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

Abstract

The invention provides a post-processing device, three-dimensional printing equipment and a system used for three-dimensional printing, the post-processing device is applied to the three-dimensional printing equipment, and the post-processing device comprises a material receiving mechanism used for bearing a 3D printing object with redundant printing materials; the movable mechanism is used for enabling the liquid dropping position of the 3D printing object to change and enabling the redundant printing material to drop from the 3D printing object, and the 3D printing object has at least two different inclination angles in the liquid dropping position changing process; or the movable mechanism is used for arranging the 3D printing object at the first liquid dropping position in the first time period so as to separate the redundant printing material attached to the 3D printing object, and the inclination angle of the 3D printing object in the first liquid dropping position is determined based on the preset angle value and / or the shape characteristics of the 3D printing object. Through the technical scheme provided by the invention, the problems of poor separation effect and low efficiency of a mode for separating redundant printing materials in the prior art can be solved.

Description

Technical Field

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

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

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

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

[0005] The present invention provides a post-processing device, a three-dimensional printing device and a system for three-dimensional printing, so as to solve the problem that the separation effect of the method of separating excess printing materials in the prior art is poor and the efficiency is low.

[0006] According to one aspect of the present invention, there is provided a post-processing device, which is applied to a three-dimensional printing device. The post-processing device includes: a material receiving mechanism, which is used to carry a 3D printed object with excess printing material; a movable mechanism, which is used to change the dripping position of the 3D printed object so that the excess printing material drips from the 3D printed object, and the 3D printed object has at least two different inclination angles during the change of the dripping position; or, the movable mechanism is used to set the 3D printed object at a first dripping position in a first time period to separate the excess printing material adhering 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.

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

[0008] According to another aspect of the present invention, a post-processing device is provided, which is applied to a three-dimensional printing device. The post-processing device includes: a material receiving mechanism, which is configured to carry a 3D printed object with excess printing material; and a driving mechanism, which is configured to allow the material receiving mechanism to rotate from a first state to a second state so that the excess printing material drips from the 3D printed object, wherein the 3D printed object has at least two different inclination angles.

[0009] Further, the driving mechanism is configured to keep the material receiving mechanism in the first state for a first period of time.

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

[0011] Furthermore, the post-processing device also includes at least one of a temperature regulating mechanism, an air outlet mechanism, and a vibration mechanism; wherein the temperature regulating mechanism is used to generate a dynamic temperature distribution and / or adjust 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 placed in the flowing gas to accelerate the flow of excess printing material; 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 device includes a molding platform, a material tray and a separation device, the molding platform has a molding surface, the molding surface is used to attach the 3D printed object, and the separation device is used to separate the 3D printed object from the molding surface; the material receiving body is configured to allow movement between a first position and a second position, the material receiving body is configured to receive the 3D printed object with excess printing material at the first position, and allow the material receiving body to rotate from the first state to the second state at the second position.

[0013] Furthermore, the 3D printing device includes a molding platform, a material tray and a separation device, the molding platform has a molding surface, the molding surface is used to attach the 3D printed object, and the separation device is used to separate the 3D printed object from the molding surface; the 3D printing device also includes a conveying component, the conveying component is used to transfer the 3D printed object separated from the molding surface to the material receiving body.

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

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

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

[0017] Furthermore, the material receiving body includes a cover plate, which is openably arranged at the opening; a stopper is arranged on the cover plate, and when the material receiving body moves to the first position, the stopper abuts and cooperates with the shell of the three-dimensional printing device, and a return spring is arranged between the cover plate and the material receiving body.

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

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

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

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

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

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

[0024] Furthermore, the material receiving mechanism also includes: a material receiving container, located below the first liquid receiving container, the first transmission mechanism can rotate the material receiving body so that the 3D printed object moves out of the opening of the material receiving body and enters the material receiving container through the opening of the material receiving container; the second transmission mechanism can drive the first liquid receiving container to move relative to the material receiving container to allow the 3D printed object to enter the material receiving container through the opening of the material receiving container.

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

[0026] Furthermore, the material receiving container is provided with a material full sensor, and the material full sensor is used to detect whether the printing objects in the material receiving container are piled up to a predetermined height or detect whether the printing objects in the material receiving container reach a predetermined weight.

[0027] Furthermore, the material receiving mechanism also includes: a second liquid receiving container, the second liquid receiving container is used to connect to the material recovery 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 three-dimensional printing device.

[0028] According to another aspect of the present invention, a three-dimensional printing device is provided, the three-dimensional printing device includes the post-processing device provided above, and the three-dimensional printing device also includes: a material tray for holding printing materials; a molding platform, having a molding surface and used to adhere the printing materials to the molding surface layer by layer to obtain a 3D printed object; a separation device, used to separate the 3D printed object from the molding surface, wherein the separation device includes one of a shoveling mechanism, an extruding mechanism, an ejection mechanism or a laser cutting mechanism.

[0029] Furthermore, the 3D printing device also includes a conveying component, which is used to transfer the 3D printed object separated from the molding surface to a material receiving body of the post-processing device; the conveying component has a first position that moves to above the material tray and a second position that moves to above the material receiving body to transfer the 3D printed object to the material receiving body.

[0030] Furthermore, the three-dimensional printing device also includes a pipeline for conveying the printing material to the material tray, one end of the pipeline is connected to the material recovery container of the post-processing device, and the other end is connected to the material tray.

[0031] According to yet 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 apparatus as provided above.

[0032] The technical solution of the present invention is applied, and the post-processing device includes a material receiving mechanism and a movable mechanism. The movable mechanism is used to change the dripping position of the 3D printed object, and the 3D printed object has at least two different tilt angles during the change of the dripping position, so that the excess printing material drips from the 3D printed object. Alternatively, the 3D printed object is set at the first dripping position in the first time period by the movable mechanism to separate the excess printing material adhering to the 3D printed object. In the above manner, by adjusting the dripping angle, the entire dripping process is not fixed at a single dripping position, which can better separate the excess printing material on the 3D printed object and improve the efficiency of separating the excess resin. Since the tilt angle of the 3D printed object in the first dripping position is determined based on the preset angle value and / or the shape characteristics of the 3D printed object, the excess printing material on the 3D printed object can also be better separated, and the efficiency of separating the excess resin can be improved. At the same time, through the device provided by the present invention, a better resin separation effect can be achieved, the solvent consumption and cleaning time during the later cleaning are reduced, and the separated resin can also be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 A schematic diagram of the structure of a post-processing device 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 in an embodiment of the present invention is shown;

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

[0037] Figure 4 It shows a schematic structural diagram of a material receiving body of a post-processing device provided according to an embodiment of the present invention;

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

[0039] Figure 6 Another structural schematic diagram of the material receiving body of the post-processing device provided in an embodiment of the present invention is shown;

[0040] Figure 7 A schematic diagram showing another structure and another use state of a material receiving body of a post-processing device provided in an embodiment of the present invention is shown;

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

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

[0043] Fig.10 It is a right view of the material receiving mechanism and the 3D printed object provided by the embodiment of the present invention;

[0044] Fig.11 It is a schematic diagram of the structure of a 3D printed object;

[0045] Fig.12 is a schematic diagram of cleaning excess resin by centrifugation in the prior art;

[0046] Fig.13 Another front view of a post-processing device provided according to an embodiment of the present invention is shown;

[0047] Fig.14 It is a structural schematic diagram of a material receiving mechanism provided in an embodiment of the present invention;

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

[0049] Fig.16 is a schematic diagram of dynamic temperature distribution provided by an embodiment of the present invention;

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

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

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

[0053] Fig. 20 It is a schematic diagram of centrifugal force.

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

[0055] 1. 3D printed object; 11. liquid accumulation area; 2. material receiving mechanism; 21. material receiving body; 210. opening; 211. liquid outlet; 212. accommodating chamber; 213. side; 214. bottom; 22. cover plate; 221. stopper; 23. first liquid receiving container; 24. second transmission mechanism; 241. sector gear; 242. rack; 25. material receiving container; 26. second liquid receiving container; 27. liquid receiving track; 28. transfer receiving container; 291. toggle mechanism; 292. third transmission mechanism; 3. movable mechanism ; 31. Driving mechanism; 311. First transmission mechanism; 312. Sliding assembly; 3121. Slide; 3122. Connecting rod; 4. Temperature regulating mechanism; 41. Air outlet assembly; 42. Heat source; 43. Guide rail; 44. Temperature sensor; 5. Material recovery container; 6. Excess printing material; 111. Forming platform; 112. Material tray; 113. Separation device; 114. Lifting mechanism; 115. Platform mounting structure; 116. Light source; 117. Conveying assembly; 1171. Receiving member; 1172. Material shifting member. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] like Figures 1 to 10 As shown, an embodiment of the present invention provides a post-processing device, which is applied to a three-dimensional printing device. The post-processing device includes a material receiving mechanism 2 and a movable mechanism 3. The material 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 the excess printing material drips from the 3D printed object 1. The 3D printed object 1 has at least two different inclination angles during the change of the dripping position; or, the movable mechanism 3 is used to set the 3D printed object 1 at a first dripping position in a first time period to separate the excess printing material adhering to the 3D printed object 1. The inclination angle of the 3D printed object 1 in the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1.

[0058] The post-processing device provided in this embodiment is applied, and the movable mechanism 3 is used to change the dripping position of the 3D printed object 1 so that the excess printing material drips from the 3D printed object 1. Alternatively, the movable mechanism 3 is used to set the 3D printed object 1 at the first dripping position in the first time period to separate the excess printing material adhering to the 3D printed object 1. Since the dripping angle is adjusted, the entire dripping process is not fixed at a single dripping position, and the excess printing material 6 on the 3D printed object 1 can be better separated. Since the inclination angle of the 3D printed object 1 in the first dripping position is determined based on the preset angle value and / or the shape characteristics of the 3D printed object 1, the excess printing material 6 on the 3D printed object 1 can also be better separated, and the efficiency of separating the excess resin is improved. At the same time, through the device provided by the present invention, a better resin separation effect can be achieved, the solvent consumption and cleaning time during the later cleaning are reduced, and the separated resin can also be recycled.

[0059] Specifically, the excess printing material 6 on the 3D printed object 1 after dripping is reduced, which can make the post-process (such as the cleaning process) easier, save the solvent consumption of post-cleaning, and of course can also be connected to solvent-free cleaning (centrifugation, vacuum, etc.). In addition, in some scenarios, most of the resin on the 3D printed object 1 after dripping has been removed, and the 3D printed object can also be directly re-cured to reduce the post-processing process.

[0060] In the prior art, the industry mostly adopts the solution of dripping liquid by self-weight. After printing is completed, the 3D printed object is placed on the platform for a period of time before taking out the 3D printed object, or the platform with the 3D printed object is placed at an angle to facilitate the resin to flow back to the material tray. However, the whole process is completed on the printer, which is not only inefficient and the amount of recycled resin is small, but also because the printer and platform are occupied, the equipment utilization rate is low, affecting the overall production rhythm. The post-processing device provided in this embodiment can accelerate and increase the recycling of resin without occupying the 3D printer.

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

[0062] Among them, the movable mechanism 3 can adopt a toggle rod structure to directly toggle the 3D printed object to change the angle of the 3D printed object, so as to achieve dripping of at least 2 different angles of the 3D printed object. This method does not need to drive the material receiving mechanism to rotate. Alternatively, the dripping of the resin is accelerated by partial external force, such as wind blowing, slight centrifugal vibration, shaking, rotational acceleration centrifugation, and deflection. The goal is to make the resin drip more fully. It is just a slight movement to accelerate the dripping of the resin. The structure is relatively simple and can be automated. Alternatively, the viscosity of the resin is reduced by heating, so that the resin drips more easily. The heating method includes far-infrared light, heated gas, etc. A resin recovery structure can also be added: using a screen, a filter, etc., the recycled resin can be mixed with the new resin in a certain proportion and used again, or used directly.

[0063] Specifically, the angle of the material receiving mechanism is adjusted according to the preset value each time, and the angle can also be adjusted to match the shape of the 3D printed object. After each angle adjustment, start timing, and switch to the next angle after the set time is reached, so that the dripping time at each angle is constant. The set time can be 2, 3, 5 minutes, etc. Before or after adjusting the angle, auxiliary heating can be performed. By setting a temperature sensor, the heating source can be turned on or off in time. Before or after adjusting the angle, the blowing mechanism (wind knife, air gun, etc.) can be turned on to blow air to the 3D printed object. The blowing time can also be set.

[0064] In this embodiment, the movable mechanism 3 is a driving mechanism 31, and the driving mechanism 31 is configured to allow the material receiving mechanism 2 to rotate from the first state to the second state, so that the excess printing material drips from the 3D printed object 1, wherein the 3D printed object 1 has at least two different inclination angles. When the material receiving mechanism 2 rotates from the first state to the second state, the 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, interval switching, etc. The dripping position or tilt angle of the 3D printed object 1 corresponding to the first state and the second state is different. In other words, during the rotation of the material receiving mechanism 2 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 from the 3D printed object 1. Exemplarily, the 3D printed object 1 is maintained at at least one dripping position for a preset time; or the 3D printed object 1 is continuously switched between several of the dripping positions; or the 3D printed object 1 is maintained at at least one dripping position for a preset time and continuously switched between several of the dripping positions.

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

[0067] It can be understood that, in one implementation, the first state corresponds to the first dripping position, that is, when the material receiving mechanism 2 is in the first state, the 3D printed object 1 is set at the first dripping position to separate the excess printing material adhering to the 3D printed object 1, and the inclination angle of the 3D printed object 1 in the first dripping position is determined based on a preset angle value and / or the shape characteristics of the 3D printed object 1.

[0068] like Figure 1 , Figure 2 As shown, an embodiment of the present invention provides a post-processing device, which is applied to a three-dimensional printing device. The three-dimensional printing device includes a molding platform 111, a material tray 112 and a separation device 113. The molding platform 111 has a molding surface, and the molding surface is used to attach a 3D printed object 1. The molding platform 111 is installed on a lifting mechanism 114 through a platform mounting structure 115. The light source 116 can irradiate the material tray 112. The structure of the three-dimensional printing device is shown in FIG. Fig.19 As shown. The post-processing device includes a material receiving mechanism 2 and a driving mechanism 31. The material receiving mechanism 2 is configured to carry a 3D printed object 1 with excess printing material, and the driving mechanism 31 is configured to allow the material receiving mechanism 2 to rotate from a first state to a second state. When the material receiving mechanism 2 rotates from the first state to the second state, the 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, and the excess printing material 6 on the 3D printed object 1 can be better separated, while improving the efficiency of separating excess resin.

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

[0070] In one embodiment, the three-dimensional printing device can automatically transfer the printed 3D printed object to the material receiving body 21. Specifically, the three-dimensional printing device also includes a separation device 113 and a conveying component 117. The separation device 113 is used to separate the 3D printed object 1 from the molding surface, and the conveying component 117 is used to transfer the 3D printed object 1 separated from the molding surface to the material receiving body 21. For ease of understanding, the separation device 113 is described below using a shovel mechanism as an example. In other embodiments, the separation device 113 can also use an extrusion mechanism, an ejection mechanism, or a laser cutting mechanism, etc., which is not limited to this.

[0071] Specifically, Figure 2 As shown, the shovel mechanism may be located between the molding platform and the material tray, and may be used to automatically separate the 3D printed object from the molding surface after printing is completed, so that the molding platform can continue to be used to print the next 3D printed object without the operator having to manually remove the molding platform from the printer to perform the shovel operation. The conveying assembly 117 is used to transfer the 3D printed object 1 separated from the molding surface to the material receiving body 21, so as to facilitate the subsequent separation of excess printing material 6 on the 3D printed object 1 using the material receiving body 21. The shovel mechanism may include a shovel blade assembly and a shovel drive assembly. Among them, the shovel blade assembly may include a shovel blade. The shovel drive assembly may be used to drive at least one of the shovel blade and the molding platform, so that the shovel blade and the molding platform can move relative to each other, so as to peel the 3D printed object from the molding surface by the shovel blade.

[0072] Furthermore, the conveying assembly 117 includes a conveying drive assembly and a receiving member 1171. The conveying drive assembly is used to drive the receiving member 1171 to move between the receiving position and the discharging position, so as to cooperate with the shoveling mechanism to automatically shovel and transfer the 3D printed objects adhered to the molding platform, thereby realizing the unattended full-automatic shoveling and receiving of the printer. In this embodiment, the receiving member 1171 has a receiving space for accommodating 3D printed objects, so that it can be basket-shaped or box-shaped, and a discharging port connected to the receiving space is provided on one side of the receiving member 1171, and the discharging port can be used for the 3D printed objects to be removed from the receiving member 1171. Of course, in other optional embodiments of the present application, the receiving member 1171 can have different structural forms, such as a plate-shaped, as long as it can play the role of receiving 3D printed objects.

[0073] Furthermore, the conveying assembly 117 may also include a material-dispensing member 1172, which may be used to dispense the 3D printed object in the receiving member 1171 to the receiving body 21, thereby releasing the receiving space, so that the receiving member 1171 can continue to carry other 3D printed objects. The material-dispensing member 1172 may include a material-dispensing portion, which is used to dispense the 3D printed object in the receiving space during the dispensing stage, so as to dispense it out of the material outlet.

[0074] like Figure 1 As shown, the material 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 material receiving body 21 is arranged on a side of the material receiving body 21 opposite to the bottom portion 214, and the liquid outlet 211 is arranged on the side portion 213 and / or the bottom portion 214. The 3D printed object 1 can enter from the opening 210 on one side of the material receiving body 21, and the excess printing material 6 on the 3D printed object 1 can drip 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 drivingly connected to the material receiving body 21 to drive the material receiving body 21 to rotate around the transverse axis. During the rotation of the material receiving body 21, or after the material receiving body 21 changes position by rotation, the excess printing material 6 on the 3D printed object 1 can be separated.

[0076] In one embodiment, if Figure 1 As shown, the first transmission mechanism 311 includes a motor, a synchronous belt and a rotating shaft, the motor is arranged at one side of the material receiving body 21, 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 arranged on the material receiving body 21. When the motor rotates, the synchronous belt is driven to rotate, and the synchronous belt can drive the rotating shaft to rotate, so that the rotating shaft drives the material receiving body 21 to rotate, and then drives the material receiving body 21 to rotate around the transverse axis.

[0077] In one embodiment, if Figure 3 As shown, the first transmission mechanism 311 includes a motor and a rotating shaft, the motor is arranged at one side of the material receiving body 21, the output end of the motor is connected to the rotating shaft, and the rotating shaft is arranged on the material receiving body 21. The motor directly drives the rotating shaft to rotate, thereby using the rotating shaft to drive the material receiving body 21 to rotate, and then realizes driving the material receiving body 21 to rotate around the transverse axis. Using the direct drive method of the motor can simplify the drive structure.

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

[0079] In one embodiment, the cross-sectional area of ​​the material 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 material receiving body 21, so that the excess printing material 6 can drip through the liquid outlet 211.

[0080] It should be noted that if Figure 4 , Figure 5As shown, the structure of the material receiving body 21 includes one of square, spherical, hemispherical, V-shaped, and funnel-shaped structures, and the liquid outlet 211 includes one or more of a circular hole, a square hole, a triangular hole, and a strip-shaped opening. The structure 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.

[0081] In one embodiment, the material receiving body 21 includes an oleophobic layer or a hydrophobic layer. By adjusting the polarity of the material, the polarities of the test printing consumables and the material receiving body 21 are repelled. For example, if the resin is oily, an oleophobic material, i.e., an oleophobic layer, can be provided on the surface of the material 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 material receiving body 21. Alternatively, the material receiving body 21 can be made directly of an oleophobic / hydrophobic material.

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

[0083] In one embodiment, if Figure 1 , Figure 2 As shown, the material receiving mechanism 2 also includes a material receiving container 25 and a second transmission mechanism 24. The material receiving container 25 is located below the first liquid receiving container 23. The first transmission mechanism 311 can rotate the material receiving body 21 to allow the 3D printed object 1 to move out of the opening 210 of the material receiving body 21 and enter the material receiving container 25 through the opening of the material receiving container 25, so that the 3D printed object 1 in the material receiving body 21 is received by the material receiving container 25, completing the fully automated process of taking out-drip-recovery. The second transmission mechanism 24 can drive the first liquid receiving container 23 to move relative to the material receiving container 25 to allow the 3D printed object 1 to enter the material receiving container 25 through the opening of the material receiving container 25, so as to avoid being blocked by the first liquid receiving container 23 during the process of the 3D printed object 1 entering the material 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 material receiving body and the first liquid receiving container respectively), or 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, and the sector gear and the synchronous wheel are fixed on the same axis, and the synchronous movement of the two transmission mechanisms is achieved through a unified drive motor.

[0086] In one embodiment, referring to Figure 3The material receiving mechanism 2 also includes a material receiving container 25, a transfer receiving container 28, a toggle mechanism 291 and a third transmission mechanism 292. The material receiving container 25 is located on the side of the material receiving body 21, and the first transmission mechanism 311 can rotate the material receiving body 21 to move the 3D printed object 1 out of the opening 210 of the material receiving body 21 and into the transfer receiving container 28. The toggle mechanism 291 is arranged in the transfer receiving container 28, and 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 enter the material receiving container 25 through the opening of the material receiving container 25, completing the fully automated process of picking up-drip-recovery. By setting the transfer receiving container 28, the 3D printed object 1 is transferred using the transfer receiving container 28, which has the advantage of flexible transportation.

[0087] It should be noted that the material receiving container 25 can also be equipped with a full material sensor, which is used to detect whether the printed objects in the material receiving container 25 are stacked to a predetermined height, or detect whether the printed objects in the material receiving container 25 reach a predetermined weight. In this way, it can be determined whether the printed objects need to be transported based on the stacking height or total weight of the printed objects in the material receiving container 25.

[0088] Among them, Figure 2 As shown, the material receiving mechanism 2 also includes a second liquid receiving container 26, which is used to connect to the material recovery container 5. The opening of the second liquid receiving container 26 is connected to the first liquid receiving container 23, and the excess printing material 6 from the 3D printed object 1 received by the first liquid receiving container 23 can enter the second liquid receiving container 26 to achieve the recycling of the printing material. A liquid receiving track 27 is provided between the second liquid receiving container 26 and the three-dimensional printing device. The liquid receiving track 27 is used to guide the resin dripping during the shovel piece connection process into the second liquid receiving container 26. The recovered resin can be filtered and then used, or mixed with new resin in proportion and then used.

[0089] Specifically, there are various ways to recycle resin. Since the resin recovered after draining is close to the reaction area, its material properties are slightly different from those of new resin. When it is reused, the recycled resin and new resin can be mixed and reused according to the actual needs of 3D printed objects. When the method of centralized reuse after collection is adopted, it is necessary to control different proportions of mixing or not mixing and reuse according to actual needs. When it is directly transported back to the printer for recycling after draining, since there is new resin in the tray, there is no need to consider mixing separately.

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

[0091] The material receiving body 21 includes a cover plate 22, which can be opened and closed at the opening 210 of the material receiving body 21. A stopper 221 is provided on the cover plate 22, and a return spring is provided between the cover plate 22 and the material receiving body 21. When the material receiving body 21 moves to the first position, the stopper 221 abuts against the housing of the three-dimensional printing device, and the cover plate 22 stops moving, so that the cover plate 22 is opened. When the material receiving body 21 leaves the first position, the cover plate 22 is closed under the action of the return spring elastic force. At this time, the cover plate 22 can cover the opening 210 to prevent the 3D printed object 1 from falling from the opening 210 of the material receiving body 21.

[0092] In an optional embodiment, a magnetic member is provided on the stopper 221. The magnetic member can cooperate with the 3D printing device by magnetic attraction, thereby making the position of the cover plate more stable. The stopper 221 and the magnetic attraction method are used to realize the opening and closing of the cover plate 22, which has the advantages of simple structure and high reliability. In other embodiments, pneumatic clamps or electric clamps can also be used to drive the cover plate 22 to move.

[0093] It should be noted that if the method without a cover plate is adopted, the rotation angle and dripping angle of the material receiving body 21 need to be controlled during the draining process, and the angle during the draining process is limited by position detection to prevent the 3D printed object from falling out during the dripping process.

[0094] In one embodiment, the driving mechanism 31 further includes a sliding assembly 312, and the sliding assembly 312 can drive the material receiving body 21 to move between the first position and the second position. The sliding method can improve the stability of the material receiving body 21 when moving.

[0095] Specifically, Figure 8As shown, the sliding assembly 312 includes a first motor, a second motor, a slide 3121 and a connecting rod 3122. The first motor is used to drive the slide 3121 to drive the material receiving body 21 to move between the first position and the second position, so as to achieve the position switching of the material receiving body 21. The connecting rod 3122 is arranged on the slide 3121, and the material receiving body 21 can be rotatably arranged on the connecting rod 3122. The second motor is used to drive the material receiving body 21 to rotate relative to the connecting rod 3122, so that the material receiving body 21 rotates from the first state to the second state at the second position, so that the excess printing material can drip from 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 embodiment and will not be repeated here.

[0096] By adopting the above-mentioned implementation mode, the dripping angle is adjusted so that the entire dripping process is not fixed at a single dripping position, so that the excess printing material on the 3D printed object can be better separated, and the efficiency of separating the excess resin is improved. At the same time, the device provided by the present invention can achieve a better resin separation effect, reduce the solvent consumption and cleaning time during the later cleaning, and can also recycle the separated resin.

[0097] It should be noted that the correspondence between the post-processing device and the printer can be set up separately or in combination. Specifically, the configuration of the post-processing device and the printer can be varied, and the printer can be used to achieve integrated production. A single printer corresponds to a single set of post-processing devices. In addition to automatically pouring them into the post-processing device after printing, the 3D printed objects from multiple printers can be collected and placed into the material receiving body of one or more sets of post-processing devices through equipment or manual work. The 3D printed objects from one printer can also be placed into the material receiving body of one or more sets of post-processing devices.

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

[0099] Exemplarily, the separation device 113 may include a shovel mechanism, which may be located between the molding platform and the material tray, and may be used to automatically separate the 3D printed object from the molding surface after printing is completed, so that the molding platform can continue to be used to cooperate with the printing of the next 3D printed object without the operator manually removing the molding platform from the printer for shoveling operations. For example, the shovel mechanism may include a shovel assembly and a shovel drive assembly. Among them, the shovel assembly may include a shovel. The shovel drive assembly may be used to drive at least one of the shovel and the molding platform so that relative movement can occur between the shovel and the molding platform, so as to peel the 3D printed object from the molding surface by the shovel. For example, the shovel drive assembly may be specifically used to drive the shovel to move, so that the shovel slides on the molding surface of the molding platform, thereby peeling the 3D printed object that has been printed from the molding surface.

[0100] Exemplarily, the separation device 113 may include an ejection mechanism, the ejection mechanism includes a substrate and an ejection element, the ejection element is arranged on the substrate, a through hole is arranged on the molding platform, and the ejection element corresponds to the hole; the ejection drive assembly is arranged to drive the molding platform and the separation device 113 to move from the first position to the second position along the first direction, and to drive the molding platform to move from the second position to the third position along the first direction, wherein at the second position, the substrate of the separation device 113 contacts the limiting device, and during the movement of the molding platform from the second position to the third position, the molding platform moves relative to the substrate, so that the ejection element gradually extends out of the hole of the molding platform. By arranging the ejection element on the substrate, arranging the through hole on the molding platform, and using the cooperation of the ejection drive assembly and the limiting device to make the ejection element pass through the hole to 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 realizing the improvement of the convenience of separation of the 3D printed object and the molding platform in the three-dimensional printing technology.

[0101] In one embodiment, the three-dimensional printing device further includes a conveying component 117, which is used to transfer the 3D printed object 1 separated from the molding surface to the material receiving body 21. The conveying component 117 has a first position that moves to the top of the material tray 112 and a second position that moves to the top of the material receiving body 21 of the post-processing device, so as to transfer the 3D printed object 1 to the material receiving body 21, so as to facilitate the subsequent use of the material receiving body 21 to remove the excess printing material 6 on the 3D printed object 1. Exemplarily, the conveying component 117 includes a conveying drive component and a receiving member 1171, and the conveying drive component is used to drive the receiving member 1171 to move between the material receiving position and the material discharging position, so as to cooperate with the shoveling mechanism or the ejecting mechanism to automatically shovel and transfer the printed 3D printed object adhered to the molding platform, thereby realizing the unattended fully automatic shoveling and receiving of the printer. In this embodiment, the receiving member 1171 has a receiving space for accommodating 3D printed objects, so that it can be basket-shaped or box-shaped, and a discharge port connected to the receiving space is provided on one side of the receiving member 1171, and the discharge port can be used for the 3D printed objects to be removed from the receiving member 1171. Of course, in other optional embodiments of the present application, the receiving member 1171 can have different structural forms, such as a plate-shaped, as long as it can play the role of receiving 3D printed objects. Further, the conveying component 117 may also include a material-dipping member 1172, which can be used to divert the 3D printed objects in the receiving member 1171 to the receiving body 21, thereby releasing the receiving space, so that the receiving member 1171 can continue to carry other 3D printed objects. Among them, the material-dipping member 1172 may include a material-dipping portion, which is used to dig the 3D printed objects in the receiving space during the dipping stage to dig them out of the discharge port.

[0102] In this embodiment, the 3D printing device also includes a pipeline for conveying printing materials to the material tray 112. One end of the pipeline is connected to the material recovery container 5 of the post-processing device, and the other end is connected to the material tray 112, thereby realizing the recycling of printing materials, saving printing materials, and reducing costs.

[0103] Another embodiment of the present invention provides a system for three-dimensional printing, comprising at least one three-dimensional printing device and the above-mentioned post-processing device. Therefore, the 3D printing production system can also better separate the excess printing material 6 on the 3D printed object 1, while improving the efficiency of separating the excess resin.

[0104] In order to facilitate a better understanding of the present invention, the inventive principle of the present invention is further described below.

[0105] like Fig. 9 , Fig.10As shown, the present invention provides a post-processing device for 3D printed objects, comprising: a material receiving mechanism 2, used to carry a 3D printed object 1 with excess printing material 6; a movable mechanism 3, used to change the dripping position of the 3D printed object 1, so that the excess printing material 6 drips from the 3D printed object 1; wherein, the 3D printed object 1 has at least two different tilt angles during the change of the dripping position. In the present invention, the excess printing material 6 drips from the 3D printed object 1 mainly by gravity or the combined force of gravity and other forces (such as wind force, vibration force, etc.), and gravity or the combined force of gravity and other forces drives the excess printing material 6 to leave the surface of the 3D printed object 1.

[0106] It should be noted that the 3D printed object 1 includes a solid or semi-solid polymer, and the excess printing material 6 includes uncured polymer resin. After the 3D printing is completed, due to the properties of the printing material itself, such as the resin material having a certain viscosity, the resin material can adhere to the surface of the 3D printed object 1, resulting in the surface of the 3D printed object 1 being covered with unused polymer resin brought out from the printing area; or, due to the structure of the 3D printed object 1 itself, it is in a fixed position during the molding process, and there will be more liquid accumulation areas on the 3D printed object 1, such as an inverted cup mouth structure, a C-shaped dental mold, a hollow dental mold, etc., and uncured resin materials are likely to exist in these liquid accumulation areas. The presence of these resins will not only cause a large amount of material loss, but also increase the difficulty of subsequent processing, so it is necessary to separate these excess resins from the 3D printed object 1.

[0107] In an embodiment of the present invention, the dripping position of the 3D printed object 1 is changed, and the inclination angle of the 3D printed object 1 can be changed, so that the excess printing material 6 drips from the 3D printed object 1. By adjusting the dripping angle, the entire dripping process is not fixed at a single dripping position, and the excess printing material on the 3D printed object 1 can be better separated, thereby improving the efficiency of separating excess resin. At the same time, the device provided by the present invention can achieve a better resin separation effect, reduce the solvent consumption and cleaning time during the later cleaning, and can also recycle the separated resin. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, and the present invention does not limit this.

[0108] like Fig.10 (a) Fig.10 (b) and Fig.10As shown in (c), the 3D printed object 1 is arranged in the material receiving mechanism 2, and the 3D printed object 1 changes position with the material receiving mechanism 2. The figure shows three different dripping positions of the material receiving mechanism 2 and the 3D printed object 1, which are recorded as dripping position a, dripping position b, and dripping position c. It can be understood that the material receiving mechanism 2 and the 3D printed object 1 have different inclination angles in different dripping positions. Among them, the inclination angle represents the angle of the 3D printed object 1 relative to the vertical direction (Z direction in the figure), and the value range of the inclination angle is -180°~+180°. Exemplarily, the inclination angle is determined based on the bottom edge of the 3D printed object 1 in contact with the material receiving mechanism 2. Exemplarily, the dripping position can be customized based on user needs, for example, the dripping position corresponds to the inclination angle one by one, and the inclination angle changes once each time the dripping position is changed; or the two are set separately, and the inclination angle changes multiple times each time the dripping position is changed. In a specific application, the drop position of the 3D printed object 1 is changed by changing the tilt angle multiple times, which is beneficial to separating the excess printing material on different surfaces and liquid accumulation areas of the 3D printed object 1.

[0109] Furthermore, the movable mechanism 3 is also used to: keep the 3D printed object 1 at at least one dripping position for a preset time; or continuously switch the 3D printed object 1 between several dripping positions; or keep the 3D printed object 1 at at least one dripping position for a preset time and continuously switch between several dripping positions. The preset time t can be 10s, 30s, 1min, 3min, 5min, etc., which is not limited in the present invention.

[0110] It can be understood that the movable mechanism 3 in the present invention is used to control the dripping position of the 3D printed object 1. After changing the dripping position, the 3D printed object 1 can also be kept at any dripping position, that is, the entire dripping process is not fixed at a single dripping position. Exemplarily, the preset times for different dripping positions can be set to be the same or different, for example, after the 3D printed object 1 is maintained at the dripping position a for 1 minute, the 3D printed object 1 is changed to the dripping position b at an arbitrary speed and maintained for 3 minutes, and then the 3D printed object 1 is changed to the dripping position c and maintained for 1 minute; the 3D printed object 1 can also be continuously switched between the dripping positions a, b, and c, for example, the 3D printed object 1 is continuously switched according to abca or acbca; the 3D printed object 1 can also be continuously switched between the dripping positions a and c and maintained at the dripping position b for t time, for example, the 3D printed object 1 is continuously switched between the dripping positions a and c at an arbitrary speed according to acca within the time period t1-t2, and then the 3D printed object 1 is changed to the dripping position b at time t2, and then maintained for t time.

[0111] Reference Fig.11In one embodiment, the movable mechanism 3 is further used to maintain the dripping position of the 3D printed object 1 at the opening of the liquid accumulation area 11 downward for a preset time; wherein the liquid accumulation area 11 is formed by the structure of the 3D printed object 1 itself. In a specific application, if the 3D printed object 1 has a liquid accumulation area 11 caused by a special structure, such as an inverted cup mouth structure, the dripping position of the cup mouth part of the inverted cup mouth structure downward can be recorded as the dripping position b, and then the dripping is performed by staying at the dripping position b for t time and continuously switching to other positions, which can further improve the efficiency of separating excess printing materials.

[0112] like Fig.12 As shown, the method of cleaning excess resin by centrifugation in the prior art is demonstrated. The rotation of the rotor generates a centrifugal force that drives the excess printing material away from the center of rotation and away from the surface of the object. During the centrifugation process, the inclination angle of the 3D printed object 1 does not change. Fig.11 , Fig.12 It can be seen that for some 3D printed objects 1 with special structures, such as an inverted cup mouth structure, a C-shaped dental mold, a hollow dental mold, etc., there will be some liquid accumulation areas 11. When the resin is thrown off by centrifugation, if the opening in the liquid accumulation area 11 is small or the opening is not set downward, the resin in the liquid accumulation area 11 is not easy to fall out. Therefore, the centrifugal method cannot clean the above-mentioned liquid accumulation area 11 very well, which may easily lead to the resin material in the liquid accumulation area not being thrown off, and the effect of centrifugal cleaning is not good. In addition, the speed and time of centrifugal cleaning are not easy to control. For objects with fragile structures, they are easily damaged by long-term centrifugal force. Excessive centrifugal force will cause the equipment to vibrate and make excessive noise, the equipment will be unstable, and the resin will splash and be difficult to collect. Fig. 20 As shown, the direction of the centrifugal force during the centrifugal process is along the tangent direction, and the resin material will fly out along the tangent due to the centrifugal force.

[0113] By using the device of the present invention, the dripping angle is adjusted so that the entire dripping process is not fixed at a single dripping position. The excess printing material is mainly dripped from the 3D printed object by gravity or the combined force of gravity and other forces (such as wind force, vibration force, etc.), which can better separate the excess printing material on the 3D printed object 1, improve the efficiency of separating excess resin, and will not cause damage to the 3D printed object. In the process of resin material dripping, the resin material can fall vertically, and can also fall in a parabola under the action of wind, similar to the process of rain, and the resin material will not fly out.

[0114] In one embodiment, the movable mechanism 3 includes: a driving mechanism 31; the material receiving mechanism 2 is connected to the driving mechanism 31, so that the driving mechanism 31 drives the material receiving mechanism 2 and the dripping position of the 3D printed object 1 to change.

[0115] Specifically, the driving mechanism 31 includes a rotating shaft, such as a rotating shaft of a motor, and the rotating shaft of the motor is connected to the material receiving mechanism 2. The motor drives the 3D printed object 1 to rotate along the A axis to achieve a change in the dripping position of the 3D printed object 1, such as Fig. 9 In some embodiments, the motor drives the 3D printed object 1 to rotate along point B to achieve the change of the dripping position of the 3D printed object 1, such as Fig.13 As shown. Among them, the rotation speed of the motor shaft can be set to a slow speed, that is, much less than the rotation speed of the centrifugal device, such as 50r / min or less than 50r / min or less, such as 5r / min, 10r / min, 15r / min, 20r / min, 30r / min, etc. During the rotation process, the excess printing material is mainly dripped by gravity, and the centrifugal force is basically not used. Of course, the rotation speed can also be set to more than 50r / min according to demand, and the excess printing material is dripped by the combined force of gravity and slight centrifugal force. The present invention does not limit the rotation speed.

[0116] It should be noted that in this embodiment, the rotating shaft of the driving mechanism 31 is configured to be non-parallel to the vertical direction (gravity direction). Optionally, the rotating shaft of the driving mechanism 31 is perpendicular to the vertical direction (gravity direction), which can change the dripping position of the 3D printed object 1, that is, the inclination angle relative to the vertical direction changes. The excess printing material in the present invention is mainly separated by gravity, and the structure is simpler and the separation efficiency is higher.

[0117] Reference Fig.14 The material receiving mechanism 2 includes a material receiving body 21, which has an opening 210, a liquid outlet 211 and a receiving cavity 212 for receiving a 3D printed object, wherein the opening 210 is connected to the receiving cavity 212, and the liquid outlet 211 is connected to the receiving cavity 212. One or more 3D printed objects 1 are placed in the receiving cavity 212, and the excess printing materials can be separated individually or in large quantities at the same time. Furthermore, the material receiving mechanism 2 also includes a cover plate 22, which is arranged opposite to the opening 210, and the cover plate 22 is arranged on the material receiving body 21 to open or close the opening 210. The cover plate 22 can be connected to the material receiving body 21 by magnetic attraction or snap-on, which is not limited in the present invention.

[0118] It is understandable that, when the cover plate 22 is added, the cover plate 22 prevents the 3D printed object 1 from falling out of the material receiving mechanism 2 during the rotation process, thereby increasing the tilt angle range of the 3D printed object 1. Exemplarily, the material receiving mechanism 2 includes a net bag structure, the net bag can be made of metal material, the top of the net bag has an opening 210 and a cover plate 22, and the bottom and side walls of the net bag have multiple liquid outlets 211.

[0119] Reference Fig.15In some embodiments, the post-processing device further includes a temperature regulating mechanism 4, which is used to generate a dynamic temperature distribution and / or to regulate the temperature of the region where the 3D printed object 1 is located based on a pre-configured temperature control strategy to reduce the viscosity of the excess printing material 6. Specifically, the temperature regulating mechanism 4 regulates the regional temperature through one or more of the following: a quartz heating tube, a PTC heating source, an infrared heating source, a heated fluid, a heated gas, a heating plate, or a heat exchanger.

[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 at least in a first time period, and controlling the temperature of the area where the 3D printed object 1 is located to be maintained at a second temperature at least in a second time period, and the first temperature is greater than or less than the second temperature.

[0121] It should be noted that the 3D printed object 1 in this embodiment is a solid or semi-solid polymer that has not undergone a curing process and is easily deformed if exposed to a high temperature environment for a long time. Through dynamic temperature control, the viscosity of the excess printing material can be reduced, while preventing the 3D printed object 1 from being deformed due to excessive temperature. For example, Fig.16 As shown in (a), the temperature of the control area is first high and then low, and the temperature of the area is increased in the time period 0-t1 to reduce the viscosity of the resin material and improve the separation efficiency of the resin material. Then, after t1, the temperature is reduced to avoid long-term heating causing excessive temperature and deformation of the 3D printed object 1; or Fig.16 As shown in (b), if the surface of the 3D printed object 1 is adhered to a lot of resin when it leaves the printing area, since the resin flows faster under the action of force when there is a lot of resin, a low temperature can be used in the time period 0-t1, and then the temperature of the area can be increased in the time period t1-t2 to reduce the viscosity of the resin material, and then the temperature can be lowered after t2 to avoid long-term heating. Fig.16 The regional temperatures in (a) and 16(b) represent the temperature setting values. Since the time of temperature change depends on the power of the heater / cooler, the process time of heating or cooling is not shown in the figure. The figure is an example of the set temperature. In specific applications, the heating process can be slow.

[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 maintain within a preset temperature value range; or determining the temperature control parameters based on the material type and the pre-configured mapping relationship between the material type and the temperature control parameters.

[0123] For example, Fig.16As shown in (c), for some 3D printed objects 1 that are not easy to deform or have low precision requirements, the temperature of the area where the 3D printed object 1 is located can be controlled to maintain a preset temperature value range during the entire dripping process to improve the efficiency of separating excess printing materials. In some embodiments, a database can also be established based on the mapping relationship between the type of printing material and the temperature control parameter, and different temperature control parameters can be configured for different printing materials. The temperature control parameters include one or more of the heating start time, heating end time, heating duration, temperature setting value, heat dissipation or cooling time. For example, for materials with high viscosity, the following method can be used: Fig.16 (c) Full temperature control method.

[0124] In one embodiment, the post-processing device further includes a temperature sensor 44, which is used to detect the regional temperature or the ambient temperature; wherein the working state of the temperature regulating mechanism 4 is controlled based on the detection data of the temperature sensor 44. The temperature sensor 44 can be installed on the receiving mechanism 2 or near the heat source 42, such as Fig.17 As shown. By detecting the regional temperature through the sensor, the temperature can be adjusted in real time for more accurate control of the regional temperature.

[0125] Reference Fig.17 , Fig.18 The temperature regulating mechanism 4 includes a heat source 42 and an air outlet component 41, and the heat source 42 and the air outlet component 41 are used to generate heated gas so that the 3D printed object 1 is in the heated gas. Among them, the air outlet component 41 has a plurality of air outlets, and the wind blowing area formed by the plurality of air outlets covers the 3D printed object 1; or the plurality of air outlets are moved so that the wind blowing area covers the 3D printed object 1. Exemplarily, the air outlet of the air outlet component 41 is arranged above the 3D printed object 1, and the heat source 42 is arranged at the air outlet. The air outlet component 41 includes a fan, a guide rail 43 and a driving member, and the driving member can drive the fan to move along the direction of the guide rail 43 so that the wind blowing area of ​​the fan covers the entire 3D printed object 1, such as Fig.17 Alternatively, multiple fans or fans with multiple air outlets are provided, in which case the wind blowing area of ​​the fans can completely cover the 3D printed object 1, and there is no need to move the fans. For example, two fans are provided to overlap and cover the 3D printed object 1, as shown in FIG. Fig.18As shown. It can be understood that in the present invention, the temperature of the region is controlled by heated gas, so that the temperature distribution in the region where the 3D printed object 1 is located can be uniform, the efficiency of resin separation is improved, and at the same time, deformation of the object caused by excessive temperature in some regions is avoided. In other embodiments, the air outlet of the air outlet component 41 can also be arranged on the side of the 3D printed object 1, and the heat source 42 can also be arranged on the side of the 3D printed object 1, and the present invention does not limit this. In other embodiments, the temperature regulating mechanism 4 can also adopt 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 adjust the temperature of the region, and the present invention does not limit this.

[0126] In another embodiment, the post-processing device further includes an air outlet mechanism, which is used to generate flowing gas so that the 3D printed object 1 is placed in the flowing gas to accelerate the flow of excess printing material 6. For example, a high-pressure air gun or a high-pressure air knife is used to blow out compressed air, and the force generated by the high-pressure airflow is used to accelerate the flow of the resin material to improve the separation efficiency.

[0127] In another embodiment, the post-processing device further includes a vibration mechanism, which is used to vibrate the 3D printed object 1 to accelerate the flow of excess printing material 6. For example, a vibrator is installed on the material receiving mechanism 2 to drive the material receiving mechanism 2 and the 3D printed object 1 to vibrate, and the flow of the resin material is accelerated by the vibration force to improve the separation efficiency.

[0128] In some embodiments, Fig.17 , Fig.18 As shown, the post-processing device further includes a material recovery 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, a large amount of resin material will be taken out. By setting up the material recovery container 5 to recover the excess printing material, the recovered 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 material receiving mechanism 2 for carrying a 3D printed object 1 with excess printing material 6; a movable mechanism 3 is used to set the 3D printed object 1 at a first dripping position in a first time period to separate the excess printing material 6 adhering to the 3D printed object 1; wherein the inclination angle of the 3D printed object 1 in the first dripping position is determined based on a preset angle value and / or a shape feature of the 3D printed object 1.

[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 dripping position, for example Fig.10(a) The first dripping position. It should be noted that, for different 3D printed objects 1, the first dripping position may be different, and the movable mechanism 3 can make different 3D printed objects 1 be in different dripping positions. Exemplarily, for a certain type of 3D printed object 1, the preset angle value in the first dripping position is set based on an empirical value, such as 45°, that is, the inclination angle of the 3D printed object 1 is set at 45° for dripping.

[0131] Optionally, the process of determining the inclination angle in the first dripping position includes: determining the optimal dripping angle based on a preset angle matching model and the shape characteristics of the 3D printed object 1; and obtaining the inclination angle of the 3D printed object 1 in the first dripping position according to the optimal dripping angle. Exemplarily, a machine learning model is established, the shape data of the 3D printed object 1 and the corresponding historical angle data are input, and the optimal dripping angle corresponding to the 3D printed object 1 is automatically identified through machine learning. Among them, the optimal dripping angle represents the angle that can make the dripping efficiency of the resin material in the 3D printed object 1 the highest or the amount of the resin material dripping the largest, such as the angle when the cup mouth in the inverted cup mouth structure faces downward.

[0132] Optionally, the first dripping position is a dripping position where the opening of the liquid accumulation area is downward; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself. In a specific application, if the 3D printed object 1 has a liquid accumulation area 11 caused by a special structure, such as an inverted cup mouth structure, the dripping position where the cup mouth of the inverted cup mouth structure is downward can be recorded as the first dripping position, and then dripping is performed by staying at the first dripping position for t time, which can improve the efficiency of separating excess printing materials.

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

[0134] The present invention also provides a post-processing method for 3D printed objects, comprising carrying a 3D printed object 1 having excess printing material 6; changing the dripping position of the 3D printed object 1 to separate the excess printing material 6 from the 3D printed object 1; wherein the 3D printed object 1 has different inclination angles at different dripping positions.

[0135] It should be noted that the 3D printed object 1 includes a solid or semi-solid polymer, and the excess printing material 6 includes uncured polymer resin. After the 3D printing is completed, due to the properties of the printing material itself, such as the resin material having a certain viscosity, the resin material can adhere to the surface of the 3D printed object 1, resulting in the surface of the 3D printed object 1 being covered with unused liquid resin brought out from the printing area. Alternatively, due to the structure of the 3D printed object 1 itself, such as an inverted cup mouth structure, a C-shaped dental mold, a hollow dental mold, etc., uncured resin materials are easily present inside these structures. The presence of these resins will not only cause a large amount of material loss, but also increase the difficulty of subsequent processing, so it is necessary to separate these excess resins from the 3D printed object 1.

[0136] In an embodiment of the present invention, the inclination angle of the 3D printed object 1 is changed, so that the dripping position of the 3D printed object 1 can be changed. By dripping at multiple angles, the excess printing material on the 3D printed object 1 can be separated, thereby improving the efficiency of separating excess resin. At the same time, the method provided by the present invention uses a non-single angle for dripping, which is suitable for special structures such as an inverted cup structure and a recessed structure, and can achieve a better resin separation effect, reduce the solvent consumption and cleaning time during the later cleaning, and can also recycle the separated resin. In some application scenarios, the 3D printed object 1 can be directly cured after dripping, and the present invention does not limit this.

[0137] In some embodiments, Fig.10 (a) Fig.10 (b) and Fig.10 As shown in (c), the 3D printed object 1 is arranged in the material receiving mechanism 2, and the 3D printed object 1 changes position following the material receiving mechanism 2. The figure shows three different dripping positions of the material receiving mechanism 2 and the 3D printed object 1, which are recorded as dripping position a, dripping position b, and dripping position c. It can be understood that the material receiving mechanism 2 and the 3D printed object 1 have different inclination angles in different dripping positions. Among them, the inclination angle represents the angle of the 3D printed object 1 relative to the vertical direction (Z direction in the figure), and the value of the inclination angle is -180° to +180°. Exemplarily, the inclination angle is determined based on the bottom edge of the 3D printed object 1 in contact with the material receiving mechanism 2. In specific applications, the dripping position change of the 3D printed object 1 is achieved by changing the inclination angle multiple times, which is conducive to separating the excess printing materials on different surfaces and special structures of the 3D printed object 1.

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

[0139] It is understandable that in the present invention, the dripping position of the 3D printed object 1 is controlled, and after the dripping position is changed, the 3D printed object 1 can also be kept at any dripping position, that is, the entire dripping layer is not fixed at a single dripping position. Exemplarily, the preset time of different dripping positions can be set to be the same or different. After the 3D printed object 1 is kept at the dripping position a for 1 minute, the 3D printed object 1 is changed to the dripping position b and kept for 3 minutes, and then the 3D printed object 1 is changed to the dripping position c and kept for 1 minute; the 3D printed object 1 can also be continuously switched between the dripping positions a, b, and c, for example, the 3D printed object 1 is continuously switched according to abca or acbca; the 3D printed object 1 can also be continuously switched between the dripping positions a and c and kept at the dripping position b for t time, for example, the 3D printed object 1 is continuously switched between the dripping positions a and c according to acca in the time period t1-t2, and then the 3D printed object 1 is changed to the dripping position b at time t2, and then kept for t time.

[0140] In specific applications, if the 3D printed object 1 has a special structure, such as an inverted cup-shaped structure or a concave structure, the dripping position of the cup-shaped structure with the cup-shaped portion downward can be recorded as the dripping position b, and then the dripping position b is stayed for t time and continuously switched to other positions to drip, which can further improve the efficiency of separating excess printing materials.

[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 preconfigured 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 at least in a first time period, and controlling the temperature of the area where the 3D printed object 1 is located to be maintained at a second temperature at least in a second time period, and the first temperature is greater than or less than the second temperature.

[0143] It should be noted that the 3D printed object 1 in this embodiment is a solid or semi-solid polymer that has not undergone a curing process and is easily deformed if exposed to a high temperature environment for a long time. Through dynamic temperature control, the viscosity of the excess printing material can be reduced, while preventing the 3D printed object 1 from being deformed due to excessive temperature. For example, Fig.16 As shown in (a), the temperature of the control area is high first and then low. In the time period 0-t1, the temperature of the area is increased to reduce the viscosity of the resin material and improve the separation efficiency of the resin material. Then, after t1, the temperature is reduced to avoid long-term heating; or, as Fig.16 As shown in (b), if the surface of the 3D printed object 1 is adhered to a lot of resin when it leaves the printing area, since the resin flows faster under the action of force when there is a lot of resin, a low temperature can be used in the time period 0-t1, and then the temperature of the area can be increased in the time period t1-t2 to reduce the viscosity of the resin material, and then the temperature can be lowered after t2 to avoid long-term heating. Fig.16 The regional temperatures in (a) and 16(b) represent the temperature setting values. Since the time of temperature change depends on the power of the heater / cooler, the process time of heating or cooling is not shown in the figure. The figure is an example of the set temperature. In specific applications, the heating process can be slow.

[0144] Among them, the temperature control strategy includes one or more of the following: controlling the temperature of the area where the 3D printed object 1 is located to maintain it within a preset temperature value range; or determining the temperature control parameters based on the material type and the pre-configured mapping relationship between the material type and the temperature control parameters.

[0145] For example, Fig.16 As shown in (c), for some 3D printed objects 1 that are not easy to deform or have low precision requirements, the temperature of the area where the 3D printed object 1 is located can be controlled to maintain a preset temperature value range during the entire dripping process to improve the efficiency of separating excess printing materials. In some embodiments, a database can also be established based on the mapping relationship between the type of printing material and the temperature control parameter, and different temperature control parameters can be configured for different printing materials. The temperature control parameters include one or more of the heating start time, heating end time, heating duration, temperature setting value, heat dissipation or cooling time. For example, for materials with high viscosity, the following method can be used: Fig.16 (c) Full temperature control method.

[0146] Wherein, the method further comprises: adjusting the temperature of the zone by one or more of the following: a quartz heating tube, a PTC heating source, an infrared heating source, a heated fluid, a heated gas, a heating plate or a heat exchanger.

[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, the temperature sensor 44 is used to detect the regional temperature or the ambient temperature; wherein the working state of the temperature regulating mechanism 4 is controlled based on the detection data of the temperature sensor 44. The temperature sensor 44 can be installed on the receiving mechanism 2 or near the heat source 42, such as Fig.17 As shown. By detecting the regional temperature through the sensor, the temperature can be adjusted in real time for more accurate control of the regional temperature.

[0149] In one embodiment, the method further comprises: applying heated gas so that the 3D printed object 1 is in the heated gas.

[0150] Reference Fig.17 , Fig.18 , a temperature regulating mechanism 4 is provided, including a heat source 42 and an air outlet component 41, the heat source 42 and the air outlet component 41 are used to generate heated gas so that the 3D printed object 1 is in the heated gas. Among them, the air outlet component 41 has a plurality of air outlets, and the wind blowing area formed by the plurality of air outlets covers the 3D printed object 1; or the plurality of air outlets are moved so that the wind blowing area covers the 3D printed object 1. Exemplarily, the air outlet of the air outlet component 41 is arranged above the 3D printed object 1, and the heat source 42 is arranged at the air outlet. The air outlet component 41 includes a fan, a guide rail 43 and a driving member, and the driving member can drive the fan to move along the direction of the guide rail 43 so that the wind blowing area of ​​the fan covers the entire 3D printed object 1, such as Fig.17 Alternatively, multiple fans or fans with multiple air outlets are provided, in which case the wind blowing area of ​​the fans can completely cover the 3D printed object 1, and there is no need to move the fans. For example, two fans are provided to overlap and cover the 3D printed object 1, as shown in FIG. Fig.18 As shown. It can be understood that in the present invention, the temperature of the region is controlled by heated gas, so that the temperature distribution of the region where the 3D printed object 1 is located can be uniform, the efficiency of resin separation is improved, and at the same time, deformation of the object caused by excessive temperature in some regions is avoided. In other embodiments, the air outlet of the air outlet component 41 can also be arranged on the side of the 3D printed object 1, and the heat source 42 can also be arranged on the side of the 3D printed object 1, and the present invention does not limit this.

[0151] In one embodiment, the method further comprises: applying flowing gas so that the 3D printed object 1 is placed in the flowing gas to accelerate the flow of the excess printing material 6 .

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

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

[0154] Specifically, a vibration mechanism is provided, which is used to vibrate the 3D printed object 1 to accelerate the flow of the excess printing material 6. For example, a vibrator is installed on the material receiving mechanism 2 to drive the material receiving mechanism 2 and the 3D printed object 1 to vibrate, and the flow of the resin material is accelerated by the vibration force to improve the separation efficiency.

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

[0156] Furthermore, the method further comprises: filtering the collected excess printing material 6.

[0157] Furthermore, the method further includes: reusing the filtered excess printing material 6 in subsequent 3D printing; or mixing the filtered excess printing material 6 with new printing material to reuse the mixed printing material in subsequent 3D printing.

[0158] In some embodiments, Fig.17 , Fig.18 , Fig.19 As shown, a material recovery container 5 is provided, and the material recovery container 5 is used to collect at least a portion of the excess printing material 6. When the 3D printed object 1 leaves the printing area, a large amount of resin material will be taken out. By providing the material recovery container 5 to recover the excess printing material, the recovered resin material can be used in subsequent 3D printing, thereby avoiding waste of materials and saving printing costs.

[0159] It should be noted that all process steps of a post-processing method for 3D printed objects provided in an embodiment of the present invention are implemented based on a post-processing device for 3D printed objects in the above-mentioned embodiment, and the working principles and beneficial effects of the two correspond one to one, so they are not repeated here.

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

[0161] Carrying a 3D printed object 1 with excess printing material 6;

[0162] The 3D printed object 1 is set at a first dripping position in a first time period to separate excess printing material 6 adhering to the 3D printed object 1; wherein the inclination angle of the 3D printed object 1 in the first dripping position is determined based on a preset angle value and / or a shape feature of the 3D printed object 1.

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

[0164] In one embodiment, the first dripping position is a dripping position of the opening portion of the liquid accumulation area downward; wherein the liquid accumulation area is formed by the structure of the 3D printed object itself.

[0165] It should be noted that all process steps of a post-processing method for 3D printed objects provided in an embodiment of the present invention are implemented based on a post-processing device for 3D printed objects in the above-mentioned embodiment, and the working principles and beneficial effects of the two correspond one to one, so they are not repeated here.

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

[0167] It should be noted that the post-processing device can be integrated into the 3D printer. After the 3D printing is completed, the 3D printed object 1 is moved to the material receiving mechanism 2 through the automatic shoveling mechanism, and then dripping is performed, which can realize automatic shoveling and automatic dripping, greatly saving labor costs. Of course, the post-processing device can also be set independently, and the present invention is not limited to this.

[0168] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

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

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

[0171] (3) In the embodiments of the present invention, dynamic temperature control can reduce the viscosity of the excess printing material, improve the separation efficiency of the excess printing material 6, and avoid deformation of the 3D printed object 1 caused by excessive temperature, and can also adapt to different printing materials. In some embodiments, the temperature of the region is controlled by heated gas, so that the temperature distribution of the region where the 3D printed object 1 is located can be uniform, the efficiency of resin separation is improved, and deformation of the object caused by excessive temperature in some regions is avoided.

[0172] (4) In the embodiment of the present invention, the material recovery container 5 is provided to recover the excess printing material, and the recovered resin material can be used in subsequent 3D printing, thereby avoiding waste of materials and saving printing costs.

[0173] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0174] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0175] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0177] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0178] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A post-processing device, characterized in that: Applied to three-dimensional printing equipment, the post-processing device comprises: A material receiving mechanism (2), wherein the material receiving mechanism (2) is used to carry a 3D printed object (1) with excess printing material; A movable mechanism (3), the movable mechanism (3) is used to change the dripping position of the 3D printed object (1) so that the excess printing material drips from the 3D printed object (1), and the 3D printed object (1) has at least two different inclination angles during the change of the dripping position; or, the movable mechanism (3) is used to set the 3D printed object (1) at a first dripping position in a first time period to separate the excess printing material adhering to the 3D printed object (1), and the inclination angle of the 3D printed object (1) in the first dripping position is determined based on a preset angle value and / or a shape feature of the 3D printed object (1).

2. The post-processing device according to claim 1, characterized in that: The movable mechanism (3) is a driving mechanism (31), and the driving mechanism (31) is configured to allow the material receiving mechanism (2) to rotate from a first state to a second state.

3. A post-processing device, characterized in that: Applied to three-dimensional printing equipment, the post-processing device comprises: A material receiving mechanism (2), wherein the material receiving mechanism (2) is configured to carry a 3D printed object (1) with excess printing material; A driving mechanism (31), wherein the driving mechanism (31) is configured to allow the material receiving mechanism (2) to rotate from a first state to a second state so that the excess printing material drips from the 3D printed object (1), wherein the 3D printed object (1) has at least two different inclination angles.

4. The post-processing device according to claim 2 or 3, characterized in that: The driving mechanism (31) is configured to keep the material receiving mechanism (2) in a first state for a first period of time.

5. The post-processing device according to claim 2 or 3, characterized in that: The material receiving mechanism (2) comprises a material receiving body (21), the material receiving body (21) having an opening (210), a liquid outlet (211) and a receiving cavity (212) for receiving the 3D printed object (1), the opening (210) and the liquid outlet (211) both being in communication with the receiving cavity (212).

6. The post-processing device according to claim 2 or 3, characterized in that: The post-processing device further comprises at least one of a temperature regulating mechanism (4), an air outlet mechanism, and a vibration mechanism; The temperature regulating mechanism (4) is used to generate a dynamic temperature distribution and / or to regulate 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 placed in the flowing gas to accelerate the flow of excess printing material; and the vibration mechanism is used to cause the 3D printed object (1) to vibrate so as to accelerate the flow of excess printing material.

7. The post-processing device according to claim 5, characterized in that: The three-dimensional printing device comprises a molding platform (111), a material tray (112) and a separation device (113), wherein the molding platform (111) has a molding surface, the molding surface is used for attaching a 3D printed object (1), and the separation device (113) is used for separating the 3D printed object (1) from the molding surface; The material receiving body (21) is configured to allow movement between a first position and a second position. The material receiving body (21) is configured to receive a 3D printed object (1) with excess printing material at the first position, and to allow the material receiving body (21) to rotate from the first state to the second state at the second position.

8. The post-processing device according to claim 5, characterized in that: The three-dimensional printing device comprises a molding platform (111), a material tray (112) and a separation device (113), wherein the molding platform (111) has a molding surface, the molding surface is used to attach a 3D printed object (1), and the separation device (113) is used to separate the 3D printed object (1) from the molding surface; the three-dimensional printing device also comprises a conveying component (117), the conveying component (117) is used to transfer the 3D printed object (1) separated from the molding surface to the material receiving body (21).

9. The post-processing device according to claim 5, characterized in that: The driving mechanism (31) further comprises a first transmission mechanism (311), wherein the first transmission mechanism (311) is drivingly connected to the material receiving body (21) so as to drive the material receiving body (21) to rotate around a transverse axis.

10. The post-processing device according to claim 9, characterized in that: The first transmission mechanism (311) comprises a motor, a synchronous belt and a rotating shaft, wherein the motor is arranged at one side of the material receiving body (21), 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 arranged on the material receiving body (21); or The first transmission mechanism (311) comprises a motor and a rotating shaft, wherein the motor is arranged at one side of the material receiving body (21), and the output end of the motor is connected to the rotating shaft, and the rotating shaft is arranged on the material receiving body (21).

11. The post-processing device according to claim 7, characterized in that: The driving mechanism (31) further comprises a sliding assembly (312), and the sliding assembly (312) is capable of driving the material receiving body (21) to move between the first position and the second position.

12. The post-processing device according to claim 7, characterized in that: The material receiving body (21) comprises a cover plate (22), and the cover plate (22) is arranged on the opening (210) in an openable and closable manner; a stopper (221) is arranged on the cover plate (22), and when the material receiving body (21) moves to the first position, the stopper (221) abuts against the housing of the three-dimensional printing device, and a return spring is arranged between the cover plate (22) and the material receiving body (21).

13. The post-processing device according to claim 11, characterized in that: The sliding assembly (312) includes a first motor, a second motor, a slide (3121) and a connecting rod (3122), wherein the first motor is used to drive the slide (3121) to drive the material receiving body (21) to move between the first position and the second position; the connecting rod (3122) is arranged on the slide (3121), and the material receiving body (21) can be rotatably arranged on the connecting rod (3122), and the second motor is used to drive the material receiving body (21) to rotate relative to the connecting rod (3122), so that the material receiving body (21) rotates from a first state to a second state at the second position.

14. The post-processing device according to claim 5, characterized in that: The material receiving body (21) comprises a side portion (213) and a bottom portion (214); one end of the side portion (213) is connected to the bottom portion (214); an opening (210) of the material receiving body (21) is arranged on a side of the material receiving body (21) opposite to the bottom portion (214); and the liquid outlet (211) is arranged on the side portion (213) and / or the bottom portion (214).

15. The post-processing device according to claim 14, characterized in that: The structure of the material receiving body (21) includes one of a square, spherical, hemispherical, V-shaped, and funnel-shaped structure, and the liquid outlet (211) includes one or more of a circular hole, a square hole, a triangular hole, and a strip-shaped opening.

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

17. The post-processing device according to claim 5, characterized in that: The material receiving body (21) comprises an oleophobic layer or a hydrophobic layer.

18. The post-processing device according to claim 9, characterized in that: The material receiving mechanism (2) further comprises: A first liquid receiving container (23), wherein the first liquid receiving container (23) is configured to receive printing material from the material receiving body (21).

19. The post-processing device according to claim 18, characterized in that: The material receiving mechanism (2) further comprises: A material receiving container (25) is located below the first liquid receiving container (23), and the first transmission mechanism (311) is capable of rotating the material receiving body (21) so that the 3D printed object (1) moves out of the opening (210) of the material receiving body (21) and enters the material receiving container (25) through the opening of the material receiving container (25); A second transmission mechanism (24), wherein the second transmission mechanism (24) is capable of driving the first liquid receiving container (23) to move relative to the material receiving container (25) to allow the 3D printed object (1) to enter the material receiving container (25) through an opening of the material receiving container (25).

20. The post-processing device according to claim 18, characterized in that: The material receiving mechanism (2) further comprises: A material receiving container (25) is located on the side of the material receiving body (21); A transfer receiving container (28), wherein the first transmission mechanism (311) is capable of rotating the material receiving body (21) so that the 3D printed object (1) moves out of the opening (210) of the material receiving body (21) and enters the transfer receiving container (28); A toggle mechanism (291) and a third transmission mechanism (292), wherein the toggle mechanism (291) is arranged in the transfer receiving container (28), and 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 material receiving container (25) through the opening of the material receiving container (25).

21. The post-processing device according to claim 19 or 20, characterized in that: The material receiving container (25) is provided with a material full sensor, and the material full sensor is used to detect whether the printing objects in the material receiving container (25) are accumulated to a predetermined height or detect whether the printing objects in the material receiving container (25) reach a predetermined weight.

22. The post-processing device according to claim 18, characterized in that: The material receiving mechanism (2) further comprises: a second liquid receiving container (26), the second liquid receiving container (26) being used for connecting to the material recovery container (5); The opening of the second liquid receiving container (26) is in communication with the first liquid receiving container (23); and / or a liquid receiving track (27) is provided between the second liquid receiving container (26) and the three-dimensional printing device.

23. A three-dimensional printing device, characterized in that: The three-dimensional printing device comprises a post-processing device according to any one of claims 1 to 22, and the three-dimensional printing device further comprises: A material tray (112), used for holding printing materials; A molding platform (111) having a molding surface and used to adhere the printing material to the molding surface layer by layer 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) comprises one of a shoveling mechanism, an extruding mechanism, an ejecting mechanism or a laser cutting mechanism.

24. The three-dimensional printing device according to claim 23, characterized in that: The three-dimensional printing device also includes a conveying component (117), which is used to transfer the 3D printed object (1) separated from the molding surface to the material receiving body (21) of the post-processing device; the conveying component (117) has a first position that moves to above the material tray (112) and a second position that moves to above the material receiving body (21) to transfer the 3D printed object (1) to the material receiving body (21).

25. The three-dimensional printing device according to claim 23, characterized in that: The three-dimensional printing device also includes a pipeline for conveying printing material to the material tray (112), one end of the pipeline being connected to the material recovery container (5) of the post-processing device, and the other end being connected to the material tray (112).

26. A system for three-dimensional printing, comprising at least one three-dimensional printing device and a post-processing apparatus as claimed in any one of claims 1 to 22.

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