Separating device for discharging 3D printing products and 3D printing equipment with separating device

Abstract

The utility model discloses a separating device for unloading 3D printing products and 3D printing equipment with the separating device, the separating device comprises a printing platform, the surface of the printing platform is provided with protrusions, and the upper surfaces of the protrusions form a bearing surface of the 3D printing products; the separating plate is provided with a hollow-out part, and at least part of the protrusion of the printing platform is embedded into the hollow-out part; and the driving device is used for driving the printing platform and the separating plate to generate relative displacement. When the separating device and the 3D printing equipment with the separating device are used for 3D printing, damage to 3D printing products can be reduced, the rate of finished products is increased, meanwhile, the printed and formed 3D printing products are rapidly collected and discharged, the production efficiency is improved, and separation abnormity can be found and eliminated in time.

Description

Technical Field

[0001] The utility model relates to the technical field of ultraviolet light curing 3D printing, and in particular to a separation device for unloading 3D printed products and a 3D printing device having the same. Background Art

[0002] 3D printing technology is a rapid prototyping technology that solidifies and sinters different materials such as plastic filaments, photosensitive resins, metal powders and thermoplastic powders through fused deposition modeling, photocuring, selective laser sintering and powder hot melting, and converts digital models into physical objects layer by layer. Different from traditional cutting processing, it belongs to the additive manufacturing process and is easy to manufacture parts with complex surface structures or hollow structures. It is widely used in the automotive, aerospace, medical industry and construction fields.

[0003] After 3D printed products are printed, they are often attached to the printing platform and need to be peeled off the printing platform.

[0004] In the prior art:

[0005] Document 1 (CN206264354U) discloses a photocurable 3D printing device and system capable of automatic continuous printing, wherein the automatic printing and piece collection device 220 may include a material trough 221 for accommodating photosensitive resin, a lifting platform 222 for connecting a molded workpiece 300, a coating scraper 223 for spreading the photosensitive resin, an image exposure system 224 for curing the photosensitive resin, a lifting device 225 for separating the workpiece 300 from the lifting platform 222, and a collection scraper 226 for scraping the workpiece 300 separated from the lifting platform 222 away from the lifting platform 222. However, the lifting device 225 used therein is a plurality of push rods, which cooperate with the through holes on the lifting platform 222. Since the contact area between the push rods and the workpiece is small, the push rods cannot exert force on the workpiece as a whole during the separation operation. The workpiece is subjected to a large pressure locally, which is easy to puncture the workpiece. At the same time, for workpieces with a hollow bottom structure, the push rods often cannot find the force point. Furthermore, in the early stage of printing, the lifting platform 222 with through holes lacks support for the workpiece at the through holes, which affects the printing effect. In addition, the push rods need to correspond to the through holes of the lifting platform 222 one by one. A large number of push rods cooperate with the through holes, which is difficult to assemble. When in use, the push rods are generally immersed in the photosensitive resin. When foreign objects such as residues fall between the push rods, it is difficult to be found. It is usually necessary to release the resin in the resin tank, which is very troublesome to maintain. The residues can also easily cause the push rods and the through holes to get stuck, causing damage to the equipment. The processing cost of the push rods is high. Even if one push rod is damaged, the entire lifting device 225 needs to be replaced.

[0006] Document 2 (CN114147967B) discloses a data processing method and system for a three-dimensional model, a pickup mechanism and a 3D printing device, wherein the component platform includes a plurality of grooves 41 and through holes 42 arranged in the grooves 41, the grooves 41 are used to cooperate with the lower scraper, and the blade of the scraper is provided with a plurality of comb teeth structures 41' that cooperate with the grooves 41 on the component platform. During the pickup operation, the component platform 51 rises below the scraper 61 so that the comb teeth structure of the scraper 61 cooperates with the grooves of the component platform 51, and then the pickup operation is performed. This structure still uses a method similar to traditional manual stripping to scrape the workpiece off the component platform, and the product is easily damaged and has a low pass rate.

[0007] Document 3 (CN214324201U) discloses a pick-up mechanism and a 3D printing device applicable thereto, which also uses a component platform 51 with grooves and a scraper member 61 with a comb-tooth structure to cooperate. During the pick-up operation, the component platform 51 rises below the scraper member 61 so that the comb-tooth structure of the scraper member 61 cooperates with the groove of the component platform 51, and then the pick-up operation is performed. When this structure peels off the workpiece, it is directly scraped with a scraper, and the product is easily damaged, especially for products with relatively large adhesion to the printing platform, and the qualified rate is low.

[0008] Document 4 (CN105026131B) discloses an automatic removal of a 3D printer component, which uses a drive mechanism to drive a blade 20 across a printing surface 12 to engage and then remove the printed component. When the structure peels off the workpiece, the blade is directly used to scrape it off, and the product is easily damaged, especially for products with relatively large adhesion to the printing platform, and the qualified rate is low.

[0009] Document 5 (CN111434482A) discloses a 3D printing device, a device and method for picking up a workpiece, a control device, and a storage medium. The ejection mechanism 13 is driven by the first driving mechanism 12 to lift up the workpiece to be picked up that is adhered to the mesh plate 11, so that the workpiece to be picked up placed on the mesh plate 11 can be separated from the mesh plate 11; a shovel mechanism 14 and a second driving mechanism, wherein the second driving mechanism 15 is connected to the shovel mechanism 14 and can drive the shovel mechanism 14 to move. When the shovel mechanism 14 is driven by the second driving mechanism 15, the workpiece to be picked up on the mesh plate 11 can be removed. In this way, the ejection mechanism 13 separates the workpiece to be picked up from the mesh plate 11, and then the shovel mechanism 14 removes the workpiece to be picked up from the mesh plate, thereby realizing automatic picking up. CN206264354U, CN108215173A, and WO2018108189A1 adopt similar structures. However, the ejection mechanism of the above structure is complex to form, and there are defects such as uneven force on the product during ejection and low pass rate; the workpiece peeling process is long and the printing efficiency is low.

[0010] In the above-mentioned prior art, the manual peeling method is prone to damage the product due to uneven force on the product. At the same time, when printing in large quantities, the manual peeling method is inefficient and affects the production progress. Automatic peeling has the disadvantages of complex forming of corresponding parts, uneven force on the product, low pass rate, long peeling process and low printing efficiency. Utility Model Content

[0011] In view of the above problems, the present invention is proposed to provide a task flow control method, device, electronic device, and computer-readable storage medium that overcome the above problems or at least partially solve the above problems.

[0012] In order to solve the above problems, the utility model provides a separation device for unloading 3D printed products and a 3D printing device having the same, which can apply a separation force to the entire workpiece during separation, reduce local force, and improve the yield rate.

[0013] The utility model provides a separation device for unloading 3D printed products, comprising:

[0014] A printing platform, wherein a protrusion is provided on the surface of the printing platform, and an upper surface of the protrusion forms a bearing surface for a 3D printed product;

[0015] A separation plate, the separation plate having a hollow portion, the protrusion of the printing platform at least partially embedded in the hollow portion;

[0016] The driving device is used to drive the printing platform and the separation plate to produce relative displacement, wherein the relative displacement can be relative translation or relative rotation. When the relative displacement is relative translation, both ends of the separation plate are freely connected to the printing platform, and the separation plate is directly driven to move relative to the printing platform by the driving device, such as by setting a cylinder, a hydraulic cylinder, a screw, etc., and there is no need to set a limit device at this time; when the relative movement is relative rotation, one end of the separation plate is rotationally connected to the printing platform, and the separation plate is directly driven to rotate relative to the printing platform by the driving device, such as by setting a motor and a reduction mechanism, and there is no need to set a limit device at this time.

[0017] Furthermore, one or more separation plates are provided.

[0018] Furthermore, the driving device further includes a limiting device for limiting the relative displacement of the printing platform and the separation plate. When the relative displacement is a relative translation, both ends of the separation plate are freely connected to the printing platform, a limiting device is provided, and the driving device drives the printing platform to move downward, and the separation plate is stopped by the limiting device; when the relative movement is a relative rotation, one end of the separation plate is rotationally connected to the printing platform, a limiting device is also provided, and the driving device drives the printing platform to move downward, and the separation plate is stopped by the limiting device.

[0019] Furthermore, the limiting device is a limiting block, and when the driving device drives the printing platform to move downward, at least one end of the separation plate stops on the upper surface of the limiting block.

[0020] Furthermore, it also includes a scraper plate, which is arranged above the printing platform and is used to further scrape the 3D printed product away from the printing platform. The scraper plate can move horizontally or rotationally relative to the printing platform.

[0021] Furthermore, the limit block is arranged on the back side of the scraper plate. Since the functions of the limit block and the scraper plate are independent of each other and they do not work at the same time, the two are integrated so that the limit block and the scraper plate use the same set of driving mechanism, which saves space and reduces the cost of the equipment.

[0022] Furthermore, the upper surface of the limit block is trapezoidal, wavy or other non-plane for adjusting separation. Setting the upper surface of the limit block as a non-plane makes the limit block have different thicknesses at different positions. When limiting different separation plates, there is a sequence of separation operations, which can effectively reduce the separation force.

[0023] Furthermore, the printing platform has a plurality of protrusions arranged at intervals, and the protrusions are in the shape of long strips, cylinders or polygonal columns.

[0024] Furthermore, the shape of the hollow portion of the separation plate is the same as the cross-sectional shape of the protrusion of the printing platform, and the shapes of the printing platform and the separation plate that are suitable for easy separation are selected according to the shapes of different printing substrates and 3D printed products.

[0025] Furthermore, the ratio of the area of ​​the separation plate to the area of ​​the bearing surface is 1:1-1:5. The smaller the ratio, the smaller the area of ​​the separation plate, the larger the area of ​​the raised upper surface, the better the support for the 3D printed product, and the easier it is to print, but the separation force is large; the larger the ratio, the larger the area of ​​the separation plate, the smaller the area of ​​the raised upper surface, the smaller the separation force, but the printing is prone to failure.

[0026] Furthermore, the upper surface of the separation plate is flush with or lower than the bearing surface of the printing platform. The upper surface of the separation plate is set lower than the bearing surface of the printing platform. During the printing process, the separation plate does not contact the 3D printed product, and thus no adhesion occurs. When the printing platform and the separation plate produce relative displacement, the 3D printed product is separated from the printing platform.

[0027] Furthermore, the upper surface of the separation plate is 0-20 mm lower than the surface of the printing platform.

[0028] The utility model also provides a 3D printing device, which has a printing device, and the printing device has the above-mentioned separation device for unloading 3D printed products.

[0029] Furthermore, the printing device also includes an ultraviolet light irradiation device.

[0030] Furthermore, the 3D printing equipment also includes a control system, a frame and a resin tank. The frame includes a base and a mounting frame arranged above the base. The resin tank is arranged on the upper plane of the base. The printing device is arranged on the mounting frame. The control system controls the printing device to automatically complete printing and unloading operations.

[0031] Beneficial effect: The utility model adopts a relatively movable separation plate and a printing platform, and realizes the separation of the 3D printed product from the printing platform through the relative movement of the two. Compared with the existing ejector type and shovel plate type separation devices, the contact area between the separation plate and the 3D printed product of the utility model is large, the 3D printed product is evenly stressed, and the workpiece will not be punctured. At the same time, it has good support for the 3D printed product and will not damage the workpiece.

[0032] The limiting block is set, and the separation effect can be achieved by locking the separation plate, simplifying the separation operation; the entire separation process of the separation mechanism is located above the liquid level of the resin solution, and when an abnormality occurs, it can be discovered and eliminated in time, which is friendly to later maintenance. Even if the residue or other foreign matter generated falls into the resin tank, it will not affect the printing and separation operations; the scraper plate is set to facilitate the collection and unloading of 3D printed products; the limiting block and the scraper plate are integrated so that the limiting block and the scraper plate use the same set of driving mechanisms, saving space and reducing the cost of the equipment; the separation plates are provided with multiple and the limiting block has a stepped shape, so that the limiting block has different thicknesses at different positions. When different separation plates are limited, there is a sequence of separation operations, which can effectively reduce the separation force; the ratio of the area of ​​the separation plate to the area of ​​the bearing surface is set to 1:1-1:5, and the bearing surface has good support for the 3D printed product, and at the same time, it will not cause excessive separation force and cause separation difficulties; the upper surface of the separation plate is set to be flush with or lower than the bearing surface of the printing platform, and the separation plate does not adhere to the 3D printed product, and the separation efficiency is high.

[0033] The use of the separation device and printing equipment of the utility model can reduce damage to 3D printed products, improve the yield rate, and quickly collect and unload the printed 3D printed products, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a 3D printing device of the utility model;

[0035] Figure 2It is a side view of a 3D printing device of the utility model;

[0036] Figure 3 It is a schematic diagram of a printing platform and a separation plate of a structural form of the utility model;

[0037] Figure 4 It is a partial enlarged view of the printing platform and the separation plate of the utility model;

[0038] Figure 5a-5c It is a schematic diagram of a printing platform and a separation plate of other structural forms of the utility model;

[0039] Figure 6 It is a schematic diagram of the separation process of the parallel embedding form of the utility model;

[0040] Figure 7 It is a schematic diagram of the separation process of the rotary embedding form of the utility model;

[0041] Figure 8 It is a schematic diagram of the separation process of the rotary embedding form from another perspective of the utility model;

[0042] Fig. 9 It is a side view of the rotary embedding form of the utility model;

[0043] Fig.10 It is a structural schematic diagram of the limit block and the scraper plate of the utility model;

[0044] Fig.11 It is a side view of the limit block and the scraper plate of the utility model;

[0045] Fig.12 It is a schematic diagram of a stepped limiting block of the utility model;

[0046] Figures 13a-13d It is a schematic diagram of different step shapes of the limit block of the utility model;

[0047] Fig.14 It is a structural schematic diagram of a separation plate of the utility model;

[0048] Fig.15 It is a structural schematic diagram of the 3D printing product of the utility model.

[0049] Among them: 10-3D printing equipment, 100-frame, 200-resin tank, 300-printing device, 310-separation device, 311-printing platform, 312-raised upper surface, 313-raised, 314-separation plate, 315-upper surface of separation plate, 316-upper stopper, 317-limiting block, 318-scraper plate, 319-hollow part, 320-scraper, 330-ultraviolet light irradiation device, 500-3D printing product. DETAILED DESCRIPTION

[0050] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0051] In the following description, with reference to the accompanying drawings, several embodiments of the present application are described. It should be understood that other embodiments may also be used, and mechanical composition, structure, electrical and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used here are only to describe specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0052] Although the terms first, second, etc. are used to describe various elements or parameters in this article in some instances, these elements or parameters should not be limited by these terms. These terms are only used to distinguish an element or parameter from another element or parameter. For example, the first mobile assembly can be referred to as the second mobile assembly, and similarly, the second mobile assembly can be referred to as the first mobile assembly, without departing from the scope of the various described embodiments. The first mobile assembly and the second mobile assembly are both describing a mobile assembly, but unless the context clearly indicates otherwise, they are not the same mobile assembly. Similar situations also include the first guide rail and the second guide rail, or the first drive component and the second drive component.

[0053] Furthermore, as used in this article, the singular forms "one", "an" and "the" are intended to include plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way.

[0054] Fig.15The utility model relates to a 3D printing product 500, specifically a dental brace.

[0055] Figure 1-14 This is a schematic diagram of the structure of a 3D printing device of the utility model. Figure 1 The 3D printing device 10 includes a control system (not shown in the figure), a frame 100, a resin tank 200 and a printing device 300. The frame 100 includes a base and a mounting frame arranged above the base. The resin tank 200 is arranged on the upper plane of the base and is used to hold a resin solution as a printing substrate. The printing device 300 is arranged on the mounting frame and is used to immerse in the resin solution, and then cure it after ultraviolet light irradiation, and then separate and unload the printed product. The control system controls the 3D printing device 300 to automatically complete the above operations.

[0056] Figure 2-4 3 is a schematic diagram of the structure of the printing device 300 of the 3D printing device 10 of the utility model. The printing device 300 includes an ultraviolet irradiation device, a separation device 310 and a scraper 320, wherein the separation device 310 includes: a printing platform 311, a separation plate 314 and a driving device (not shown in the figure).

[0057] The surface of the printing platform 311 has a plurality of protrusions 313 , and the upper surface 312 of the plurality of protrusions is substantially a plane, which constitutes a bearing surface for bearing the 3D printed product 500 .

[0058] The printing platform 311 is slidably connected to the mounting frame through a vertical guide mechanism (not shown in the figure), and a platform lifting drive mechanism (not shown in the figure) is provided on the mounting frame. The platform lifting drive mechanism drives the printing platform 311 to rise and fall on the mounting frame. The platform lifting drive mechanism can be a threaded screw mechanism, a cylinder or a hydraulic cylinder.

[0059] The separation plate 314 has a hollow portion 319, such as Fig.14 As shown, the plurality of protrusions 313 of the printing platform 311 are at least partially embedded in the hollow portion 319, as shown in FIG. Figure 3-4 shown.

[0060] The hollow portion 319 of the separation plate 314 has the same cross-sectional shape as the protrusion 313 of the printing platform 311. The shapes of the printing platform 311 and the separation plate 314 that are easy to separate are selected according to the shapes of different printing substrates and 3D printed products 500. In one embodiment, the hollow portion 319 is in the shape of parallel strip-shaped slots, such as Figure 3-4 In other embodiments, the shape of the hollow portion 319 is a polygonal mesh, such as a triangular mesh, a quadrilateral mesh, a hexagonal mesh, etc. Figure 5a-5c As shown. Accordingly, Figure 3-5, the protrusion 313 of the printing platform 311 and the hollow portion 319 of the separation plate 314 have corresponding shapes. When the hollow portion 319 is in the shape of parallel strip-shaped slots, the protrusion 313 is a corresponding plurality of long strip structures arranged at intervals. When the hollow portion 319 is in the shape of a polygonal grid, the protrusion 313 is a plurality of cylindrical or polygonal columnar structures arranged at intervals.

[0061] The driving device is used to drive the printing platform 311 and the separation plate 314 to produce relative displacement, wherein the relative displacement can be relative translation or relative rotation. When the relative displacement is relative translation, both ends of the separation plate 314 are freely connected to the printing platform 311, and the separation plate 314 is directly driven to move relative to the printing platform 311 by the driving device, such as by setting a cylinder, a hydraulic cylinder, a screw, etc., and a limit device is not required at this time; when the relative movement is relative rotation, one end of the separation plate 314 is rotationally connected to the printing platform 311, such as Figure 7-9 As shown, the separation plate 314 is directly driven to rotate relative to the printing platform 311 by a driving device, such as a motor and a reduction mechanism, and a limit device does not need to be provided at this time.

[0062] The drive device also includes a limit device. When the relative displacement is a relative translation, see Figure 6 , both ends of the separation plate 314 are freely connected to the printing platform 311, a limiting device is provided, and the printing platform 311 is driven downward by the driving device, and the separation plate 314 is stopped by the limiting device; when the relative movement is relative rotation, one end of the separation plate 314 is rotationally connected to the printing platform 311, a limiting device is provided, and the printing platform 311 is driven downward by the driving device, and the separation plate 314 is stopped by the limiting device. In one embodiment, the limiting device is a limiting block 317, such as Figure 6-1 As shown in FIG. 3 , when the driving device drives the printing platform 311 to move downward, at least one end of the separation plate 314 stops on the upper surface of the limit block 317 .

[0063] At least one end of the separation plate 314 extends beyond the corresponding end surface of the printing platform 311, see Figure 2 The limit block 317 is disposed below the separation plate 314. Figure 6-9 As shown, when the printing platform 311 drives the separation plate 314 to descend, the limit block 317 limits the separation plate 314 from at least one side, restricting the separation plate 314 from continuing to move downward. As the printing platform 311 continues to descend, the separation plate 314 and the printing platform 311 move relative to each other, so that the 3D printed product 500 is separated from the printing platform 311.

[0064] One or more separation plates 314 are provided, and the upper surface of the limit block 317 is non-planar, as shown in FIG13, so that the limit block 317 has different thicknesses at different positions. During the separation process, when different separation plates 314 are limited, the contact timing between the separation plates 314 at different positions and the limit block 317 is different. The position with a larger thickness contacts the separation plate 314 first. There is a sequence of separation operations, which can effectively reduce the separation force. In other embodiments, the non-planar shape is a step-by-step increasing (decreasing) step, a trapezoid or a wave shape, see Figures 13a-13d .

[0065] like Figure 8-9 As shown, it also includes a scraper plate 318, which is arranged above the printing platform 311 and can move horizontally relative to the printing platform 311. The scraper plate 318 is substantially perpendicular to the raised upper surface 312. Specifically, when the separation plate 314 and the printing platform 311 move relative to each other, the 3D printed product 500 is separated from the printing platform 311. At this time, the 3D printed product 500 is located on the separation plate 314 and is not adhered to the separation plate 314. Then the printing platform 311 moves upward. The separation plate 314 is affected by gravity and the upper stopper 316, and its hollow portion 319 is again engaged with the protrusion 313. At this time, the 3D printed product 500 falls onto the raised upper surface 312 again. The scraper plate 318 located above the printing platform 311 moves along the surface of the printing platform 311, further scrapes the 3D printed product 500 completely off the printing platform 311, and pushes it to the unloading port (not shown in the figure) for unloading.

[0066] The mounting frame is provided with a first horizontal driving mechanism (not shown in the figure), and the scraper plate 318 is driven by the first horizontal driving mechanism to reciprocate horizontally on the raised upper surface 312. The mounting frame is also provided with a second horizontal driving mechanism (not shown in the figure), and the scraper plate 320 is driven by the second horizontal driving mechanism to move horizontally to flatten the resin solution on the printing platform 311. The first horizontal driving mechanism and the second horizontal driving mechanism can be a threaded screw mechanism, a belt mechanism, etc.

[0067] The limit block 317 is arranged on the back of the scraper plate 318, that is, the limit block 317 can move horizontally with the scraper plate 318. Figure 9-11As shown, during the separation process, the printing platform 311 drives the separation plate 314 to descend to an appropriate position, and the first horizontal driving mechanism drives the limit block 317 to move to a position below the edge of the printing platform 311 to limit the separation plate 314 from further descending, and then the printing platform 311 continues to descend to separate the printing platform 311 from the separation plate 314. Since the limit block 317 and the scraper plate 318 function independently of each other and do not function at the same time, the two are integrated so that the limit block 317 and the scraper plate 318 use the same set of driving mechanisms, saving space while reducing the cost of the equipment. In another embodiment, the limit block 317 can also be fixed at a specific position of the mounting frame or the resin tank 200.

[0068] Different resin materials have different viscosities and adhesions. In order to achieve a good separation effect for a variety of resin materials as much as possible, the applicant uses different types of resin materials for different separation distances d (such as Figure 6 , 9 As shown, the descent distance of the printing platform and the separation success rate were tested, and the experimental results are as follows:

[0069] Table 1 Comparison of separation performance of different resin materials and different separation distances

[0070]

[0071] It can be seen that the separation device 310 and the 3D printing device 10 of the utility model can be applied to photosensitive resin substrates with a viscosity of 150-3000 pcs, and have a good separation success rate. In particular, after setting a sufficient separation distance, such as 40 mm, the separation success rate can reach 100%.

[0072] Since the vertical projection area of ​​the printing platform 311 is approximately fixed, when the number / area of ​​the separation plates 314 increases, the area of ​​the corresponding raised upper surface 312 will be smaller, and the bearing surface area will be smaller, that is, there is a certain proportional relationship between the area of ​​the separation plate 314 and the area of ​​the bearing surface, see Table 2, the smaller the ratio, the smaller the number / area of ​​the separation plates 314, the larger the area of ​​the bearing surface, the better the support for the 3D printed product 500, and the easier it is to print, but the separation force is large and it is not easy to separate; the larger the ratio, the more the number / area of ​​the separation plates 314, the smaller the area of ​​the bearing surface, the smaller the separation force, and the easier it is to separate successfully.

[0073] The applicant conducted experiments on the yield rate under different area ratios, and obtained the following experimental results, wherein the hollow portion 319 of the separation plate is shaped like parallel strip grooves, the protrusions 313 of the printing platform 311 are correspondingly multiple spaced long strip structures, and the number of strip rods constituting the separation plate 311 is the same as the number of protrusions 313, that is, the width relationship between the strip rods and the protrusions 313 can be mapped to the ratio of the bearing surface of the separation plate 311 and the printing platform 311.

[0074] Table 2 Experimental results of the influence of different area relationships on yield

[0075]

[0076] Taking into account factors such as separation time and yield rate, the ratio of the area of ​​the separation plate 314 to the area of ​​the bearing surface is set to 1:1-1:5.

[0077] If the width of the hollow portion 319 and the separation plate 314 is too wide, the bearing surface of the protrusion 313 will not provide sufficient support for the 3D printed product 500, affecting the printing quality. If the width of the hollow portion 319 and the separation plate 314 is too narrow, the separation plate 314 will easily cut the 3D printed product 500 during the separation operation. Similarly, if the separation plate 314 and the protrusion 313 are too thick, the separation operation will take more time, affecting the printing efficiency. If the separation plate 314 and the protrusion 313 are too thin, the rigidity of the separation plate 314 cannot be guaranteed, and the separation plate 314 will easily bend during the separation operation. Therefore, the groove width, groove depth, width and thickness of the separation plate 314 are reasonably determined according to the size of the 3D printed product 500, printing material and printing efficiency.

[0078] When the separation plate 314 is fully engaged with the protrusion 313 of the printing platform 311, if the upper surface 315 of the separation plate 314 is set flush with the upper surface 312 of the protrusion on the printing platform 311, the overall strength of the printing platform 311 is good, the bearing surface is relatively flat and it is easy to print and shape, but the 3D printed product 500 is easy to adhere to the separation plate 314 during printing and is not easy to separate. Therefore, in order to facilitate separation, the upper surface 315 of the separation plate 314 is usually set lower than the upper surface 312 of the protrusion on the printing platform 311, such as Figure 4 As shown in Table 3, as the height difference between the separation plate 314 and the raised upper surface 312 increases, although it will cause discontinuity of the bearing surface, it can significantly improve the success rate of the separation operation. Therefore, when the separation plate 314 is completely embedded in the printing platform 311, the height difference h between the upper surface 315 of the separation plate 314 and the raised upper surface 312 on the printing platform 311 is 0-20 mm.

[0079] Table 3 Effect of the height difference between the separation plate 314 and the raised upper surface 312 on the separation success rate

[0080] Groove depth between protrusions (mm) 5 6 7 10 Separation plate thickness (mm) 5 5 5 5 Height difference (mm) 0 1 2 5 Separation success rate (%) 50 90 100 100

[0081] In order to prevent the separation plate 314 from being deformed, high-strength materials such as 40Cr steel, S136 steel or 45# steel are required.

[0082] The printing and separation unloading process of the 3D printing device 10 of the present invention is as follows:

[0083] Driven by the platform lifting drive mechanism, the separation device 310 moves downward along the vertical guide mechanism and is immersed in the resin solution contained in the resin tank 200, so that the resin solution above the printing platform 311 is approximately one printing thickness. The second horizontal drive mechanism drives the scraper 320 to scrape the resin solution flat, and then the ultraviolet irradiation device of the printing device 300 performs regional irradiation according to the preset printing drawing of the 3D printed product 500. The resin solution is solidified on the raised upper surface 312 on the printing platform 311, that is, the bearing surface. Then the platform lifting drive mechanism drives the separation device 310 to move downward by one printing thickness again, and ultraviolet irradiation and curing are performed again. The above operations are repeated to print out a complete 3D printed product 500, and then the platform lifting drive mechanism moves to When the limit block 317 is at a height near the limit block 317, the first horizontal driving mechanism drives the limit block 317 to move to a position below the edge of the printing platform 311. The printing platform 311 descends to separate the printing platform 311 from the separation plate 314, completing the separation of the 3D printed product 500 from the printing platform 311. The platform lifting driving mechanism drives the separation device 310 to rise. The separation plate 314 is embedded in the groove between the protrusions 313 on the printing platform 311 under the action of gravity and the upper stop block 316. Then, the height of the printing platform 311 is adjusted so that the lower surface of the scraper plate 318 is in contact with the bearing surface. The first horizontal driving mechanism drives the scraper plate 318 to move above the printing platform 311, completely scrapes the 3D printed product 500 off the printing platform 311, and pushes it to the unloading port to complete the unloading.

[0084] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A separation device for unloading 3D printed products, characterized in that: include: A printing platform, wherein a protrusion is provided on the surface of the printing platform, and an upper surface of the protrusion forms a bearing surface for a 3D printed product; A separation plate, the separation plate having a hollow portion, the protrusion of the printing platform at least partially embedded in the hollow portion; The driving device is used to drive the printing platform and the separation plate to produce relative displacement.

2. The separation device for unloading 3D printed products according to claim 1, characterized in that: The driving device also includes a limiting device for limiting the relative displacement of the printing platform and the separation plate.

3. The separation device for unloading 3D printed products according to claim 2, characterized in that: The limiting device is a limiting block.

4. The separation device for unloading 3D printed products according to claim 3, characterized in that: It also includes a scraper plate, which is arranged above the printing platform and is used to further scrape the 3D printed product away from the printing platform.

5. The separation device for unloading 3D printed products according to claim 4, characterized in that: The limiting block is arranged on the back side of the scraper plate.

6. The separation device for unloading 3D printed products according to any one of claims 3-4, characterized in that: The upper surface of the limit block is in a trapezoidal, wavy or other non-planar shape for adjusting the separation and has a stepped shape.

7. The separation device for unloading 3D printed products according to claim 1, characterized in that: The separation plate is provided in one or more pieces.

8. The separation device for unloading 3D printed products according to claim 1, characterized in that: The protrusions of the printing platform are multiple and arranged at intervals, and the protrusions are in the shape of long strips, cylinders or polygonal columns.

9. The separation device for unloading 3D printed products according to claim 8, characterized in that: The shape of the hollow portion of the separation plate is the same as the cross-sectional shape of the protrusion of the printing platform.

10. The separation device for unloading 3D printed products according to claim 1, characterized in that: The ratio of the area of ​​the separation plate to the area of ​​the bearing surface is 1:1-1:

5.

11. The separation device for unloading 3D printed products according to claim 1, characterized in that: The upper surface of the separation plate is flush with or lower than the bearing surface of the printing platform.

12. The separation device for unloading 3D printed products according to claim 11, characterized in that: The upper surface of the separation plate is 0-20 mm lower than the surface of the printing platform.

13. A 3D printing device, comprising a printing device, characterized in that: The printing device has a separation device for unloading 3D printed products as described in any one of claims 1-12.

14. The 3D printing device according to claim 13, characterized in that: The printing device also includes an ultraviolet light irradiation device.

15. The 3D printing device according to claim 14, characterized in that: The 3D printing device also includes a control system, a frame and a resin tank. The frame includes a base and a mounting frame arranged above the base. The resin tank is arranged on the upper plane of the base. The printing device is arranged on the mounting frame. The control system controls the printing device to automatically complete printing and unloading operations.

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