Post-processing device for 3D printing object and 3D printing system and method

Abstract

The invention provides a post-processing device for a 3D printing object and a 3D printing system and method.The post-processing device comprises a material receiving mechanism used for bearing the 3D printing object with redundant printing materials; the movable mechanism is used for changing the liquid dropping position of the 3D printing object, so that the redundant printing material drops from the 3D printing object; wherein the 3D printing object has at least two different inclination angles in the liquid dropping position changing process. According to the device, the liquid dropping position of the 3D printing object is changed, the inclination angle of the 3D printing object can be changed, accordingly, redundant resin materials on the 3D printing object are separated, and the efficiency of separating redundant resin is improved.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing technology, and in particular to a post-processing device, a 3D printing system and a method for 3D printing objects. Background Art

[0002] 3D printing technology is to manufacture three-dimensional entities by layering through 3D printing equipment based on the three-dimensional model data of the object. 3D printing technology can overcome special structural obstacles that cannot be achieved by traditional mechanical processing and realize the simplified production of any complex structural parts. Current 3D printing technologies include laser stereolithography (SLA), digital light processing (DLP), liquid crystal display technology (LCD), fused deposition modeling (FDM), selective laser sintering (SLS), etc.

[0003] After 3D printing is completed, due to the properties of the printing material itself, such as the certain viscosity of the resin material, 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 a method of placing the printed part on the platform for a period of time after printing is completed before taking it out, so as to facilitate the resin to flow back to the material tray.

[0004] However, due to the different shapes of 3D printed objects, the above-mentioned method of separating excess printing materials in the prior art has poor separation effect and low efficiency. Summary of the invention

[0005] The main purpose of the present invention is to provide a post-processing device, a 3D printing system and a method for 3D printed objects, so as to solve the problem that the separation effect of excess printing material in the prior art is poor and the efficiency is low.

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

[0007] A material receiving mechanism, used for carrying a 3D printed object with excess printing material;

[0008] A movable mechanism is used to change the dripping position of the 3D printed object so that the excess printing material drips from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the dripping position.

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

[0010] Maintaining the 3D printed object at at least one dripping position for a preset time; or

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

[0012] The 3D printed object is maintained at at least one dripping position for a preset time and is continuously switched between a plurality of the dripping positions.

[0013] As an optional example, the movable mechanism is also used to: maintain the downward dripping position of the opening part of the 3D printed object in the liquid accumulation area for a preset time; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0014] According to another aspect of an embodiment of the present invention, there is provided a post-processing device for 3D printing an object, comprising:

[0015] A material receiving mechanism, used for carrying a 3D printed object with excess printing material;

[0016] A movable mechanism is used to set the 3D printed object at a first dripping position in a first time period so that the excess printing material drips 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 a shape feature of the 3D printed object.

[0017] As an optional example, the process of determining the inclination angle in the first drip position includes: determining the optimal drip 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 drip position according to the optimal drip angle.

[0018] As an optional example, the first dripping position is a dripping position where the opening part of the liquid accumulation area is downward; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0019] As an optional example, the above-mentioned device also includes: a temperature regulating mechanism, which is used to generate a dynamic temperature distribution and / or regulate the temperature of the area where the 3D printed object is located based on a preconfigured temperature control strategy.

[0020] As an optional example, the dynamic temperature distribution includes controlling the temperature of the area where the 3D printed object is located to be maintained at a first temperature at least in a first time period, and controlling the temperature of the area where the 3D printed object is located to be maintained at a second temperature at least in a second time period, wherein the first temperature is greater than or less than the second temperature.

[0021] As an optional example, the temperature control strategy includes one or more of the following: controlling the temperature of the area where the 3D printed object is located to maintain within a preset temperature value range; or determining the temperature control parameters based on the material type and a pre-configured mapping relationship between the material type and the temperature control parameters.

[0022] As an optional example, the temperature regulating mechanism regulates the temperature of the zone 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 regulating mechanism includes a heat source and an air outlet component, and the heat source and the air outlet component are used to generate heated gas so that the 3D printed object is placed in the heated gas.

[0024] As an optional example, the air outlet assembly has a plurality of air outlets, and a wind blowing area formed by the plurality of air outlets covers the 3D printed object; or the plurality of air outlets are moved so that a wind blowing area covers the 3D printed object.

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

[0026] As an optional example, the above-mentioned device also includes a temperature sensor, and the temperature sensor is used to detect the temperature of the area; 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-mentioned device also includes an air outlet mechanism, which is used to generate flowing gas so that the 3D printed object is placed in the flowing gas to accelerate the flow of the excess printing material.

[0028] As an optional example, the above-mentioned device also includes a vibration mechanism, and the vibration mechanism is used to make the 3D printed object vibrate to accelerate the flow of the excess printing material.

[0029] As an optional example, the above-mentioned device also includes a material recovery mechanism, and the material recovery mechanism is used to collect at least a part of the excess printing material.

[0030] As an optional example, a filtering component is provided in the material recovery mechanism.

[0031] As an optional example, the material recovery mechanism includes a first container and a second container, the first container is connected to the second container, and the second container is arranged on a side away from the temperature adjustment mechanism.

[0032] As an optional example, the movable mechanism includes: a driving component; the material receiving mechanism is connected to the driving component, so that the driving component drives the material receiving mechanism and the dripping position of the 3D printed object to change.

[0033] As an optional example, the movable mechanism includes a toggle member disposed in the material receiving mechanism, and the toggle member is used to drive the 3D printed object to switch the dripping position.

[0034] As an optional example, the movable mechanism includes 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.

[0035] As an optional example, the material receiving mechanism includes: a material receiving body, the material receiving body having an opening, a liquid outlet and a accommodating cavity for accommodating the printed part, the opening being communicated with the accommodating cavity, and the liquid outlet being communicated with the accommodating cavity.

[0036] As an optional example, the material receiving mechanism includes a net bag structure.

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

[0038] According to another aspect of an embodiment of the present invention, there is provided a post-processing method for a 3D printed object, comprising: carrying a 3D printed object having excess printing material; changing a dripping position of the 3D printed object so that the excess printing material drips from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the dripping position.

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

[0040] Maintaining the 3D printed object at at least one dripping position for a preset time; or

[0041] Continuously switching the 3D printed object between a plurality of the dripping positions; or

[0042] The 3D printed object is maintained at at least one dripping position for a preset time and is continuously switched between a plurality of the dripping positions.

[0043] As an optional example, the method further includes: maintaining the dripping position of the 3D printed object at the opening portion of the liquid accumulation area downward for a preset time; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0044] According to another aspect of an embodiment of the present invention, a post-processing method for a 3D printed object is provided, comprising:

[0045] Carrying 3D printed objects with excess printing material;

[0046] The 3D printed object is set at a first dripping position in a first time period so that the excess printing material drips 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 a shape feature of the 3D printed object.

[0047] As an optional example, the process of determining the inclination angle in the first drip position includes: determining the optimal drip 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 drip position according to the optimal drip angle.

[0048] As an optional example, the first dripping position is a dripping position where the opening part of the liquid accumulation area is downward; 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 includes: 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 includes controlling the temperature of the area where the 3D printed object is located to be maintained at a first temperature at least in a first time period, and controlling the temperature of the area where the 3D printed object is located to be maintained at a second temperature at least in a second time period, wherein the first temperature is greater than or less than the second temperature.

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

[0052] Controlling the temperature of the area where the 3D printed object is located to maintain within a preset temperature value range; or

[0053] The temperature control parameters are determined based on the material type and a pre-configured mapping relationship between the material type and the temperature control parameters.

[0054] As an optional example, the method further includes: adjusting the temperature of the area 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.

[0055] As an optional example, the method further includes: applying heated gas so that the 3D printed object is in the heated gas.

[0056] As an optional example, the above method further includes: acquiring temperature detection data; and controlling the working state of the temperature regulating mechanism based on the temperature detection data.

[0057] As an optional example, the method further includes: applying flowing gas so that the 3D printed object is placed in the flowing gas to accelerate the flow of the excess printing material.

[0058] As an optional example, the method further includes: causing the 3D printed object to vibrate to accelerate the flow of the excess printing material.

[0059] As an optional example, the above method further includes: collecting at least a portion of the excess printing material.

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

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

[0062] According to another aspect of an embodiment of the present invention, a 3D printing system is provided, comprising a 3D printer and a post-processing device for 3D printing an object as described in any one of the above contents; the post-processing device is independently arranged or integrated with the 3D printer.

[0063] According to another aspect of an embodiment of the present invention, a 3D printing method is also provided, comprising: exposing a printing material to polymerize the printing material to form a 3D printed object; and processing the 3D printed object using a post-processing method for 3D printed objects as described in any one of the above contents.

[0064] In the present invention, the dripping position of the 3D printed object is changed, and the tilt angle of the 3D printed object 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. At the same time, the device provided by the present invention can achieve a better resin separation effect, reduce the solvent consumption and cleaning time during the later cleaning, and can also recycle the separated resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0066] Figure 1 is a front view of a post-processing device for 3D printed objects provided by an embodiment of the present invention;

[0067] Figure 2 It is a right view of the material receiving mechanism and the 3D printed object provided by the embodiment of the present invention;

[0068] Figure 3 It is a schematic diagram of the structure of a 3D printed object;

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

[0070] Figure 5 is a front view of another post-processing device for 3D printing objects provided by an embodiment of the present invention;

[0071] Figure 6 is a front view of a movable mechanism provided by an embodiment of the present invention;

[0072] Figure 7 is a front view of another movable mechanism provided by an embodiment of the present invention;

[0073] Figure 8 is a front view of another movable mechanism provided by an embodiment of the present invention;

[0074] Fig. 9 is a front view of another movable mechanism provided by an embodiment of the present invention;

[0075] Fig.10 It is a structural schematic diagram of a material receiving mechanism provided by an embodiment of the present invention;

[0076] Fig.11 is a front view of a post-processing device for 3D printed objects provided by an embodiment of the present invention;

[0077] Fig.12 is a schematic diagram of dynamic temperature distribution provided by an embodiment of the present invention;

[0078] Fig.13 is a front view of a post-processing device for 3D printed objects provided by an embodiment of the present invention;

[0079] Fig.14 is a front view of a post-processing device for 3D printed objects provided by an embodiment of the present invention;

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

[0081] Fig.16 It is a schematic diagram of centrifugal force.

[0082] The above drawings 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. Accommodating chamber; 22. Cover plate; 3. Movable mechanism; 31. Driving component; 32. Toggle member; 33. Guide part; 34. Track; 35. Grabbing member; 4. Temperature regulating mechanism; 41. Air outlet component; 42. Heat source; 43. Guide rail; 44. Temperature sensor; 5. Material recovery mechanism; 51. Filter component; 52. First container; 53. Second container; 6. Excess printing material. DETAILED DESCRIPTION

[0084] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0085] like Figure 1 , Figure 2 As shown, the present invention provides a post-processing device for 3D printed objects, comprising: a material receiving mechanism 2, used to carry a 3D printed object 1 with excess printing material 6; a movable mechanism 3, used to change the dripping position of the 3D printed object 1, so that the excess printing material 6 drips from the 3D printed object 1; wherein, the 3D printed object 1 has at least two different tilt angles during the change of the dripping position. In the present invention, the excess printing material 6 drips from the 3D printed object 1 mainly by gravity or the combined force of gravity and other forces (such as wind force, vibration force, etc.), and gravity or the combined force of gravity and other forces drives the excess printing material 6 to leave 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 uncured polymer resin. After the 3D printing is completed, due to the properties of the printing material itself, such as the resin material having a certain viscosity, 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, it is in a fixed position during the molding process, and there will be more liquid accumulation areas on the 3D printed object 1, such as an inverted cup mouth structure, a C-shaped dental mold, a hollow dental mold, etc., and uncured resin materials are likely to exist in these liquid accumulation areas. The presence of these resins will not only cause a large amount of material loss, but also increase the difficulty of subsequent processing, so it is necessary to separate these excess resins from the 3D printed object 1.

[0087] In an embodiment of the present invention, the dripping position of the 3D printed object 1 is changed, and the inclination angle of the 3D printed object 1 can be changed, so that the excess printing material 6 drips from the 3D printed object 1. By adjusting the dripping angle, the entire dripping process is not fixed at a single dripping position, so that the excess resin material on the 3D printed object 1 can be better separated, and the efficiency of separating the excess resin is improved. At the same time, through the device provided by the present invention, 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 also be recycled. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, and the present invention does not limit this.

[0088] like Figure 2 (a) Figure 2 (b) and Figure 2 As shown in (c), the 3D printed object 1 is arranged in the material receiving mechanism 2, and the 3D printed object 1 changes position with the material receiving mechanism 2. The figure shows three different dripping positions of the material receiving mechanism 2 and the 3D printed object 1, which are recorded as dripping position a, dripping position b, and dripping position c. It can be understood that the material receiving mechanism 2 and the 3D printed object 1 have different inclination angles in different dripping positions. Among them, the inclination angle represents the 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 material receiving mechanism 2. Exemplarily, the dripping position can be customized based on user needs, for example, the dripping position corresponds to the inclination angle one by one, and the inclination angle changes once each time the dripping position is changed; or the two are set separately, and the inclination angle changes multiple times each time the dripping position is changed. In a specific application, the dripping position of the 3D printed object 1 is changed by changing the tilt angle multiple times, which is beneficial to separating the excess resin material on different surfaces and liquid accumulation areas of the 3D printed object 1.

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

[0090] It can be understood that the movable mechanism 3 in the present invention is used to control the dripping position of the 3D printed object 1. After changing the dripping position, the 3D printed object 1 can also be kept at any dripping position, that is, the entire dripping process is not fixed at a single dripping position. Exemplarily, the preset times for different dripping positions can be set to be the same or different, for example, after the 3D printed object 1 is maintained at the dripping position a for 1 minute, the 3D printed object 1 is changed to the dripping position b at an arbitrary speed and maintained for 3 minutes, and then the 3D printed object 1 is changed to the dripping position c and maintained for 1 minute; the 3D printed object 1 can also be continuously switched between the dripping positions a, b, and c, for example, the 3D printed object 1 is continuously switched according to abca or acbca; the 3D printed object 1 can also be continuously switched between the dripping positions a and c and maintained at the dripping position b for t time, for example, the 3D printed object 1 is continuously switched between the dripping positions a and c at an arbitrary speed according to acca within the time period t1-t2, and then the 3D printed object 1 is changed to the dripping position b at time t2, and then maintained for t time.

[0091] Reference Figure 3 In one embodiment, the movable mechanism 3 is further used to maintain the dripping position of the 3D printed object 1 at the opening of the liquid accumulation area 11 downward for a preset time; wherein the liquid accumulation area 11 is formed by the structure of the 3D printed object 1 itself. In a specific application, if the 3D printed object 1 has a liquid accumulation area 11 caused by a special structure, such as an inverted cup mouth structure, the dripping position of the cup mouth part of the inverted cup mouth structure downward can be recorded as the dripping position b, and then the dripping is performed by staying at the dripping position b for t time and continuously switching to other positions, which can further improve the efficiency of separating excess resin materials.

[0092] like Figure 4 As shown, the method of cleaning excess resin by centrifugation in the prior art is demonstrated. The rotation of the rotor generates a centrifugal force that drives the excess printing material away from the center of rotation and away from the surface of the object. During the centrifugation process, the inclination angle of the 3D printed object 1 does not change. Figure 3 , Figure 4It can be seen that for some 3D printed objects 1 with special structures, such as an inverted cup mouth structure, a C-shaped dental mold, a hollow dental mold, etc., there will be some liquid accumulation areas 11. When the resin is thrown off by centrifugation, if the opening in the liquid accumulation area 11 is small or the opening is not set downward, the resin in the liquid accumulation area 11 is not easy to fall out. Therefore, the centrifugal method cannot clean the above-mentioned liquid accumulation area 11 very well, which may easily lead to the resin material in the liquid accumulation area not being thrown off, and the effect of centrifugal cleaning is not good. In addition, the speed and time of centrifugal cleaning are not easy to control. For objects with fragile structures, they are easily damaged by long-term centrifugal force. Excessive centrifugal force will cause the equipment to vibrate and make excessive noise, the equipment will be unstable, and the resin will splash and be difficult to collect. Fig.16 As shown, the direction of the centrifugal force during the centrifugal process is along the tangent direction, and the resin material will fly out along the tangent due to the centrifugal force.

[0093] By using the device of the present invention, the dripping angle is adjusted so that the entire dripping process is not fixed at a single dripping position. The excess printing material is mainly dripped from the 3D printed object by gravity or the combined force of gravity and other forces (such as wind force, vibration force, etc.), which can better separate the excess resin material on the 3D printed object 1, improve the efficiency of separating the excess resin, and will not cause damage to the 3D printed object. In the process of the resin material dripping, the resin material can fall vertically, and can also fall in a parabola under the action of wind, similar to the process of rain, and the resin material will not fly out.

[0094] In one embodiment, the movable mechanism 3 includes: a driving component 31; the material receiving mechanism 2 is connected to the driving component 31, so that the driving component 31 drives the material receiving mechanism 2 and the dripping position of the 3D printed object 1 to change.

[0095] Specifically, the driving component 31 includes a rotating shaft, such as a rotating shaft of a motor, and the rotating shaft of the motor is connected to the material receiving mechanism 2. The motor drives the 3D printed object 1 to rotate along the A axis to achieve a change in the dripping position of the 3D printed object 1, such as Figure 1 In some embodiments, the motor drives the 3D printed object 1 to rotate along point B to achieve the change of the dripping position of the 3D printed object 1, such as Figure 5 As shown. Among them, the rotation speed of the motor shaft can be set to a slow speed, that is, much less than the rotation speed of the centrifugal device, such as 50r / min or less than 50r / min or less, such as 5r / min, 10r / min, 15r / min, 20r / min, 30r / min, etc. During the rotation process, the excess resin material is mainly dripped by gravity, and the centrifugal force is basically not used. Of course, the rotation speed can also be set to more than 50r / min according to demand, and the excess resin material is dripped by the combined force of gravity and slight centrifugal force. The present invention does not limit the rotation speed.

[0096] It should be noted that in this embodiment, the rotation axis of the driving component 31 is configured to be non-parallel to the vertical direction (gravity direction). Optionally, the rotation axis of the driving component 31 is perpendicular to the vertical direction (gravity direction), which can change the dripping position of the 3D printed object 1, that is, the inclination angle relative to the vertical direction changes. The excess resin material in the present invention is mainly separated by gravity, and the structure is simpler and the separation efficiency is higher.

[0097] Reference Figure 6 In one embodiment, the movable mechanism 3 includes a toggle member 32 disposed in the material receiving mechanism 2, and the toggle member 32 is used to drive the 3D printed object 1 to switch the dripping position. Exemplarily, the toggle member 32 is connected to a track 34 and a driving member (not shown in the figure), and the driving member can drive the toggle member 32 to move along the track 34, such as Figure 6 In the process of moving the toggle member 32, the toggle member 32 contacts the 3D printed object 1 and toggle the 3D printed object 1, so that the 3D printed object 1 is tilted, that is, the dripping 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 this embodiment can remain unchanged.

[0098] Furthermore, if Figure 7 As shown, a guide portion 33 is provided on a side away from the toggle member 32 in the material receiving mechanism 2. During the movement of the toggle member 32, the toggle member 32 contacts the 3D printed object 1 and pushes the 3D printed object 1 to move onto the guide portion 33, so that the 3D printed object 1 is tilted, that is, the dripping position of the 3D printed object 1 changes, so as to separate the excess printing material 6 from the 3D printed object 1. In a specific application, the 3D printed object 1 can be kept at any dripping position for a preset time t by the toggle member 32. Among them, the driving member can be set as a telescopic structure, such as a cylinder, etc., which can realize the up and down movement of the toggle member 32. After the 3D printed object 1 is toggled to the leftmost side, the toggle member 32 is retracted, and then the toggle member 32 is moved to the leftmost side, and the 3D printed object 1 can be moved to the initial position by moving the toggle member 32 to the right.

[0099] Furthermore, if Figure 8 As shown, guide parts 33 are provided on both sides of the material receiving mechanism 2, and two toggle members 32 are provided. By moving the two toggle members 32 left and right, the 3D printed object 1 can be continuously switched between several dripping positions to separate the excess printing material 6 from the 3D printed object 1.

[0100] Reference Fig. 9In one embodiment, the movable mechanism 3 includes a gripping member 35, and the gripping member 35 is used to enter the material receiving mechanism 2 and grab the 3D printed object 1 to drive the 3D printed object 1 to switch the dripping position. Exemplarily, the gripping member 35 is connected to a track 34 and a driving member (not shown in the figure), and the driving member can drive the toggle member 32 to move along the track 34 and move up and down in the vertical direction. For example, the gripping member 35 adopts a manipulator, and after grabbing the 3D printed object 1 and putting it down, the inclination angle of the 3D printed object 1 can be changed, that is, the dripping position of the 3D printed object 1 is changed, so as to separate the excess printing material 6 from the 3D printed object 1.

[0101] Reference Fig.10 The material receiving mechanism 2 includes a material receiving body 21, and the material receiving body 21 has an opening 210, a liquid outlet 211 and a accommodating chamber 212 for accommodating a printed part, the opening 210 is connected to the accommodating chamber 212, and the liquid outlet 211 is connected to the accommodating chamber 212. One or more 3D printed objects 1 are placed in the accommodating chamber 212, and the excess resin material can be separated individually or in large quantities at the same time. Furthermore, the material receiving mechanism 2 also includes a cover plate 22, which is arranged opposite to the opening 210, and the cover plate 22 is arranged on the material receiving body 21 to open or close the opening 210. The cover plate 22 can be connected to the material receiving body 21 by magnetic attraction or snap-on, which is not limited in the present invention.

[0102] It is understandable that, when the cover plate 22 is added, the cover plate 22 prevents the 3D printed object 1 from falling out of the material receiving mechanism 2 during the rotation process, thereby increasing the tilt angle range of the 3D printed object 1. Exemplarily, the material receiving mechanism 2 includes a net bag structure, the net bag can be made of metal material, the top of the net bag has an opening 210 and a cover plate 22, and the bottom and side walls of the net bag have multiple liquid outlets 211.

[0103] Reference Fig.11 In some embodiments, the post-processing device further includes a temperature regulating mechanism 4, which is used to generate a dynamic temperature distribution and / or to regulate the temperature of the region where the 3D printed object 1 is located based on a preconfigured temperature control strategy. Specifically, the temperature regulating mechanism 4 regulates the regional temperature through 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.

[0104] Specifically, the dynamic temperature distribution includes controlling the temperature of the area where the 3D printed object 1 is located to be maintained at a first temperature at least in a first time period, and controlling the temperature of the area where the 3D printed object 1 is located to be maintained at a second temperature at least in a second time period, and the first temperature is 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 that has not undergone a curing process and is easily deformed if exposed to a high temperature environment for a long time. Through dynamic temperature control, the viscosity of the excess resin material can be reduced, while preventing the 3D printed object 1 from being deformed due to excessive temperature. For example, Fig.12 As shown in (a), the temperature of the control area is first high and then low, and 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, after t1, the temperature is reduced to avoid long-term heating causing excessive temperature and deformation of the 3D printed object 1; or Fig.12 As shown in (b), if the surface of the 3D printed object 1 is adhered to a lot of resin when it leaves the printing area, since the resin flows faster under the action of force when there is a lot of resin, a low temperature can be used in the time period 0-t1, and then the temperature of the area can be increased in the time period t1-t2 to reduce the viscosity of the resin material, and then the temperature can be lowered after t2 to avoid long-term heating. Fig.12 The regional temperatures in (a) and 12(b) represent the temperature setting values. Since the time of temperature change depends on the power of the heater / cooler, the process time of heating or cooling is not shown in the figure. The figure is an example of the set temperature. In specific applications, the heating 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 within a preset temperature value range; or determining the temperature control parameters based on the material type and the pre-configured mapping relationship between the material type and the temperature control parameters.

[0107] For example, Fig.12 As shown in (c), for some 3D printed objects 1 that are not easy to deform or have low precision requirements, the temperature of the area where the 3D printed object 1 is located can be controlled to maintain a preset temperature value range during the entire dripping process to improve the efficiency of separating excess resin materials. In some embodiments, a database can also be established based on the mapping relationship between the printing material type and the temperature control parameter, and different temperature control parameters can be configured for different printing materials. The temperature control parameters include one or more of the heating start time, heating end time, heating duration, temperature setting value, heat dissipation or cooling time. For example, for materials with high viscosity, the following method can be used: Fig.12 (c) Full temperature control method.

[0108] In one embodiment, the post-processing device further includes a temperature sensor 44, which is used to detect the regional temperature or the ambient temperature; wherein the working state of the temperature regulating 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, such as Fig.13As shown. By detecting the regional temperature through the sensor, the temperature can be adjusted in real time for more accurate control of the regional temperature.

[0109] Reference Fig.13 , Fig.14 The temperature regulating mechanism 4 includes a heat source 42 and an air outlet component 41, and the heat source 42 and the air outlet component 41 are used to generate heated gas so that the 3D printed object 1 is in the heated gas. Among them, the air outlet component 41 has a plurality of air outlets, and the wind blowing area formed by the plurality of air outlets covers the 3D printed object 1; or the plurality of air outlets are moved so that the wind blowing area covers the 3D printed object 1. Exemplarily, the air outlet of the air outlet component 41 is arranged above the 3D printed object 1, and the heat source 42 is arranged at the air outlet. The air outlet component 41 includes a fan, a guide rail 43 and a driving member, and the driving member can drive the fan to move along the direction of the guide rail 43 so that the wind blowing area of ​​the fan covers the entire 3D printed object 1, such as Fig.13 Alternatively, multiple fans or fans with multiple air outlets are provided, in which case the wind blowing area of ​​the fans can completely cover the 3D printed object 1, and there is no need to move the fans. For example, two fans are provided to overlap and cover the 3D printed object 1, as shown in FIG. Fig.14 As shown. It can be understood that in the present invention, the temperature of the region is controlled by heated gas, so that the temperature distribution of the region where the 3D printed object 1 is located can be uniform, the efficiency of resin separation is improved, and at the same time, deformation of the object caused by excessive temperature in some regions is avoided. In other embodiments, the air outlet of the air outlet component 41 can also be arranged on the side of the 3D printed object 1, and the heat source 42 can also be arranged on the side of the 3D printed object 1, and the present invention does not limit this.

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

[0111] In another embodiment, the post-processing device further includes a vibration mechanism, which is used to vibrate the 3D printed object 1 to accelerate the flow of 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 flow of the resin material is accelerated by the vibration force to improve the separation efficiency.

[0112] In some embodiments, Fig.13 , Fig.14As shown, the post-processing device further includes a material recovery mechanism 5, which is used to collect at least a portion of the excess printing material 6. When the 3D printed object 1 leaves the printing area, a large amount of resin material will be taken out. By setting up the material recovery mechanism 5 to recover the excess resin material, the recovered resin material can be used in subsequent 3D printing, thereby avoiding material waste and saving printing costs.

[0113] Furthermore, if Fig.15 As shown, a filter component 51 is provided in the material recovery mechanism 5. It should be noted that the surface of the 3D printed object 1 may be adhered with residue particles. The filter component 51 can be a filter screen, which is arranged at the opening of the material recovery mechanism 5, and can filter the residue to prevent the recovered resin from containing residue and affecting the subsequent printing effect. The excess printing material 6 after filtration can be directly reused in subsequent 3D printing, or the excess printing material 6 after filtration can be mixed with new printing material to reuse the mixed printing material in subsequent 3D printing.

[0114] Furthermore, if Fig.15 As shown, the material recovery mechanism 5 includes a first container 52 and a second container 53, and the first container 52 and the second container 53 are used to contain the collected excess printing material 6. The first container 52 is connected to the second container 53, and the second container 53 is arranged on a side away from the temperature regulating 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 regulating mechanism 4, while the second container 53 is away from the heating area formed by the temperature regulating mechanism 4, which can prevent the recycled resin from being exposed to the heating area for a long time, thereby preventing high temperature from affecting the performance of the recycled resin. In one embodiment, a guide portion is provided at the bottom of the first container 52, and the side of the guide portion away from the second container 53 is higher than the other side, so that the recycled resin material can flow into the second container 53 preferentially.

[0115] In another embodiment, a post-processing device for 3D printed objects includes a material receiving mechanism 2 for carrying a 3D printed object 1 with 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 adhering 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 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 2(a) The first dripping position. It should be noted that, for different 3D printed objects 1, the first dripping position may be different, and the movable mechanism 3 can make different 3D printed objects 1 be in different dripping positions. Exemplarily, for a certain type of 3D printed object 1, the preset angle value in the first dripping position is set based on an empirical value, such as 45°, that is, the inclination angle of the 3D printed object 1 is set at 45° for dripping.

[0117] Optionally, the process of determining the inclination angle in the first dripping position includes: determining the optimal dripping angle based on a preset angle matching model and the shape characteristics 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. Exemplarily, 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 dripping angle corresponding to the 3D printed object 1 is automatically identified through machine learning. Among them, the optimal dripping angle represents the angle that can make the dripping efficiency of the resin material in the 3D printed object 1 the highest or the amount of the resin material dripping the largest, such as the angle when the cup mouth in the inverted cup mouth structure faces downward.

[0118] Optionally, the first dripping position is a dripping position where the opening of the liquid accumulation area is downward; wherein 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, such as an inverted cup mouth structure, the dripping position where the cup mouth of the inverted cup mouth structure is downward can be recorded as the first dripping position, and then dripping is performed by staying at the first dripping position for t time, which can improve the efficiency of separating excess resin material.

[0119] In this embodiment, the above-mentioned device can also use the temperature adjustment mechanism 4, material recovery mechanism 5, air outlet mechanism, vibration mechanism, etc. as described above to separate the excess printing material 6. The implementation principle is the same as above and will not be repeated here.

[0120] The present invention also provides a post-processing method for 3D printed objects, comprising carrying a 3D printed object 1 having excess printing material 6; changing the dripping 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 at different dripping 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 uncured polymer resin. After the 3D printing is completed, due to the properties of the printing material itself, such as the resin material having a certain viscosity, 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, such as an inverted cup mouth structure, a C-shaped dental mold, a hollow dental mold, etc., uncured resin materials are easily present inside these structures. The presence of these resins will not only cause a large amount of material loss, but also increase the difficulty of subsequent processing, so it is necessary to separate these excess resins from the 3D printed object 1.

[0122] In an embodiment of the present invention, the inclination angle of the 3D printed object 1 is changed, so that the dripping position of the 3D printed object 1 can be changed. By dripping at multiple angles, the excess resin material on the 3D printed object 1 can be separated, thereby improving the efficiency of separating the excess resin. At the same time, the method provided by the present invention uses a non-single angle for dripping, which is suitable for special structures such as an inverted cup structure and a recessed structure, and can achieve a better resin separation effect, reduce the solvent consumption and cleaning time during the later cleaning, and can also recycle the separated resin. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, and the present invention does not limit this.

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

[0124] Furthermore, the method further includes: keeping the 3D printed object 1 at at least one dripping position for a preset time; or continuously switching the 3D printed object 1 between a plurality of dripping positions; or keeping the 3D printed object 1 at at least one dripping position for a preset time and continuously switching between a plurality of dripping positions. The preset time t may be 10s, 30s, 1min, 3min, 5min, etc., and the present invention does not limit this.

[0125] It is understandable that in the present invention, the dripping position of the 3D printed object 1 is controlled, and after the dripping position is changed, the 3D printed object 1 can also be kept at any dripping position, that is, the entire dripping layer is not fixed at a single dripping position. Exemplarily, the preset time of different dripping positions can be set to be the same or different. After the 3D printed object 1 is kept at the dripping position a for 1 minute, the 3D printed object 1 is changed to the dripping position b and kept for 3 minutes, and then the 3D printed object 1 is changed to the dripping position c and kept for 1 minute; the 3D printed object 1 can also be continuously switched between the dripping positions a, b, and c, for example, the 3D printed object 1 is continuously switched according to abca or acbca; the 3D printed object 1 can also be continuously switched between the dripping positions a and c and kept at the dripping position b for t time, for example, the 3D printed object 1 is continuously switched between the dripping positions a and c according to acca in the time period t1-t2, and then the 3D printed object 1 is changed to the dripping position b at time t2, and then kept for t time.

[0126] In specific applications, if the 3D printed object 1 has a special structure, such as an inverted cup-shaped structure or a concave structure, the dripping position of the cup-shaped structure with the cup-shaped portion downward can be recorded as the dripping position b, and then the dripping position b is stayed for t time and continuously switched to other positions to drip, which can further improve the efficiency of separating excess resin material.

[0127] In one embodiment, the method further includes: 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 includes controlling the temperature of the area where the 3D printed object 1 is located to be maintained at a first temperature at least in a first time period, and controlling the temperature of the area where the 3D printed object 1 is located to be maintained at a second temperature at least in a second time period, and the first temperature is 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 that has not undergone a curing process and is easily deformed if exposed to a high temperature environment for a long time. Through dynamic temperature control, the viscosity of the excess resin material can be reduced, while preventing the 3D printed object 1 from being deformed due to excessive temperature. For example, Fig.12 As shown in (a), the temperature of the control area is high first and then low. In the time period 0-t1, the temperature of the area is increased to reduce the viscosity of the resin material and improve the separation efficiency of the resin material. Then, after t1, the temperature is reduced to avoid long-term heating; or, as Fig.12 As shown in (b), if the surface of the 3D printed object 1 is adhered to a lot of resin when it leaves the printing area, since the resin flows faster under the action of force when there is a lot of resin, a low temperature can be used in the time period 0-t1, and then the temperature of the area can be increased in the time period t1-t2 to reduce the viscosity of the resin material, and then the temperature can be lowered after t2 to avoid long-term heating. Fig.12 The regional temperatures in (a) and 12(b) represent the temperature setting values. Since the time of temperature change depends on the power of the heater / cooler, the process time of heating or cooling is not shown in the figure. The figure is an example of the set temperature. In specific applications, the heating process can be slow.

[0130] Among them, 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 it within a preset temperature value range; or determining the temperature control parameters based on the material type and the pre-configured mapping relationship between the material type and the temperature control parameters.

[0131] For example, Fig.12 As shown in (c), for some 3D printed objects 1 that are not easy to deform or have low precision requirements, the temperature of the area where the 3D printed object 1 is located can be controlled to maintain a preset temperature value range during the entire dripping process to improve the efficiency of separating excess resin materials. In some embodiments, a database can also be established based on the mapping relationship between the printing material type and the temperature control parameter, and different temperature control parameters can be configured for different printing materials. The temperature control parameters include one or more of the heating start time, heating end time, heating duration, temperature setting value, heat dissipation or cooling time. For example, for materials with high viscosity, the following method can be used: Fig.12 (c) Full temperature control method.

[0132] Wherein, the method further comprises: adjusting the temperature of the zone 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.

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

[0134] Specifically, the temperature sensor 44 is used to detect the regional temperature or the ambient temperature; wherein the working state of the temperature regulating mechanism 4 is controlled based on the detection data of the temperature sensor 44. The temperature sensor 44 can be installed on the material connection structure 2 or near the heat source 42, such as Fig.13 As shown. By detecting the regional temperature through the sensor, the temperature can be adjusted in real time for more accurate control of the regional temperature.

[0135] In one embodiment, the method further comprises: applying heated gas so that the 3D printed object 1 is in the heated gas.

[0136] Reference Fig.13 , Fig.14 , a temperature regulating mechanism 4 is provided, including a heat source 42 and an air outlet component 41, the heat source 42 and the air outlet component 41 are used to generate heated gas so that the 3D printed object 1 is in the heated gas. Among them, the air outlet component 41 has a plurality of air outlets, and the wind blowing area formed by the plurality of air outlets covers the 3D printed object 1; or the plurality of air outlets are moved so that the wind blowing area covers the 3D printed object 1. Exemplarily, the air outlet of the air outlet component 41 is arranged above the 3D printed object 1, and the heat source 42 is arranged at the air outlet. The air outlet component 41 includes a fan, a guide rail 43 and a driving member, and the driving member can drive the fan to move along the direction of the guide rail 43 so that the wind blowing area of ​​the fan covers the entire 3D printed object 1, such as Fig.13 Alternatively, multiple fans or fans with multiple air outlets are provided, in which case the wind blowing area of ​​the fans can completely cover the 3D printed object 1, and there is no need to move the fans. For example, two fans are provided to overlap and cover the 3D printed object 1, as shown in FIG. Fig.14 As shown. It can be understood that in the present invention, the temperature of the region is controlled by heated gas, so that the temperature distribution of the region where the 3D printed object 1 is located can be uniform, the efficiency of resin separation is improved, and at the same time, deformation of the object caused by excessive temperature in some regions is avoided. In other embodiments, the air outlet of the air outlet component 41 can also be arranged on the side of the 3D printed object 1, and the heat source 42 can also be arranged on the side of the 3D printed object 1, and the present invention does not limit this.

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

[0138] Specifically, an air outlet mechanism is provided, which is used to generate flowing gas so that the 3D printed object 1 is placed 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 out compressed air, and the force generated by the high-pressure airflow is used to accelerate the flow of the resin material to improve the separation efficiency.

[0139] In one embodiment, the method further includes: vibrating the 3D printed object 1 to accelerate the flow of the excess printing material 6 .

[0140] Specifically, a vibration mechanism is provided, which is used to vibrate 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 flow of the resin material is accelerated by the vibration force to improve the separation efficiency.

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

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

[0143] Furthermore, the method further includes: 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, Fig.13 , Fig.14 As shown, a material recycling mechanism 5 is provided, and the material recycling mechanism 5 is used to collect at least a portion of the excess printing material 6. When the 3D printed object 1 leaves the printing area, a large amount of resin material will be taken out. By providing the material recycling mechanism 5 to recycle the excess resin material, the recycled resin material can be used in subsequent 3D printing, thereby avoiding material waste and saving printing costs.

[0145] Furthermore, if Fig.15 As shown, a filter component 51 is provided in the material recovery mechanism 5. It should be noted that the surface of the 3D printed object 1 may be adhered with residue particles. The filter component 51 can be a filter screen, which is arranged at the opening of the material recovery mechanism 5, and can filter the residue to prevent the recovered resin from containing residue and affecting the subsequent printing effect. The excess printing material 6 after filtration can be directly reused in subsequent 3D printing, or the excess printing material 6 after filtration can be mixed with new printing material to reuse the mixed printing material in subsequent 3D printing.

[0146] Furthermore, if Fig.15As shown, the material recovery mechanism 5 includes a first container 52 and a second container 53, and the first container 52 and the second container 53 are used to contain the collected excess printing material 6. The first container 52 is connected to the second container 53, and the second container 53 is arranged on a side away from the temperature regulating 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 regulating mechanism 4, while the second container 53 is away from the heating area formed by the temperature regulating mechanism 4, which can prevent the recycled resin from being exposed to the heating area for a long time, thereby preventing high temperature from affecting the performance of the recycled resin. In one embodiment, a guide portion is provided at the bottom of the first container 52, and the side of the guide portion away from the second container 53 is higher than the other side, so that the recycled resin material can flow into the second container 53 preferentially.

[0147] It should be noted that all process steps of a post-processing method for 3D printed objects provided in an embodiment of the present invention are implemented based on a post-processing device for 3D printed objects in the above-mentioned embodiment, and the working principles and beneficial effects of the two correspond one to one, so they are not repeated here.

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

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

[0150] The 3D printed object 1 is set at a first dripping position in a first time period to separate excess printing material 6 adhering 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.

[0151] In one embodiment, the process of determining the inclination angle in the first dripping position includes: determining the optimal dripping angle based on a preset angle matching model and the shape characteristics 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 one embodiment, the first dripping position is a dripping position of the opening portion of the liquid accumulation area downward; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0153] It should be noted that all process steps of a post-processing method for 3D printed objects provided in an embodiment of the present invention are implemented based on a post-processing device for 3D printed objects in the above-mentioned embodiment, and the working principles and beneficial effects of the two correspond one to one, so they are not repeated here.

[0154] The present invention also provides a 3D printing system, comprising a 3D printer and a post-processing device for 3D printing an object as described in any one of the above embodiments; the post-processing device is independently arranged or integrated with the 3D printer.

[0155] It should be noted that the post-processing device can be integrated into the 3D printer. After the 3D printing is completed, the 3D printed object 1 is moved to the material receiving mechanism 2 through the automatic shoveling mechanism, and then dripping is performed, which can realize automatic shoveling and automatic dripping, greatly saving labor costs. Of course, the post-processing device can also be set independently, and the present invention is not limited to this.

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

[0157] (1) In the embodiment of the present invention, the dripping position of the 3D printed object 1 is changed, so that the tilt 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 embodiment of the present invention, it is suitable for special structures such as an inverted cup structure and a concave structure, which can achieve a better resin separation effect and reduce the solvent consumption and cleaning time during the later cleaning. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, and the present invention does not limit this.

[0159] (3) In the embodiments of the present invention, dynamic temperature control can reduce the viscosity of excess resin material, improve the separation efficiency of excess printing material 6, avoid deformation of 3D printed object 1 caused by excessive temperature, and adapt to different printing materials. In some embodiments, the temperature of the region 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 deformation of the object caused by excessive temperature in some regions is avoided.

[0160] (4) In the embodiment of the present invention, the material recovery mechanism 5 is provided to recover the excess resin material, and the recovered resin material can be used in subsequent 3D printing, thereby avoiding waste of materials and saving printing costs. In some embodiments, the material recovery mechanism 5 includes a first container 52 and a second container 53, the first container 52 is connected to the second container 53, and the second container 53 is arranged on a side away from the temperature adjustment mechanism 4. The second container 53 is away from the heating area formed by the temperature adjustment mechanism 4, which can avoid the recycled resin from being exposed to the heating area for a long time, and avoid the high temperature from affecting the performance of the recycled resin.

[0161] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0162] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0163] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0164] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0165] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0166] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A post-processing device for 3D printed objects, characterized in that: include: A material receiving mechanism, used for carrying a 3D printed object with excess printing material; A movable mechanism is used to change the dripping position of the 3D printed object so that the excess printing material drips from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the dripping position.

2. The device according to claim 1, characterized in that The movable mechanism is also used for: Maintaining the 3D printed object at at least one dripping position for a preset time; or Continuously switching the 3D printed object between a plurality of the dripping positions; or The 3D printed object is maintained at at least one dripping position for a preset time and is continuously switched between a plurality of the dripping positions.

3. The device according to claim 1, characterized in that The movable mechanism is also used to: maintain the downward dripping position of the opening part of the 3D printed object in the liquid accumulation area for a preset time; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

4. A post-processing device for 3D printed objects, characterized in that: include: A material receiving mechanism, used for carrying a 3D printed object with excess printing material; A movable mechanism is used to set the 3D printed object at a first dripping position in a first time period so that the excess printing material drips 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 a shape feature of the 3D printed object.

5. The device according to claim 4, characterized in that The process of determining the inclination angle in the first dripping position includes: determining the optimal dripping 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 dripping position according to the optimal dripping angle.

6. The device according to claim 4, characterized in that The first dripping position is a dripping position of the opening part of the liquid accumulation area downward; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

7. The device according to claim 1 or 4, characterized in that: It also includes a temperature regulating mechanism, which is used to generate a dynamic temperature distribution and / or regulate the temperature of the area where the 3D printed object is located based on a preconfigured temperature control strategy.

8. The device according to claim 7, characterized in that The dynamic temperature distribution includes controlling the temperature of the area where the 3D printed object is located to be maintained at a first temperature at least in a first time period, and controlling the temperature of the area where the 3D printed object is located to be maintained at a second temperature at least in a second time period, wherein the first temperature is greater than or less than the second temperature.

9. The device according to claim 7, characterized in that The temperature control strategy includes one or more of the following: Controlling the temperature of the area where the 3D printed object is located to maintain it within a preset temperature value range; or The temperature control parameters are determined based on the material type and a pre-configured mapping relationship between the material type and the temperature control parameters.

10. The device according to claim 7, characterized in that The temperature regulating mechanism regulates the temperature of the zone 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.

11. The device according to claim 7, characterized in that The temperature regulating mechanism comprises a heat source and an air outlet component, wherein the heat source and the air outlet component are used to generate heated gas so that the 3D printed object is placed in the heated gas.

12. The device according to claim 11, characterized in that The air outlet component has a plurality of air outlets, and a wind blowing area formed by the plurality of air outlets covers the 3D printed object; or The plurality of air outlets are moved so that the wind blowing area covers the 3D printed object.

13. The device according to claim 12, characterized in that The air outlet of the air outlet component is arranged above or on the side of the 3D printed object, and the heat source is arranged at the air outlet.

14. The device according to claim 7, characterized in that It also includes a temperature sensor, which is used to detect the temperature of the area; wherein the working state of the temperature adjustment mechanism is controlled based on the detection data of the temperature sensor.

15. The device according to claim 1 or 4, characterized in that It also includes an air outlet mechanism, which is used to generate flowing gas so that the 3D printed object is placed in the flowing gas to accelerate the flow of the excess printing material.

16. The device according to claim 1 or 4, characterized in that It also includes a vibration mechanism, which is used to vibrate the 3D printed object to accelerate the flow of the excess printing material.

17. The device according to claim 1 or 4, characterized in that Also included is a material recovery mechanism for collecting at least a portion of the excess printing material.

18. The device according to claim 17, characterized in that A filtering component is provided in the material recovery mechanism.

19. The device according to claim 17, characterized in that The material recovery mechanism comprises a first container and a second container, wherein the first container is communicated with the second container, and the second container is arranged at a side away from the temperature adjustment mechanism.

20. The device according to claim 1 or 4, characterized in that The movable mechanism comprises: Drive components; The material receiving mechanism is connected to the driving component so that the driving component drives the material receiving mechanism and the drop position of the 3D printed object to change.

21. The device according to claim 1 or 4, characterized in that The movable mechanism includes a toggle member disposed in the material receiving mechanism, and the toggle member is used to drive the 3D printed object to switch the dripping position.

22. The device according to claim 1 or 4, characterized in that The movable mechanism includes a grabbing member, and the grabbing member 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.

23. The device according to claim 1 or 4, characterized in that The material receiving mechanism comprises: The material receiving body has an opening, a liquid outlet and a receiving cavity for receiving the printed piece, the opening is communicated with the receiving cavity, and the liquid outlet is communicated with the receiving cavity.

24. The device according to claim 23, characterized in that The material receiving mechanism comprises a net bag structure.

25. The device according to claim 23, characterized in that The material receiving mechanism also includes: A cover plate is arranged opposite to the opening, and the cover plate is arranged on the material receiving body to open or close the opening.

26. A post-processing method for 3D printed objects, characterized in that: include: Carrying 3D printed objects with excess printing material; The dripping position of the 3D printed object is changed so that the excess printing material drips from the 3D printed object; wherein the 3D printed object has at least two different inclination angles during the change of the dripping position.

27. The method according to claim 26, characterized in that Also includes: Maintaining the 3D printed object at at least one dripping position for a preset time; or Continuously switching the 3D printed object between a plurality of the dripping positions; or The 3D printed object is maintained at at least one dripping position for a preset time and is continuously switched between a plurality of the dripping positions.

28. The method according to claim 26, characterized in that Also includes: The 3D printed object is maintained at a downward dripping position of the opening portion of the liquid accumulation area for a preset time; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

29. A post-processing method for 3D printed objects, characterized in that: include: Carrying 3D printed objects with excess printing material; The 3D printed object is set at a first dripping position in a first time period so that the excess printing material drips 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 a shape feature of the 3D printed object.

30. The method according to claim 29, characterized in that The process of determining the inclination angle in the first dripping position includes: determining the optimal dripping 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 dripping position according to the optimal dripping angle.

31. The method according to claim 29, characterized in that The first dripping position is a dripping position of the opening part of the liquid accumulation area downward; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

32. The method according to claim 26 or 29, characterized in that The method also includes: 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.

33. The method according to claim 32, characterized in that The dynamic temperature distribution includes controlling the temperature of the area where the 3D printed object is located to be maintained at a first temperature at least in a first time period, and controlling the temperature of the area where the 3D printed object is located to be maintained at a second temperature at least in a second time period, wherein the first temperature is greater than or less than the second temperature.

34. The method according to claim 32, characterized in that The temperature control strategy includes one or more of the following: Controlling the temperature of the area where the 3D printed object is located to maintain it within a preset temperature value range; or The temperature control parameters are determined based on the material type and a pre-configured mapping relationship between the material type and the temperature control parameters.

35. The method according to claim 32, characterized in that Also includes: The zone temperature is adjusted by one or more of the following: quartz heating tubes, PTC heating sources, infrared heating sources, heated fluids, heated gases, heating plates or heat exchangers.

36. The method according to claim 32, characterized in that Also includes: A heated gas is applied so that the 3D printed object is within the heated gas.

37. The method according to claim 32, characterized in that Also includes: Acquire temperature detection data; and control the working state of the temperature regulating mechanism based on the temperature detection data.

38. The method according to claim 26 or 29, characterized in that Also includes: Applying flowing gas so that the 3D printed object is placed in the flowing gas to accelerate the flow of the excess printing material.

39. The method according to claim 26 or 29, characterized in that Also includes: The 3D printed object is vibrated to accelerate the flow of the excess printing material.

40. The method according to claim 26 or 29, characterized in that Also includes: At least a portion of the excess printing material is collected.

41. The method according to claim 40, characterized in that Also includes: The collected excess printing material is filtered.

42. The method according to claim 40, characterized in that Also includes: Reuse the filtered excess printing material in subsequent 3D printing; Alternatively, the filtered excess printing material can be mixed with new printing material to reuse the mixed printing material in subsequent 3D printing.

43. A 3D printing system, characterized in that: It comprises a 3D printer and a post-processing device for 3D printing an object as described in any one of claims 1 to 25; the post-processing device is independently arranged or integrated with the 3D printer.

44. A 3D printing method, characterized in that: include: Exposing the printing material to polymerize the printing material to form a 3D printed object; The 3D printed object is processed using the post-processing method for a 3D printed object as described in any one of claims 26 to 42.

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