A post-processing device for 3D printed objects, a 3D printing system and method

Abstract

The application provides a post-processing device for 3D printing objects, a 3D printing system and a method, the post-processing device comprising a receiving mechanism for carrying a 3D printing object with excess printing material; a movable mechanism for changing the dripping position of the 3D printing object to make the excess printing material drip from the 3D printing object; wherein the 3D printing object has at least two different inclination angles during the dripping position change. The application changes the dripping position of the 3D printing object, changes the inclination angle of the 3D printing object, separates the excess resin material on the 3D printing object, and improves the efficiency of separating the excess resin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular to a post-processing device for 3D printed objects, a 3D printing system and a method. BACKGROUND

[0002] 3D printing technology is a technology that can manufacture three-dimensional entities through 3D printing equipment in a layer-by-layer manner according to three-dimensional model data of an object. The 3D printing technology can overcome the special structural obstacles that cannot be achieved by current traditional mechanical processing, and realize the simple production of components with any complex structure. Current 3D printing technologies include stereolithography (SLA), digital light processing molding (DLP), liquid crystal display technology (LCD), fused deposition modeling (FDM), selective laser sintering (SLS), etc.

[0003] After the completion of 3D printing, due to the performance of the printing material itself, for example, the resin material has a certain viscosity, so that the resin material can adhere to the surface of the 3D printed object, resulting in the surface of the 3D printed object being covered with liquid resin. The presence of these resins will not only cause a large amount of material loss, but also increase the difficulty of subsequent processing. At present, the existing technology adopts the method of placing the printed part on the platform for a period of time after printing and then taking out the printed part, so as to facilitate the backflow of the resin to the tray.

[0004] However, due to the different forms of 3D printed objects, the above-mentioned existing technology for separating excess printing materials has poor separation effect and low efficiency. SUMMARY

[0005] The main purpose of the present application is to provide a post-processing device for 3D printed objects, a 3D printing system and a method, to solve the problem of poor separation effect and low efficiency of the existing technology for separating excess printing materials.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a post-processing device for 3D printed objects is provided, comprising:

[0007] a receiving mechanism for carrying a 3D printed object with excess printing materials;

[0008] a movable mechanism for changing the drop position of the 3D printed object to make the excess printing materials drop from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the drop position.

[0009] As an optional example, the movable mechanism is further used for:

[0010] maintaining the 3D printed object at at least one drop position for a predetermined time; or

[0011] continuously switching the 3D printed object between a plurality of the droplet positions; or

[0012] continuously switching the 3D printed object between a plurality of the droplet positions; or

[0013] As an optional example, the movable mechanism is further configured to: maintain the 3D printed object at a droplet position with an opening part of the liquid accumulation region downwards for a preset time; wherein the liquid accumulation region is formed by the structure of the 3D printed object itself.

[0014] According to another aspect of the embodiments of the present application, there is provided a device for post-processing of a 3D printed object, comprising:

[0015] a receiving mechanism configured to receive the 3D printed object with excess printing material;

[0016] a movable mechanism configured to set the 3D printed object at a first droplet position for a first time period to make the excess printing material drip from the 3D printed object; wherein the inclination angle of the 3D printed object in the first droplet position is determined based on a preset angle value and / or the shape feature of the 3D printed object.

[0017] As an optional example, the determination process of the inclination angle in the first droplet position comprises: determining an optimal droplet angle based on a preset angle matching model and the shape feature of the 3D printed object; and obtaining the inclination angle of the 3D printed object in the first droplet position according to the optimal droplet angle.

[0018] As an optional example, the first droplet position is a droplet position with an opening part of the liquid accumulation region downwards; wherein the liquid accumulation region is formed by the structure of the 3D printed object itself.

[0019] As an optional example, the above device further comprises: a temperature adjusting mechanism configured to generate a dynamic temperature distribution and / or adjust the temperature of the region where the 3D printed object is located based on a preconfigured temperature control strategy.

[0020] As an optional example, the dynamic temperature distribution comprises: controlling the temperature of the region where the 3D printed object is located to maintain at a first temperature at least in a first time period, and controlling the temperature of the region where the 3D printed object is located to maintain at a second temperature at least in a second time period, the first temperature being greater than or less than the second temperature.

[0021] As an optional example, the temperature control strategy comprises one or more of the following: controlling the temperature of the region where the 3D printed object is located to maintain a preset temperature range; or determining the temperature control parameters based on the material type and a preconfigured mapping relationship between material types and temperature control parameters.

[0022] As an optional example, the temperature adjustment mechanism adjusts the temperature of the region by one or more of the following: a quartz heating tube, a PTC heating source, an infrared heating source, a heated fluid, a heated gas, a heating plate, or a heat exchanger.

[0023] As an optional example, the temperature adjustment mechanism comprises a heat source and an air outlet assembly, which are used to generate heated gas to place the 3D printed object in the heated gas.

[0024] As an optional example, the air outlet assembly has a plurality of air outlets, and the air blowing area formed by the plurality of air outlets covers the 3D printed object; or the plurality of air outlets move to cover the 3D printed object.

[0025] As an optional example, the air outlet of the air outlet assembly is arranged above or beside the 3D printed object, and the heat source is arranged at the air outlet.

[0026] As an optional example, the above device further comprises a temperature sensor for detecting the temperature of the region; wherein the working state of the temperature adjustment mechanism is controlled based on the detection data of the temperature sensor.

[0027] As an optional example, the above device further comprises an air outlet mechanism for generating flowing gas to place the 3D printed object in the flowing gas to accelerate the flow of the excess printing material.

[0028] As an optional example, the above device further comprises a vibration mechanism for vibrating the 3D printed object to accelerate the flow of the excess printing material.

[0029] As an optional example, the above device further comprises a material recycling mechanism for collecting at least part of the excess printing material.

[0030] As an optional example, the material recycling mechanism comprises a filter assembly.

[0031] As an optional example, the material recycling mechanism comprises a first container and a second container, the first container is in communication with the second container, and the second container is arranged on the side away from the temperature adjustment mechanism.

[0032] As an optional example, the movable mechanism comprises a driving component; the receiving mechanism is connected with the driving component, so that the receiving mechanism and the drop position of the 3D printing object are driven to change by the driving component.

[0033] As an optional example, the movable mechanism comprises a poking member arranged in the receiving mechanism, and the poking member is used to drive the 3D printing object to switch the drop position.

[0034] As an optional example, the movable mechanism comprises a grabbing member, which is used to enter the receiving mechanism and grab the 3D printing object, so as to drive the 3D printing object to switch the drop position.

[0035] As an optional example, the receiving mechanism comprises a receiving body, which has an opening, a liquid outlet and a receiving cavity for accommodating the printing member, the opening is communicated with the receiving cavity, and the liquid outlet is communicated with the receiving cavity.

[0036] As an optional example, the receiving mechanism comprises a net structure.

[0037] As an optional example, the receiving mechanism further comprises a cover plate, which is arranged opposite to the opening and is arranged on the receiving body to open or close the opening.

[0038] According to another aspect of the embodiments of the present application, a post-processing method for a 3D printing object is also provided, which comprises: carrying a 3D printing object with excess printing material; changing the drop position of the 3D printing object to make the excess printing material drop from the 3D printing object; wherein the 3D printing object has at least two different inclination angles during the change of the drop position.

[0039] As an optional example, the above method further comprises:

[0040] maintaining the 3D printing object at the at least one drop position for a preset time; or

[0041] continuously switching the 3D printing object between a plurality of drop positions; or

[0042] maintaining the 3D printing object at the at least one drop position for a preset time and continuously switching the 3D printing object between a plurality of drop positions.

[0043] As an optional example, the above method further comprises: maintaining the 3D printing object at a drop position where the opening part of the liquid accumulation area is downward for a preset time; wherein the liquid accumulation area is formed by the structure of the 3D printing object itself.

[0044] According to yet another aspect of the embodiments of the present application, there is also provided a post-processing method for 3D printed objects, comprising:

[0045] carrying a 3D printed object with excess printing material;

[0046] setting the 3D printed object at a first dripping position for a first time period, so as to make the excess printing material drip from the 3D printed object; wherein the inclination angle of the 3D printed object in the first dripping position is determined based on a preset angle value and / or the shape feature of the 3D printed object.

[0047] As an optional example, the determination process of the inclination angle in the first dripping position comprises: determining an optimal dripping angle based on a preset angle matching model and the shape feature of the 3D printed object; and obtaining the inclination angle of the 3D printed object in the first dripping position according to the optimal dripping angle.

[0048] As an optional example, the first dripping position is a downward dripping position of the opening part of the liquid accumulation area; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0049] As an optional example, the above method further comprises: generating a dynamic temperature distribution and / or adjusting the temperature of the area where the 3D printed object is located based on a preconfigured temperature control strategy.

[0050] As an optional example, the dynamic temperature distribution comprises at least controlling the temperature of the area where the 3D printed object is located to maintain at a first temperature for a first time period, and at least controlling the temperature of the area where the 3D printed object is located to maintain at a second temperature for a second time period, the first temperature being greater than or less than the second temperature.

[0051] As an optional example, the temperature control strategy comprises one or more of the following:

[0052] controlling the temperature of the area where the 3D printed object is located to maintain in a preset temperature value interval; or

[0053] determining the temperature control parameter based on the material type and a preconfigured mapping relationship between material types and temperature control parameters.

[0054] As an optional example, the above method further comprises: adjusting the area temperature by one or more of the following: quartz heating tube, PTC heating source, infrared heating source, heated fluid, heated gas, heating plate or heat exchanger.

[0055] As an optional example, the method further comprises applying a heated gas to place the 3D printed object in the heated gas.

[0056] As an optional example, the method further comprises obtaining temperature detection data; and controlling the working state of the temperature adjusting mechanism based on the temperature detection data.

[0057] As an optional example, the method further comprises applying a flowing gas to place the 3D printed object in the flowing gas to accelerate the flow of the excess printing material.

[0058] As an optional example, the method further comprises vibrating the 3D printed object to accelerate the flow of the excess printing material.

[0059] As an optional example, the method further comprises collecting at least part of the excess printing material.

[0060] As an optional example, the method further comprises filtering the collected excess printing material.

[0061] As an optional example, the method further comprises reusing the filtered excess printing material in a subsequent 3D printing; or mixing the filtered excess printing material with new printing material to reuse the mixed printing material in a subsequent 3D printing.

[0062] According to yet another aspect of embodiments of the present application, a 3D printing system is provided, comprising a 3D printer and a post-processing device for a 3D printed object as described in any of the above, wherein the post-processing device is independently provided or integrally provided with the 3D printer.

[0063] According to yet another aspect of embodiments of the present application, a 3D printing method is provided, comprising: exposing a printing material to form a 3D printed object; and processing the 3D printed object by using a post-processing method for a 3D printed object as described in any of the above.

[0064] In the present application, the droplet position of the 3D printed object is changed, so that the inclination angle of the 3D printed object is changed. By adjusting the droplet angle, the entire droplet process is not fixed at a single droplet position, which can better separate the excess resin material on the 3D printed object, and improve the efficiency of separating the excess resin. At the same time, the device provided by the present application can achieve a better resin separation effect, reduce the solvent consumption and cleaning time in the later cleaning, and can also recycle the separated resin. BRIEF DESCRIPTION OF DRAWINGS

[0065] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an implementation of the application and, together with the description, serve to explain the application. In the drawings,

[0066] Figure 1 is a front view of a post-processing device for 3D printed objects according to an embodiment of the application;

[0067] Figure 2 is a right view of a receiving mechanism and a 3D printed object according to an embodiment of the application;

[0068] Figure 3 is a structural schematic view of a 3D printed object;

[0069] Figure 4 is a schematic view of a prior art cleaning of excess resin by centrifugation;

[0070] Figure 5 is a front view of another post-processing device for 3D printed objects according to an embodiment of the application;

[0071] Figure 6 is a front view of a movable mechanism according to an embodiment of the application;

[0072] Figure 7 is a front view of another movable mechanism according to an embodiment of the application;

[0073] Figure 8 is a front view of another movable mechanism according to an embodiment of the application;

[0074] Figure 9 is a front view of another movable mechanism according to an embodiment of the application;

[0075] Figure 10 is a structural schematic view of a receiving mechanism according to an embodiment of the application;

[0076] Figure 11 is a front view of a post-processing device for 3D printed objects according to an embodiment of the application;

[0077] Figure 12 is a schematic view of a dynamic temperature distribution according to an embodiment of the application;

[0078] Figure 13 is a front view of a post-processing device for 3D printed objects according to an embodiment of the application;

[0079] Figure 14 is a front view of a post-processing device for 3D printed objects according to an embodiment of the application;

[0080] Figure 15This is a front view of a post-processing device for 3D printed objects provided in an embodiment of the present invention;

[0081] Figure 16 This is a schematic diagram of centrifugal force.

[0082] The above figures include the following reference numerals:

[0083] 1. 3D printed object; 11. Liquid accumulation area; 2. Material receiving mechanism; 21. Material receiving body; 210. Opening; 211. Liquid outlet; 212. Receiving cavity; 22. Cover plate; 3. Movable mechanism; 31. Driving component; 32. Actuating component; 33. Guide part; 34. Track; 35. Gripping component; 4. Temperature regulation mechanism; 41. Air outlet assembly; 42. Heat source; 43. Guide rail; 44. Temperature sensor; 5. Material recycling mechanism; 51. Filter assembly; 52. First container; 53. Second container; 6. Excess printing material. Detailed Implementation

[0084] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0085] like Figure 1 , Figure 2 As shown, the present invention provides a post-processing device for 3D printed objects, comprising: a receiving mechanism 2 for carrying a 3D printed object 1 with excess printing material 6; and a movable mechanism 3 for changing the dripping position of the 3D printed object 1 to cause the excess printing material 6 to drip off the 3D printed object 1; wherein, during the change of the dripping position, the 3D printed object 1 has at least two different tilt angles. In the present invention, the excess printing material 6 is mainly dripped off the 3D printed object 1 by gravity or the resultant force of gravity plus other forces (such as the force of wind, the force of vibration, etc.), and gravity or the resultant force of gravity plus other forces drives the excess printing material 6 away from the surface of the 3D printed object 1.

[0086] It should be noted that the 3D printed object 1 includes a solid or semi-solid polymer, and the excess printing material 6 includes an uncured polymer resin. After the completion of 3D printing, due to the performance of the printing material itself, for example, the resin material has a certain viscosity, so that the resin material can adhere to the surface of the 3D printed object 1, resulting in the surface of the 3D printed object 1 being covered with unused polymer resin brought out from the printing area; or due to the structure of the 3D printed object 1 itself, which is in a fixed position during the molding process, there are many liquid accumulation areas on the 3D printed object 1, such as inverted cup mouth structure, C-shaped dental mold, hollow dental mold, etc., and there is a lot of uncured resin material in these liquid accumulation areas. The existence of these resins not only causes a large amount of material loss, but also increases the difficulty of subsequent processing, so it is necessary to separate these excess resins from the 3D printed object 1.

[0087] In the embodiments of the present application, the drop position of the 3D printed object 1 is changed, which can change the inclination angle of the 3D printed object 1 to make the excess printing material 6 drop from the 3D printed object 1. By adjusting the drop angle, the entire dripping process is not single fixed at a certain drop position, which can better separate the excess resin material on the 3D printed object 1, and improve the efficiency of separating the excess resin. At the same time, through the device provided by the present application, a better resin separation effect can be achieved, the solvent consumption and cleaning time during the later cleaning can be reduced, and the separated resin can be recycled. In some application scenarios, the 3D printed object 1 can be directly solidified after dripping, which is not limited by the present application.

[0088] As shown in Figure 2 (a), Figure 2 (b) and Figure 2 (c), the 3D printed object 1 is arranged in the receiving mechanism 2, and the 3D printed object 1 changes position following the receiving mechanism 2. The receiving mechanism 2 and the 3D printed object 1 are shown in three different drop positions in the figure, which are denoted as drop position a, drop position b, and drop position c. It can be understood that the receiving mechanism 2 and the 3D printed object 1 have different inclination angles in different drop positions. The inclination angle represents the included angle of the 3D printed object 1 relative to the vertical direction (Z direction in the figure), and the value range of the inclination angle is -180°~+180°. Exemplarily, the inclination angle is determined based on the bottom edge of the 3D printed object 1 in contact with the receiving mechanism 2. Exemplarily, the drop position can be customized based on user demand, for example, the drop position and the inclination angle correspond to each other, and the inclination angle changes once every time the drop position changes; or they are separately set, and the inclination angle changes multiple times every time the drop position changes. In specific applications, by changing the inclination angle multiple times, the drop position of the 3D printed object 1 is changed, which is beneficial to separate the excess resin material in different surfaces and liquid accumulation areas of the 3D printed object 1.

[0089] Further, the movable mechanism 3 is further configured to: keep the 3D printed object 1 at at least one drop position for a preset time; or continuously switch the 3D printed object 1 between several drop positions; or keep the 3D printed object 1 at at least one drop position for a preset time and continuously switch the 3D printed object 1 between several drop positions. The preset time t can be 10s, 30s, 1min, 3min, 5min, etc., which is not limited in the present application.

[0090] It can be understood that the movable mechanism 3 in the present application is used to control the drop position of the 3D printed object 1, and after changing the drop position, the 3D printed object 1 can be kept at any drop position, that is, the entire drop process is not single fixed at a certain drop position. For example, the preset time of different drop positions can be set to be the same or different, for example, the 3D printed object 1 is kept at drop position a for 1min, then the 3D printed object 1 is changed to drop position b at any speed and kept for 3min, and then the 3D printed object 1 is changed to drop position c and kept for 1min; the 3D printed object 1 can also be continuously switched between drop positions a, b and c, for example, the 3D printed object 1 is continuously switched according to a-b-c-a or a-c-b-c-a; the 3D printed object 1 can also be continuously switched between drop positions a and c and kept at drop position b for t time, for example, the 3D printed object 1 is continuously switched between drop positions a and c at any speed according to a-c-c-a in t1-t2 time period, then the 3D printed object 1 is changed to drop position b at t2 time, and then kept for t time.

[0091] Referring to Figure 3 In an embodiment, the movable mechanism 3 is further configured to keep the 3D printed object 1 at a drop position where the opening part of the liquid accumulation area 11 is downward for a preset time; wherein the liquid accumulation area 11 is formed by the structure of the 3D printed object 1 itself. In specific applications, if the 3D printed object 1 has a liquid accumulation area 11 caused by a special structure, such as an inverted cup structure, the drop position where the cup part of the inverted cup structure is downward can be recorded as drop position b, and then the drop position b is kept for t time and the other positions are continuously switched, which can further improve the efficiency of separating the excess resin material.

[0092] As Figure 4 shown, a method for cleaning excess resin by centrifugation in the prior art is shown, the rotation of the rotor generates centrifugal force to drive the excess printing material away from the rotation center and away from the surface of the object, and the inclination angle of the 3D printed object 1 does not change during the centrifugation process. In combination with Figure 3 , Figure 4It can be seen that for some 3D printed objects 1 with special structures, such as inverted cup mouth structures, C-shaped dental molds, hollow dental molds, etc., there will be some liquid accumulation areas 11. When the resin is spun off by the centrifugal method, if the opening in the liquid accumulation area 11 is small or not set downward, the resin in the liquid accumulation area 11 is not easy to be removed. Therefore, the centrifugal method cannot well clean the above-mentioned liquid accumulation area 11, and it is easy to cause the resin material in the liquid accumulation area to be spun off, and the effect of centrifugal cleaning is not good. In addition, the speed and time of centrifugal cleaning are not easy to control, and for objects with fragile structures, it is easy to be damaged under the action of centrifugal force for a long time. If the centrifugal force is too large, it will cause the equipment to vibrate and the noise to be too large, the equipment is unstable and the resin splashes, which is not easy to collect. As shown in Figure 16 , the direction of the centrifugal force in the centrifugal process is along the tangent direction, and the resin material will fly out along the tangent direction under the action of the centrifugal force.

[0093] And by using the device in the present application, by adjusting the drop angle, the whole drop process is not single fixed at a certain drop position, mainly through the combined force of gravity or gravity plus other forces (such as the force of wind blowing, the force of vibration, etc.) to make the excess printing material drop from the 3D printed object, which can better separate the excess resin material on the 3D printed object 1, improve the efficiency of separating the excess resin, and at the same time will not cause damage to the 3D printed object. Among them, in the process of resin material dropping, the resin material can fall vertically, and can also fall in a parabolic shape under the action of wind force, similar to the process of raining, and the resin material will not fly out.

[0094] In one embodiment, the movable mechanism 3 includes a driving component 31, and the material receiving mechanism 2 is connected with the driving component 31, so as to change the drop position of the 3D printed object 1 by driving the material receiving mechanism 2 and the driving component 31.

[0095] Specifically, the driving component 31 includes a rotating shaft, for example, the rotating shaft of a motor, and the rotating shaft of the motor is connected with the material receiving mechanism 2. The motor drives the 3D printed object 1 to rotate along the A axis, so as to change the drop position of the 3D printed object 1, as shown in Figure 1 . In some embodiments, the motor drives the 3D printed object 1 to rotate along the B point, so as to change the drop position of the 3D printed object 1, as shown in Figure 5 . Among them, the rotating speed of the motor rotating shaft can be set to be slow, that is, much smaller than the rotating speed of the centrifugal device, for example, 50 r / min or below 50 r / min or smaller, such as 5 r / min, 10 r / min, 15 r / min, 20 r / min, 30 r / min, etc., and in the rotating process, the excess resin material mainly drops through gravity, and basically does not utilize centrifugal force. Of course, the rotating speed can also be set to be above 50 r / min according to the demand, and the combined force of gravity plus slight centrifugal force is used to make the excess resin material drop, and the present application does not limit the rotating speed.

[0096] It should be noted that the rotation axis of the driving component 31 in the embodiment is configured to be non-parallel to the vertical direction (the direction of gravity), and optionally, the rotation axis of the driving component 31 is perpendicular to the vertical direction (the direction of gravity), so that the droplet position of the 3D printed object 1 can be changed, i.e., the inclination angle relative to the vertical direction is changed. The excess resin material in the present application is mainly separated by gravity, and the structure is simpler and the separation efficiency is higher.

[0097] Referring to Figure 6 In one embodiment, the movable mechanism 3 includes a poking member 32 arranged in the material receiving mechanism 2, and the poking member 32 is used to drive the 3D printed object 1 to switch the droplet position. Exemplarily, the poking member 32 is connected with a track 34 and a driving member (not shown in the figure), and the driving member can drive the poking member 32 to move along the track 34, such as the left-right direction in Figure 6 During the movement of the poking member 32, the poking member 32 contacts and pokes the 3D printed object 1, so that the 3D printed object 1 is inclined, i.e., the droplet position of the 3D printed object 1 is changed, so as to separate the excess printing material 6 from the 3D printed object 1. It should be noted that the position of the material receiving mechanism 2 in the embodiment can remain unchanged.

[0098] Further, as shown in Figure 7 , a guide portion 33 is arranged on the side of the material receiving mechanism 2 away from the poking member 32. During the movement of the poking member 32, the poking member 32 contacts and pushes the 3D printed object 1 to move to the guide portion 33, so that the 3D printed object 1 is inclined, i.e., the droplet position of the 3D printed object 1 is changed, so as to separate the excess printing material 6 from the 3D printed object 1. In specific applications, the 3D printed object 1 can be kept at any droplet position for a predetermined time t by the poking member 32. The driving member can be provided in a telescopic structure, such as a pneumatic cylinder, etc., which can realize the up-down movement of the poking member 32. After the 3D printed object 1 is poked to the leftmost side, the poking member 32 is retracted, and then the poking member 32 is moved to the leftmost side, so that the 3D printed object 1 can be moved to the initial position by moving the poking member 32 to the right.

[0099] Further, as shown in Figure 8 , guide portions 33 are arranged on both sides of the material receiving mechanism 2, and the poking member 32 is provided with two. Through the left-right movement of the two poking members 32, the 3D printed object 1 can be continuously switched between a plurality of said droplet positions, so as to separate the excess printing material 6 from the 3D printed object 1.

[0100] Referring to Figure 9In an embodiment, the movable mechanism 3 comprises a grabbing member 35 for entering the receiving mechanism 2 and grabbing the 3D printed object 1 to move the 3D printed object 1 to switch the droplet position. Exemplarily, the grabbing member 35 is connected with a track 34 and a driving member (not shown in the figure), and the driving member is capable of moving the poking member 32 along the track 34 and moving up and down in the vertical direction. For example, the grabbing member 35 is a mechanical hand, which can change the inclination angle of the 3D printed object 1 after grabbing and placing the 3D printed object 1, i.e. change the droplet position of the 3D printed object 1 to separate the excess printing material 6 from the 3D printed object 1.

[0101] Referring to Figure 10 The receiving mechanism 2 comprises a receiving body 21 having an opening 210, a liquid outlet 211 and a receiving cavity 212 for accommodating the printing member, the opening 210 is in communication with the receiving cavity 212, and the liquid outlet 211 is in communication with the receiving cavity 212. One or more 3D printed objects 1 are placed in the receiving cavity 212, which can separate the excess resin material individually or in large quantities at the same time. Further, the receiving mechanism 2 further comprises a cover plate 22, which is arranged opposite to the opening 210, and the cover plate 22 is arranged on the receiving body 21 to open or close the opening 210. The cover plate 22 can be connected with the receiving body 21 by magnetic attraction or buckle, which is not limited by the present application.

[0102] It can be understood that, in the case of adding the cover plate 22, the cover plate 22 makes the 3D printed object 1 not to be separated from the receiving mechanism 2 during the rotation process, thereby increasing the inclination angle range of the 3D printed object 1. Exemplarily, the receiving mechanism 2 comprises a net structure, and the net can be made of metal material, the net has the opening 210 and the cover plate 22 at the top, and the net has a plurality of liquid outlets 211 on the bottom and the sidewall.

[0103] Referring to Figure 11 In some embodiments, the post-processing device further comprises a temperature adjusting mechanism 4 for generating a dynamic temperature distribution and / or adjusting the temperature of the area where the 3D printed object 1 is located based on a pre-configured temperature control strategy. Specifically, the temperature adjusting mechanism 4 adjusts the temperature of the area by one or more of the following: quartz heating tube, PTC heating source, infrared heating source, heated fluid, heated gas, heating plate or heat exchanger.

[0104] Specifically, the dynamic temperature distribution comprises at least controlling the temperature of the area where the 3D printed object 1 is located to maintain at a first temperature in a first time period, and at least controlling the temperature of the area where the 3D printed object 1 is located to maintain at a second temperature in a second time period, the first temperature being greater than or less than the second temperature.

[0105] It should be noted that the 3D printed object 1 in this embodiment is a solid or semi-solid polymer without a solidification process, which is prone to deformation when exposed to high temperature for a long time. Through dynamic temperature control, the viscosity of the excess resin material can be reduced, and the deformation of the 3D printed object 1 caused by excessive temperature can be avoided. For example, as shown in Figure 12 (a), the temperature of the control area is first high and then low. The temperature of the area is increased in the time period 0-t1 to reduce the viscosity of the resin material and improve the separation efficiency of the resin material. Then the temperature is reduced after t1 to avoid deformation of the 3D printed object 1 caused by excessive temperature due to long time heating; or, as shown in Figure 12 (b), if the 3D printed object 1 adheres more resin on the surface when it leaves the printing area, the resin flows faster under the action of force when there is more resin. Low temperature can be used in the time period 0-t1, and then the temperature of the area is increased in the time period t1-t2 to reduce the viscosity of the resin material. Then the temperature is reduced after t2 to avoid long time heating. In this embodiment, Figure 12 (a) and (b), the temperature of the area represents the set temperature value. Since the time of temperature change depends on the power of the heater / cooling device, the process time of heating or cooling is not shown in the figure. The figure is an example of setting temperature. In specific applications, the temperature increasing process can be slow.

[0106] Specifically, the temperature control strategy includes one or more of the following: controlling the temperature of the area where the 3D printed object 1 is located to maintain a preset temperature value range; or determining the temperature control parameter based on the material type and the mapping relationship between the material type and the temperature control parameter.

[0107] For example, as shown in Figure 12 (c), for some 3D printed objects 1 that are not prone to deformation or do not require high precision, the temperature of the area where the 3D printed object 1 is located can be controlled to maintain a preset temperature value range throughout the droplet to improve the separation efficiency of the excess resin material. In some embodiments, a database can also be established based on the mapping relationship between the printing material type and the temperature control parameter to configure different temperature control parameters for different printing materials. The temperature control parameter includes one or more of the heating start time, the heating end time, the heating duration, the temperature set value, the heat dissipation or cooling time. For example, for materials with high viscosity, the whole process temperature control mode as shown in Figure 12 (c) can be used.

[0108] In one embodiment, the post-processing device further comprises a temperature sensor 44 for detecting the temperature of the area or the environment; wherein the working state of the temperature adjusting mechanism 4 is controlled based on the detection data of the temperature sensor 44. The temperature sensor 44 can be installed on the material receiving structure 2 or near the heat source 42, as shown in Figure 13The temperature of the region is detected by the sensor, and the temperature can be adjusted in real time, so that the temperature of the region can be controlled more accurately.

[0109] With reference to Figure 13 , Figure 14 The temperature adjusting mechanism 4 comprises a heat source 42 and an air outlet assembly 41, which are used to generate heated gas to place the 3D printed object 1 in the heated gas. The air outlet assembly 41 has a plurality of air outlets, and the air blowing region formed by the plurality of air outlets covers the 3D printed object 1; or the plurality of air outlets are moved to cover the 3D printed object 1. For example, the air outlets of the air outlet assembly 41 are arranged above the 3D printed object 1, and the heat source 42 is arranged at the air outlets. The air outlet assembly 41 comprises a fan, a guide rail 43 and a driving member, and the driving member can drive the fan to move along the guide rail 43 to cover the entire 3D printed object 1, as shown in Figure 13 Alternatively, a plurality of fans or a fan with a plurality of air outlets are arranged, and the air blowing region of the fan can completely cover the 3D printed object 1, and the fan does not need to be moved, for example, two fans are arranged to overlap and cover the 3D printed object 1, as shown in Figure 14 It can be understood that, in the present application, the region temperature is controlled by the heated gas, so that the temperature distribution of the region where the 3D printed object 1 is located is uniform, the efficiency of resin separation is improved, and the deformation of the object caused by the excessively high temperature in some regions is avoided. In other embodiments, the air outlets of the air outlet assembly 41 can also be arranged at the side of the 3D printed object 1, and the heat source 42 can also be arranged at the side of the 3D printed object 1, which is not limited in the present application.

[0110] In another embodiment, the post-processing device further comprises an air outlet mechanism for generating flowing gas to place the 3D printed object 1 in the flowing gas to accelerate the flow of the excess printing material 6. For example, a high-pressure air gun or a high-pressure air knife is used to blow compressed air, and the force generated by the high-pressure air flow is used to accelerate the flow of the resin material to improve the separation efficiency.

[0111] In another embodiment, the post-processing device further comprises a vibration mechanism for vibrating the 3D printed object 1 to accelerate the flow of the excess printing material 6. For example, a vibrator is installed on the material receiving mechanism 2 to drive the material receiving mechanism 2 and the 3D printed object 1 to vibrate, and the force of the vibration is used to accelerate the flow of the resin material to improve the separation efficiency.

[0112] In some embodiments, as shown in Figure 13 , Figure 14As shown, the post-processing device further comprises a material recycling mechanism 5 for collecting at least part of the excess printing material 6. When the 3D printed object 1 leaves the printing area, more resin material is taken out. By providing the material recycling mechanism 5, the excess resin material can be recycled and used in subsequent 3D printing, thereby avoiding waste of materials and saving printing costs.

[0113] Further, as shown in Figure 15 The material recycling mechanism 5 is provided with a filtering assembly 51. It should be noted that the surface of the 3D printed object 1 can be attached with residual particles. The filtering assembly 51 can adopt a filter screen, which is arranged at the opening of the material recycling mechanism 5 and can filter the residues to avoid the recycled resin containing residues affecting the subsequent printing effect. The filtered excess printing material 6 can be directly reused in subsequent 3D printing, or the filtered excess printing material 6 can be mixed with new printing material for reuse in subsequent 3D printing.

[0114] Further, as shown in Figure 15 The material recycling mechanism 5 comprises a first container 52 and a second container 53 for containing the collected excess printing material 6. The first container 52 and the second container 53 are in communication, and the second container 53 is arranged away from the temperature adjusting mechanism 4. Exemplarily, the first container 52 is arranged below the material receiving mechanism 2, and the resin material therein is easily affected by the temperature adjusting mechanism 4, while the second container 53 is away from the heating area formed by the temperature adjusting mechanism 4, so as to avoid the recycled resin being exposed to the heating area for a long time, thereby avoiding the high temperature affecting the performance of the recycled resin. In an embodiment, the bottom of the first container 52 is provided with a flow guide portion, which is higher on the side away from the second container 53, so as to make the recycled resin material preferentially flow into the second container 53.

[0115] In another embodiment, a post-processing device for a 3D printed object comprises a material receiving mechanism 2 for carrying a 3D printed object 1 having excess printing material 6; a movable mechanism 3 is used to set the 3D printed object 1 at a first dripping position in a first time period to separate the excess printing material 6 adhered to the 3D printed object 1; wherein the inclination angle of the 3D printed object 1 in the first dripping position is determined based on a preset angle value and / or a shape feature of the 3D printed object 1.

[0116] In this embodiment, after the material receiving mechanism 2 carries the 3D printed object 1, the movable mechanism 3 moves the 3D printed object 1 to the first dripping position, for example Figure 2The first drop position of (a). It should be noted that the first drop position can be different for different 3D printed objects 1, and the movable mechanism 3 can be used to place different 3D printed objects 1 in different drop positions. For example, for a certain type of 3D printed object 1, the preset angle value in the first drop position is set based on empirical value, for example, 45°, that is, the inclination angle of the 3D printed object 1 is set to 45° for drop.

[0117] Optionally, the determination process of the inclination angle in the first drop position includes: determining the optimal drop angle based on the preset angle matching model and the shape feature of the 3D printed object 1; and obtaining the inclination angle of the 3D printed object 1 in the first drop position according to the optimal drop angle. For example, a machine learning model is established, the shape data of the 3D printed object 1 and the corresponding historical angle data are input, and the optimal drop angle corresponding to the 3D printed object 1 is automatically identified through machine learning. The optimal drop angle represents the angle at which the drop efficiency of the resin material in the 3D printed object 1 is the highest or the drop amount of the resin material is the largest, for example, the angle when the cup opening of the inverted cup structure is downward.

[0118] Optionally, the first drop position is a drop position with the opening part of the liquid accumulation area downward; and the liquid accumulation area is formed by the structure of the 3D printed object itself. In a specific application, if the 3D printed object 1 has a liquid accumulation area 11 caused by a special structure, for example, an inverted cup structure, the drop position with the cup opening of the inverted cup structure downward can be recorded as the first drop position, and then the drop is performed by staying in the first drop position for t time, which can improve the efficiency of separating the excess resin material.

[0119] In the embodiment, the above device can also use the temperature adjusting mechanism 4, the material recycling mechanism 5, the air outlet mechanism, the vibration mechanism and the like as described above to separate the excess printing material 6, and the implementation principle is the same as above, which will not be repeated here.

[0120] The application also provides a post-processing method for a 3D printed object, which comprises: carrying a 3D printed object 1 with excess printing material 6; changing the drop position of the 3D printed object 1 to separate the excess printing material 6 from the 3D printed object 1; wherein the 3D printed object 1 has different inclination angles in different drop positions.

[0121] It should be noted that the 3D printed object 1 includes a solid or semi-solid polymer, and the excess printing material 6 includes an uncured polymer resin. After the completion of 3D printing, due to the performance of the printing material itself, for example, the resin material has a certain viscosity, so that the resin material can adhere to the surface of the 3D printed object 1, resulting in the surface of the 3D printed object 1 being covered with unused liquid resin brought out from the printing area. Alternatively, due to the structure of the 3D printed object 1 itself, for example, a reverse cup structure, a C-shaped dental mold, a hollow dental mold, etc., there is a possibility that there is uncured resin material inside these structures. The presence of these resins not only causes a large amount of material loss, but also increases the difficulty of subsequent processing, so it is necessary to separate the excess resin from the 3D printed object 1.

[0122] In the embodiments of the present application, the inclination angle of the 3D printed object 1 is changed, which can change the dripping position of the 3D printed object 1. By multi-angle dripping, the excess resin material on the 3D printed object 1 can be separated, and the efficiency of separating the excess resin is improved. At the same time, the method provided by the present application uses non-single angle dripping, which is suitable for special structures such as reverse cup structure and recessed structure, and can achieve better resin separation effect, reduce solvent consumption and cleaning time during later cleaning, and also can recycle the separated resin. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, which is not limited by the present application.

[0123] In some embodiments, as shown in Figure 2 (a), Figure 2 (b) and Figure 2 (c), the 3D printed object 1 is arranged in the receiving mechanism 2, and the 3D printed object 1 changes position following the receiving mechanism 2. The figure shows three different dripping positions of the receiving mechanism 2 and the 3D printed object 1, which are referred to as dripping position a, dripping position b, and dripping position c. It can be understood that the receiving mechanism 2 and the 3D printed object 1 have different inclination angles in different dripping positions. Among them, the inclination angle represents the included angle of the 3D printed object 1 relative to the vertical direction (Z direction in the figure), and the value of the inclination angle is -180°~+180°. Exemplarily, the inclination angle is determined based on the bottom edge of the 3D printed object 1 in contact with the receiving mechanism 2. In specific applications, by changing the inclination angle multiple times, the dripping position of the 3D printed object 1 is changed, which is beneficial to separate the excess resin material on different surfaces of the 3D printed object 1 and in special structures.

[0124] Further, the method further comprises: maintaining the 3D printed object 1 at the at least one droplet position for a preset time; or continuously switching the 3D printed object 1 between a plurality of the droplet positions; or maintaining the 3D printed object 1 at the at least one droplet position for a preset time and continuously switching the 3D printed object 1 between a plurality of the droplet positions. The preset time t can be 10s, 30s, 1min, 3min, 5min, etc., which is not limited in the present application.

[0125] It can be understood that, in the present application, the droplet position of the 3D printed object 1 is controlled, and after the droplet position is changed, the 3D printed object 1 can be maintained at any droplet position, that is, the entire droplet layer is not fixed at a single droplet position. For example, the preset time of different droplet positions can be set to be the same or different. After the 3D printed object 1 is maintained at the droplet position a for 1min, the 3D printed object 1 is changed to the droplet position b for 3min, and then the 3D printed object 1 is changed to the droplet position c for 1min. The 3D printed object 1 can also be continuously switched between the droplet positions a, b and c, for example, the 3D printed object 1 is continuously switched according to a-b-c-a or a-c-b-c-a. The 3D printed object 1 can also be continuously switched between the droplet positions a and c and maintained at the droplet position b for t time, for example, the 3D printed object 1 is continuously switched between the droplet positions a and c according to a-c-c-a in the t1-t2 time period, then the 3D printed object 1 is changed to the droplet position b at the t2 moment, and then maintained for t time.

[0126] In a specific application, if the 3D printed object 1 has a special structure, such as a reverse cup mouth structure or a recessed structure, the cup mouth part of the reverse cup mouth structure can be recorded as the droplet position b, and then the method of stopping at the droplet position b for t time and continuously switching at other positions can be used for droplet, which can further improve the efficiency of separating excess resin material.

[0127] In an embodiment, the method further comprises: generating a dynamic temperature distribution and / or adjusting the temperature of the area where the 3D printed object 1 is located based on a preconfigured temperature control strategy.

[0128] The dynamic temperature distribution comprises at least maintaining the temperature of the area where the 3D printed object 1 is located at a first temperature in a first time period, and at least maintaining the temperature of the area where the 3D printed object 1 is located at a second temperature in a second time period, the first temperature being greater than or less than the second temperature.

[0129] It should be noted that the 3D printed object 1 in this embodiment is a solid or semi-solid polymer without a solidification process, which is prone to deformation when exposed to high temperature environment for a long time. Through dynamic temperature control, the viscosity of the excess resin material can be reduced, and at the same time, the deformation of the 3D printed object 1 caused by excessive temperature can be avoided. For example, as shown in Figure 12 (a), the temperature of the control area is first high and then low. The temperature of the area is increased in the time period 0-t1 to reduce the viscosity of the resin material and improve the separation efficiency of the resin material. Then the temperature is reduced after time t1 to avoid long time heating. Alternatively, as shown in Figure 12 (b), if the 3D printed object 1 adheres more resin on the surface when it leaves the printing area, the resin flows faster under the action of force when there is more resin. In the time period 0-t1, low temperature can be used, and then in the time period t1-t2, the temperature of the area is increased to reduce the viscosity of the resin material. Then the temperature is reduced after time t2 to avoid long time heating. Among them, Figure 12 The temperature of the area in (a) and (b) represents the set temperature value. Since the time of temperature change depends on the power of the heater / cooling device, the process time of heating or cooling is not shown in the figure. The figure is an example of setting temperature. In specific applications, the temperature rising process can be slow.

[0130] The temperature control strategy includes one or more of the following: controlling the temperature of the area where the 3D printed object 1 is located to maintain a preset temperature value range; or determining the temperature control parameter based on the material type and the mapping relationship between the material type and the temperature control parameter.

[0131] For example, as shown in Figure 12 (c), for some 3D printed objects 1 that are not easy to deform or do not require high precision, the temperature of the area where the 3D printed object 1 is located can be controlled to maintain a preset temperature value range throughout the droplet to improve the separation efficiency of the excess resin material. In some embodiments, a database can also be established based on the mapping relationship between the printing material type and the temperature control parameter to configure different temperature control parameters for different printing materials. The temperature control parameter includes one or more of the following: heating start time, heating end time, heating duration, temperature set value, heat dissipation or cooling time. For example, for materials with high viscosity, the whole process temperature control mode as shown in Figure 12 (c) can be used.

[0132] The method further includes adjusting the temperature of the area by one or more of the following: quartz heating tube, PTC heating source, infrared heating source, heated fluid, heated gas, heating plate or heat exchanger.

[0133] In one embodiment, the method further includes obtaining temperature detection data, and controlling the working state of the temperature adjusting mechanism 4 based on the temperature detection data.

[0134] Specifically, the temperature sensor 44 is configured to detect the area temperature or the ambient temperature, and the working state of the temperature adjusting mechanism 4 is controlled based on the detection data of the temperature sensor 44. The temperature sensor 44 can be installed on the material receiving structure 2 or near the heat source 42, as shown in Figure 13 By detecting the area temperature through the sensor, the temperature can be adjusted in real time, so that the area temperature can be controlled more accurately.

[0135] In an embodiment, the method further comprises: applying heated gas to make the 3D printed object 1 in the heated gas.

[0136] Referring to Figure 13 , Figure 14 , a temperature adjusting mechanism 4 is provided, which includes a heat source 42 and an air outlet assembly 41. The heat source 42 and the air outlet assembly 41 are configured to generate heated gas to make the 3D printed object 1 in the heated gas. The air outlet assembly 41 has a plurality of air outlets, and the air blowing area formed by the plurality of air outlets covers the 3D printed object 1, or the plurality of air outlets are moved to make the air blowing area cover the 3D printed object 1. For example, the air outlets of the air outlet assembly 41 are arranged above the 3D printed object 1, and the heat source 42 is arranged at the air outlets. The air outlet assembly 41 includes a fan, a guide rail 43 and a driving member. The driving member can drive the fan to move along the guide rail 43, so that the air blowing area of the fan covers the entire 3D printed object 1, as shown in Figure 13 . Alternatively, a plurality of fans or a fan with a plurality of air outlets are provided. In this case, the air blowing area of the fan can completely cover the 3D printed object 1, and the fan does not need to be moved, for example, two fans are arranged to overlap and cover the 3D printed object 1, as shown in Figure 14 . It can be understood that, in the present application, the area temperature is controlled by the heated gas, so that the temperature distribution of the area where the 3D printed object 1 is located is uniform, the efficiency of resin separation is improved, and the deformation of the object caused by the excessively high temperature in some areas is avoided. In other embodiments, the air outlets of the air outlet assembly 41 can also be arranged at the side of the 3D printed object 1, and the heat source 42 can also be arranged at the side of the 3D printed object 1, which is not limited in the present application.

[0137] In an embodiment, the method further comprises: applying flowing gas to make the 3D printed object 1 in the flowing gas to accelerate the flow of the excess printing material 6.

[0138] Specifically, an air outlet mechanism is provided, which is configured to generate flowing gas to make the 3D printed object 1 in the flowing gas to accelerate the flow of the excess printing material 6. For example, a high-pressure air gun or a high-pressure air knife is used to blow compressed air, and the force generated by the high-pressure air flow is used to accelerate the flow of the resin material to improve the separation efficiency.

[0139] In an embodiment, the method further comprises: causing the 3D printed object 1 to vibrate to accelerate the flow of the excess printing material 6.

[0140] Specifically, a vibrating mechanism is provided for causing the 3D printed object 1 to vibrate to accelerate the flow of the excess printing material 6. For example, a vibrator is installed on the receiving mechanism 2 to cause the receiving mechanism 2 and the 3D printed object 1 to vibrate, and the flow of the resin material is accelerated by the vibrating force to improve the separation efficiency.

[0141] In an embodiment, the method further comprises: collecting at least part of the excess printing material 6.

[0142] Further, the method further comprises: filtering the collected excess printing material 6.

[0143] Further, the method further comprises: reusing the filtered excess printing material 6 in subsequent 3D printing; or mixing the filtered excess printing material 6 with new printing material to reuse the mixed printing material in subsequent 3D printing.

[0144] In some embodiments, as shown in Figure 13 , Figure 14 A material recycling mechanism 5 is provided for collecting at least part of the excess printing material 6. When the 3D printed object 1 leaves the printing area, more resin material will be brought out. By providing the material recycling mechanism 5, the excess resin material can be recycled, and the recycled resin material can be used in subsequent 3D printing, thereby avoiding waste of materials and saving printing costs.

[0145] Further, as shown in Figure 15 , the material recycling mechanism 5 is provided with a filtering assembly 51. It should be noted that the surface of the 3D printed object 1 can be attached with residual particles. The filtering assembly 51 can adopt a filter screen, which is arranged at the opening of the material recycling mechanism 5 and can filter the residues to avoid the recycled resin containing residues affecting the subsequent printing effect. The filtered excess printing material 6 can be directly reused in subsequent 3D printing, or the filtered excess printing material 6 can be mixed with new printing material to reuse the mixed printing material in subsequent 3D printing.

[0146] Further, as shown in Figure 15As shown, the material recycling mechanism 5 includes a first container 52 and a second container 53 for containing the collected excess printing material 6. The first container 52 is in communication with the second container 53, and the second container 53 is arranged on a side away from the temperature adjusting mechanism 4. Exemplarily, the first container 52 is arranged below the material receiving mechanism 2, and the resin material therein is easily affected by the temperature adjusting mechanism 4, while the second container 53 is away from the heating area formed by the temperature adjusting mechanism 4, so that the recycled resin is prevented from being exposed to the heating area for a long time, thereby avoiding the influence of high temperature on the performance of the recycled resin. In an embodiment, the bottom of the first container 52 is provided with a flow guide portion, which is higher on a side away from the second container 53, so that the recycled resin material is preferentially flowed into the second container 53.

[0147] It should be noted that all the process steps of the post-processing method for the 3D printed object provided in the embodiments of the present application are implemented based on the post-processing device for the 3D printed object described above, and the working principles and beneficial effects of the two are one-to-one corresponding, and thus will not be repeated.

[0148] The present application also provides a post-processing method for a 3D printed object, comprising:

[0149] carrying a 3D printed object 1 with excess printing material 6;

[0150] arranging the 3D printed object 1 at a first dripping position in a first time period to separate the excess printing material 6 adhered to the 3D printed object 1; wherein the inclination angle of the 3D printed object 1 in the first dripping position is determined based on a preset angle value and / or the shape feature of the 3D printed object 1.

[0151] In an embodiment, the determination process of the inclination angle in the first dripping position includes: determining an optimal dripping angle based on a preset angle matching model and the shape feature of the 3D printed object 1; and obtaining the inclination angle of the 3D printed object 1 in the first dripping position according to the optimal dripping angle.

[0152] In an embodiment, the first dripping position is a downward dripping position of the opening part of the liquid accumulation area; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0153] It should be noted that all the process steps of the post-processing method for the 3D printed object provided in the embodiments of the present application are implemented based on the post-processing device for the 3D printed object described above, and the working principles and beneficial effects of the two are one-to-one corresponding, and thus will not be repeated.

[0154] The application further provides a 3D printing system, comprising a 3D printer and the post-processing device for 3D printed objects according to any one of the above embodiments; the post-processing device is independently arranged or integrally arranged with the 3D printer.

[0155] It should be noted that the post-processing device can be integrated in the 3D printer, and after the 3D printing is completed, the 3D printed object 1 is moved to the receiving mechanism 2 by the automatic shoveling mechanism, and then the dripping is performed, so that the automatic shoveling and automatic dripping can be realized, and the labor cost is greatly saved. Of course, the post-processing device can also be independently arranged, and the application does not limit this.

[0156] From the above description, it can be seen that the above embodiments of the application achieve the following technical effects:

[0157] (1) In the embodiments of the application, the dripping position of the 3D printed object 1 is changed, so that the inclination angle of the 3D printed object 1 can be changed. By adjusting the dripping angle, the entire dripping process is not fixed at a single dripping position, which can better separate the excess resin material on the 3D printed object, and improve the efficiency of separating the excess resin.

[0158] (2) In the embodiments of the application, it is suitable for special structures such as inverted cup mouth structure and recessed structure, and can achieve better resin separation effect, reduce solvent consumption and cleaning time in later cleaning. In some application scenarios, the 3D printed object 1 can be directly solidified after dripping, and the application does not limit this.

[0159] (3) In the embodiments of the application, by dynamically controlling the temperature, the viscosity of the excess resin material can be reduced, the separation efficiency of the excess printing material 6 can be improved, and the deformation of the 3D printed object 1 caused by high temperature can be avoided, and different printing materials can also be adapted. In some embodiments, the regional temperature is controlled by heated gas, so that the temperature distribution of the region where the 3D printed object 1 is located is uniform, the efficiency of resin separation is improved, and the deformation of the object caused by high temperature in some regions is avoided.

[0160] (4) In the embodiments of the application, the excess resin material is recycled by the material recycling mechanism 5, and the recycled resin material can be used in subsequent 3D printing, so as to avoid waste of materials and save printing cost. In some embodiments, the material recycling mechanism 5 comprises a first container 52 and a second container 53, the first container 52 is in communication with the second container 53, and the second container 53 is arranged on the side away from the temperature adjusting mechanism 4. The second container 53 is away from the heating area formed by the temperature adjusting mechanism 4, so as to avoid that the recycled resin is exposed to the heating area for a long time, and avoid that the high temperature affects the performance of the recycled resin.

[0161] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0162] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless specifically so stated. It is to be understood that the drawings are not necessarily to scale of the various parts of the device shown therein. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail in order to avoid obscuring the present application. In each instance, the techniques, methods, and devices known to those of ordinary skill in the relevant art are deemed to be incorporated by reference. In all examples shown and discussed herein, any specific value is to be interpreted as illustrative only and not as a limitation. Thus, other examples of the example embodiments can have different values. It is noted that like references and designations can indicate like items in the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0163] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. The orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0164] For purposes of the description hereinafter, the orientations in the various figures will be described, as it is for example purposes only, as is conventional, with the front of the device, or structure, being faced upwards and the rear thereof faced downwards. Other orientations will likewise, or conversely, apply as a matter of design choice, and as such, the spatially relative terms "front", "back", "under", "above", "upper", "lower", and the like, are intended to and do describe the perceived location in space as placed in the orientation described herein and the concepts of "front" and "back" are interchangeable when the device is inverted. Unless otherwise stated, the ordinal terms first, second, etc. are used loosely to differentiate between two individually discrete points, areas, regions, or components. Such ordinal terms indicate a preference as to the order or sequence of one structural or functional element over another. It is further to be understood that any term or use of a term in the description or claims (including a plural and / or a singular form) can be taken to include one as well as any other tangent, related, or similar forms or types thereof.

[0165] In addition, it should be pointed out that the use of the terms "first", "second" and the like in connection with various elements is merely intended for identification and does not in any way indicate or imply a special order or sequence of the elements. The terms "first", "second", etc. are therefore not intended to limit the scope of the present application.

[0166] The preferred embodiments herein disclosed are not intended to limit or restrict the scope of the application, for any such embodiments can vary and can be practiced or carried out in various ways. Accordingly, any modification, equivalent arrangement, or alternative embodiment coming within the spirit and scope of the present application may be used as a replacement for any part of this disclosure without departing from the scope of the present application.

Claims

1. A post-processing device for 3D printed objects, characterized in that, Comprising: a receiving mechanism for receiving a 3D printed object with excess printing material; a movable mechanism for changing a droplet position of the 3D printed object to cause the excess printing material to drip from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the droplet position; the receiving mechanism comprises a receiving body having an opening and a receiving cavity for accommodating the 3D printed object; further comprising a temperature adjusting mechanism for generating a dynamic temperature distribution and / or adjusting a temperature of an area where the 3D printed object is located based on a pre-configured temperature control strategy.

2. The apparatus of claim 1, wherein, the movable mechanism is further configured to: hold the 3D printed object at at least one droplet position for a preset time; or continuously switch the 3D printed object between a plurality of the droplet positions; or hold the 3D printed object at at least one droplet position for a preset time and continuously switch the 3D printed object between a plurality of the droplet positions.

3. The apparatus of claim 1, wherein, the movable mechanism is further configured to hold the 3D printed object at a droplet position where an opening part of an accumulated liquid area formed by a structure of the 3D printed object itself is downward for a preset time.

4. A post-processing device for 3D printed objects, characterized in that, Comprising: a receiving mechanism for receiving a 3D printed object with excess printing material; a movable mechanism for setting the 3D printed object at a first droplet position for a first time period to cause the excess printing material to drip from the 3D printed object; wherein an inclination angle of the 3D printed object in the first droplet position is determined based on a preset angle value and / or a shape feature of the 3D printed object; the receiving mechanism comprises a receiving body having an opening and a receiving cavity for accommodating the 3D printed object; further comprising a temperature adjusting mechanism for generating a dynamic temperature distribution and / or adjusting a temperature of an area where the 3D printed object is located based on a pre-configured temperature control strategy.

5. The apparatus of claim 4, wherein, the determination of the inclination angle in the first droplet position comprises: determining an optimal droplet angle based on a preset angle matching model and the shape feature of the 3D printed object; and obtaining the inclination angle of the 3D printed object in the first droplet position according to the optimal droplet angle.

6. The apparatus of claim 4, wherein, the first droplet position is a droplet position where an opening part of an accumulated liquid area formed by a structure of the 3D printed object itself is downward.

7. The apparatus of claim 1 or 4, wherein, the dynamic temperature distribution comprises at least controlling a temperature of an area where the 3D printed object is located to maintain at a first temperature for a first time period and to maintain at a second temperature for a second time period, the first temperature being greater than or less than the second temperature.

8. The apparatus of claim 1 or 4, wherein, the temperature control strategy comprises one or more of the following: controlling a temperature of an area where the 3D printed object is located to maintain in a preset temperature value range; or determining a temperature control parameter based on a material type and a pre-configured mapping relationship between material types and temperature control parameters. ​ 9. The apparatus of claim 1 or 4, wherein, The temperature adjusting mechanism adjusts the region temperature by one or more of the following: quartz heating tube, PTC heating source, infrared heating source, heated fluid, heated gas, heating plate or heat exchanger.

10. The apparatus of claim 1 or 4, wherein, The temperature adjusting mechanism comprises a heat source and an air outlet assembly, which are used to generate heated gas to place the 3D printed object in the heated gas.

11. The apparatus of claim 10, wherein, The air outlet assembly has a plurality of air outlets, and the air blowing area formed by the plurality of air outlets covers the 3D printed object; or The plurality of air outlets move to cover the 3D printed object with the air blowing area.

12. The apparatus of claim 11, wherein, The air outlet of the air outlet assembly is arranged above or beside the 3D printed object, and the heat source is arranged at the air outlet.

13. The apparatus of claim 1 or 4, wherein, Further comprising a temperature sensor for detecting the region temperature; wherein the working state of the temperature adjusting mechanism is controlled based on the detection data of the temperature sensor.

14. The apparatus of claim 1 or 4, wherein, Further comprising an air outlet mechanism for generating flowing gas to place the 3D printed object in the flowing gas to accelerate the flow of the excess printing material.

15. The apparatus of claim 1 or 4, wherein, Further comprising a vibration mechanism for vibrating the 3D printed object to accelerate the flow of the excess printing material.

16. The apparatus of claim 1 or 4, wherein, Further comprising a material recycling mechanism for collecting at least part of the excess printing material.

17. The apparatus of claim 16, wherein, The material recycling mechanism is provided with a filtering assembly.

18. The apparatus of claim 16, wherein, The material recycling mechanism comprises a first container and a second container, the first container is in communication with the second container, and the second container is arranged on the side away from the temperature adjusting mechanism.

19. The apparatus of claim 1 or 4, wherein, The movable mechanism comprises: a driving component; The material receiving mechanism is connected with the driving component to change the dripping position of the 3D printed object by the driving component.

20. The apparatus of claim 1 or 4, wherein, The movable mechanism comprises a poking member arranged in the material receiving mechanism, which is used to drive the 3D printed object to switch the dripping position.

21. The apparatus of claim 1 or 4, wherein, The movable mechanism comprises a grabbing member, which is used to enter the material receiving mechanism and grab the 3D printed object to drive the 3D printed object to switch the dripping position.

22. The device of claim 1 or 4, wherein The material receiving body has a liquid outlet in communication with the containing cavity.

23. The apparatus of claim 22, wherein, The material receiving mechanism comprises a net structure.

24. The apparatus of claim 22, wherein, The material receiving mechanism further comprises: a cover plate arranged opposite to the opening on the material receiving body to open or close the opening.

25. A post-processing method for 3D printed objects, characterized in that, The method comprises: using the material receiving mechanism to carry the 3D printed object with excess printing material; moving the material receiving mechanism to change the dripping position of the 3D printed object to make the excess printing material drip from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the dripping position; wherein the material receiving mechanism comprises a material receiving body having an opening and a containing cavity for containing the 3D printed object; using a temperature regulation mechanism to generate a dynamic temperature distribution and / or based on a pre-configured temperature control strategy to regulate the temperature of the area where the 3D printed object is located.

26. The method of claim 25, wherein, Further comprising: maintaining the 3D printed object at the at least one droplet position for a preset time; or continuously switching the 3D printed object between a plurality of the droplet positions; or maintaining the 3D printed object at the at least one droplet position for a preset time and continuously switching the 3D printed object between a plurality of the droplet positions. Further comprising:

27. The method of claim 25, wherein, maintaining the 3D printed object at a droplet position where an open part of the liquid accumulation area points downwards for a preset time; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself. Comprising:

28. A post-processing method for 3D printed objects, characterized in that, using a receiving mechanism to carry the 3D printed object with excess printing material; moving the receiving mechanism to place the 3D printed object at a first droplet position in a first time period to make the excess printing material drip from the 3D printed object; wherein the inclination angle of the 3D printed object in the first droplet position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object; wherein the receiving mechanism comprises a receiving body having an opening and a receiving cavity for accommodating the 3D printed object; using a temperature regulation mechanism to generate a dynamic temperature distribution and / or based on a pre-configured temperature control strategy to regulate the temperature of the area where the 3D printed object is located. The determination process of the inclination angle in the first droplet position comprises: determining an optimal droplet angle based on a preset angle matching model and the shape characteristics of the 3D printed object; and obtaining the inclination angle of the 3D printed object in the first droplet position according to the optimal droplet angle.

29. The method of claim 28, wherein, The first droplet position is a droplet position where an open part of the liquid accumulation area points downwards; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

30. The method of claim 28, wherein, The dynamic temperature distribution comprises at least controlling the temperature of the area where the 3D printed object is located to maintain at a first temperature in a first time period, and at least controlling the temperature of the area where the 3D printed object is located to maintain at a second temperature in a second time period, the first temperature being greater than or less than the second temperature.

31. The method of claim 25 or 28, wherein, The temperature control strategy comprises one or more of the following:

32. The method of claim 25 or 28, wherein, controlling the temperature of the area where the 3D printed object is located to maintain in a preset temperature value range; or determining a temperature control parameter based on the material type and a pre-configured mapping relationship between material types and temperature control parameters. Further comprising:

33. The method of claim 25 or 28, wherein, regulating the area temperature by one or more of the following: quartz heating tube, PTC heating source, infrared heating source, heated fluid, heated gas, heating plate or heat exchanger. Further comprising:

34. The method of claim 25 or 28, wherein, applying heated gas to make the 3D printed object be in the heated gas. Further comprising:

35. The method of claim 25 or 28, wherein, obtaining temperature detection data; and controlling the working state of the temperature regulation mechanism based on the temperature detection data. Further comprising:

36. The method of claim 25 or 28, wherein, applying flowing gas to make the 3D printed object be in the flowing gas to accelerate the flow of the excess printing material. Further comprising:

37. The method of claim 25 or 28, wherein, making the 3D printed object vibrate to accelerate the flow of the excess printing material. Further comprising:

38. The method of claim 25 or 28, wherein, ​ collecting at least a portion of the excess printing material.

39. The method of claim 38, wherein, Further comprising: filtering the collected excess printing material.

40. The method of claim 38, wherein, Further comprising: reusing the filtered excess printing material in a subsequent 3D printing; or mixing the filtered excess printing material with new printing material for reusing the mixed printing material in a subsequent 3D printing.

41. A 3D printing system, characterized by A 3D printing machine and a post-processing device for a 3D printed object as claimed in any one of claims 1-24; the post-processing device being provided independently or integrally with the 3D printing machine.

42. A method of 3D printing, comprising: Comprising: exposing the printing material to light to cause the printing material to polymerize into a 3D printed object; processing the 3D printed object using a post-processing method for a 3D printed object as claimed in any one of claims 25-40.

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