3D printing device

Abstract

The present application provides a 3D printing device (10). The 3D printing device (10) comprises a printing platform (100) and a separation assembly (200); the separation assembly (200) comprises a separation member (210) and a flipping member (220); the separation member (210) is used for separating a workpiece (900) from the printing platform (100); and the flipping member (220) is used for flipping the workpiece (900).

Description

3D printing device

[0001] The present application claims priority to the Chinese patent application No. 202411170084.3, filed on August 23, 2024, entitled "3D printing device with stripping assembly", and the Chinese patent application No. 202423322464.2, filed on December 31, 2024, entitled "3D printing device", both of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of 3D printing, in particular to a 3D printing device. BACKGROUND

[0003] After a workpiece is printed and formed by a 3D printing technology, the workpiece is often attached to a printing platform, and needs to be stripped from the printing platform.

[0004] In the related art, when a workpiece is stripped from a printing platform by using a top rod type automatic stripping device, the workpiece is unevenly stressed and has a low pass rate. When a workpiece is stripped from a printing platform by using a common shovel type automatic stripping device, after a large number of workpieces are printed on the printing platform at a time, the workpieces are separated from the printing platform by a shovel, and the workpieces are easily pressed and extruded layer by layer, and the shovel is easily jammed with the printing platform, which causes damage to the workpieces and the device. SUMMARY

[0005] According to various embodiments of the present application, a 3D printing device is provided, comprising:

[0006] a printing platform; and

[0007] a stripping assembly, comprising a stripping member and a turnover member, the stripping member is used for stripping a workpiece from the printing platform, and the turnover member is used for turning over the workpiece.

[0008] In some embodiments, the 3D printing device comprises a driving device, the driving device is used for driving the stripping assembly and the printing platform to move relatively.

[0009] In some embodiments, the stripping assembly further comprises a mounting member, and the stripping member and the turnover member are detachably mounted on the mounting member.

[0010] In some embodiments, the stripping member comprises a stripping portion which is overall inclined relative to the printing platform.

[0011] In some embodiments, the stripping member further comprises a supporting portion, the supporting portion is capable of driving the stripping portion to rotate, so that the stripping member has two working states of a stripping state and a discharging state.

[0012] In some embodiments, the included angle between the stripping part and the printing platform contact part when the stripping member is in the stripping state is smaller than the corresponding included angle when the stripping member is in the unloading state.

[0013] In some embodiments, the flipping member is vertically arranged, and the cross section of the side facing the workpiece to be stripped is entirely arc-shaped or has an angular joint.

[0014] In some embodiments, the angular joint is an obtuse angle joint.

[0015] In some embodiments, the flipping member includes a vertically arranged mounting plate, the mounting plate is provided with a poking piece, and the poking piece is driven to swing up and down by a motor; or the mounting plate is provided with a poking gear, and the poking gear is driven to rotate by a motor.

[0016] In some embodiments, any one or a combination of the following two is further included:

[0017] The 3D printing device is of the light curing type, and further includes a printing device, which can be an ultraviolet light irradiation device.

[0018] The 3D printing device further includes a resin tank for accommodating photosensitive resin.

[0019] The 3D printing device has a lifting device, and the printing platform is detachably mounted on the lifting device.

[0020] The 3D printing device further includes a material guide plate, and the material guide plate is arranged on the unloading side of the printing platform.

[0021] In some embodiments, the stripping member includes a stripping part and a supporting part connected to the stripping part, and the supporting part has a plurality of contact structures capable of contacting the workpiece and a plurality of non-contact structures recessed relative to the contact structures and not contacting the workpiece.

[0022] In some embodiments, the plurality of contact structures are formed by a plurality of protrusions protruding from the supporting part, and the plurality of non-contact structures are formed by a plurality of grooves formed in the supporting part.

[0023] In some embodiments, the protrusions have a spherical surface capable of point contact with the workpiece.

[0024] In some embodiments, the stripping assembly includes a mounting side plate, the printing platform and the mounting side plate are capable of relative movement along the Z axis and the X axis, and the supporting part and the mounting side plate are rotationally connected about the Y axis.

[0025] In some embodiments, the peeling member rotates relative to the mounting side plate to have a first limit position and a second limit position as the printing platform moves relative to the mounting side plate along the Z axis, an angle θ1 between the peeling member and the X axis at the first limit position is greater than an angle θ2 between the peeling member and the X axis at the second limit position, wherein 5°≤θ2≤15°, θ1≤90°.

[0026] In some embodiments, the turnover member comprises a turnover portion and a connecting portion, the turnover portion has a front surface capable of guiding the workpiece to turn over and a back surface opposite to the front surface, and the connecting portion is connected to the back surface; the connecting portion is connected to the mounting side plate.

[0027] In some embodiments, the peeling assembly comprises a support beam arranged between the connecting portion and the mounting side plate, the connecting portion is fixedly connected to the support beam, and the support beam is movable relative to the mounting side plate along the X axis.

[0028] In some embodiments, the peeling assembly comprises a shielding plate located on one side of the back surface, fixedly connected to the connecting portion, and higher than the turnover portion along the Z axis.

[0029] In some embodiments, the 3D printing device comprises driving devices and lifting devices, the lifting devices are connected to the printing platform to drive the printing platform to move up and down along the Z axis, and the driving devices are connected to the mounting side plates to drive the mounting side plates to move along the X axis.

[0030] In some embodiments, the mounting side plates are two, and the peeling assembly is mounted between the two mounting side plates; the driving devices are two, and the two driving devices are connected to the two mounting side plates one by one.

[0031] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or in the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only embodiments of the application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort based on the disclosed accompanying drawings.

[0033] FIG. 1 is a structural schematic view of a 3D printing device with a peeling assembly according to some embodiments;

[0034] Figure 2 is a schematic view of a peeling assembly of an embodiment of the 3D printing device shown in Figure 1, and the peeling assembly is in a peeling state;

[0035] Figure 3 is a schematic view of the peeling assembly shown in Figure 2 in a feeding state;

[0036] Figure 4 is a front view of the peeling assembly shown in Figure 2;

[0037] Figure 5 is a schematic view of a peeling assembly of another embodiment;

[0038] Figure 6 is a schematic view of a turnover member of the peeling assembly shown in Figure 5;

[0039] Figure 7 is a schematic view of a peeling assembly of yet another embodiment employing a pusher;

[0040] Figure 8 is a schematic view of the peeling assembly shown in Figure 7 employing a pusher gear;

[0041] Figure 9 is a schematic view of a peeling assembly of yet another embodiment of the 3D printing device shown in Figure 1;

[0042] Figure 10 is an enlarged view of the structure at A in Figure 9;

[0043] Figure 11 is a schematic view of a peeling member of another embodiment of the peeling assembly shown in Figure 9;

[0044] Figure 12 is a sectional view along D-D of the peeling member shown in Figure 11;

[0045] Figure 13 is a schematic view of the peeling member of the peeling assembly shown in Figure 9 in a first extreme position;

[0046] Figure 14 is a schematic view of the peeling member of the peeling assembly shown in Figure 9 in a second extreme position;

[0047] Figure 15 is a sectional view of the peeling assembly shown in Figure 9;

[0048] Figure 16 is a schematic view of the peeling assembly shown in Figure 9 from another perspective;

[0049] Figure 17 is an enlarged view of the structure at B in Figure 16;

[0050] Figure 18 is a schematic view of a workpiece printed by the 3D printing device of the present application;

[0051] In the drawings, reference numerals:

[0052] 10, 3D printing device; 11, frame; 11a, base; 11b, mounting frame; 900, workpiece; 100, printing platform; 12, printing device; 13, driving device; 14, lifting device; 15, material guide plate; 200, stripping assembly; 210, stripping piece; 220, turnover piece; 221, turnover part; 22a, front surface; 22b, back surface; 222, connecting part; 223, turnover plate; 224, mounting plate; 225, push piece; 226, material pushing gear; 270, mounting piece; 211, stripping part; 212, supporting part; 213, first groove; 214, protrusion; 215, second groove; 21a, contact structure; 21b, non-contact structure; 230, mounting side plate; 231, first abutting surface; 232, second abutting surface; 233, waist-shaped hole; 240, reinforcing plate; 241, limiting protrusion; 242, rotating shaft; 250, supporting beam; 260, shielding plate. Embodiments of the present application

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] FIG. 18 is a workpiece 900 printed by the 3D printing device in the present application, specifically a dental brace.

[0055] Please refer to FIGS. 1 to 17, the 3D printing device provided in the embodiments of the present application will be described.

[0056] Referring to FIG. 1, the 3D printing device 10 includes a control system (not shown in the figure), a frame 11, a resin tank (not shown in the figure), a printing platform 100, a stripping assembly 200, a printing device 12, and a driving device 13. The frame 11 includes a base 11a and a mounting frame 11b arranged above the base 11a. The resin tank is arranged on the upper surface of the base 11a and is used to hold a resin solution as a printing substrate. The printing device 12 is arranged on the top of the mounting frame 11b and is used to perform ultraviolet light irradiation and curing forming. The stripping assembly 200 separates the completed workpiece 900 from the printing platform 100 and unloads the workpiece 900. The control system controls the automatic completion of the above-mentioned operations. The 3D printing device 10 further includes an automatic liquid supplementing device (not shown in the figure) for automatically supplementing the photosensitive resin to the resin tank.

[0057] 3D printing device 10 has lifting device 14 and obliquely placed material guide plate 15, printing platform 100 is detachably mounted on lifting device 14, printing platform 100 is distributed with a plurality of through holes, material guide plate 15 is arranged on mounting frame 11b, and is used for guiding workpiece to discharge; lifting device 14 has vertical guide mechanism and lifting driving mechanism, the vertical guide mechanism is connected on mounting frame 11b, the lifting driving mechanism drives printing platform 100 to lift on mounting frame 11b along the vertical guide mechanism, the lifting driving mechanism can be screw thread screw mechanism, air cylinder or hydraulic cylinder etc., the vertical guide mechanism 411 can be slide rail, guide column or dovetail groove etc.

[0058] As shown in Figure 1, driving device 13 is arranged on mounting frame 11b, and driving device 13 is used for driving stripping assembly 200 to reciprocate along the horizontal plane of printing platform 100. Driving device 13 can be screw thread screw mechanism, belt mechanism etc.

[0059] Figures 2-3 are structural schematic diagrams of an embodiment of stripping assembly 200 in the 3D printing device 10 of the application. Stripping assembly 200 includes stripping piece 210, turnover piece 220 and mounting piece 270, wherein stripping piece 210 is used for stripping workpiece from printing platform 100, turnover piece 220 is used for turning over the stripped workpiece, and stripping piece 210 and turnover piece 220 are detachably mounted on mounting piece 270. The purpose of arranging turnover piece is to turn over the workpiece in the front row to the rear row when the workpiece is stripped and discharged, so as to realize the tumbling of the workpiece along the discharge direction on stripping assembly 200, thereby ensuring that the workpiece will not be stacked layer by layer when printing in large quantities, and the problems of workpiece damage and shovel knife jamming damage to the equipment caused by mutual extrusion of the workpiece will not occur.

[0060] Stripping piece 210 has support part 212 and stripping part 211 which is inclined relative to the whole printing platform, stripping part 211 is rotatably mounted on mounting piece 270 through support part 212, stripping piece 210 has two working states of stripping and discharging, when the working state is stripping state (see Figure 2), the included angle between stripping part 211 and the horizontal plane of printing platform 100 is 10°~60°, preferably 15°~30°, when the angle is less than 10°, the workpiece is not easy to be turned over by turnover piece 220, when the angle is greater than 60°, the cutting resistance between the workpiece and blade 312 increases, which is easy to cause damage to the workpiece; when the working state is discharging state (see Figure 3), stripping part 211 is above material guide plate 15, the included angle between stripping part 211 and the horizontal plane of printing platform 100 is 60°~90°, preferably 75°~90°, the workpiece falls to material guide plate 15 under the action of gravity, thereby improving the discharging rate of the workpiece on stripping piece 210.

[0061] In the embodiment shown in FIGS. 2-4, the turnover member 220 in the stripping assembly 200 is vertically arranged, and the cross section of the side facing the workpiece to be stripped is arc-shaped as a whole. Specifically, the turnover member 220 can be an arc-shaped plate as a whole or a polygonal structure with multiple rectangular plates connected to form an arc-shaped cross section as a whole. When the polygonal structure is used, the advantage is that when some of the rectangular plates are damaged or need to be cleaned, they can be replaced individually without replacing the entire turnover member 220. When applied to mass printing, the separation success rate and the feeding rate of the workpiece can reach 100%.

[0062] As shown in FIGS. 5 and 6, in another embodiment, the turnover member 220 in the stripping assembly 200 includes two turnover plates 223, which are detachably mounted at the ends of the mounting member 270. The two turnover plates 223 are angularly connected to each other (see FIGS. 5-6), and the openings face the side of the workpiece to be stripped. When the included angle between the two turnover plates 223 is greater than 90°, the separation success rate and the feeding rate of the workpiece can reach 100%. When the included angle between the two turnover plates 223 is less than 90°, the separation success rate of the workpiece is 95%, and the feeding rate is 98%.

[0063] The applicant has conducted experiments on the separation success rate and the feeding rate of the turnover member 223 with different cross-sectional structures, and the experimental results are as follows:

[0064] Table 1 Experimental results of the separation success rate and the feeding rate of the turnover member with different cross-sectional structures

[0065] Turnover member cross-sectional structure Arc-shaped obtuse-angle joint Acute-angle joint Vertical plane Separation success rate (%) 100 100 95 85 Feeding rate (%) 100 100 98 82

[0066] As shown in FIG. 7, in still another embodiment, the turnover member 220 in the stripping assembly 200 includes a mounting plate 224 and a poking piece 225. The mounting plate 224 is detachably vertically mounted on the mounting member 270. At least one poking piece 225 is rotatably arranged on the mounting plate 224. The poking piece is driven by a motor to swing up and down around the rotation shaft (see FIG. 7). Alternatively, a poking gear 226 is arranged on the mounting plate 224, so that the poking gear 226 replaces the poking piece 225 in FIG. 7. The poking gear 226 is driven by a motor to rotate (see FIG. 8).

[0067] In combination with FIGS. 9-17, another embodiment of the stripping assembly 200 is presented. The stripping member 210 includes a stripping portion 211 and a support portion 212 connected to the stripping portion 211. The support portion 212 has multiple contact structures 21a capable of contacting the workpiece and multiple non-contact structures 21b recessed relative to the contact structures 21a and not contacting the workpiece.

[0068] In the process of stripping member 210 moving relative to the printing platform 100 and stripping the workpiece from the printing platform 100, the stripping part 211 first contacts the workpiece and is inserted between the workpiece and the printing platform 100 to gradually separate the bottom surface of the workpiece from the printing platform 100, and the part of the workpiece separated from the printing platform 100 is supported by the supporting part 212. After the workpiece is completely separated from the printing platform 100, the workpiece supported by the supporting part 212 will further come to the turnover member 220. Under the action of the turnover member 220, the workpiece rolls towards the discharging direction, so as to ensure that multiple workpieces located on the printing platform 100 will not be damaged due to mutual extrusion during the process of being stripped from the printing platform 100.

[0069] Because the supporting part 212 has multiple contact structures 21a and multiple non-contact structures 21b, the multiple contact structures 21a can cooperate with each other to support the workpiece, and the multiple non-contact structures 21b are all not in contact with the workpiece. The existence of the multiple non-contact structures 21b will make a part of the area of the supporting part 212 not in contact with the workpiece. In this way, only a part of the area of the supporting part 212, instead of the whole area, is in contact with the workpiece, so as to reduce the contact area between the supporting part 212 and the workpiece, increase the difficulty of the workpiece adhering to the supporting part 212, and reduce the difficulty of the workpiece flowing to the turnover member 220. In addition, the multiple contact structures 21a and the multiple non-contact structures 21b cooperate with each other, a non-contact structure 21b is arranged between two contact structures 21a, and a contact structure 21a is arranged between two non-contact structures 21b. In this way, the bottom surface of the same workpiece will correspond to the contact structure 21a and the non-contact structure 21b at the same time, and only a part of the area of the bottom surface of the workpiece will be in contact with the supporting part 212, so as to reduce the contact area between the workpiece and the supporting part 212, increase the difficulty of the workpiece adhering to the supporting part 212, and reduce the difficulty of the workpiece flowing to the turnover member 220.

[0070] Therefore, by arranging the multiple non-contact structures 21b on the supporting part 212, the workpiece that has been stripped from the printing platform 100 by the stripping member 210 will not easily adhere to the supporting part 212 and will smoothly flow to the turnover member 220, so as to avoid the workpiece adhering to the supporting part 212 and hindering the stripping of other workpieces on the printing platform 100, and avoid multiple workpieces being damaged due to mutual extrusion at the supporting part 212. The arrangement of the non-contact structure 21b and the turnover member 220 can make the workpiece more easily discharged and less likely to be damaged.

[0071] Specifically, the multiple contact structures 21a are composed of multiple protrusions 214 protruding from the supporting part 212, and the multiple non-contact structures 21b are composed of multiple grooves formed on the supporting part 212.

[0072] Fig. 9 and Fig. 10 show a schematic view of the structure of the stripping member 210 in one embodiment, wherein the support portion 212 is flat and a plurality of first grooves 213 are formed through the support portion 212, the first grooves 213 are arranged along the Y axis and spaced apart from each other, and the first grooves 213 extend along a direction perpendicular to the Y axis to form a long strip. Thus, the plurality of first grooves 213 form a plurality of non-contact structures 21b on the support portion 212, and the surface of the support portion 212 between the adjacent two first grooves 213 is higher to form a contact structure 21a that can contact the workpiece.

[0073] Figs. 11 and 12 show a schematic view of the structure of the stripping member 210 in another embodiment, wherein the support portion 212 is flat, and a plurality of protrusions 214 are formed on the upper surface of the support portion 212, the protrusions 214 are arranged in an array, and the second grooves 215 are formed between the adjacent two protrusions 214. Thus, the plurality of protrusions 214 contact the workpiece to form a plurality of contact structures 21a, and the second grooves 215 between the plurality of protrusions 214 form a non-contact structure 21b. Further, the protrusions 214 have a spherical surface that can point contact the workpiece, so that the bottom surface of the workpiece point contacts the support portion 212 and is not easily adhered to the support portion 212.

[0074] It should be noted that the plurality of contact structures 21a can be separated by the non-contact structure 21b and independent of each other (as shown in Figs. 11 and 12), or the plurality of contact structures 21a can be connected together (as shown in Figs. 9 and 10), and the plurality of non-contact structures 21b can be connected together (as shown in Figs. 11 and 12) or can be spaced apart from each other (as shown in Figs. 9 and 10).

[0075] Figs. 9, 13 and 14 show that, in the present application, the stripping assembly 200 includes a mounting side plate 230, and the printing platform 100 and the mounting side plate 230 can move relative to each other along the Z axis and the X axis. The support portion 212 is rotatably connected to the mounting side plate 230 about the Y axis. It can be understood that, during the process that the printing platform 100 and the mounting side plate 230 move towards each other along the Z axis, the stripping member 210 can gradually move towards the printing platform 100 along with the mounting side plate 230, and after the stripping portion 211 contacts the printing platform 100, the stripping member 210 rotates relative to the mounting side plate 230 to change the angle between the stripping member 210 and the printing platform 100. During the process that the mounting side plate 230 and the printing platform 100 move relative to each other along the X axis, the stripping member 210 moves relative to the printing platform 100 to strip the workpiece from the printing platform 100.

[0076] Further, with the relative movement of the printing platform 100 and the mounting side plate 230 along the Z axis, the stripping member 210 rotates relative to the mounting side plate 230 to have a first limit position and a second limit position, in the first limit position, the included angle θ1 between the stripping member 210 and the X axis is greater than the included angle θ2 between the stripping member 210 and the X axis in the second limit position, wherein 5°≤θ2≤15°, θ1≤90°. It can be understood that the working state of the stripping member 210 in the first limit position is the unloading state, and the working state of the stripping member 210 in the second limit position is the stripping state.

[0077] It can be understood that the stripping assembly 200 comprises a reinforcing plate 240, and the support portion 212 is fixedly connected to the reinforcing plate 240 and is indirectly rotatably connected to the mounting side plate 230 through the reinforcing plate 240. Specifically, the support portion 212 is detachably locked to the reinforcing plate 240 through a locking member, so that a new stripping member 210 can be installed on the reinforcing plate 240 after the stripping portion 211 of the stripping member 210 is worn, so as to reduce the cost.

[0078] Further, the reinforcing plate 240 is rotatably connected to the mounting side plate 230 through a rotating shaft 242. The reinforcing plate 240 is further connected to a limiting protrusion 241, and the mounting side plate 230 is provided with a first abutting surface 231 and a second abutting surface 232. During the rotation of the reinforcing plate 240 relative to the mounting side plate 230, when the limiting protrusion 241 abuts against the first abutting surface 231, the stripping member 210 rotates to the first limit position relative to the mounting side plate 230, and when the limiting protrusion 241 abuts against the second abutting surface 232, the stripping member 210 rotates to the second limit position relative to the mounting side plate 230. In this way, the two limit positions of the rotation of the stripping member 210 relative to the mounting side plate 230 are defined by the stop of the limiting protrusion 241 by the first abutting surface 231 and the second abutting surface 232.

[0079] When the stripping member 210 is not in contact with the printing platform 100, the stripping member 210 and the reinforcing plate 240 are in the first limit position relative to the mounting side plate 230 under the action of their own gravity, and as the stripping member 210 gradually approaches the printing platform 100, the stripping portion 211 first contacts the printing platform 100, and the stripping member 210 gradually rotates to the second limit position relative to the mounting side plate 230. At this time, the minimum included angle θ2 between the stripping member 210 and the printing platform 100 is reached, and the stripping member 210 can exert a force on the workpiece to strip the workpiece from the printing platform 100 under the stop of the limiting protrusion 241 by the second abutting surface 232 during the movement of the stripping member 210 relative to the printing platform 100 along the X axis.

[0080] By setting the included angle θ2 between the stripping piece 210 and the printing platform 100 at the second limit position to be greater than or equal to 5° and less than or equal to 15°, it can be ensured that the included angle θ2 is small, so that the cutting resistance between the stripping piece 210 and the workpiece is small, and it is easier to completely strip the workpiece from the printing platform 100 without damaging the workpiece and partially remaining on the printing platform 100. Specifically, the included angle θ2 can be 5°, 7°, 9°, 11°, 13°, 15°, etc. In the embodiment of the present application, the included angle θ2 is 8.5°.

[0081] In combination with FIGS. 9 and 15, specifically in the present application, the turnover piece 220 includes a turnover portion 221 and a connecting portion 222, the turnover portion 221 has a front surface 22a capable of guiding the turnover of the workpiece and a back surface 22b opposite to the front surface 22a, and the connecting portion 222 is connected to the back surface 22b. The connecting portion 222 is connected with the mounting side plate 230. In the present application, the front surface 22a of the turnover portion 221 is a concave curved surface smoothly extending from the direction close to the support portion 212 to the direction away from the support portion 212, and after the workpiece flows to the turnover portion 221, the smooth front surface 22a will smoothly guide the turnover of the workpiece. It can be understood that the connecting portion 222 is welded with the turnover portion 221 to form an integral structure, and the connection of the turnover piece 220 with other structural members is realized through the connecting portion 222, which can avoid the appearance of connection marks on the front surface 22a of the turnover portion 221 when the turnover portion 221 is directly connected with other structural members, thereby affecting the smooth turnover of the workpiece. It can be understood that the turnover piece 220 and the stripping piece 210 are respectively connected with the mounting side plate 230, and the mounting side plate 230 drives the turnover piece 220 and the stripping piece 210 to move synchronously relative to the printing platform 100.

[0082] Further, the stripping assembly 200 includes a support beam 250 arranged between the connecting portion 222 and the mounting side plate 230, the connecting portion 222 is fixedly connected with the support beam 250, and the support beam 250 is movable relative to the mounting side plate 230 along the X-axis. It can be understood that after the connecting portion 222 is connected with the support beam 250, the support beam 250 can support the entire turnover piece 220. By enabling the support beam 250 to move relative to the mounting side plate 230 along the X-axis, the support beam 250 can drive the turnover piece 220 to move along the X-axis, so as to adjust the distance between the turnover piece 220 and the stripping piece 210, thereby facilitating the turnover piece 220 to smoothly receive the workpiece conducted from the stripping piece 210.

[0083] In combination with FIG. 9 and FIG. 15-17, specifically, the mounting side plate 230 is provided with a waist-shaped hole 233 (i.e. the waist-shaped hole 233 extends along the X-axis direction) along the X-axis direction, the support beam 250 is connected with a threaded connecting piece (not shown), the threaded connecting piece is arranged through the waist-shaped hole 233 and moves along the waist-shaped hole 233 synchronously with the support beam 250, and after the support beam 250 is moved to the position relative to the mounting side plate 230, the threaded connecting piece is screwed to lock the support beam 250 relative to the mounting side plate 230.

[0084] The stripping assembly 200 includes a shielding plate 260, which is located on the side of the back surface 22b, fixedly connected with the connecting part 222, and higher than the turnover part 221 along the Z-axis. It can be understood that the shielding plate 260 can block the workpiece on the side of the turnover part 221 away from the stripping part 211, so as to avoid the workpiece moving along the front surface 22a of the turnover part 221 and falling to the side of the back surface 22b of the turnover part 221. It can be understood that in some embodiments, when the height dimension of the turnover part 221 in the Z-axis direction is large, the shielding plate 260 can be omitted.

[0085] Specifically, the shielding plate 260 is fixedly connected with the support beam 250 and supported by the support beam 250. The shielding plate 260 abuts against the edge of the turnover part 221 along the Z-axis and is arranged obliquely. Further, when the support beam 250 moves along the X-axis relative to the mounting side plate 230, the shielding plate 260 can move synchronously with the support beam 250.

[0086] Specifically, the workpiece printed on the printing platform 100 is a dental film, and the height dimension of the dental film along the Z-axis is about 60mm, so that the shielding plate 260 and the turnover part 220 together need to be able to act on the workpiece within the height dimension of about 90mm along the Z-axis.

[0087] When the stripping assembly 200 shown in FIG. 9 is applied to the 3D printing device 10 shown in FIG. 1, the 3D printing device 10 includes a driving mechanism, which can drive the printing platform 100 to move so that the printing platform 100 is immersed in the liquid molding material in the resin tank, and can also drive the stripping assembly 200 to move relative to the printing platform 100, so that the stripping assembly 200 strips the workpiece from the printing platform 100.

[0088] Specifically, the driving device 13 and the lifting device 14 jointly constitute a driving mechanism. The lifting device 14 is connected with the printing platform 100 to drive the printing platform 100 to lift along the Z axis, and the driving device 13 is connected with the mounting side plate 230 to drive the mounting side plate 230 to translate along the X axis. The printing platform 100 is driven by the lifting device 14 to lift along the Z axis to approach or move away from the mounting side plate 230, and then the peeling piece 210 is driven to rotate relative to the mounting side plate 230 under the action of the printing platform 100 to change the inclination angle of the peeling piece 210. The mounting side plate 230 is driven by the driving device 13 to translate along the X axis, so that the peeling assembly 200 peels the workpiece. Specifically, the driving device 13 and the lifting device 14 can output driving force through the cooperation of air cylinders, sliding rails and sliding blocks.

[0089] Further, the mounting piece 270 is connected between the mounting side plate 230 and the driving device 13, and the mounting piece 270 can be a structural member or a combination of multiple structural members.

[0090] Specifically, in the present application, there are two mounting side plates 230, and the peeling assembly 200 is mounted between the two mounting side plates 230. There are two driving devices 13, and the two driving devices 13 are connected with the two mounting side plates 230 one by one. The two mounting side plates 230 provide support for the peeling assembly 200, and the two driving devices 13 can act synchronously to drive the two mounting side plates 230 to move synchronously, thereby improving the motion stability of the peeling assembly 200 relative to the printing platform 100. In addition, the supporting beam 250 is connected with the two mounting side plates 230 at both ends along the Y axis, so that the supporting beam 250 can also maintain the relative position stability of the two mounting side plates 230, so that the overall structure is more stable.

[0091] The technical features of the above-mentioned embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0092] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A 3D printing device, comprising: a printing platform; and a stripping assembly comprising a stripping member and a flipping member, the stripping member being configured to strip a workpiece from the printing platform, and the flipping member being configured to flip the workpiece. The 3D printing device comprises a driving device configured to drive the stripping assembly and the printing platform to move relative to each other.

2. The 3D printing device of claim 1, wherein, The stripping assembly further comprises a mounting member, and the stripping member and the flipping member are detachably mounted on the mounting member.

3. The 3D printing device of claim 2, wherein, The stripping member comprises a stripping portion which is inclined relative to the printing platform as a whole.

4. The 3D printing device of claim 2, wherein, The stripping member further comprises a supporting portion configured to drive the stripping portion to rotate, so that the stripping member has two working states, i.e., a stripping state and a discharging state.

5. The 3D printing device of claim 4, wherein, When the stripping member is in the stripping state, an included angle between the stripping portion and a contact portion of the printing platform is smaller than a corresponding included angle when the stripping member is in the discharging state.

6. The 3D printing device of claim 5, wherein, The flipping member is vertically arranged, and a cross section of the flipping member on a side facing the workpiece to be stripped is entirely arc-shaped or has an angle joint on the side facing the workpiece to be stripped.

7. The 3D printing device of claim 2, wherein, The angle joint is an obtuse angle joint.

8. The 3D printing device of claim 7, wherein, The flipping member comprises a vertically arranged mounting plate, and the mounting plate is provided with a poking piece which is driven to swing up and down by a motor, or the mounting plate is provided with a poking gear which is driven to rotate by a motor.

9. The 3D printing device of claim 2, wherein, 10.The 3D printing device according to claim 2, further comprising any one or a combination of the following two: The 3D printing device is a light-curing type, and further comprises a printing device, and the printing device can be a UV light irradiation device. The 3D printing device further comprises a resin tank configured to accommodate photosensitive resin. The 3D printing device has a lifting device, and the printing platform is detachably mounted on the lifting device. The 3D printing device further comprises a material guiding plate arranged on a discharging side of the printing platform. The stripping member comprises a stripping portion and a supporting portion connected to the stripping portion, and the supporting portion has a plurality of contact structures capable of contacting the workpiece and a plurality of non-contact structures recessed relative to the contact structures and not contacting the workpiece.

11. The 3D printing device of claim 1, wherein, The contact structures are formed by a plurality of protrusions protruding from the supporting portion, and the non-contact structures are formed by a plurality of grooves formed in the supporting portion.

12. The 3D printing device of claim 11, wherein, The protrusions have spherical surfaces capable of point contact with the workpiece.

13. The 3D printing device of claim 12, wherein, The stripping assembly comprises a mounting side plate, and the printing platform and the mounting side plate are capable of relative movement along a Z axis and an X axis; the supporting portion is rotationally connected to the mounting side plate about a Y axis.

14. The 3D printing device of claim 11, wherein, With the relative movement of the printing platform and the mounting side plate along the Z axis, the stripping member rotates relative to the mounting side plate to have a first limit position and a second limit position, and an included angle θ1 between the stripping member and the X axis at the first limit position is greater than an included angle θ2 between the stripping member and the X axis at the second limit position, where 5°≤θ2≤15° and θ1≤90°.

15. The 3D printing device of claim 14, wherein, The flipping member comprises a flipping portion and a connecting portion, the flipping portion has a front surface capable of guiding the workpiece to flip and a back surface opposite to the front surface, and the connecting portion is connected to the back surface; and the connecting portion is connected to the mounting side plate.

16. The 3D printing device of claim 14, wherein, ​ 17. The 3D printing device of claim 16, wherein, The peeling assembly comprises a support beam arranged between the connecting part and the mounting side plate, the connecting part is fixedly connected with the support beam, and the support beam is movable relative to the mounting side plate along the X axis.

18. The 3D printing device of claim 16, wherein, The peeling assembly comprises a shielding plate located on the back side and fixedly connected with the connecting part and higher than the turnover part along the Z axis.

19. The 3D printing device of claim 14, wherein, The 3D printing device comprises a driving device and a lifting device, the lifting device is connected with the printing platform to drive the printing platform to move along the Z axis, and the driving device is connected with the mounting side plate to drive the mounting side plate to move along the X axis.

20. The 3D printing device of claim 19, wherein, The mounting side plate has two, and the peeling assembly is mounted between the two mounting side plates; the driving device has two, and the two driving devices are connected with the two mounting side plates one by one.

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