Post-processing device, three-dimensional printing apparatus, and system for three-dimensional printing

Abstract

The application provides a post-processing device, a three-dimensional printing device and a system for three-dimensional printing. The post-processing device is applied to the three-dimensional printing device, and the post-processing device comprises: a material receiving mechanism, which is used for carrying a 3D printed object with excess printing material; a movable mechanism, which is used for changing a dripping position of the 3D printed object, so that the excess printing material drips from the 3D printed object; during the change of the dripping position, the 3D printed object has at least two different inclination angles; or the movable mechanism is used for setting the 3D printed object at a first dripping position in a first time period, so as to separate the excess printing material adhered to the 3D printed object; and 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. Through the technical scheme provided in the application, the problem of poor separation effect and low efficiency of the existing separation mode of the excess printing material can be solved.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and more specifically, to a post-processing device, a 3D printing apparatus, and a system for 3D printing. Background Technology

[0002] 3D printing technology uses 3D printing equipment to create three-dimensional solid objects by layering data from a 3D model. 3D printing can overcome special structural obstacles that are currently impossible to achieve with traditional machining, enabling the simplified production of arbitrarily complex structural parts. Current 3D printing technologies include stereolithography (SLA), digital light processing (DLP), liquid crystal display (LCD), fused deposition modeling (FDM), and selective laser sintering (SLS).

[0003] After 3D printing, due to the properties of the printing materials, such as the viscosity of resin, the resin can adhere to the surface of the 3D printed object, resulting in a surface covered with liquid resin. This resin presence causes significant material loss and increases the difficulty of subsequent processing. Currently, existing technologies involve allowing the 3D printed object to remain on the platform for a period of time after printing before removing it, facilitating the return of the resin to the material tray.

[0004] However, due to the diverse shapes of 3D printed objects, the existing methods for separating excess printing material are ineffective and inefficient. Summary of the Invention

[0005] This invention provides a post-processing device, a 3D printing equipment, and a system for 3D printing to solve the problems of poor separation effect and low efficiency in the existing technology for separating excess printing material.

[0006] According to one aspect of the present invention, a post-processing apparatus is provided for use in a 3D printing device. The post-processing apparatus includes: a receiving mechanism for carrying a 3D printed object with excess printing material; a movable mechanism for changing the dripping position of the 3D printed object to allow excess printing material to drip off the 3D printed object, wherein the 3D printed object has at least two different tilt angles during the change of the dripping position; or, the movable mechanism is used to position the 3D printed object at a first dripping position during a first time period to separate excess printing material adhering to the 3D printed object, wherein the tilt angle of the 3D printed object at the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object.

[0007] Furthermore, the movable mechanism is a drive mechanism, which is configured to allow the receiving mechanism to rotate from the first state to the second state.

[0008] According to another aspect of the present invention, a post-processing apparatus is provided for use in a 3D printing device. The post-processing apparatus includes: a receiving mechanism configured to carry a 3D printed object with excess printing material; and a driving mechanism configured to allow the receiving mechanism to rotate from a first state to a second state to cause excess printing material to drip off the 3D printed object, wherein the 3D printed object has at least two different tilt angles.

[0009] Furthermore, the drive mechanism is configured to keep the receiving mechanism in the first state for a first time period.

[0010] Furthermore, the receiving mechanism includes a receiving body, which has an opening, a liquid outlet, and a receiving cavity for accommodating the 3D printed object. Both the opening and the liquid outlet are connected to the receiving cavity.

[0011] Furthermore, the post-processing device also includes at least one of a temperature regulation mechanism, an air outlet mechanism, and a vibration mechanism; wherein the temperature regulation mechanism is used to generate a dynamic temperature distribution and / or to regulate the temperature of the area where the 3D printed object is located based on a pre-configured temperature control strategy; the air outlet mechanism is used to generate flowing gas so that the 3D printed object is in the flowing gas to accelerate the flow of excess printing material; and the vibration mechanism is used to make the 3D printed object vibrate to accelerate the flow of excess printing material.

[0012] Furthermore, the 3D printing equipment includes a forming platform, a material tray, and a separation device. The forming platform has a forming surface for attaching a 3D printed object, and the separation device is used to separate the 3D printed object from the forming surface. The receiving body is configured to allow movement between a first position and a second position. The receiving body is configured to receive the 3D printed object with excess printing material in the first position and to allow the receiving body to rotate from the first state to the second state in the second position.

[0013] Furthermore, the 3D printing equipment includes a forming platform, a material tray, and a separation device. The forming platform has a forming surface for attaching the 3D printed object, and the separation device is used to separate the 3D printed object from the forming surface. The 3D printing equipment also includes a conveying assembly for transferring the 3D printed object separated from the forming surface to a receiving body.

[0014] Furthermore, the drive mechanism also includes a first transmission mechanism, which is drivenly connected to the receiving body to drive the receiving body to rotate around the transverse axis.

[0015] Furthermore, the first transmission mechanism includes a motor, a synchronous belt, and a rotating shaft. The motor is located on one side of the receiving body, the output end of the motor is connected to one end of the synchronous belt, the other end of the synchronous belt is connected to the rotating shaft, and the rotating shaft is located on the receiving body; or, the first transmission mechanism includes a motor and a rotating shaft, the motor is located on one side of the receiving body, the output end of the motor is connected to the rotating shaft, and the rotating shaft is located on the receiving body.

[0016] Furthermore, the drive mechanism also includes a sliding component, which can drive the receiving body to move between a first position and a second position.

[0017] Furthermore, the receiving body includes a cover plate, which is closable and disposed at the opening; a stop is provided on the cover plate, and when the receiving body moves to the first position, the stop abuts against the outer shell of the 3D printing equipment; a return spring is provided between the cover plate and the receiving body.

[0018] Furthermore, the sliding assembly includes a first motor, a second motor, a slide table, and a connecting rod. The first motor is used to drive the slide table to move the receiving body between a first position and a second position. The connecting rod is disposed on the slide table, and the receiving body is rotatably disposed on the connecting rod. The second motor is used to drive the receiving body to rotate relative to the connecting rod, so that the receiving body rotates from the first state to the second state in the second position.

[0019] Furthermore, the receiving body includes a side and a bottom, one end of the side is connected to the bottom, the opening of the receiving body is located on the side of the receiving body opposite to the bottom, and the liquid outlet is located on the side and / or the bottom.

[0020] Furthermore, the receiving body has a structure that includes one of the following: square, spherical, hemispherical, V-shaped, or funnel-shaped structures, and the liquid outlet includes one or more of the following: round hole, square hole, triangular hole, or strip-shaped opening.

[0021] Furthermore, the cross-sectional area of ​​the receiving body gradually decreases from top to bottom.

[0022] Furthermore, the receiving body includes an oleophobic layer or a hydrophobic layer.

[0023] Furthermore, the receiving mechanism also includes a first liquid receiving container configured to receive printing material from the receiving body.

[0024] Furthermore, the receiving mechanism also includes: a receiving container located below the first receiving container; a first transmission mechanism capable of rotating the receiving body to move the 3D printed object out of the opening of the receiving body and into the receiving container through the opening of the receiving container; and a second transmission mechanism capable of driving the first receiving container to move relative to the receiving container to allow the 3D printed object to enter the receiving container through the opening of the receiving container.

[0025] Furthermore, the receiving mechanism also includes: a receiving container located on the side of the receiving body; a transfer receiving container, wherein the first transmission mechanism can rotate the receiving body to move the 3D printed object out of the opening of the receiving body and into the transfer receiving container; a toggle mechanism and a third transmission mechanism, wherein the toggle mechanism is located in the transfer receiving container and the third transmission mechanism can drive the toggle mechanism to move the 3D printed object out of the transfer receiving container and into the receiving container through the opening of the receiving container.

[0026] Furthermore, the receiving container is equipped with a full sensor, which is used to detect whether the printed objects in the receiving container have piled up to a predetermined height or whether the printed objects in the receiving container have reached a predetermined weight.

[0027] Furthermore, the receiving mechanism also includes: a second liquid receiving container, which is used to connect to the material recycling container; the opening of the second liquid receiving container is connected to the first liquid receiving container; and / or, a liquid receiving track is provided between the second liquid receiving container and the 3D printing equipment.

[0028] According to another aspect of the present invention, a three-dimensional printing apparatus is provided, the three-dimensional printing apparatus including the post-processing device provided above, the three-dimensional printing apparatus further including: a material tray for holding printing material; a forming platform having a forming surface and for adhering the printing material layer by layer to the forming surface to obtain a 3D printed object; a separation device for separating the 3D printed object from the forming surface, wherein the separation device includes one of a scraping mechanism, an extrusion mechanism, an ejection mechanism or a laser cutting mechanism.

[0029] Furthermore, the 3D printing equipment also includes a conveying assembly for transferring the 3D printed object separated from the forming surface to the receiving body of the post-processing unit; the conveying assembly has a first position moved above the material tray and a second position moved above the receiving body to transfer the 3D printed object into the receiving body.

[0030] Furthermore, the 3D printing equipment also includes a pipeline for conveying printing material into a tray, one end of which is connected to the material recycling container of the post-processing unit, and the other end is connected to the tray.

[0031] According to another aspect of the present invention, a system for three-dimensional printing is provided, comprising at least one three-dimensional printing device and a post-processing device as described above.

[0032] According to the technical solution of this invention, the post-processing device includes a receiving mechanism and a movable mechanism. The movable mechanism changes the dripping position of the 3D printed object, allowing the 3D printed object to have at least two different tilt angles during the dripping position change, so that excess printing material drips off the 3D printed object. Alternatively, the movable mechanism can be used to position the 3D printed object at a first dripping position during a first time period to separate excess printing material adhering to the 3D printed object. By adjusting the dripping angle, the entire dripping process is not fixed at a single dripping position, thus better separating excess printing material from the 3D printed object and improving the efficiency of excess resin separation. Since the tilt angle of the 3D printed object at the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object, it also better separates excess printing material from the 3D printed object, improving the efficiency of excess resin separation. Furthermore, the device provided by this invention achieves better resin separation, reduces solvent consumption and cleaning time during subsequent cleaning, and allows for the recovery of separated resin. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 A schematic diagram of the structure of a post-processing apparatus provided according to an embodiment of the present invention is shown;

[0035] Figure 2 A schematic diagram of the structure of a three-dimensional printing device provided according to an embodiment of the present invention is shown;

[0036] Figure 3 Another structural schematic diagram of the post-processing apparatus provided according to an embodiment of the present invention is shown;

[0037] Figure 4 A schematic diagram of the material receiving body of the post-processing apparatus provided according to an embodiment of the present invention is shown;

[0038] Figure 5 Another structural schematic diagram of the receiving body of the post-processing apparatus provided according to an embodiment of the present invention is shown;

[0039] Figure 6 A further structural schematic diagram of the receiving body of the post-processing apparatus provided according to an embodiment of the present invention is shown;

[0040] Figure 7 A schematic diagram of another usage state of the receiving body of the post-processing apparatus provided according to an embodiment of the present invention is shown;

[0041] Figure 8 Another structural schematic diagram of a three-dimensional printing device provided according to an embodiment of the present invention is shown;

[0042] Figure 9 A front view of a post-processing apparatus provided according to an embodiment of the present invention is shown;

[0043] Figure 10 This is a right view of the receiving mechanism and the 3D printed object provided in an embodiment of the present invention;

[0044] Figure 11 This is a structural diagram of a 3D printed object;

[0045] Figure 12 This is a schematic diagram of the existing technology for cleaning excess resin by centrifugation;

[0046] Figure 13 Another front view of the post-processing apparatus provided according to an embodiment of the present invention is shown;

[0047] Figure 14 This is a schematic diagram of the material receiving mechanism provided in an embodiment of the present invention;

[0048] Figure 15 A front view of a post-processing apparatus provided according to an embodiment of the present invention is shown;

[0049] Figure 16 This is a schematic diagram of dynamic temperature distribution provided in an embodiment of the present invention;

[0050] Figure 17 A front view of a post-processing apparatus provided according to an embodiment of the present invention is shown;

[0051] Figure 18 A front view of a post-processing apparatus provided according to an embodiment of the present invention is shown;

[0052] Figure 19 A front view of a post-processing apparatus provided according to an embodiment of the present invention is shown;

[0053] Figure 20 This is a schematic diagram of centrifugal force.

[0054] The above figures include the following reference numerals:

[0055] 1. 3D printed object; 11. Liquid accumulation area; 2. Receiving mechanism; 21. Receiving body; 210. Opening; 211. Liquid outlet; 212. Receiving cavity; 213. Side; 214. Bottom; 22. Cover plate; 221. Stop; 23. First liquid receiving container; 24. Second transmission mechanism; 241. Sector gear; 242. Rack; 25. Receiving container; 26. Second liquid receiving container; 27. Liquid receiving track; 28. Transfer receiving container; 291. Actuating mechanism; 292. Third transmission mechanism; 3. Movable mechanism 31. Drive mechanism; 311. First transmission mechanism; 312. Sliding assembly; 3121. Slide table; 3122. Connecting rod; 4. Temperature regulation mechanism; 41. Air outlet assembly; 42. Heat source; 43. Guide rail; 44. Temperature sensor; 5. Material recycling container; 6. Excess printing material; 111. Molding platform; 112. Material tray; 113. Separation device; 114. Lifting mechanism; 115. Platform mounting structure; 116. Light source; 117. Conveying assembly; 1171. Receiving component; 1172. Material feeding component. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] like Figures 1 to 10 As shown, this embodiment of the invention provides a post-processing device applied to a 3D printing equipment. The post-processing device includes a receiving mechanism 2 and a movable mechanism 3. The receiving mechanism 2 is used to carry a 3D printed object 1 with excess printing material. The movable mechanism 3 is used to change the dripping position of the 3D printed object 1 so that excess printing material drips off the 3D printed object 1. During the change of the dripping position, the 3D printed object 1 has at least two different tilt angles; or, the movable mechanism 3 is used to position the 3D printed object 1 at a first dripping position during a first time period to separate the excess printing material adhering to the 3D printed object 1. The tilt angle of the 3D printed object 1 at the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1.

[0058] The post-processing device provided in this embodiment uses a movable mechanism 3 to change the dripping position of the 3D printed object 1, causing excess printing material to drip off the 3D printed object 1. Alternatively, the movable mechanism 3 can be used to position the 3D printed object 1 at a first dripping position during a first time period to separate excess printing material adhering to the 3D printed object 1. Because the dripping angle is adjusted, the entire dripping process is not fixed at a single dripping position, allowing for better separation of excess printing material 6 from the 3D printed object 1. Furthermore, since the tilt angle of the 3D printed object 1 at the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1, it also allows for better separation of excess printing material 6, while improving the efficiency of excess resin separation. Simultaneously, the device provided by this invention achieves better resin separation, reduces solvent consumption and cleaning time during subsequent cleaning, and allows for the recovery of separated resin.

[0059] Specifically, the reduction of excess printing material 6 on the 3D printed object 1 after dripping makes subsequent processes (such as cleaning) easier and saves on solvent consumption during cleaning. It also allows for connection to solvent-free cleaning methods (centrifugation, vacuum, etc.). Furthermore, in some scenarios, most of the resin on the 3D printed object 1 has been removed after dripping, allowing for direct secondary curing of the 3D printed object and reducing post-processing steps.

[0060] In existing technologies, the industry mostly uses a gravity-feeding method. After printing, the 3D printed object is left on the platform for a period of time before being removed, or the platform with the 3D printed object is tilted to facilitate resin return to the tray. However, the entire process is completed on the printer, which is not only inefficient and results in a small amount of recycled resin, but also leads to low equipment utilization and affects the overall production rhythm due to the occupation of the printer and platform. The post-processing device provided in this embodiment can accelerate and increase resin recycling without occupying the 3D printer.

[0061] It should be noted that the post-processing device provided in this embodiment can realize automated adjustment of multi-angle dripping, and the device can be equipped with or without a forming platform.

[0062] The movable mechanism 3 can employ a lever structure to directly move the 3D printed object, changing its angle to achieve resin dripping at at least two different angles. This method does not require rotating the receiving mechanism. Alternatively, external forces can be used to accelerate resin dripping, such as wind, slight centrifugal vibration, shaking, rotational acceleration, or swaying. The goal is to ensure more complete resin dripping. This method involves only slight movements to accelerate resin dripping, resulting in a relatively simple and automated structure. Alternatively, heating can be used to reduce resin viscosity, making resin dripping easier. Heating methods include far-infrared light and heated gas. A resin recovery structure can also be added: using screens or filters to recover the resin. The recovered resin can be mixed with new resin in a certain proportion for reuse, or used directly.

[0063] Specifically, the angle of the receiving mechanism is adjusted according to a preset value each time, or the angle can be adjusted to match the shape of the 3D printed object. After each angle adjustment, a timer starts, and the next angle is switched after the set time is reached, ensuring a consistent dripping time at each angle. The set time can be 2, 3, 5 minutes, etc. Heating can be applied before or after angle adjustments. A temperature sensor can be used to adjust the heating source's on / off state accordingly. An air blowing mechanism (air knife, air gun, etc.) can also be activated before or after angle adjustments to blow air onto the 3D printed object. The air blowing can also be timed.

[0064] In this embodiment, the movable mechanism 3 is a drive mechanism 31, which is configured to allow the receiving mechanism 2 to rotate from a first state to a second state so that excess printing material drips from the 3D printed object 1, wherein the 3D printed object 1 has at least two different tilt angles. When the receiving mechanism 2 rotates from the first state to the second state, excess printing material can drip from the 3D printed object 1.

[0065] It should be noted that the material receiving mechanism 2 rotates from the first state to the second state, including continuous switching and intermittent switching. The dripping position or tilt angle of the 3D printed object 1 corresponding to the first state and the second state are different. In other words, during the process of the material receiving mechanism 2 rotating from the first state to the second state, the dripping position of the 3D printed object 1 changes, and during the change of the dripping position, the 3D printed object 1 has at least two different tilt angles, so that excess printing material drips off the 3D printed object 1. For example, the 3D printed object 1 is held at at least one dripping position for a preset time; or the 3D printed object 1 is continuously switched between several dripping positions; or the 3D printed object 1 is held at at least one dripping position for a preset time and continuously switched between several dripping positions.

[0066] In one implementation, the drive mechanism 31 can also be configured to keep the receiving mechanism 2 in a first state for a first time period to separate excess printing material 6 adhering to the 3D printed object 1. It should be noted that configuring the drive mechanism 31 to keep the receiving mechanism 2 in the first state for a first time period means that the drive mechanism 31 is configured to keep the receiving mechanism 2 stationary at a certain drop position for a period of time.

[0067] It is understandable that in one implementation, the first state corresponds to the first drop position. That is, when the receiving mechanism 2 is in the first state, the 3D printed object 1 is placed at the first drop position to separate the excess printing material adhering to the 3D printed object 1. The tilt angle of the 3D printed object 1 at the first drop position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1.

[0068] like Figure 1 , Figure 2 As shown in the figure, this embodiment of the invention provides a post-processing device applied to a 3D printing equipment. The 3D printing equipment includes a forming platform 111, a material tray 112, and a separation device 113. The forming platform 111 has a forming surface for attaching the 3D printed object 1. The forming platform 111 is mounted on a lifting mechanism 114 via a platform mounting structure 115. A light source 116 can illuminate the material tray 112. The structural diagram of the 3D printing equipment is shown below. Figure 19 As shown. The post-processing device includes a receiving mechanism 2 and a driving mechanism 31. The receiving mechanism 2 is configured to carry the 3D printed object 1 with excess printing material, and the driving mechanism 31 is configured to allow the receiving mechanism 2 to rotate from a first state to a second state. When the receiving mechanism 2 rotates from the first state to the second state, excess printing material can drip from the 3D printed object 1, so that the entire dripping process is not fixed at a single dripping position, which can better separate the excess printing material 6 on the 3D printed object 1, and at the same time improve the efficiency of separating excess resin.

[0069] like Figure 1 , Figure 2 As shown, the receiving mechanism 2 includes a receiving body 21, which has an opening 210, a liquid outlet 211, and a receiving cavity 212 for accommodating the 3D printed object 1. Both the opening 210 and the liquid outlet 211 are connected to the receiving cavity 212. The 3D printed object 1 can enter the receiving cavity 212 through the opening 210, and excess printing material 6 on the 3D printed object 1 can drip off through the liquid outlet 211.

[0070] In one embodiment, the 3D printing equipment can automatically transfer the printed 3D object to the receiving body 21. Specifically, the 3D printing equipment also includes a separating device 113 and a conveying assembly 117. The separating device 113 is used to separate the 3D printed object 1 from the forming surface, and the conveying assembly 117 is used to transfer the 3D printed object 1 separated from the forming surface to the receiving body 21. For ease of understanding, the separating device 113 will be described below using a scraping mechanism as an example. In other embodiments, the separating device 113 can also be an extrusion mechanism, an ejection mechanism, or a laser cutting mechanism, etc., and there is no limitation thereto.

[0071] Specifically, such as Figure 2 As shown, the scraping mechanism can be located between the forming platform and the material tray, and can be used to automatically separate the 3D printed object from the forming surface after printing is completed, so that the forming platform can continue to be used to print the next 3D printed object without the operator having to manually remove the forming platform from the printer for scraping. The conveying assembly 117 is used to transfer the 3D printed object 1 separated from the forming surface to the receiving body 21, so that the receiving body 21 can be used to separate the excess printing material 6 on the 3D printed object 1. The scraping mechanism may include a scraper assembly and a scraper drive assembly. The scraper assembly may include a scraper. The scraper drive assembly can be used to drive at least one of the scraper and the forming platform, so that relative movement can occur between the scraper and the forming platform, so as to peel the 3D printed object from the forming surface by the scraper.

[0072] Furthermore, the conveying assembly 117 includes a conveying drive assembly and a receiving member 1171. The conveying drive assembly drives the receiving member 1171 to move between the receiving position and the discharging position, thereby cooperating with the scraping mechanism to automatically scrape off and transfer the printed 3D printed object adhered to the forming platform, thus realizing fully automatic scraping and receiving of the 3D printed object without human intervention. In this embodiment, the receiving member 1171 has a receiving space for accommodating the 3D printed object, and can be basket-shaped or box-shaped. A discharge port communicating with the receiving space is provided on one side of the receiving member 1171, allowing the 3D printed object to be removed from the receiving member 1171. Of course, in other optional embodiments of this application, the receiving member 1171 can have different structural forms, such as a plate shape, as long as it can serve the function of receiving the 3D printed object.

[0073] Furthermore, the conveying assembly 117 may also include a material-pushing component 1172, which can be used to push the 3D printed object in the receiving component 1171 to the receiving body 21, thereby freeing up the receiving space so that the receiving component 1171 can continue to carry other 3D printed objects. The material-pushing component 1172 may include a material-pushing part, which is used to push the 3D printed object in the receiving space during the material-pushing stage to push it out of the discharge port.

[0074] like Figure 1 As shown, the receiving body 21 includes a side portion 213 and a bottom portion 214. One end of the side portion 213 is connected to the bottom portion 214. The opening 210 of the receiving body 21 is located on the side of the receiving body 21 opposite to the bottom portion 214. The liquid outlet 211 is located on the side portion 213 and / or the bottom portion 214. The 3D printed object 1 can enter through the opening 210 on one side of the receiving body 21, and excess printing material 6 on the 3D printed object 1 can drip off through the liquid outlet 211 on the side portion 213 and / or the bottom portion 214.

[0075] The driving mechanism 31 further includes a first transmission mechanism 311, which is drivenly connected to the receiving body 21 to drive the receiving body 21 to rotate around the transverse axis. During the rotation of the receiving body 21, or after the receiving body 21 changes position by rotation, excess printing material 6 on the 3D printed object 1 can be separated.

[0076] In one embodiment, such as Figure 1 As shown, the first transmission mechanism 311 includes a motor, a synchronous belt, and a rotating shaft. The motor is located on one side of the receiving body 21, and the output end of the motor is connected to one end of the synchronous belt. The other end of the synchronous belt is connected to the rotating shaft, which is mounted on the receiving body 21. When the motor rotates, it drives the synchronous belt to rotate, which in turn drives the rotating shaft to rotate. This, in turn, drives the receiving body 21 to rotate, thereby enabling the receiving body 21 to rotate around a transverse axis.

[0077] In one embodiment, such as Figure 3 As shown, the first transmission mechanism 311 includes a motor and a rotating shaft. The motor is located on one side of the receiving body 21, and its output end is connected to the rotating shaft, which is mounted on the receiving body 21. The motor directly drives the rotating shaft to rotate, thereby driving the receiving body 21 to rotate, and thus driving the receiving body 21 to rotate around its transverse axis. Using a direct-drive method with a motor simplifies the drive structure.

[0078] In other embodiments, the motor can be replaced with a rotary cylinder, or the first transmission mechanism 311 can be a combination of a lead screw and a motor. Alternatively, a cylinder, synchronous pulley, synchronous belt, sprocket chain, gear rack, worm gear, etc., can be used to achieve the rotation of the receiving body 21.

[0079] In one embodiment, the cross-sectional area of ​​the receiving body 21 gradually decreases from top to bottom. Excess printing material 6 on the 3D printed object 1 can flow down along the inclined inner wall of the receiving body 21, facilitating the dripping of excess printing material 6 through the liquid outlet 211.

[0080] It should be noted that, as Figure 4 , Figure 5As shown, the material receiving body 21 has a structure that includes one of the following: square, spherical, hemispherical, V-shaped, or funnel-shaped. The liquid outlet 211 includes one or more of the following: round hole, square hole, triangular hole, or strip-shaped opening. The structural type of the material receiving body 21 and the type of the liquid outlet 211 can be arbitrarily combined, as long as they can support the 3D printed object 1 and allow excess printing material 6 to drip off.

[0081] In one embodiment, the receiving body 21 includes an oleophobic layer or a hydrophobic layer. By adjusting the polarity of the material, the polarities of the printing filament and the receiving body 21 are mutually repulsive. For example, if the resin is oil-based, an oleophobic material, i.e., an oleophobic layer, can be provided on the surface of the receiving body 21. If the resin is water-based, a hydrophobic material, i.e., a hydrophobic layer, can be provided on the surface of the receiving body 21. Alternatively, the receiving body 21 can be directly made of an oleophobic / hydrophobic material.

[0082] In one embodiment, the receiving mechanism 2 further includes a first liquid receiving container 23 configured to receive printing material from the receiving body 21. Excess printing material 6 can drip down through the liquid outlet 211 and enter the first liquid receiving container 23.

[0083] In one embodiment, such as Figure 1 , Figure 2 As shown, the receiving mechanism 2 also includes a receiving container 25 and a second transmission mechanism 24. The receiving container 25 is located below the first liquid receiving container 23. The first transmission mechanism 311 can rotate the receiving body 21 to move the 3D printed object 1 out from the opening 210 of the receiving body 21 and into the receiving container 25 through the opening of the receiving container 25. Thus, the receiving container 25 receives the 3D printed object 1 in the receiving body 21, completing a fully automated process of picking up the part, dripping the liquid, and recycling. The second transmission mechanism 24 can drive the first liquid receiving container 23 to move relative to the receiving container 25 to allow the 3D printed object 1 to enter the receiving container 25 through the opening of the receiving container 25, avoiding obstruction by the first liquid receiving container 23 during the process of the 3D printed object 1 entering the receiving container 25.

[0084] It should be noted that the first transmission mechanism and the second transmission mechanism can be driven independently (for example, two motors drive the receiving body and the first liquid receiving container respectively), or they can be driven synchronously through structural linkage.

[0085] like Figure 1 As shown, the linkage to achieve synchronous drive can be achieved through the following structure: the second transmission mechanism 24 includes a sector gear 241 and a rack 242. The sector gear and the synchronous wheel are fixed on the same shaft, and the synchronous movement of the two transmission mechanisms is achieved by a single drive motor.

[0086] In one embodiment, reference is made to... Figure 3The receiving mechanism 2 also includes a receiving container 25, a transfer receiving container 28, a tossing mechanism 291, and a third transmission mechanism 292. The receiving container 25 is located to the side of the receiving body 21. The first transmission mechanism 311 can rotate the receiving body 21 to move the 3D printed object 1 from the opening 210 of the receiving body 21 and into the transfer receiving container 28. The tossing mechanism 291 is located in the transfer receiving container 28. The third transmission mechanism 292 can drive the tossing mechanism 291 to move the 3D printed object 1 from the transfer receiving container 28 and through the opening of the receiving container 25 into the receiving container 25, completing a fully automated process of picking up the part, dripping the liquid, and recycling. By setting up the transfer receiving container 28, the 3D printed object 1 can be transferred using the transfer receiving container 28, offering the advantage of flexible transfer.

[0087] It should be noted that the receiving container 25 can also be equipped with a material full sensor. The material full sensor is used to detect whether the printed objects in the receiving container 25 have accumulated to a predetermined height, or whether the printed objects in the receiving container 25 have reached a predetermined weight. In this way, it can be determined whether the printed objects need to be transferred based on the accumulation height or total weight of the printed objects in the receiving container 25.

[0088] Among them, such as Figure 2 As shown, the receiving mechanism 2 also includes a second liquid receiving container 26, which is connected to the material recycling container 5. The opening of the second liquid receiving container 26 is connected to the first liquid receiving container 23. Excess printing material 6 collected by the first liquid receiving container 23 from the 3D printed object 1 can enter the second liquid receiving container 26, realizing the recycling of printing material. A liquid receiving track 27 is provided between the second liquid receiving container 26 and the 3D printing equipment. The liquid receiving track 27 is used to guide the resin dripping during the part receiving process into the second liquid receiving container 26. The recycled resin can be filtered and reused, or mixed with new resin in a certain proportion for use.

[0089] Specifically, there are various ways to recycle resin. Since the recycled resin is close to the reaction zone, its material properties differ slightly from virgin resin. For secondary use, the recycled resin can be mixed with virgin resin according to the actual needs of the 3D printed object. When using a collection and centralized reuse method, different mixing ratios or no mixing may be necessary depending on the actual requirements. When the resin is directly fed back to the printer for recycling after draining, no further mixing is needed since the material tray already contains virgin resin.

[0090] In one embodiment, such as Figures 6-8As shown, the separating device 113 is used to separate the 3D printed object 1 from the forming surface. The receiving body 21 is configured to allow movement between a first position and a second position. The receiving body 21 is configured to receive the 3D printed object 1 with excess printing material in the first position, and to allow the receiving body 21 to rotate from the first state to the second state in the second position. It can be understood that when the receiving body 21 moves to the first position, it is located below the separating device 113, and the separating device 113 separates the 3D printed object 1 from the forming surface. At this time, the receiving body 21 can receive the 3D printed object 1 with excess printing material. Then, the receiving body 21 is moved to the second position, where it is located on one side of the 3D printing device. The receiving body 21 can rotate from the first state to the second state, thereby separating the excess printing material 6 from the 3D printed object 1.

[0091] The receiving body 21 includes a cover plate 22, which is closable and positioned at the opening 210 of the receiving body 21. A stop 221 is provided on the cover plate 22, and a return spring is provided between the cover plate 22 and the receiving body 21. When the receiving body 21 moves to the first position, the stop 221 abuts against the outer shell of the 3D printing equipment, stopping the cover plate 22 from moving and thus opening it. When the receiving body 21 leaves the first position, the cover plate 22 closes under the force of the return spring. At this time, the cover plate 22 can block the opening 210, preventing the 3D printed object 1 from falling out of the opening 210 of the receiving body 21.

[0092] In one optional embodiment, a magnetic element is provided on the stop 221. The magnetic element can magnetically engage with the 3D printing device, thereby making the position of the cover plate more stable. Using the stop 221 and magnetic attraction to open and close the cover plate 22 has the advantages of simple structure and high reliability. In other embodiments, pneumatic grippers or electric grippers can also be used to drive the cover plate 22 to move.

[0093] It should be noted that if the cover plate is not used, the rotation angle and drip angle of the receiving body 21 need to be controlled during the draining process. The angle during the draining process is limited by the position detection to prevent the 3D printed object from falling out during the dripping process.

[0094] In one embodiment, the drive mechanism 31 further includes a sliding component 312, which can drive the receiving body 21 to move between a first position and a second position. Using a sliding mechanism improves the stability of the receiving body 21 during movement.

[0095] Specifically, such as Figure 8As shown, the sliding assembly 312 includes a first motor, a second motor, a slide table 3121, and a connecting rod 3122. The first motor drives the slide table 3121 to move the receiving body 21 between a first position and a second position, thereby switching the position of the receiving body 21. The connecting rod 3122 is mounted on the slide table 3121, and the receiving body 21 is rotatably mounted on the connecting rod 3122. The second motor drives the receiving body 21 to rotate relative to the connecting rod 3122, so that the receiving body 21 rotates from the first state to the second state in the second position, thereby allowing excess printing material to drip off the 3D printed object 1. The specific working process of rotating from the first state to the second state has been described in the above embodiments and will not be repeated here.

[0096] By employing the above-described embodiments, the dripping angle is adjusted so that the entire dripping process is not fixed at a single dripping position, thus enabling better separation of excess printing material from the 3D printed object and improving the efficiency of excess resin separation. Furthermore, the device provided by this invention achieves superior resin separation, reducing solvent consumption and cleaning time during subsequent cleaning, and also allows for the recovery of the separated resin.

[0097] It should be noted that the correspondence between the post-processing unit and the printer can be set up independently or as a set. Specifically, the configuration of the post-processing unit and the printer can be varied to achieve integrated production. A single printer corresponds to a single post-processing unit. In addition to automatically pouring the printed material into the post-processing unit, 3D printed objects from multiple printers can be collected and placed into the receiving body of one or more post-processing units by equipment or manually. Alternatively, 3D printed objects from one printer can be placed into the receiving body of one or more post-processing units.

[0098] like Figure 19 As shown, another embodiment of the present invention provides a 3D printing device, which includes the post-processing device described above. The 3D printing device also includes a material tray 112, a forming platform 111, and a separating device 113. The material tray 112 is used to hold printing material, and the forming platform 111 has a forming surface and is used to adhere the printing material layer by layer to the forming surface to obtain a 3D printed object. The separating device 113 is used to separate the 3D printed object 1 from the forming surface. The separating device 113 includes one of a scraping mechanism, an extrusion mechanism, an ejection mechanism, or a laser cutting mechanism. Therefore, this 3D printing device can also better separate excess printing material 6 from the 3D printed object 1, while improving the efficiency of separating excess resin.

[0099] Exemplarily, the separation device 113 may include a scraper mechanism located between the forming platform and the material tray. This scraper mechanism can automatically separate the 3D printed object from the forming surface after printing, allowing the forming platform to continue printing the next 3D printed object without requiring manual removal of the forming platform from the printer for scraping. For example, the scraper mechanism may include a scraper assembly and a scraper drive assembly. The scraper assembly may include a scraper. The scraper drive assembly can drive at least one of the scraper and the forming platform, enabling relative movement between them to peel the 3D printed object from the forming surface using the scraper. Specifically, the scraper drive assembly can drive the scraper to slide on the forming surface of the forming platform, thereby peeling the printed 3D printed object from the forming surface.

[0100] For example, the separation device 113 may include an ejection mechanism, which includes a substrate and an ejection element. The ejection element is disposed on the substrate, and a through hole is provided on the molding platform. The ejection element corresponds to the hole. The ejection drive assembly is configured to drive the molding platform and the separation device 113 to move from a first position to a second position along a first direction, and to drive the molding platform to move from the second position to a third position along the first direction. At the second position, the substrate of the separation device 113 contacts the limiting device. During the movement of the molding platform from the second position to the third position, the molding platform moves relative to the substrate, causing the ejection element to gradually extend out of the hole of the molding platform. By providing an ejection element on the substrate and a through hole on the molding platform, and by utilizing the cooperation of the ejection drive assembly and the limiting device to allow the ejection element to pass through the hole and eject the 3D printed object from the molding platform, the purpose of automatically separating the 3D printed object from the molding platform is achieved, thereby improving the ease of separation between the 3D printed object and the molding platform in 3D printing technology.

[0101] In one embodiment, the 3D printing equipment further includes a conveying assembly 117 for transferring the 3D printed object 1 separated from the forming surface to a receiving body 21. The conveying assembly 117 has a first position above the material tray 112 and a second position above the receiving body 21 of the post-processing unit to transfer the 3D printed object 1 into the receiving body 21, facilitating subsequent removal of excess printing material 6 from the 3D printed object 1 using the receiving body 21. Exemplarily, the conveying assembly 117 includes a conveying drive assembly and a receiving member 1171. The conveying drive assembly drives the receiving member 1171 to move between a receiving position and an ejection position, thereby cooperating with a scraping mechanism or an ejection mechanism to automatically scrape off and transfer the printed 3D printed object adhering to the forming platform, thus achieving unattended, fully automatic scraping and receiving of the object. In this embodiment, the receiving member 1171 has a receiving space for accommodating 3D printed objects, and can be basket-shaped or box-shaped. A discharge port communicating with the receiving space is provided on one side of the receiving member 1171, allowing the 3D printed object to be removed from the receiving member 1171. Of course, in other optional embodiments of this application, the receiving member 1171 can have different structural forms, such as a plate shape, as long as it can serve the function of receiving 3D printed objects. Further, the conveying assembly 117 may also include a material-pushing member 1172, which can be used to push the 3D printed object in the receiving member 1171 to the receiving body 21, thereby releasing the receiving space and allowing the receiving member 1171 to continue carrying other 3D printed objects. The material-pushing member 1172 may include a material-pushing part, which is used to push the 3D printed object in the receiving space during the material-pushing stage to push it out of the discharge port.

[0102] In this embodiment, the 3D printing equipment also includes a pipeline for conveying printing material to the material tray 112. One end of the pipeline is connected to the material recycling container 5 of the post-processing device, and the other end is connected to the material tray 112, so as to realize the recycling of printing material, save printing material, and reduce costs.

[0103] Another embodiment of the present invention provides a system for 3D printing, including at least one 3D printing device and the post-processing device provided above. Therefore, this 3D printing production system is also better able to separate excess printing material 6 from the 3D printed object 1, while improving the efficiency of excess resin separation.

[0104] To facilitate a better understanding of the present invention, the inventive principles of the present invention will be further described below.

[0105] like Figure 9 , Figure 10As 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.

[0106] It should be noted that the 3D printed object 1 includes solid or semi-solid polymers, and the excess printing material 6 includes uncured polymer resin. After 3D printing is completed, due to the properties of the printing material itself, such as the viscosity of resin, the resin 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 carried 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 forming process, there will be many liquid accumulation areas on the 3D printed object 1, such as inverted cup structures, C-shaped dental molds, hollow dental molds, etc., and these liquid accumulation areas are prone to containing uncured resin material. The presence of this resin will cause a large amount of material loss and also increase the difficulty of subsequent processing. Therefore, it is necessary to separate this excess resin from the 3D printed object 1.

[0107] In this embodiment of the invention, changing the dripping position of the 3D printed object 1 alters its tilt angle, allowing excess printing material 6 to drip off. By adjusting the dripping angle, the dripping process is not fixed at a single position, thus better separating excess printing material from the 3D printed object 1 and improving the efficiency of excess resin separation. Simultaneously, the device provided by this invention achieves superior resin separation, reducing solvent consumption and cleaning time during subsequent cleaning, and also allows for the recovery of the separated resin. In some applications, the 3D printed object 1 can be directly cured after dripping; this invention does not limit this application.

[0108] like Figure 10 (a) Figure 10 (b) and Figure 10As shown in (c), the 3D printed object 1 is placed inside the receiving mechanism 2. 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, denoted 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 tilt angles in different dripping positions. The tilt angle represents the angle between the 3D printed object 1 and the vertical direction (Z direction in the figure), and the value of the tilt angle ranges from -180° to +180°. For example, the tilt angle is determined based on the bottom edge of the 3D printed object 1 that contacts the receiving mechanism 2. For example, the dripping position can be customized based on user needs. For example, the dripping position and the tilt angle can correspond one-to-one, with the tilt angle changing once each time the dripping position changes; or the two can be set separately, with the tilt angle changing multiple times each time the dripping position changes. In practical applications, by changing the tilt angle multiple times, the position of the droplet on the 3D printed object 1 can be changed, which is beneficial for separating excess printing material on different surfaces and in areas of liquid accumulation on the 3D printed object 1.

[0109] Furthermore, the movable mechanism 3 is also used to: hold 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 hold the 3D printed object 1 at at least one dripping position for a preset time and continuously switch it between several dripping positions. The preset time t can be 10s, 30s, 1min, 3min, 5min, etc., and this invention does not limit it.

[0110] It is understood that the movable mechanism 3 in this invention is used to control the dripping position of the 3D printed object 1. After the dripping position is changed, the 3D printed object 1 can still be kept at any dripping position. That is, the entire dripping process is not fixed at a single dripping position. For example, the preset time for different drop positions can be set to be the same or different. For example, after holding the 3D printed object 1 at drop position a for 1 minute, the 3D printed object 1 is changed to drop position b at any speed and held for 3 minutes, and then the 3D printed object 1 is changed to drop position c and held for 1 minute. Alternatively, the 3D printed object 1 can be continuously switched between drop positions a, b, and c, for example, by continuously switching the 3D printed object 1 according to abca or acbca. Alternatively, the 3D printed object 1 can be continuously switched between drop positions a and c and held at drop position b for time t. For example, during the time period t1-t2, the 3D printed object 1 is continuously switched between drop positions a and c at any speed according to acca, and then at time t2, the 3D printed object 1 is changed to drop position b and then held for time t.

[0111] Reference Figure 11In one embodiment, the movable mechanism 3 is further configured to hold the 3D printed object 1 at the downward-facing dripping position of the opening portion of the liquid accumulation region 11 for a preset time; wherein the liquid accumulation region 11 is formed by the structure of the 3D printed object 1 itself. In specific applications, if the 3D printed object 1 has a special structure that causes the liquid accumulation region 11, such as an inverted cup structure, the downward-facing dripping position of the cup opening portion of the inverted cup structure can be recorded as dripping position b. Then, by holding the dripping position b for a time t and continuously switching to other positions, the dripping can be performed, which can further improve the efficiency of separating excess printing material.

[0112] like Figure 12 As shown, this illustrates a prior art method for removing excess resin through centrifugation. The rotating rotor generates a centrifugal force that drives excess printing material away from the center of rotation and away from the object's surface. During centrifugation, the tilt angle of the 3D printed object 1 remains unchanged. Combined with... Figure 11 , Figure 12 It is known that for some 3D printed objects 1 with special structures, such as inverted cup structures, C-shaped dental molds, and hollow dental molds, there will be some liquid accumulation areas 11. When centrifuging to remove the resin, if the opening in the liquid accumulation area 11 is small or not facing downwards, the resin in the liquid accumulation area 11 is not easy to remove. Therefore, centrifugation cannot effectively clean the aforementioned liquid accumulation areas 11, easily resulting in the resin material in the liquid accumulation area not being removed, and the centrifugal cleaning effect is poor. In addition, the speed and time of centrifugal cleaning are difficult to control, and objects with fragile structures are easily damaged by prolonged centrifugal force. Excessive centrifugal force will cause excessive equipment vibration and noise, equipment instability, and resin splashing, making it difficult to collect. Figure 20 As shown, during centrifugation, the direction of the centrifugal force is along the tangential direction, and the resin material will fly out along the tangential direction due to the centrifugal force.

[0113] The device of this invention, by adjusting the dripping angle, ensures that the entire dripping process is not fixed at a single dripping position. Instead, it primarily relies on gravity or the combined force of gravity and other forces (such as wind or vibration) to cause excess printing material to drip off the 3D printed object. This method effectively separates excess printing material from the 3D printed object 1, improving the efficiency of excess resin separation without damaging the 3D printed object. Furthermore, during the resin dripping process, the resin material can fall vertically or in a parabolic trajectory under wind force, similar to rain, preventing it from flying out.

[0114] In one embodiment, the movable mechanism 3 includes a drive mechanism 31; the receiving mechanism 2 is connected to the drive mechanism 31 so that the dripping position of the receiving mechanism 2 and the 3D printed object 1 is changed by the drive mechanism 31.

[0115] Specifically, the drive mechanism 31 includes a rotating shaft, such as the shaft of a motor, which is connected to the receiving mechanism 2. The motor drives the 3D printed object 1 to rotate along axis A, thereby changing the position of the liquid droplets on the 3D printed object 1. Figure 9 As shown. In some embodiments, the motor drives the 3D printed object 1 to rotate around point B, thereby changing the position of the liquid droplet on the 3D printed object 1, as shown. Figure 13 As shown in the diagram, the rotation speed of the motor shaft can be set to a slow speed, much lower than the rotation speed of the centrifuge, such as 50 r / min or less, or even lower, such as 5 r / min, 10 r / min, 15 r / min, 20 r / min, 30 r / min, etc. During rotation, excess printing material is mainly dripped off by gravity, with little or no use of centrifugal force. Of course, the rotation speed can also be set to above 50 r / min as needed, using the combined force of gravity and a slight centrifugal force to make excess printing material drip off. This invention does not limit the rotation speed.

[0116] It should be noted that in this embodiment, the rotating shaft of the drive mechanism 31 is configured not to be parallel to the vertical direction (the direction of gravity). Optionally, the rotating shaft of the drive mechanism 31 can be perpendicular to the vertical direction (the direction of gravity), which can change the position of the liquid droplets on the 3D printed object 1, that is, change the tilt angle relative to the vertical direction. In this invention, excess printing material is mainly separated by gravity, resulting in a simpler structure and higher separation efficiency.

[0117] Reference Figure 14 The receiving mechanism 2 includes a receiving body 21, which has an opening 210, a liquid outlet 211, and a receiving cavity 212 for accommodating 3D printed objects. The opening 210 communicates with the receiving cavity 212, and the liquid outlet 211 communicates with the receiving cavity 212. One or more 3D printed objects 1 are placed in the receiving cavity 212, allowing for the individual separation of excess printing material or the simultaneous separation of excess printing material in large batches. Furthermore, the receiving mechanism 2 also includes a cover plate 22, which is disposed opposite to the opening 210 and is mounted on the receiving body 21 to open or close the opening 210. The cover plate 22 can be connected to the receiving body 21 via magnetic attraction or snap-fit, which is not limited in this respect.

[0118] Understandably, with the addition of the cover plate 22, the cover plate 22 prevents the 3D printed object 1 from falling out of the receiving mechanism 2 during rotation, thereby increasing the tilt angle range of the 3D printed object 1. Exemplarily, the receiving mechanism 2 includes a mesh structure, which may be made of metal. The top of the mesh has an opening 210 and a cover plate 22, and the bottom and side walls of the mesh have multiple liquid outlets 211.

[0119] Reference Figure 15In some embodiments, the post-processing apparatus further includes a temperature regulation mechanism 4, which is used to generate a dynamic temperature distribution and / or regulate the temperature of the area where the 3D printed object 1 is located based on a pre-configured temperature control strategy to reduce the viscosity of the excess printing material 6. Specifically, the temperature regulation mechanism 4 regulates the area temperature 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.

[0120] 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 for at least 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 for at least a second time period, wherein the first temperature is greater than or less than the second temperature.

[0121] It should be noted that in this embodiment, the 3D printed object 1 is a solid or semi-solid polymer that has not undergone a curing process, and it is prone to deformation if exposed to high temperatures for a long time. Dynamic temperature control can reduce the viscosity of excess printing material while preventing deformation of the 3D printed object 1 due to excessively high temperatures. For example, as... Figure 16 As shown in (a), the temperature of the control area is initially high and then low. During the 0-t1 time period, the temperature is increased to reduce the viscosity of the resin material and improve its separation efficiency. Then, after time t1, the temperature is decreased to avoid excessive heat causing deformation of the 3D printed object 1; or, as... Figure 16 As shown in (b), if a large amount of resin adheres to the surface of the 3D printed object 1 when it leaves the printing area, since the resin flows faster under force when there is a large amount of resin, a low temperature can be used during the 0-t1 time period, and then the temperature of the area can be increased during the t1-t2 time period to reduce the viscosity of the resin material. After time t2, the temperature can be decreased to avoid prolonged heating. Figure 16 The area temperatures in (a) and 16(b) represent the temperature setpoints. Since the time for temperature changes depends on the power of the heater / cooler, the heating or cooling process time is not shown in the figure. The figure is an example of the set temperature. In actual applications, the heating process can be slow.

[0122] 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 be maintained within a preset temperature 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.

[0123] For example, such as Figure 16As shown in (c), for certain 3D printed objects 1 that are not easily deformable or do not require high precision, the temperature of the area where the 3D printed object 1 is located can be controlled within a preset temperature range throughout the entire dripping process to improve the efficiency of separating excess printing material. In some embodiments, a database can also be established based on the mapping relationship between printing material type and temperature control parameters to configure different temperature control parameters for different printing materials. The temperature control parameters include one or more of the following: heating start time, heating end time, heating duration, temperature setpoint, and heat dissipation or cooling time. For example, for materials with high viscosity, a method such as... Figure 16 (c) The entire process temperature control method.

[0124] In one embodiment, the post-processing device further includes a temperature sensor 44, which is used to detect the area temperature or ambient temperature; wherein the operating 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 receiving mechanism 2 or near the heat source 42, such as... Figure 17 As shown, by detecting the temperature of the area using sensors, the temperature can be adjusted in real time, thus enabling more precise control of the area's temperature.

[0125] Reference Figure 17 , Figure 18 The temperature regulation mechanism 4 includes a heat source 42 and an air outlet assembly 41, which generate heated gas to place the 3D printed object 1 in the heated gas. The air outlet assembly 41 has several air outlets, and the air blowing area formed by these outlets covers the 3D printed object 1; or the air outlets can be moved to cover the 3D printed object 1. For example, the air outlets of the air outlet assembly 41 are located above the 3D printed object 1, and the heat source 42 is located at the air outlets. The air outlet assembly 41 includes a fan, a guide rail 43, and a drive component. The drive component 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. Figure 17 As shown. Alternatively, multiple fans or fans with multiple air outlets can be set up. In this case, the airflow area of ​​the fans can completely cover the 3D printed object 1 without moving the fans. For example, two fans can be set up to overlap and cover the 3D printed object 1, such as... Figure 18As shown. It is understood that by controlling the temperature of the area using heated gas, the present invention can achieve a uniform temperature distribution in the area where the 3D printed object 1 is located, improving the efficiency of resin separation and preventing deformation of the object due to excessively high temperatures in some areas. In other embodiments, the air outlet of the air outlet assembly 41 can also be located on the side of the 3D printed object 1, and the heat source 42 can also be located on the side of the 3D printed object 1; the present invention does not limit this. In other embodiments, the temperature regulating mechanism 4 can also employ 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 to regulate the temperature of the area; the present invention does not limit this.

[0126] In another embodiment, the post-processing device further includes an air outlet mechanism for generating flowing gas to place the 3D printed object 1 within the flowing gas, thereby accelerating the flow of excess printing material 6. For example, a high-pressure air gun or high-pressure air knife is used to blow compressed air, and the force generated by the high-pressure airflow accelerates the flow of resin material to improve separation efficiency.

[0127] In another embodiment, the post-processing apparatus further includes a vibration mechanism for causing the 3D printed object 1 to vibrate, thereby accelerating the flow of excess printing material 6. For example, a vibrator is mounted on the receiving mechanism 2 to drive the receiving mechanism 2 and the 3D printed object 1 to vibrate, thereby accelerating the flow of resin material through the force of vibration to improve separation efficiency.

[0128] In some embodiments, such as Figure 17 , Figure 18 As shown, the post-processing device also includes a material recycling container 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, it carries away a significant amount of resin material. By setting up the material recycling container 5 to recycle the excess printing material, the recycled resin material can be used in subsequent 3D printing, thereby avoiding material waste and saving printing costs.

[0129] In another embodiment, a post-processing device for 3D printed objects includes a receiving mechanism 2 for carrying a 3D printed object 1 with excess printing material 6; a movable mechanism 3 for positioning the 3D printed object 1 at a first dripping position during a first time period to separate the excess printing material 6 adhering to the 3D printed object 1; wherein the tilt angle of the 3D printed object 1 at the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1.

[0130] 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 drop position, for example... Figure 10(a) The dripping position. It should be noted that the first dripping position may be different for different 3D printed objects 1, and the movable mechanism 3 can make different 3D printed objects 1 be in different dripping positions. For example, 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 tilt angle of the 3D printed object 1 is set at 45° for dripping.

[0131] Optionally, the process of determining the tilt angle at the first drop position includes: determining the optimal drop angle based on a preset angle matching model and the shape features of the 3D printed object 1; and obtaining the tilt angle of the 3D printed object 1 at the first drop position based on the optimal drop angle. For example, a machine learning model is established, and the shape data of the 3D printed object 1 and the corresponding historical angle data are input. Machine learning automatically identifies the optimal drop angle corresponding to the 3D printed object 1. The optimal drop angle represents the angle that maximizes the resin material dripping efficiency or the amount of resin material dripping from the 3D printed object 1, such as the angle when the cup opening faces downwards in an inverted cup structure.

[0132] Optionally, the first drop position is the drop position where the opening of the liquid accumulation region faces downwards; wherein, the liquid accumulation region is formed by the structure of the 3D printed object itself. In specific applications, if the 3D printed object 1 has a special structure that causes a liquid accumulation region 11, such as an inverted cup structure, the drop position where the opening of the inverted cup structure faces downwards can be recorded as the first drop position. Then, the drop is performed by keeping the drop at the first drop position for a time t, which can improve the efficiency of separating excess printing material.

[0133] In this embodiment, the above-mentioned device may also employ the temperature regulation mechanism 4, material recycling container 5, air outlet mechanism, vibration mechanism, etc., as described above, to separate excess printing material 6. The implementation principle is the same as described above, and will not be repeated here.

[0134] The present invention also provides a post-processing method for 3D printed objects, including 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 tilt angles at different drop positions.

[0135] It should be noted that the 3D printed object 1 comprises a solid or semi-solid polymer, and the excess printing material 6 comprises uncured polymer resin. After 3D printing is completed, due to the properties of the printing material itself, such as the viscosity of the resin material, 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 carried out from the printing area. Alternatively, due to the structure of the 3D printed object 1 itself, such as an inverted cup structure, a C-shaped dental mold, or a hollow dental mold, these structures are prone to containing uncured resin material. The presence of this resin will cause a significant amount of material loss and also increase the difficulty of subsequent processing; therefore, it is necessary to separate this excess resin from the 3D printed object 1.

[0136] In this embodiment of the invention, changing the tilt angle of the 3D printed object 1 allows for a change in the dripping position of the resin. Multi-angle dripping enables the separation of excess printing material from the 3D printed object 1, improving the efficiency of excess resin separation. Furthermore, the method provided by this invention, employing non-single-angle dripping, is suitable for special structures such as inverted cup structures and recessed structures, achieving better resin separation results, reducing solvent consumption and cleaning time during subsequent cleaning, and allowing for the recovery of separated resin. In some applications, the 3D printed object 1 can be directly cured after dripping; this invention does not limit this application.

[0137] In some embodiments, such as Figure 10 (a) Figure 10 (b) and Figure 10 As shown in (c), the 3D printed object 1 is placed inside the receiving mechanism 2. 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, denoted 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 tilt angles at different dripping positions. The tilt angle represents the angle between the 3D printed object 1 and the vertical direction (Z direction in the figure), and the tilt angle ranges from -180° to +180°. For example, the tilt angle is determined based on the bottom edge of the 3D printed object 1 that contacts the receiving mechanism 2. In specific applications, by changing the tilt angle multiple times, the dripping position of the 3D printed object 1 can be changed, which is beneficial for separating excess printing material from different surfaces and special structures of the 3D printed object 1.

[0138] Furthermore, the method further includes: holding the 3D printed object 1 at at least one drop position for a preset time; or continuously switching the 3D printed object 1 between several drop positions; or holding the 3D printed object 1 at at least one drop position for a preset time and continuously switching between several drop positions. The preset time t can be 10s, 30s, 1min, 3min, 5min, etc., and this invention does not limit it.

[0139] It is understood that the present invention controls the dripping position of the 3D printed object 1, allowing the 3D printed object 1 to remain at any dripping position after the dripping position is changed; that is, the entire dripping process is not fixed at a single dripping position. For example, the preset time for different dripping positions can be set to be the same or different. After holding the 3D printed object 1 at dripping position a for 1 minute, the 3D printed object 1 is changed to dripping position b and held for 3 minutes, then the 3D printed object 1 is changed to dripping position c and held for 1 minute. Alternatively, the 3D printed object 1 can be continuously switched between dripping positions a, b, and c, for example, by continuously switching the 3D printed object 1 according to abca or acbca. Furthermore, the 3D printed object 1 can be continuously switched between dripping positions a and c and held at dripping position b for time t. For example, during the time period t1-t2, the 3D printed object 1 can be continuously switched between dripping positions a and c according to acca, then at time t2, the 3D printed object 1 is changed to dripping position b and held for time t.

[0140] In practical applications, if the 3D printed object 1 has a special structure, such as an inverted cup rim structure or a concave structure, the downward-facing drop position of the cup rim structure can be recorded as drop position b. Then, by staying at drop position b for a time t and continuously switching to other positions, the drop can be applied, which can further improve the efficiency of separating excess printing material.

[0141] 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 pre-configured temperature control strategy.

[0142] 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 for at least 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 for at least a second time period, wherein the first temperature is greater than or less than the second temperature.

[0143] It should be noted that in this embodiment, the 3D printed object 1 is a solid or semi-solid polymer that has not undergone a curing process, and it is prone to deformation if exposed to high temperatures for a long time. Dynamic temperature control can reduce the viscosity of excess printing material while preventing deformation of the 3D printed object 1 due to excessively high temperatures. For example, as... Figure 16 As shown in (a), the temperature in the control zone is initially high and then low. During the 0-t1 time period, the zone temperature is increased to reduce the viscosity of the resin material and improve its separation efficiency. Then, after time t1, the temperature is decreased to avoid prolonged heating; or, as... Figure 16 As shown in (b), if a large amount of resin adheres to the surface of the 3D printed object 1 when it leaves the printing area, since the resin flows faster under force when there is a large amount of resin, a low temperature can be used during the 0-t1 time period, and then the temperature of the area can be increased during the t1-t2 time period to reduce the viscosity of the resin material. After time t2, the temperature can be decreased to avoid prolonged heating. Figure 16 The area temperatures in (a) and 16(b) represent the temperature setpoints. Since the time for temperature changes depends on the power of the heater / cooler, the heating or cooling process time is not shown in the figure. The figure is an example of the set temperature. In actual applications, the heating process can be slow.

[0144] 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 be maintained within a preset temperature 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.

[0145] For example, such as Figure 16 As shown in (c), for certain 3D printed objects 1 that are not easily deformable or do not require high precision, the temperature of the area where the 3D printed object 1 is located can be controlled within a preset temperature range throughout the entire dripping process to improve the efficiency of separating excess printing material. In some embodiments, a database can also be established based on the mapping relationship between printing material type and temperature control parameters to configure different temperature control parameters for different printing materials. The temperature control parameters include one or more of the following: heating start time, heating end time, heating duration, temperature setpoint, and heat dissipation or cooling time. For example, for materials with high viscosity, a method such as... Figure 16 (c) The entire process temperature control method.

[0146] 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.

[0147] 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.

[0148] Specifically, temperature sensor 44 is used to detect the area temperature or ambient temperature; the operating state of temperature regulating mechanism 4 is controlled based on the detection data of temperature sensor 44. Temperature sensor 44 can be installed on receiving mechanism 2 or near heat source 42, such as... Figure 17 As shown, by detecting the temperature of the area using sensors, the temperature can be adjusted in real time, thus enabling more precise control of the area's temperature.

[0149] In one embodiment, the method further includes applying a heated gas to place the 3D printed object 1 in the heated gas.

[0150] Reference Figure 17 , Figure 18 A temperature regulating mechanism 4 is provided, including a heat source 42 and an air outlet assembly 41. The heat source 42 and the air outlet assembly 41 are used to generate heated gas so that the 3D printed object 1 is placed in the heated gas. The air outlet assembly 41 has several air outlets, and the air blowing area formed by the several air outlets covers the 3D printed object 1; or the several air outlets can be 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 located above the 3D printed object 1, and the heat source 42 is located at the air outlets. The air outlet assembly 41 includes a fan, a guide rail 43, and a driving component. The driving component 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, such as... Figure 17 As shown. Alternatively, multiple fans or fans with multiple air outlets can be set up. In this case, the airflow area of ​​the fans can completely cover the 3D printed object 1 without moving the fans. For example, two fans can be set up to overlap and cover the 3D printed object 1, such as... Figure 18 As shown. It is understood that by controlling the regional temperature using heated gas in this invention, the temperature distribution in the area where the 3D printed object 1 is located can be uniform, improving the efficiency of resin separation and preventing deformation of the object due to excessively high temperatures in some areas. In other embodiments, the air outlet of the air outlet assembly 41 can also be located on the side of the 3D printed object 1, and the heat source 42 can also be located on the side of the 3D printed object 1; this invention does not limit this.

[0151] In one embodiment, the method further includes: applying a flowing gas to place the 3D printed object 1 in the flowing gas to accelerate the flow of the excess printing material 6.

[0152] Specifically, an air outlet mechanism is provided to generate flowing gas, thereby placing the 3D printed object 1 within the flowing gas to accelerate the flow of excess printing material 6. For example, a high-pressure air gun or high-pressure air knife is used to blow compressed air, and the force generated by the high-pressure airflow accelerates the flow of resin material to improve separation efficiency.

[0153] In one embodiment, the method further includes: causing the 3D printed object 1 to vibrate to accelerate the flow of the excess printing material 6.

[0154] Specifically, a vibration mechanism is provided to cause the 3D printed object 1 to vibrate, thereby accelerating the flow of excess printing material 6. For example, a vibrator is mounted on the receiving mechanism 2 to drive the receiving mechanism 2 and the 3D printed object 1 to vibrate, thereby accelerating the flow of resin material through the force of vibration and improving separation efficiency.

[0155] In one embodiment, the method further includes collecting at least a portion of the excess printing material 6.

[0156] Furthermore, the method also includes filtering the collected excess printing material 6.

[0157] Furthermore, the method also 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.

[0158] In some embodiments, such as Figure 17 , Figure 18 , Figure 19 As shown, a material recycling container 5 is provided to collect at least a portion of the excess printing material 6. When the 3D printed object 1 leaves the printing area, it will carry out a considerable amount of resin material. By using the material recycling container 5 to recycle the excess printing material, the recycled resin material can be used in subsequent 3D printing, thereby avoiding material waste and saving printing costs.

[0159] It should be noted that all the process steps of the post-processing method for 3D printed objects provided in the embodiments of the present invention are based on a post-processing device for 3D printed objects in the above embodiments. The working principles and beneficial effects of the two are one-to-one, so they will not be described again.

[0160] The present invention also provides a post-processing method for 3D printed objects, comprising:

[0161] A 3D printed object 1 carrying excess printing material 6;

[0162] In the first time period, the 3D printed object 1 is placed at the first drop position to separate the excess printing material 6 adhering to the 3D printed object 1; wherein, the tilt angle of the 3D printed object 1 at the first drop position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1.

[0163] In one embodiment, the process of determining the tilt angle at the first drop position includes: determining the optimal drop angle based on a preset angle matching model and the shape features of the 3D printed object 1; and obtaining the tilt angle of the 3D printed object 1 at the first drop position according to the optimal drop angle.

[0164] In one embodiment, the first droplet position is the droplet position with the opening of the liquid accumulation region facing downwards; wherein, the liquid accumulation region is formed by the structure of the 3D printed object itself.

[0165] It should be noted that all the process steps of the post-processing method for 3D printed objects provided in the embodiments of the present invention are based on a post-processing device for 3D printed objects in the above embodiments. The working principles and beneficial effects of the two are one-to-one, so they will not be described again.

[0166] The present invention also provides a 3D printing system, including a 3D printer and a post-processing device for 3D printed objects as described in any of the above embodiments; the post-processing device is set independently or integrated with the 3D printer.

[0167] It should be noted that the post-processing device can be integrated into the 3D printer. After 3D printing is completed, the 3D printed object 1 is moved to the receiving mechanism 2 by an automatic scraping mechanism, and then liquid is dripped. This achieves automatic scraping and automatic liquid dripping, greatly saving labor costs. Of course, the post-processing device can also be set up independently, and this invention does not limit this.

[0168] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0169] (1) In this embodiment of the invention, changing the dripping position of the 3D printed object 1 can change the tilt angle of the 3D printed object 1. By adjusting the dripping angle, the entire dripping process is not fixed at a single dripping position, which can better separate excess printing material on the 3D printed object and improve the efficiency of separating excess resin.

[0170] (2) In this embodiment of the invention, it is applicable to special structures such as inverted cup structure and concave structure, which can achieve better resin separation effect and reduce solvent consumption and cleaning time during subsequent cleaning. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, and this invention does not limit this.

[0171] (3) In this embodiment of the invention, by means of dynamic temperature control, the viscosity of excess printing material can be reduced, the separation efficiency of excess printing material 6 can be improved, and the deformation of 3D printed object 1 caused by excessive temperature can be avoided. It can also be adapted to different printing materials. In some embodiments, by using heated gas to control the temperature of the area, the temperature distribution of the area where the 3D printed object 1 is located can be made uniform, the resin separation efficiency can be improved, and the deformation of the object caused by excessive temperature in some areas can be avoided.

[0172] (4) In this embodiment of the invention, excess printing material is recycled by setting up a material recycling container 5. The recycled resin material can be used in subsequent 3D printing, thereby avoiding material waste and saving printing costs.

[0173] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0174] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0175] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0176] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0177] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0178] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A post-processing apparatus, characterized in that, Applied to a 3D printing device, the 3D printing device includes a forming platform (111) having a forming surface, and the post-processing device includes: The receiving mechanism (2) is used to carry the 3D printed object (1) with excess printing material separated from the molding surface. The receiving mechanism (2) includes a receiving body (21), which has an opening (210), a liquid outlet (211), and a receiving cavity (212) for accommodating the 3D printed object (1). The opening (210) and the liquid outlet (211) are both connected to the receiving cavity (212). Movable mechanism (3), the movable mechanism (3) includes a first transmission mechanism (311), the first transmission mechanism (311) is driven to be connected to the receiving body (21) so that the receiving body (21) changes position by rotation at least twice; The first transmission mechanism (311) is configured to perform the following operations after the receiving mechanism (2) carries the 3D printed object (1) with excess printing material separated from the forming surface: The receiving body (21) is rotated so that the 3D printed object (1) is rotated to the first drop position, and the 3D printed object (1) is controlled to remain at the first drop position for a first preset time. The receiving body (21) is rotated from the first drip position of the 3D printed object (1) to the second drip position. Control the 3D printed object (1) to remain at the second drop position for a second preset time; Wherein, the first drop position and the second drop position are drop positions that are downward-facing, corresponding to the openings of different liquid accumulation areas (11) of the 3D printed object (1), respectively. The first drop position has a first tilt angle, and the second drop position has a second tilt angle. The first tilt angle and the second tilt angle are determined based on the shape characteristics of the 3D printed object (1), and the first tilt angle and the second tilt angle are different. The receiving body (21) is rotated from the second drop position of the 3D printed object (1) so that the 3D printed object (1) is removed from the opening (210) of the receiving body (21).

2. The post-processing apparatus according to claim 1, characterized in that, During the process of the 3D printed object (1) rotating from the first drop position to the second drop position, the movable mechanism (3) rotates the receiving body (21) to control the change of the tilt angle of the 3D printed object (1) once or multiple times, the tilt angle being determined based on the shape characteristics of the 3D printed object (1).

3. The post-processing apparatus according to claim 1 or 2, characterized in that, The movable mechanism (3) is a drive mechanism (31), which is configured to allow the receiving mechanism (2) to rotate from a first state to a second state, wherein the dripping positions of the 3D printed object (1) corresponding to the first state and the second state are different.

4. The post-processing apparatus according to claim 3, characterized in that, The 3D printing equipment includes a material tray (112) and a separation device (113), the forming surface is used to attach the 3D printed object (1), and the separation device (113) is used to separate the 3D printed object (1) from the forming surface; The receiving body (21) is configured to allow movement between a first position and a second position. The receiving body (21) is configured to receive a 3D printed object (1) with excess printing material in the first position and to allow the receiving body (21) to rotate from the first state to the second state in the second position.

5. The post-processing apparatus according to any one of claims 1-4, characterized in that, The post-processing device further includes at least one of a temperature regulation mechanism (4), an air outlet mechanism, and a vibration mechanism; The temperature regulation mechanism (4) is used to generate a dynamic temperature distribution and / or adjust the temperature of the area where the 3D printed object (1) is located based on a pre-configured temperature control strategy; the air outlet mechanism is used to generate flowing gas so that the 3D printed object (1) is in the flowing gas to accelerate the flow of excess printing material; the vibration mechanism is used to make the 3D printed object (1) vibrate to accelerate the flow of excess printing material.

6. The post-processing apparatus according to any one of claims 1-3, characterized in that, The 3D printing equipment includes a material tray (112) and a separation device (113), the forming surface is used to attach the 3D printed object (1), and the separation device (113) is used to separate the 3D printed object (1) from the forming surface; The 3D printing equipment also includes a conveying assembly (117) for transferring the 3D printed object (1) separated from the molding surface to the receiving body (21).

7. The post-processing apparatus according to any one of claims 1-4, characterized in that, The first transmission mechanism (311) is driven to connect with the receiving body (21) to drive the receiving body (21) to rotate around the transverse axis.

8. The post-processing apparatus according to claim 7, characterized in that, The first transmission mechanism (311) includes a motor, a synchronous belt, and a rotating shaft. The motor is located on one side of the receiving body (21), the output end of the motor is connected to one end of the synchronous belt, and the other end of the synchronous belt is connected to the rotating shaft, which is located on the receiving body (21); or, The first transmission mechanism (311) includes a motor and a rotating shaft. The motor is located on one side of the receiving body (21), and the output end of the motor is connected to the rotating shaft, which is located on the receiving body (21).

9. The post-processing apparatus according to claim 4, characterized in that, The drive mechanism (31) further includes a sliding component (312), which can drive the receiving body (21) to move between the first position and the second position.

10. The post-processing apparatus according to claim 4, characterized in that, The receiving body (21) includes a cover plate (22), which is openable and closable in the opening (210); a stop (221) is provided on the cover plate (22), and when the receiving body (21) moves to the first position, the stop (221) abuts against the outer shell of the three-dimensional printing equipment, and a return spring is provided between the cover plate (22) and the receiving body (21).

11. The post-processing apparatus according to claim 9, characterized in that, The sliding assembly (312) includes a first motor, a second motor, a slide table (3121), and a connecting rod (3122). The first motor is used to drive the slide table (3121) to move the receiving body (21) between the first position and the second position. The connecting rod (3122) is disposed on the slide table (3121), and the receiving body (21) is rotatably disposed on the connecting rod (3122). The second motor is used to drive the receiving body (21) to rotate relative to the connecting rod (3122), so that the receiving body (21) rotates from the first state to the second state in the second position.

12. The post-processing apparatus according to any one of claims 1-4, characterized in that, The receiving body (21) includes a side (213) and a bottom (214). One end of the side (213) is connected to the bottom (214). The opening (210) of the receiving body (21) is located on the side of the receiving body (21) opposite to the bottom (214). The liquid outlet (211) is located on the side (213) and / or the bottom (214).

13. The post-processing apparatus according to claim 12, characterized in that, The structure of the receiving body (21) includes one of the following: square, spherical, hemispherical, V-shaped, and funnel-shaped structures. The liquid outlet (211) includes one or more of the following: round hole, square hole, triangular hole, and strip-shaped opening.

14. The post-processing apparatus according to claim 12, characterized in that, The cross-sectional area of ​​the receiving body (21) gradually decreases from top to bottom.

15. The post-processing apparatus according to any one of claims 1-4, characterized in that, The receiving body (21) includes an oleophobic layer or a hydrophobic layer.

16. The post-processing apparatus according to claim 7, characterized in that, The receiving mechanism (2) further includes a first liquid receiving container (23) configured to receive printing material from the receiving body (21).

17. The post-processing apparatus according to claim 16, characterized in that, The receiving mechanism (2) further includes: The receiving container (25) is located below the first liquid receiving container (23). The first transmission mechanism (311) can rotate the receiving body (21) so that the 3D printed object (1) moves out from the opening (210) of the receiving body (21) and enters the receiving container (25) through the opening of the receiving container (25). The second transmission mechanism (24) is capable of driving the first liquid receiving container (23) to move relative to the receiving container (25) to allow the 3D printed object (1) to enter the receiving container (25) through the opening of the receiving container (25).

18. The post-processing apparatus according to claim 16, characterized in that, The receiving mechanism (2) further includes: The receiving container (25) is located to the side of the receiving body (21); The transfer receiving container (28) is equipped with a first transmission mechanism (311) that can rotate the receiving body (21) to move the 3D printed object (1) out of the opening (210) of the receiving body (21) and into the transfer receiving container (28); A toggle mechanism (291) and a third transmission mechanism (292) are provided. The toggle mechanism (291) is located in the transfer receiving container (28). The third transmission mechanism (292) can drive the toggle mechanism (291) to move the 3D printed object (1) out of the transfer receiving container (28) and into the receiving container (25) through the opening of the receiving container (25).

19. The post-processing apparatus according to claim 17 or 18, characterized in that, The receiving container (25) is equipped with a material full sensor, which is used to detect whether the printed object in the receiving container (25) has piled up to a predetermined height or whether the printed object in the receiving container (25) has reached a predetermined weight.

20. The post-processing apparatus according to claim 16, characterized in that, The receiving mechanism (2) further includes: The second liquid receiving container (26) is used to connect the material recycling container (5); The opening of the second liquid receiving container (26) is connected to the first liquid receiving container (23); and / or, a liquid receiving track (27) is provided between the second liquid receiving container (26) and the 3D printing device.

21. A three-dimensional printing device, characterized in that, The 3D printing equipment includes the post-processing device according to any one of claims 1 to 20, and the 3D printing equipment further includes: The material tray (112) is used to hold printing materials; A molding platform (111) has a molding surface and is used to adhere the printing material layer by layer to the molding surface to obtain a 3D printed object; A separation device (113) is used to separate the 3D printed object (1) from the molding surface, wherein the separation device (113) includes one of a scraper mechanism, an extrusion mechanism, an ejection mechanism or a laser cutting mechanism.

22. The three-dimensional printing device according to claim 21, characterized in that, The 3D printing equipment also includes a conveying assembly (117) for transferring the 3D printed object (1) separated from the molding surface to the receiving body (21) of the post-processing device; the conveying assembly (117) has a first position that moves above the tray (112) and a second position that moves above the receiving body (21) to transfer the 3D printed object (1) into the receiving body (21).

23. The three-dimensional printing device according to claim 21, characterized in that, The 3D printing equipment also includes a pipeline for conveying printing material into a tray (112), one end of which is connected to the material recycling container (5) of the post-processing device, and the other end is connected to the tray (112).

24. A system for three-dimensional printing, comprising at least one three-dimensional printing device and a post-processing device as claimed in any one of claims 1 to 21.

25. A post-processing method for 3D printed objects, characterized in that, include: The 3D printed object (1) with excess printing material separated from the molding platform is placed in the receiving cavity (212) of the receiving body (21), which has an opening (210) and a liquid outlet (211), both of which are connected to the receiving cavity (212). The receiving body (21) is driven to rotate around the transverse axis by the first transmission mechanism (311), and the 3D printed object (1) is adjusted to the first drop position and held at the first drop position for a first preset time. The material receiving body (21) is driven by the first transmission mechanism (311) to continue rotating around the transverse axis, thereby rotating the 3D printed object (1) from the first drip position to the second drip position, and controlling the tilt angle of the 3D printed object (1) to be changed once or multiple times during the rotation. Control the 3D printed object (1) to remain at the second drop position for a second preset time; Wherein, the first drop position and the second drop position are drop positions that are downward-facing, corresponding to the openings of different liquid accumulation areas (11) of the 3D printed object (1), respectively. The first drop position has a first tilt angle, and the second drop position has a second tilt angle. The first tilt angle and the second tilt angle are determined based on the shape characteristics of the 3D printed object (1), and the first tilt angle and the second tilt angle are different. The receiving body (21) is driven to rotate by the first transmission mechanism (311), so that the 3D printed object (1) is moved out from the opening (210) of the receiving body (21).

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