direction and the third direction.

[0019] In a second aspect, an embodiment of the present application further provides a 3D printing device, including a moving component, a material tray component, and the above-mentioned building platform. The moving component is connected to the connection component of the building platform to drive the platform component of the building platform to approach or move away from the material tray component along the first direction.

[0020] In a possible implementation manner, a limiting part is provided on the side wall of the platform component. A limiting surface is provided at one end of the limiting part facing the material tray component, and a forming surface is provided at one end of the platform component facing the material tray component; A material groove is formed at one end of the material tray component facing the platform component. A first distance between the limiting surface and the end surface of the material tray component facing the platform component is smaller than a second distance between the forming surface and the bottom wall of the material groove.

[0021] For the building platform of the present application, the platform component is set as a composite structure composed of a first platform and a second platform, and the cured layer formed on the platform component is detached from the platform component through the relative movement of the first platform and the second platform, improving the extraction efficiency of the cured layer and avoiding damage to the cured layer caused by using tools such as a squeegee. In addition, in the present application, the first platform and the second platform are directly connected through the connection component and then driven to move synchronously, without setting other connection structures between the first platform and the second platform to connect the two, simplifying the structure of the building platform. Description of the Drawings

[0022] Figure 1Schematic structural diagram of the construction platform of the present application in an embodiment.

[0023] Figure 2 Schematic structural diagram of the platform components of the construction platform of the present application in an embodiment.

[0024] Figure 3 Bottom view schematic diagram of the construction platform of the present application in an embodiment.

[0025] Figure 4 Schematic structural diagram of the construction platform of the present application in an embodiment from another perspective.

[0026] Figure 5 Explosion schematic diagram of the construction platform of the present application in an embodiment.

[0027] Figure 6 For Figure 1 Cross-sectional schematic diagram of the construction platform in along the VI-VI direction.

[0028] Figure 7 For Figure 2 Schematic structural diagram of the first extension part of the construction platform in in an embodiment.

[0029] Figure 8 Schematic structural diagram of the construction platform of the present application in another embodiment, in which the construction platform is provided with a demolding structure.

[0030] Figure 9 For Figure 8 Connection schematic diagram of the convex part and the through hole of the construction platform in in an embodiment.

[0031] Figure 10 Schematic structural diagram of the 3D printing device of the present application in an embodiment.

[0032] Figure 11 Schematic structural diagram of the 3D printing device of the present application in an embodiment, in which the platform component and the material tray component are in a holding state.

[0033] Figure 12 For Figure 11 Cross-sectional schematic diagram of the 3D printing device in along the IX-IX direction.

[0034] Figure 13 For Figure 12 Partial enlarged schematic diagram of the corresponding area A of the 3D printing device in .

[0035] Description of main component symbols: 200, 3D printing device; 100, building platform; Z, first direction; Y, second direction; X, third direction; P1, step surface; P2, limiting surface; P3, first forming surface; P4, second forming surface; P5, forming surface; P6, first abutting wall; P7, second abutting wall; 1, guiding surface; 2, first side; 3, second side; 10, platform assembly; 11, first platform; 111, first main body part; 1110, through hole; 112, first extension part; 1121, first vertical part; 1122, first horizontal part; 1123, positioning groove; 1124, limiting groove; 1125, first demolding hole; 1126, second demolding hole; 113, limiting part; 114, movable cavity; 12, second platform; 121, second main body part; 1210, convex part; 122, second extension part; 1221, second vertical part; 1222, second horizontal part; 1223, third demolding hole; 1224, fourth demolding hole; 13, demolding structure; 131, rotating handle; 132, first rotating shaft; 133, second rotating shaft; 14, return channel; 20, connection assembly; 21, support frame; 211, installation part; 212, installation convex part; 213, first receiving groove; 214, second receiving groove; 215, support part; 22, movable part; 221, first area part; 2211, abutting groove; 2212, first through hole; 2213, second through hole; 222, second area part; 30, first elastic part; 40, guiding part; 41, abutting part; 50, unlocking assembly; 51, unlocking part; 510, rotating hole; 52, rotating shaft; 60, limiting assembly; 61, second elastic part; 611, connecting part; 612, elastic part; 70, moving assembly; 71, driving mechanism; 72, moving part; 80, material tray assembly; 81, material frame; 810, material groove; 82, optical module; 83, release film; 84, forming cavity; 91, base; 910, installation groove; 92, frame; 920, limiting convex part.

[0036] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0037] The following description will refer to the drawings to more comprehensively describe the content of the present application. The exemplary embodiments shown in the drawings are of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0038] The terms used in this document are for the purpose of describing specific exemplary embodiments only and are not intended to limit this application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are also intended to include the plural forms. Further, when used herein, "comprising" and / or "including" and / or "having", integers, steps, operations, components, and / or assemblies, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Further, unless clearly defined herein, terms such as those defined in a general dictionary 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 idealized or overly formal meanings.

[0040] The following further describes in detail the specific embodiments of this application with reference to the accompanying drawings.

[0041] As Figures 1 to 3 shown, and referring to Figure 8 , this embodiment provides a building platform 100, which is applied to a 3D printing device 200. The 3D printing device 200 is applied to the field of stereolithography 3D printing and includes a moving component 70. The building platform 100 includes a platform component 10 and a connecting component 20. The platform component 10 is connected to the moving component 70 through the connecting component 20 to realize the movement of the platform component 10 through the moving component 70.

[0042] For the convenience of subsequent reading, this application introduces the first direction Z, the second direction Y, and the third direction X to describe the embodiments of this application. The first direction Z, the second direction Y, and the third direction X can be three non-parallel straight-line directions in space; further, the first direction Z, the second direction Y, and the third direction X can be three mutually perpendicular directions in a three-dimensional coordinate system (three-dimensional Cartesian coordinate system). In subsequent embodiments, the first direction Z is taken as the Z-axis direction of the coordinate axis of the three-dimensional coordinate system, the second direction Y is taken as the Y-axis direction of the coordinate axis of the three-dimensional coordinate system, and the third direction X is taken as the X-axis direction of the coordinate axis of the three-dimensional coordinate system as an example for description.

[0043] The platform component 10 is configured to allow a liquid resin to be irradiated by an energy source and deposited to form a cured layer. The platform component 10 includes a first platform 11 and a second platform 12. The surfaces on one side of the first platform 11 and the surfaces on one side of the second platform 12 together form a forming surface P5 of the platform component 10. The consumable can be cured on the forming surface P5 to form a cured layer. Along the first direction Z, the first platform 11 and the second platform 12 can move relative to each other to cause the cured layer formed on the forming surface P5 of the platform component 10 to fall off.

[0044] One end of the connecting component 20 is connected to a moving component 70, and the other end of the connecting component 20 is movably connected to the first platform 11 and the second platform 12 to drive the first platform 11 and the second platform 12 to move along the first direction Z.

[0045] Thus, for the building platform 100 of the present application, the platform component 10 is set as a composite structure composed of the first platform 11 and the second platform 12, and the cured layer formed on the platform component 10 is detached from the platform component 10 by the relative movement between the first platform 11 and the second platform 12, improving the extraction efficiency of the cured layer and avoiding damage to the cured layer caused by using tools such as scrapers. In addition, in the present application, the first platform 11 and the second platform 12 are directly connected by the connecting component 20 and then driven to move synchronously, without setting other connecting structures between the first platform 11 and the second platform 12 to connect the two, simplifying the structure of the building platform 100.

[0046] Please refer to Figures 1 to 3 , in an embodiment, one of the first platform 11 and the second platform 12 is provided with a convex portion 1210, and the other of the first platform 11 and the second platform 12 is provided with a through hole 1110. Along the first direction Z, the convex portion 1210 is movably inserted through the through hole 1110.

[0047] In this embodiment, along the first direction Z, the top end surface of the first platform 11 is provided with a movable cavity 114, and the second platform 12 is movably disposed in the movable cavity 114 so that the second platform 12 can move relative to the first platform 11 along the first direction Z. Among them, along the first direction Z, the through hole 1110 is provided at the bottom end surface of the first platform 11, and the convex portion 1210 is provided at the end surface of the second platform 12 close to the bottom wall of the movable cavity 114.

[0048] The bottom end surface of the first platform 11 is set as the first forming surface P3, and the end surface of the convex portion 1210 away from the second platform 12 is set as the second forming surface P4.

[0049] When the movable member 22 presses the first platform 11 and the second platform 12 against the support frame 21, the first forming surface P3 is flush with the second forming surface P4 to jointly form the forming surface P5 of the platform component 10, that is, the consumables can be stacked on the first forming surface P3 and the second forming surface P4 at the same time. Thus, when the second platform 12 moves upward or downward relative to the first platform 11 along the first direction Z, the first forming surface P3 and the second forming surface P4 are no longer coplanar, and the cured layer will be held by the first forming surface P3 or the second forming surface P4 against it, causing the cured layer to detach from the forming surface P5.

[0050] It can be understood that in other embodiments, the convex portion 1210 may also be provided on the first platform 11. Correspondingly, the through hole 1110 is provided on the second platform 12. The specific positions of the convex portion 1210 and the through hole 1110 can be selected according to actual design requirements.

[0051] It can be understood that in other embodiments, the first platform 11 can be set to move relative to the second platform 12 along the first direction Z.

[0052] In this embodiment, the shape of the through hole 1110 is elongated, and the shape of the convex portion 1210 is adapted to the shape of the through hole 1110. The number of the through holes 1110 is set to be multiple, and the multiple through holes 1110 are distributed in an array. The number of the convex portions 1210 is the same as the number of the through holes 1110, and the multiple convex portions 1210 and the multiple through holes 1110 are arranged in one-to-one correspondence.

[0053] In particular, a reflux channel 14 is provided between the outer peripheral surface of the convex portion 1210 and the inner peripheral surface of the through hole 1110. The existence of the reflux channel 14 enables consumables such as resin to flow back through the reflux channel 14 during the lifting process of the platform assembly 10, making the filling speed of the resin faster, thereby improving the printing speed. In addition, the setting of the reflux channel 14 can also prevent the formation of negative pressure in the inner cavity formed in the middle area of the cured layer when printing a hollow cylinder or the like, and prevent the excessive adsorption force between the platform assembly 10 and the release film 83 of the tray assembly 80 due to the negative pressure during demolding, which may cause deformation of the release film 83 and easily cause problems such as resin splashing.

[0054] It can be understood that in other embodiments, the shapes of the through hole 1110 and the convex portion 1210 can also be other shapes such as circular, and their specific shapes can be selected according to actual design requirements. In addition, the number and distribution of the through hole 1110 and the convex portion 1210 can also be selected according to actual design requirements.

[0055] In this embodiment, along the second direction Y, at least one side of the convex portion 1210 is provided with a guiding surface 1. Along the first direction Z, the guiding surface 1 extends obliquely from the end far away from the material tank 810 towards the side far away from the convex portion 1210 to the end close to the material tank 810, and is used to guide the liquid resin to flow back into the material tank 810.

[0056] Specifically, the convex portion 1210 includes a first component and a second component. Along the second direction Y, the length of the first component is less than that of the second component, and the second component is integrally formed at the bottom end of the first component. The cross-sectional shape of the second component is trapezoidal, and along the second direction Y, guide surfaces 1 are provided on both sides of the second component to guide the liquid resin between the first component and the hole wall of the through hole 1110 to flow downward out of the through hole 1110 quickly under its own gravity through the gap between the second component and the hole wall of the through hole 1110. The guide surface 1 is an inclined plane or an inclined curved surface.

[0057] It can be understood that in other embodiments, along the third direction X, guide surfaces 1 are provided on at least one side of the convex portion 1210. Along the first direction Z, the guide surface 1 extends obliquely from its end away from the material tank 810 towards the side away from the convex portion 1210 to its end close to the material tank 810, for guiding the liquid resin to flow back into the material tank 810.

[0058] It can be understood that in other embodiments, along the second direction Y, guide surfaces 1 are provided on the hole wall of at least one side of the through hole 1110. Along the first direction Z, the guide surface 1 extends obliquely from its end away from the material tank 810 towards the side close to the convex portion 1210 to its end close to the material tank 810, for guiding the liquid resin to flow back into the material tank 810.

[0059] It can be understood that in other embodiments, along the third direction X, guide surfaces 1 are provided on the hole wall of at least one side of the through hole 1110. Along the first direction Z, the guide surface 1 extends obliquely from its end away from the material tank 810 towards the side close to the convex portion 1210 to its end close to the material tank 810, for guiding the liquid resin to flow back into the material tank 810.

[0060] It should be noted that the specific setting position of the guide surface 1 and the shape of the guide surface can be selected according to actual design requirements.

[0061] Please also combine with Figures 4 to 6 and refer to Figure 8 In an embodiment, the connecting component 20 includes a support frame 21 and a movable member 22.

[0062] The extending direction of the support frame 21 is parallel to the second direction Y. One end of the support frame 21 is connected to the moving assembly 70, and the moving assembly 70 drives the support frame 21 to move up and down along the first direction Z. Along the first direction Z, the movable member 22 is movably connected to the support frame 21 so that the movable member 22 can move relative to the support frame 21 along the first direction Z. Among them, both the first platform 11 and the second platform 12 are at least partially clamped between the other end of the support frame 21 away from the moving assembly 70 and the movable member 22. Thus, along the first direction Z, when the movable member 22 moves towards the support frame 21, the movable member 22 presses the first platform 11 and the second platform 12 against the support frame 21, and the first platform 11 and the second platform 12 are relatively fixed to the support frame 21. Along the first direction Z, when the movable member 22 moves towards the side away from the support frame 21, the movable member 22 moves away from the first platform 11 and the second platform 12 and no longer presses the first platform 11 and the second platform 12 against the support frame 21, and the first platform 11 and the second platform 12 can be removed from the support frame 21.

[0063] In this embodiment, the shape of the support frame 21 is generally square-shaped, and a weight-reducing groove is provided at the center of the support frame 21. Along the first direction Z, the weight-reducing groove penetrates the support frame 21 to reduce the weight of the support frame 21. Along the first direction Z, a first receiving groove 213 is provided on the top end surface of the support frame 21. Along the third direction X, the first receiving groove 213 penetrates the support frame 21.

[0064] The shape of the movable member 22 is generally "I"-shaped and includes a first section 221 and two second sections 222. The extending direction of the first section 221 is parallel to the third direction X, and the two second sections 222 are respectively connected to both ends of the first section 221. The extending directions of the two second sections 222 are both parallel to the second direction Y, and the two second sections 222 and the first section 221 are integrally formed.

[0065] The first section 221 is received in the first receiving groove 213. Along the second direction Y, the opposite sides of the first section 221 respectively abut against the inner walls of both sides of the first receiving groove 213 to realize the limit of the movable member 22 in the second direction Y. Both of the two second sections 222 are located outside the first receiving groove 213, and along the third direction X, the two second sections 222 respectively abut against the opposite sides of the support frame 21 to realize the limit of the movable member 22 in the third direction X.

[0066] Thus, when the movable member 22 presses the first platform 11 and the second platform 12 against the support frame 21, the movable member 22 is limited in the second direction Y and the third direction X, avoiding the shaking of the movable member 22 resulting in the first platform 11 and the second platform 12 not being pressed tightly.

[0067] Please also combine with Figures 4 to 6, in one embodiment, the building platform 100 further includes a first elastic member 30. One end of the first elastic member 30 is elastically connected to the movable member 22. The first elastic member 30 is configured to provide an elastic force for the movable member 22 to move toward one side of the support frame 21, so that the movable member 22 presses the first platform 11 and the second platform 12 against the support frame 21 under the action of the elastic force of the first elastic member 30, avoiding shaking of the first platform 11 and the second platform 12.

[0068] Furthermore, the building platform 100 further includes a guiding member 40. The extending direction of the guiding member 40 is parallel to the first direction Z. One end of the guiding member 40 is connected to the support frame 21, and the other end of the guiding member 40 passes through the movable member 22. The first elastic member 30 is a compression spring. One end of the first elastic member 30 is elastically connected to the guiding member 40, and the other end thereof is elastically connected to the movable member 22.

[0069] Specifically, a second receiving groove 214 is provided on the bottom wall of the first receiving groove 213. The second receiving groove 214 extends along the first direction Z and does not penetrate the support frame 21. The bottom end of the guiding member 40 is fixed to the bottom wall of the second receiving groove 214. A first through hole 2212 is provided on the first region portion 221. The first through hole 2212 extends along the first direction Z and penetrates the first region portion 221. The top end of the guiding member 40 passes through the first through hole 2212, and a resisting portion 41 is provided at the end of the guiding member 40 passing through the first through hole 2212. The outer diameter of the resisting portion 41 is larger than the outer diameter of the guiding member 40.

[0070] The cross-sectional shape of the first through hole 2212 is trapezoidal to form a stepped surface P1 between two sections with different inner diameters of the first through hole 2212. The first elastic member 30 is sleeved on the outer peripheral surface of the guiding member 40 and is elastically compressed between the stepped surface P1 and the resisting portion 41.

[0071] In this embodiment, the number of guiding members 40 is set to two. The two guiding members 40 are spaced along the third direction X. Correspondingly, the number of the first elastic members 30 is set to two.

[0072] It can be understood that in other embodiments, the number of the guiding members 40 and the first elastic members 30 can also be set to one or three or other numbers.

[0073] Please also refer to Figures 4 to 6 , in one embodiment, the building platform 100 further includes an unlocking assembly 50. The unlocking assembly 50 is movably connected to the support frame 21. The unlocking assembly 50 is configured to resist the movable member 22 to move toward the side away from the support frame 21, so as to drive the movable member 22 to move toward the side away from the support frame 21 by overcoming the elastic force exerted on it by the first elastic member 30 through the unlocking assembly 50, so that the movable member 22 no longer presses the first platform 11 and the second platform 12 against the support frame 21.

[0074] Specifically, the unlocking component 50 includes an unlocking member 51 and a rotating shaft 52.

[0075] The rotating shaft 52 is cylindrical in shape, and the extending direction of the rotating shaft 52 is parallel to the third direction X. The rotating shaft 52 is connected to the support frame 21. The support frame 21 is provided with a mounting portion 211, the extending direction of the mounting portion 211 is parallel to the third direction X, and both ends of the mounting portion 211 are respectively connected to the inner walls on both sides of the weight-reducing groove. Along the first direction Z, the height of the top surface of the mounting portion 211 is lower than the height of the bottom wall of the first receiving groove 213.

[0076] Two mounting protrusions 212 protrude from the top surface of the mounting portion 211. Along the third direction X, the two mounting protrusions 212 are spaced apart. The rotating shaft 52 is located between the two mounting protrusions 212, and both ends of the rotating shaft 52 are respectively connected to the two mounting protrusions 212.

[0077] The unlocking member 51 is strip-shaped, and the extending direction of the unlocking member 51 is parallel to the second direction Y. The unlocking member 51 is provided with a rotating hole 510. Along the third direction X, the rotating hole 510 penetrates through the unlocking member 51. The rotating shaft 52 passes through the rotating hole 510 so that the unlocking member 51 can rotate around the axis of the rotating shaft 52. One end of the unlocking member 51 abuts against the movable member 22 in a movable manner, and the other end of the unlocking member 51 is a free end. By applying an external force to the free end of the unlocking member 51, the unlocking member 51 can be driven to rotate around the rotating shaft 52, and further the unlocking member 51 abuts against the movable member 22 and moves the movable member 22 away from the support frame 21.

[0078] Particularly, the rotating hole 510 is generally located at the end of the unlocking member 51 close to the movable member 22, which can play a role in saving effort.

[0079] Along the second direction Y, a resisting groove 2211 is provided on the side of the first region portion 221 close to the unlocking member 51. Along the first direction Z, the depth of the resisting groove 2211 is greater than the thickness of the unlocking member 51, so that the free end of the unlocking member 51 can move up and down in the resisting groove 2211. After the free end of the unlocking member 51 contacts the top wall of the resisting groove 2211, the movable member 22 is pushed to move upward.

[0080] Please also combine with Figures 2 to 6 , in an embodiment, the first platform 11 includes a first main body portion 111 and a first extending portion 112. The first extending portion 112 is connected to the first main body portion 111, and at least part of the first extending portion 112 is clamped between the support frame 21 and the movable member 22.

[0081] The shape of the first main body portion 111 is generally flat, and the through hole 1110 is provided on the bottom end surface of the first main body portion 111 and penetrates the first main body portion 111. The shape of the first extension portion 112 is generally "L"-shaped and includes a first vertical portion 1121 and a first horizontal portion 1122. The extending direction of the first vertical portion 1121 is parallel to the first direction Z. The bottom end of the first vertical portion 1121 is connected to the top end surface of the first main body portion 111. The extending direction of the first horizontal portion 1122 is parallel to the third direction X, and one end of the first horizontal portion 1122 is connected to the top end of the first vertical portion 1121, and the other end of the first horizontal portion 1122 is clamped between the support frame 21 and the movable member 22.

[0082] Specifically, along the third direction X, the opposite sides of the support frame 21 are convexly provided with support portions 215. Along the first direction Z, the thickness of the support portion 215 is smaller than the thickness of the support frame 21. One end of the first horizontal portion 1122 away from the first vertical portion 1121 is placed on the top end surface of the support portion 215, and the support portion 215 plays a supporting role for the first horizontal portion 1122.

[0083] The number of the first extension portions 112 is set to two. Along the third direction X, the two first extension portions 112 are arranged at intervals, and the above-mentioned movable cavity 114 is formed between the two first extension portions 112. The support frame 21 is at least partially arranged between the two first extension portions 112, and the two first horizontal portions 1122 of the two first extension portions 112 are respectively placed on the top end surfaces of the two support portions 215.

[0084] In this way, the number of the first extension portions 112 and the support portions 215 is both set to two, which can simultaneously press the first platform 11 from the left and right sides along the third direction X, making the force on the first platform 11 more uniform, and avoiding the risk of tilting due to uneven left and right forces, thereby realizing automatic leveling and avoiding errors that are likely to occur during manual leveling.

[0085] In addition, when the two first horizontal portions 1122 of the two first extension portions 112 are respectively placed on the top end surfaces of the two support portions 215, the two first horizontal portions 1122 respectively abut against the opposite sides of the support frame 21 along the third direction X to realize the limit of the first platform 11 in the third direction X.

[0086] Please also combine Figure 7 and refer to Figures 4 to 5 In an embodiment, the building platform 100 further includes a limiting component 60. The limiting component 60 is arranged on the support frame 21 or the movable member 22, and the limiting component 60 movably abuts against the first platform 11 to at least limit the first platform 11 in the second direction Y.

[0087] The limiting component 60 includes a second elastic member 61. The first end of the second elastic member 61 is elastically connected to the movable member 22. A limiting groove 1124 is provided on the first platform 11, and the second end of the second elastic member 61 is clamped in the limiting groove 1124.

[0088] Specifically, a second through hole 2213 is provided on the second region portion 222 of the movable member 22. Along the first direction Z, the second through hole 2213 penetrates the second region portion 222. The second elastic member 61 is a spring plunger. Along the first direction Z, the second elastic member 61 includes a connecting portion 611 and an elastic portion 612 that are connected in sequence. The shape of the connecting portion 611 is cylindrical, and the shape of the elastic portion 612 is hemispherical. Moreover, the elastic portion 612 is made of an elastic material such as silica gel. The connecting portion 611 is inserted through the second through hole 2213, and the connecting portion 611 is in threaded cooperation with the second through hole 2213 to threadedly connect the connecting portion 611 to the second region portion 222.

[0089] A limiting groove 1124 is provided on the first horizontal portion 1122 of the first platform 11. The limiting groove 1124 is located on the top surface of the region where the first horizontal portion 1122 coincides with the support portion 215. The top end of the elastic portion 612 is connected to the connecting portion 611. After the bottom end of the elastic portion 612 extends out of the second through hole 2213, it is clamped in the limiting groove 1124.

[0090] During the process that the movable member 22 moves away from the support frame 21 to no longer abut against the first platform 11 under the action of the unlocking component 50, the elastic portion 612 of the second elastic member 61 is always clamped in the limiting groove 1124. So when the first platform 11 is no longer clamped, the existence of the second elastic member 61 enables there to still be a certain connection relationship between the first platform 11 and the movable member 22, preventing the first platform 11 from immediately slipping and falling after the movable member 22 is lifted.

[0091] The shape of the limiting groove 1124 is generally "V"-shaped. Along the second direction Y, the opposite inner walls of the limiting groove 1124 are provided with a first abutting wall P6 and a second abutting wall P7. Both the first abutting wall P6 and the second abutting wall P7 are configured to abut against the second elastic member 61. Both the first abutting wall P6 and the second abutting wall P7 are inclined, and the first abutting wall P6 and the second abutting wall P7 are arranged at an angle to facilitate guiding the elastic portion 612 into or out of the limiting groove 1124.

[0092] In this way, through the abutting action of the first abutting wall P6 and the second abutting wall P7 on the elastic part 612, the limit of the first platform 11 in the second direction Y is realized. When it is necessary to remove the first platform 11, the first platform 11 can be directly pushed along the second direction Y, so that the elastic part 612 overcomes the limiting action of the limiting groove 1124 on it and the elastic part 612 leaves the limiting groove 1124, so that the first platform 11 can be smoothly pushed away from the supporting part 215 along the second direction Y. At the same time, the second platform 12 is located in the moving cavity 114 of the first platform 11. After the first platform 11 is removed, the second platform 12 is also removed from the connecting component 20 synchronously. In addition, the setting of the limiting component 60 can provide position feedback to enhance the human-computer interaction function. The user can first fix the position of the platform component 10 through the limiting component 60, and cooperate with the clamping action of the supporting frame 21 and the moving part 22 to level the position of the platform component 10, and printing can be carried out without additional leveling operation.

[0093] Please also combine Figures 4 to 5 with Figure 2 In an embodiment, the second platform 12 includes a second main body portion 121 and a second extension portion 122. The shape of the second main body portion 121 is generally flat, and the second main body portion 121 is placed horizontally. The second extension portion 122 is connected to the top end surface of the second main body portion 121, and at least a part of the second extension portion 122 is clamped between the support frame 21 and the moving part 22.

[0094] Specifically, the shape of the second extension portion 122 is generally "T" shaped, and includes a second vertical portion 1221 and a second horizontal portion 1222. The extending direction of the second vertical portion 1221 is parallel to the first direction Z. The bottom end of the second vertical portion 1221 is connected to the top end surface of the second main body portion 121. The extending direction of the second horizontal portion 1222 is parallel to the third direction X, and the bottom end surface of the middle region of the second horizontal portion 1222 is connected to the top end surface of the second vertical portion 1221. One end of the second horizontal portion 1222 is placed on the top end surface of the support portion 215 to support the second horizontal portion 1222 through the support portion 215.

[0095] Wherein, the number of the second extension portions 122 is two. Along the third direction X, the two second extension portions 122 are arranged at intervals. Along the third direction X, the two second extension portions 122 are respectively arranged on the opposite sides of the support frame 21, and the similar ends of the second horizontal portions 1222 of the two second extension portions 122 are both placed on the top end surface of the support portion 215. In addition, the similar ends of the second horizontal portions 1222 of the two second extension portions 122 respectively abut against the opposite sides of the support frame 21 along the third direction X to realize the limit of the second platform 12 in the third direction X.

[0096] A positioning groove 1123 is formed on the top surface of the first extension portion 112. Along the third direction X, one end of the second horizontal portion 1222 away from the support frame 21 extends into the positioning groove 1123 and abuts against the side wall of the positioning groove 1123 to further limit the second platform 12 in the third direction X.

[0097] In addition, along the second direction Y, the opposite sides of the second horizontal portion 1222 extending into the area of ​​the positioning groove 1123 respectively abut against the side walls of the positioning groove 1123 along the second direction Y, so as to limit the second platform 12 in the second direction Y. In this way, when the movable member 22 no longer presses the second platform 12 against the support frame 21, the second platform 12 is supported by the support portion 215, and the second platform 12 is limited in both the second direction Y and the third direction X, ensuring that the second platform 12 will not slide directly after the movable member 22 releases the clamping state. In addition, this limiting method of the second platform 12 does not affect the disassembly and assembly of the second platform 12. When the first platform 11 is removed, the second platform 12 can still be removed from the connecting assembly 20 synchronously with the first platform 11.

[0098] In particular, along the first direction Z, the positioning groove 1123 penetrates the top end surface of the first extension portion 112 , so that the second platform 12 can move upward along the first direction Z and then leave the first platform 11 .

[0099] Please combine again Figure 8 In another embodiment, the building platform 100 further includes a demolding structure 13, which is transmission-connected to one of the first platform 11 and the second platform 12, and along the first direction Z, the demolding structure 13 is configured to drive one of the first platform 11 and the second platform 12 to move relative to the other.

[0100] Along the third direction X, the demoulding structure 13 is at least disposed on one side of the first platform 11, and the demoulding structure 13 is rotatably connected to the first platform 11, and the second platform 12 is at least partially located on the rotation path of the demoulding structure 13. Based on the rotation of the demoulding structure 13 relative to the first platform 11, the demoulding structure 13 can drive the second platform 12 to move relative to the first platform 11 along the first direction Z.

[0101] In this embodiment, the number of the demoulding structures 13 is set to two. Along the third direction X, the two demoulding structures 13 are respectively arranged on opposite sides of the first platform 11, and the two demoulding structures 13 are both rotatably connected to the first platform 11.

[0102] The demolding structure 13 includes a rotating handle 131, a first rotating shaft 132, and a second rotating shaft 133. The extending directions of the first rotating shaft 132 and the second rotating shaft 133 are both parallel to the third direction X. Along the second direction Y, the first rotating shaft 132 and the second rotating shaft 133 are arranged at intervals. Along the third direction X, the rotating handle 131 is located on the side of the first vertical portion 1121 away from the second vertical portion 1221.

[0103] Wherein, a first demolding hole 1125 and a second demolding hole 1126 are formed in the first vertical portion 1121. Along the third direction X, the first demolding hole 1125 and the second demolding hole 1126 penetrate through the first vertical portion 1121. A third demolding hole 1223 and a fourth demolding hole 1224 are formed in the second vertical portion 1221. Along the third direction X, the third demolding hole 1223 and the fourth demolding hole 1224 penetrate through the second vertical portion 1221. Along the second direction Y, the first demolding hole 1125 and the second demolding hole 1126 are arranged at intervals, and the third demolding hole 1223 and the fourth demolding hole 1224 are arranged at intervals.

[0104] The shape of the first demolding hole 1125 is circular, the shape of the second demolding hole 1126 is elongated, and the second demolding hole 1126 extends along the first direction Z. The shape of the third demolding hole 1223 is elongated, and the third demolding hole 1223 extends along the first direction Z. The shape of the fourth demolding hole 1224 is circular.

[0105] One end of the first rotating shaft 132 sequentially passes through the third demolding hole 1223 and the first demolding hole 1125 and then is connected to the rotating handle 131. One end of the second rotating shaft 133 sequentially passes through the fourth demolding hole 1224 and the second demolding hole 1126 and then is connected to the rotating handle 131. In addition, the other ends of the first rotating shaft 132 and the second rotating shaft 133 both abut against the second vertical portion 1221.

[0106] In this way, the second demolding hole 1126 and the third demolding hole 1223 are set to be elongated, which can provide the moving space for the first rotating shaft 132 and the second rotating shaft 133 in the first direction Z. Thus, by rotating the rotating handle 131, the second platform 12 can be raised or lowered relative to the first platform 11 in the first direction Z, so that the cured layer can be quickly demolded.

[0107] In this embodiment, along the second direction Y, the platform assembly 10 defines a first side 2 and a second side 3 which are arranged oppositely. The corresponding first demolding hole 1125 of one demolding structure 13 is located on the side of the second demolding hole 1126 close to the first side 2, and its corresponding third demolding hole 1223 is located on the side of the fourth demolding hole 1224 close to the first side 2.

[0108] The first demolding hole 1125 corresponding to another demolding structure 13 is located on a side of the second demolding hole 1126 away from the first side 2 , and the third demolding hole 1223 corresponding to the other demolding structure 13 is located on a side of the fourth demolding hole 1224 away from the first side 2 .

[0109] In this way, the first demolding holes 1125 and the second demolding holes 1126 of the two demolding structures 13 are arranged in opposite directions, and the third demolding holes 1223 and the fourth demolding holes 1224 are arranged in opposite directions, so as to ensure that the two second platforms 12 can move synchronously.

[0110] like Figures 9 to 13 See Figure 5 The embodiment of the present application further provides a 3D printing device 200, comprising a moving component 70, a material tray component 80, and the above-mentioned building platform 100. The moving component 70 is connected to the connecting component 20 of the building platform 100 to drive the platform component 10 of the building platform 100 to approach or move away from the material tray component 80 along the first direction Z.

[0111] In this embodiment, the moving assembly 70 includes a driving mechanism 71 and a moving member 72. The driving mechanism 71 is a screw linear slide and is arranged along the first direction Z. It has a power-off self-locking function. The moving member 72 is connected to the driving mechanism 71 by transmission, so that the driving mechanism 71 drives the moving member 72 to rise and fall along the first direction Z.

[0112] There are two moving assemblies 70 , which are spaced apart along the third direction X. The moving members 72 of the two moving assemblies 70 are both connected to the support frame 21 , so that the two moving assemblies 70 synchronously drive the support frame 21 to move along the first direction Z.

[0113] The support frame 21 and the moving member 72 can be connected by fasteners such as screws to achieve a detachable design of the support frame 21.

[0114] In this embodiment, the 3D printing device 200 further includes a base 91 and a frame 92. The base 91 is arranged horizontally, the frame 92 is arranged along the first direction Z, and the bottom end of the frame 92 is connected to the base 91. The frame 92 and the base 91 can be arranged in an integral manner or can be detachably connected. Both moving assemblies 70 are installed on one side of the frame 92 along the second direction Y.

[0115] One side of the frame 92 facing the moving assembly 70 is convexly provided with a limiting convex portion 920, and the limiting convex portion 920 is located on the lifting path of the end of the unlocking member 51 away from the rotating shaft 52. When the moving assembly 70 drives the support frame 21 to move upward, the support frame 21 drives the unlocking member 51 to move upward. When the unlocking member 51 abuts against the limiting convex portion 920, the moving assembly 70 continues to drive the support frame 21 to move upward. The end of the unlocking member 51 away from the rotating shaft 52 is abutted by the limiting convex portion 920 and rotates downward, so that the end of the unlocking member 51 close to the rotating shaft 52 rotates upward, and then the movable member 22 is jacked up by the unlocking member 51, so that the movable member 22 no longer presses the platform assembly 10 against the support frame 21. In this way, the setting of the limiting convex portion 920 can be used as the zero position of the 3D printing device 200, so as to realize the automatic unlocking of the movable member 22 through the limiting convex portion 920.

[0116] The top end surface of the base 91 is provided with an installation groove 910, and the material tray assembly 80 is placed in the installation groove 910. Limiting members 113 are respectively provided on the opposite sides of the two first extension portions 112 of the first platform 11. A limiting surface P2 is provided at one end of the limiting member 113 facing the material tray assembly 80.

[0117] The material tray assembly 80 includes a material frame 81, an optical module 82, and a release film 83. The material frame 81 is placed in the installation groove 910. A material groove 810 is formed on the top end surface of the material frame 81. The optical module 82 and the release film 83 are placed in the material groove 810, and the release film 83 is located at the uppermost position. The optical module 82 can irradiate photocurable materials such as resin to obtain each cured layer with the required pattern, and the printed part is formed after the stacking of each cured layer.

[0118] The first distance between the limiting surface P2 and the end surface of the material frame 81 facing the platform assembly 10 is smaller than the second distance between the forming surface P5 and the top end surface of the release film 83, so that there is a forming cavity 84 between the forming surface P5 and the release film 83 when the limiting surface P2 abuts against the end surface of the material frame 81 facing the platform assembly 10.

[0119] Particularly, the number of the limiting members 113 is set to four. Among them, two limiting members 113 are provided on one first extension portion 112, and the other two limiting members 113 are provided on the other first extension portion 112. In addition, the two limiting members 113 located on the same first extension portion 112 are spaced apart along the second direction Y, so as to realize the limitation between the platform assembly 10 and the material tray assembly 80 through the four limiting members 113.

[0120] Optionally, the difference between the first spacing and the second spacing is 0.3 mm, that is, the height of the forming cavity 84 is 0.3 mm. On the one hand, it ensures that when the platform assembly 10 descends, the limiting member 113 first contacts the upper edge of the material frame 81, preventing the platform assembly 10 from hitting the screen and other structures of the optical module 82 and causing damage to it. On the other hand, the limiting members 113 of the platform assembly 10 are all pressed tightly on the material frame 81, so that the position between the forming surface P5 and the top surface of the release film 83 is forcibly restricted, leaving only the space with the minimum thickness to ensure the successful adhesion probability of the cured layer after forming and reduce problems such as printing failure caused by leveling reasons.

[0121] It can be understood that in addition to the above structures, the 3D printing device 200 further includes other supporting structures for photocuring printing.

[0122] In the foregoing, specific embodiments of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. A construction platform, characterized in that: include: A platform assembly is configured to provide a liquid resin with an energy source to form a solidified layer, the platform assembly includes a first platform and a second platform, the first platform and the second platform are configured to be relatively movable along a first direction, and are used to cause the solidified layer formed on the platform assembly to fall off; A connecting component has one end connected to a moving component, and the other end of the connecting component is movably connected to the first platform and the second platform, so as to drive the first platform and the second platform to move along the first direction.

2. The construction platform according to claim 1, characterized in that: One of the first platform and the second platform is provided with a protrusion, and the protrusion is configured to allow part of the liquid resin to be formed into the solidified layer thereon, and the other of the first platform and the second platform is provided with a through hole, and the protrusion can be movably penetrated through the through hole along the first direction.

3. The construction platform according to claim 2, characterized in that: A reflux channel is formed between at least a portion of the convex portion and an inner peripheral surface of the through hole, and the reflux channel is configured to allow the liquid resin flowing into the through hole to flow back into a material tank, and the material tank is configured to store the liquid resin.

4. The construction platform according to claim 3, characterized in that: The outer circumferential surface of the protrusion is spaced apart from the inner circumferential surface of the through hole to form the reflux channel between the outer circumferential surface of the protrusion and the inner circumferential surface of the through hole.

5. The construction platform according to claim 3, characterized in that: A guiding surface is provided on at least one side of the convex portion along a second direction, the second direction intersects with the first direction, and along the first direction, the guiding surface obliquely extends from an end thereof away from the material trough toward a side away from the convex portion to an end thereof close to the material trough, for guiding the liquid resin to flow back into the material trough; or, Along a third direction, at least one side of the protrusion is provided with a guide surface, and the third direction intersects with the first direction. Along the first direction, the guide surface extends obliquely from an end away from the material trough toward a side away from the protrusion to an end of the guide surface close to the material trough, for guiding the liquid resin to flow back into the material trough.

6. The construction platform according to claim 3, characterized in that: A guide surface is provided on at least one side of the hole wall of the through hole along a second direction, the second direction intersects with the first direction, and along the first direction, the guide surface extends obliquely from an end thereof away from the material groove toward a side close to the convex portion to an end of the guide surface close to the material groove, for guiding the liquid resin to flow back into the material groove; or, Along a third direction, a guide surface is provided on the hole wall on at least one side of the through hole, and the third direction intersects with the first direction. Along the first direction, the guide surface extends obliquely from an end away from the material trough toward a side close to the convex portion to an end of the guide surface close to the material trough, so as to guide the liquid resin to flow back into the material trough.

7. The construction platform according to claim 2, characterized in that: Along the first direction, one end of the first platform is provided with a movable cavity, and the second platform is movably disposed in the movable cavity; The through hole is arranged at the other end of the first platform along the first direction and is connected to the active cavity, and the convex portion is arranged at one end of the second platform close to the bottom wall of the active cavity.

8. The construction platform according to claim 1, characterized in that: The building platform further includes a demoulding structure, which is drivingly connected to one of the first platform and the second platform, and is configured to drive one of the first platform and the second platform to move relative to the other along the first direction.

9. The construction platform according to claim 8, characterized in that: Along the third direction, the demoulding structure is at least provided on one side of the first platform, and the demoulding structure is rotatably connected to the first platform, and the second platform is at least partially located on the rotation path of the demoulding structure, and the third direction intersects with the first direction; Wherein, based on the rotation of the demoulding structure relative to the first platform, the demoulding structure can drive the second platform to move relative to the first platform along the first direction.

10. The construction platform according to claim 9, characterized in that: The demoulding structure includes a rotating handle, a first rotating shaft and a second rotating shaft; A first demoulding hole and a second demoulding hole are provided on the first platform, the first demoulding hole and the second demoulding hole are spaced apart along a second direction, the second direction intersects with the first direction, and along the first direction, an extension length of the second demoulding hole is greater than an extension length of the first demoulding hole; A third demoulding hole and a fourth demoulding hole are formed on the second platform. Along the second direction, the third demoulding hole and the fourth demoulding hole are spaced apart from each other. Along the first direction, the extension length of the third demoulding hole is greater than the extension length of the fourth demoulding hole. The first rotating shaft is provided through the third demoulding hole and the first demoulding hole, and the second rotating shaft is provided through the fourth demoulding hole and the second demoulding hole; The rotating handle can rotate relative to the platform assembly, and the rotating handle is connected to the first rotating shaft and the second rotating shaft.

11. The construction platform according to claim 10, characterized in that: The number of the demoulding structures is set to two, and along the third direction, the two demoulding structures are respectively arranged on both sides of the platform component; Along the second direction, the platform assembly is defined with a first side and a second side disposed opposite to each other, the first demolding hole corresponding to one of the demolding structures is located on a side of the second demolding hole close to the first side, and the third demolding hole corresponding to the first demolding structure is located on a side of the fourth demolding hole close to the first side; The first demoulding hole corresponding to another demoulding structure is located on a side of the second demoulding hole away from the first side, and the third demoulding hole corresponding to the other demoulding structure is located on a side of the fourth demoulding hole away from the first side.

12. The construction platform according to claim 1, wherein: The connection component comprises: A support frame, one end of which is connected to the moving assembly; A movable member, movably connected to the support frame along a first direction; Wherein, the first platform and the second platform are at least partially clamped between the other end of the support frame away from the moving component and the movable part.

13. The construction platform according to claim 12, characterized in that: The building platform further comprises an unlocking component, which is movably connected to the support frame and is configured to push the movable member to move toward a side away from the support frame.

14. The construction platform of claim 12, wherein: The first platform includes a first main body and a first extension, the first extension is connected to the first main body, and the first extension is at least partially clamped between the support frame and the movable member; The number of the first extension parts is set to two, and along the third direction, the two first extension parts are arranged at intervals, and an active cavity is formed between the two first extension parts, the third direction intersects with the first direction, and the second platform is movably arranged in the active cavity; The support frame is at least partially disposed between the two first extension portions, and the two first extension portions respectively abut against two opposite sides of the support frame along the third direction.

15. The construction platform according to claim 14, characterized in that: The second platform includes a second main body and a second extension, the second extension is connected to the second main body, and the second extension is at least partially clamped between the support frame and the movable member; A positioning groove is provided on the first extension portion, and along the third direction, one end of the second extension portion abuts against the support frame, and the other end thereof extends into the positioning groove and abuts against the side wall of the positioning groove; Wherein, along the second direction, the two opposite sides of the area where the second extension portion extends into the positioning groove respectively abut against the side walls of the positioning groove, and the second direction intersects with the first direction and the third direction.

16. A 3D printing device, characterized in that: It comprises a moving component, a material tray component, and a building platform as described in any one of claims 1 to 15, wherein the moving component is connected to a connecting component of the building platform to drive the platform component of the building platform to approach or move away from the material tray component along the first direction.

17. The 3D printing device according to claim 16, characterized in that: A limiting member is provided on the side wall of the platform assembly, a limiting surface is provided on one end of the limiting member facing the tray assembly, and a molding surface is provided on one end of the platform assembly facing the tray assembly; A material trough is provided at one end of the material tray assembly facing the platform assembly, and a first distance between the limiting surface and the end surface of the material tray assembly facing the platform assembly is smaller than a second distance between the molding surface and the bottom wall of the material trough.

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