Printing platform and three-dimensional printer

Abstract

The application discloses a printing platform and a three-dimensional printer. The printing platform comprises a flat plate, the flat plate has a bearing surface, the bearing surface has a printing area and an edge area located at the side of the printing area, the printing area is used for bearing a forming workpiece, and a stopper is arranged in the edge area, the stopper is used for preventing the forming workpiece from drifting away from the printing platform. In the technical scheme of the printing platform, the stopper is arranged in the edge area of the printing platform, so that the stopper can block the workpiece flowing to the edge area in the process that the printing platform rises to the liquid level of the source liquid, the forming workpiece is prevented from drifting away from the printing platform along with the flow of the liquid resin, the forming workpiece is prevented from falling into the tank, and the scraping and collecting efficiency of the forming workpiece is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of three-dimensional printers, in particular to a printing platform and a three-dimensional printer. BACKGROUND

[0002] Three-dimensional printing is a technology that uses powdered metal, plastic or light-cured resin and other materials that can be bonded to construct objects through layer-by-layer printing based on digital model files.

[0003] Stereolithography is an important branch of three-dimensional printing technology. It uses a laser of a specific wavelength and intensity to irradiate the surface of a liquid photosensitive resin, causing a layer of resin in a specific area of the surface to solidify. When the solidification of a layer is complete, the lifting platform is lowered by a certain distance, and a coating blade is used to evenly cover the solidified layer with a layer of liquid resin. The next layer is irradiated and solidified by laser, and the process is repeated until a three-dimensional workpiece is obtained.

[0004] After the three-dimensional workpiece is formed, it will be lifted by a lifting mechanism to disconnect the connection with the printing platform. Then the printing platform will rise to expose the source liquid surface to provide a material collection assembly to scrape and collect the workpiece. During the process of the printing platform rising towards the source liquid surface, the source liquid on the printing platform will flow back to the material tank from the periphery of the printing platform. The workpiece with small volume and density is easy to drift with the source liquid, causing the workpiece to drift away from the printing platform and fall into the material tank, affecting the scraping and collecting process of the workpiece. SUMMARY

[0005] The main purpose of the present application is to provide a printing platform and a three-dimensional printer, which aims to solve the technical problem that the workpiece is easy to drift away from the printing platform in the existing three-dimensional printer.

[0006] To achieve the above-mentioned purpose, the printing platform provided by the present application comprises:

[0007] a flat plate, the flat plate having a bearing surface, the bearing surface having a printing area and an edge area located at the side of the printing area, the printing area being used to bear the formed workpiece;

[0008] a stopper, provided in the edge area, the stopper being used to prevent the formed workpiece from drifting away from the printing platform.

[0009] Optionally, the number of stoppers is multiple, and the multiple stoppers are arranged at intervals along the extension direction of the side of the printing area.

[0010] Optionally, the spacing between two adjacent stoppers is set to be 1:1 to 3:1 in proportion to the size of the stopper along the arrangement direction thereof.

[0011] Optionally, the spacing between two adjacent stoppers is set to be 10mm to 15mm.

[0012] Optionally, the dimension of the stopper along its arrangement direction is 5-10 mm.

[0013] Optionally, the side of the stopper facing the printing area is provided with a convex arc surface.

[0014] Optionally, the stopper is a cylindrical piece.

[0015] Optionally, the number of the edge areas is multiple, and the multiple edge areas include two oppositely arranged first edge areas, the two first edge areas are respectively arranged at opposite two side edges of the printing area, and the two first edge areas are both provided with the stopper.

[0016] Optionally, the multiple edge areas further include two oppositely arranged second edge areas, the two second edge areas and the two first edge areas jointly enclose the printing area; the second edge area is provided with a through hole, the number of the through holes is multiple, the multiple through holes are arranged at intervals along the length direction of the second edge area, and the through hole is used for the limiting rod to pass through; the first through hole is the through hole closest to the first edge area in the multiple through holes, and the first stopper is the stopper closest to the second edge area in the multiple stoppers, and the spacing between the first through hole and the first stopper is 10-15 mm.

[0017] Optionally, the spacing between the adjacent two through holes and the dimension of the through hole along its arrangement direction are in a ratio of 1.2-2.

[0018] Optionally, the spacing between the adjacent two through holes is 12-16 mm.

[0019] Optionally, the dimension of the through hole along its arrangement direction is 7-10 mm.

[0020] Optionally, the spacing between the stopper and the printing area is 2-26 mm.

[0021] Optionally, the height of the stopper is 20-60 mm.

[0022] Optionally, the spacing between the stopper and the edge of the edge area away from the printing area is 2-26 mm.

[0023] The application further provides a three-dimensional printer, characterized in that the three-dimensional printer comprises a fixed plate, a tank and a printing platform, wherein the printing platform comprises a flat plate with a bearing surface, the bearing surface has a printing area and an edge area at the side of the printing area, the printing area is used for bearing a forming workpiece; a stopper is arranged at the edge area, the stopper is used for preventing the forming workpiece from drifting away from the printing platform; the tank is connected with the fixed plate and is used for containing a source liquid; and the printing platform is connected with the fixed plate and is used for bearing the forming workpiece.

[0024] In the technical scheme of the printing platform, the stopper is arranged at the edge area of the printing platform, so that the stopper can prevent the workpiece flowing to the edge area from drifting away from the printing platform during the process that the printing platform rises to the liquid level of the source liquid, thereby avoiding the forming workpiece from falling into the tank, and improving the scraping and collecting efficiency of the forming workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without any creative effort.

[0026] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of the printing platform of the application;

[0027] Figure 2 FIG. 2 is a structural schematic diagram of another embodiment of the printing platform of the application;

[0028] Figure 3 FIG. 3 is a side projection schematic diagram of an embodiment of the printing platform of the application; Figure 2

[0029] FIG. 4 is a partial enlarged view of position A in FIG. 3; Figure 4

[0030] FIG. 5 is a plan projection schematic diagram of an embodiment of the printing platform of the application; Figure 5 Figure 4 FIG. 6 is a partial enlarged view of position B in FIG. 5;

[0031] Figure 6 FIG. 7 is a bottom projection schematic diagram of an embodiment of the printing platform of the application;

[0032] Figure 7 Figure 6 FIG. 8 is a partial enlarged view of position C in FIG. 7.

[0033] EXPLANATION OF REFERENCE NUMBERS:

[0034] ​​

[0035]

[0036] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work under the premise that the embodiments in the present application fall within the protection scope of the present application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0039] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text is that it includes three parallel solutions. For example, “A and / or B” includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is also not within the protection scope of the present application.

[0040] The present application provides a printing platform 100 and a three-dimensional printer.

[0041] The three-dimensional printer of the present application is used to implement three-dimensional printing technology, which is an emerging manufacturing technology that uses computer three-dimensional design models as a blueprint, software layering and discrete numerical control forming systems, and laser beams, hot melt nozzles, and other means to layer by layer accumulate and bond special materials such as metal powder, ceramic powder, plastic, and cell tissue, and finally stack and form to manufacture a solid product. Unlike traditional manufacturing, which uses molds, milling, and other mechanical processing methods to shape and cut raw materials to produce finished products, three-dimensional printing technology converts three-dimensional entities into two-dimensional planes, which are processed and stacked layer by layer to greatly reduce the complexity of manufacturing. Therefore, this digital manufacturing mode has natural advantages such as simple process, low customization cost, and short production cycle, making it extend to a wider range of production personnel.

[0042] The three-dimensional printer of the present application can include a fixed plate, a trough, a printing platform 100, a lifting mechanism, and a material taking assembly.

[0043] The fixed plate is the overall frame of the three-dimensional printer; the trough is connected to the fixed plate, and the trough is used to hold the source liquid; the printing platform 100 is slidingly connected to the fixed plate, and the printing platform 100 is used to carry the formed parts. The light machine of the three-dimensional printer emits a laser beam to irradiate the source liquid, and the source liquid is solidified and formed on the printing platform 100. The fixed plate is the overall frame of the three-dimensional printer; the trough is connected to the fixed plate, and the trough is used to hold the source liquid; the printing platform 100 is slidingly connected to the fixed plate, and the printing platform 100 is used to carry the formed parts. The light machine of the three-dimensional printer emits a laser beam to irradiate the source liquid, and the source liquid is solidified and formed on the printing platform 100. The lifting mechanism is arranged at the bottom of the trough, and the lifting mechanism is used to lift the formed workpiece after passing through the printing platform 100; the material taking assembly is slidingly connected to the fixed plate, and the material taking assembly is used to scrape the formed workpiece from the printing platform 100.

[0044] In order to make the person skilled in the art have a more intuitive understanding of the three-dimensional printer 100 of the present application, the printing principle of the three-dimensional printer 100 of the present application will be explained with a specific implementation process as an example.

[0045] 1: The light machine platform emits a laser beam to irradiate the source liquid in the trough, and the source liquid is solidified and formed on the printing platform 100 to obtain the formed parts; 2: The printing platform 100 moves towards the bottom of the trough until the lifting mechanism is arranged in the printing platform 100, and the lifting mechanism applies force to the formed parts to separate the formed parts from the printing platform 100; 3: The material taking assembly sweeps the printing platform 100 to scrape the formed parts from the printing platform 100. The three-dimensional printer repeats steps 1 to 3 to realize the automatic production of the formed workpiece.

[0046] Please refer to Figure 1 and Figure 2 , Figure 1Structure diagram of a printing platform 100 according to an embodiment of the present application; Figure 2 Structure diagram of another printing platform 100 according to an embodiment of the present application. The printing platform 100 comprises a flat plate 10 having a bearing surface with a printing area 11 for bearing a forming workpiece and an edge area at the side of the printing area 11, and a stopper 20 arranged at the edge area to prevent the forming workpiece from drifting away from the printing platform 100.

[0047] The bearing surface of the flat plate 10, i.e. the upper surface of the flat plate 10, is used to bear the forming workpiece. The bearing surface comprises the printing area 11 at the middle and the edge area at the periphery of the printing area 11, and the workpiece is formed by printing in the printing area 11, which is provided with a plurality of through holes. The jacking mechanism comprises a plurality of jacks connected to the bottom of the trough, which are used to pass through the through holes when the printing platform 100 moves towards the bottom of the trough to jack up the forming workpiece.

[0048] After the workpiece is jacked up, the printing platform 100 moves upwards to expose the liquid level of the source liquid in the trough, so that the workpiece on the bearing surface can be scraped and collected by the taking assembly. During the upward movement of the printing platform 100, the source liquid above the printing platform 100 will flow back to the trough from the periphery of the printing platform 100. The workpiece in the printing area 11 will also drift towards the edge area under the action of the flow of the source liquid, and at this time the stopper 20 of the edge area can block the workpiece to prevent it from falling into the trough after further drifting away from the printing platform 100, thereby improving the scraping and collecting efficiency of the workpiece.

[0049] The stopper 20 can be a long strip structure continuously extending along the length direction of the edge area, or a block or column structure arranged at intervals along the length direction of the edge area, which is not limited here, as long as the top end of the stopper 20 is higher than the surface of the printing area 11 to block the workpiece in the printing area 11. The length direction of the edge area is the extension direction of the side edge of the printing area 11, if the side edge of the printing area 11 is an arc edge, the edge area extends in an arc shape, and if the side edge of the printing area 11 is a straight edge, the edge area extends in a straight line shape. If the stopper 20 is a long strip structure continuously extending along the length direction of the edge area, it may cause the source liquid above the printing platform 100 to be blocked by the stopper 20 during the upward movement of the printing platform 100 in the trough, so that the source liquid cannot flow normally, causing the printing platform 100 to have a large upward resistance and affecting the taking efficiency.

[0050] For example, as shown in Figure 2 and Figure 3 , the stopper 20 is a long strip structure continuously extending along the length direction of the edge area. Figure 3 The stopper 20 is a block structure arranged at intervals along the length direction of the edge area. Figure 2The local enlarged view of the middle A. The number of the stopper 20 is multiple, and the multiple stoppers 20 are arranged along the extension direction of the side edge of the printing area 11. The stopper 20 can be block-shaped or columnar, which is not limited here. The stopper 20 is arranged as multiple small-volume pieces arranged along the side edge of the printing area 11, so that a drainage channel can be formed between two adjacent stoppers 20, and thus the source liquid can flow back to the trough through the drainage channel during the rising of the printing platform 100, and the stopper 20 can effectively block the workpiece, thereby the workpiece can be blocked and the rising resistance of the printing platform 100 can be reduced, so as to improve the collection efficiency of the workpiece as a whole.

[0051] It can be understood that the interval between two adjacent stoppers 20 should be less than the minimum size of the workpiece, so as to prevent the workpiece from drifting away from the printing area 11 between two adjacent stoppers 20. For example, please refer to Figure 4 and Figure 5 , Figure 4 The side projection schematic view of an embodiment of the printing platform 100 of the present application; Figure 5 is Figure 4 The local enlarged view of the middle B. The interval D between two adjacent stoppers 20 is set to 10mm to 15mm, such as 10mm, 11mm, 12mm, 13mm, 14mm, 15mm. The interval D between two adjacent stoppers 20 is the width D of the drainage channel. If the width D of the drainage channel is less than 10mm, the drainage flow will be affected and the rising resistance of the printing platform 100 will be increased. If the width D of the drainage channel is greater than 15mm, it is difficult to block small workpieces. Therefore, the interval D between two adjacent stoppers 20 is set to 10mm to 15mm, which can reduce the rising resistance of the printing platform 100 and ensure the blocking effect of the workpiece.

[0052] The outer surface of the stopper 20 can be a plane or an arc surface. If the outer surface of the stopper 20 is a plane, the liquid flow will impact the surface of the stopper 20 and cannot flow smoothly from both sides of the stopper 20 during the drainage of the source liquid. For example, please refer to Figure 6 and Figure 7 , Figure 6 The bottom projection schematic view of an embodiment of the printing platform 100 of the present application; Figure 7 is Figure 6The local enlarged view at C. One side of the stopper 20 towards the printing area 11 is provided as a convex arc surface, which can guide and branch the source liquid flowing through, so that the source liquid flowing through the stopper 20 can flow away from both sides of the stopper 20 more smoothly, thereby improving the liquid draining effect during the rising of the printing platform 100. In addition, the convex arc surface can reduce the corners of the stopper 20 itself on the basis of smoothly branching the source liquid, so as to avoid the corners of the stopper 20 from bumping and deforming the workpiece. In actual application, the stopper 20 can be provided as a cylindrical piece to reduce the processing difficulty. In addition, the side of the cylindrical piece away from the printing area 11 is also a convex arc surface, so as to guide the source liquid to a certain extent to improve the liquid draining speed.

[0053] For example, as shown in FIG. 5, the height H of the stopper 20 is provided as 20 mm to 60 mm, such as 20 mm, 30 mm, 40 mm, 50 mm, 60 mm. The height H of the stopper 20 is the distance between the end of the stopper 20 and the bearing surface. If the height H of the stopper 20 is less than 20 mm, the workpiece is likely to cross the stopper 20 from above the stopper 20 when floating towards the edge area, which affects the stopping effect. If the height of the stopper 20 is greater than 60 mm, it is likely to hinder the material taking assembly from scraping the workpiece, which affects the material taking process. Therefore, the height H of the stopper 20 is provided as 20 mm to 60 mm, which can ensure the stopping effect on the workpiece and avoid affecting the material taking process.

[0054] For example, as shown in FIGS. Figure 2 and Figure 3 The number of the edge areas is multiple, and the multiple edge areas include two oppositely arranged first edge areas 12. The two first edge areas 12 are respectively arranged at opposite sides of the printing area 11, and the two first edge areas 12 are respectively provided with the stopper 20. The printing platform 100 is usually a square platform, i.e., the printing area 11 is a rectangular printing area 11, and the number of the edge areas is four, which are distributed at the four sides of the printing area 11. Among them, the two first edge areas 12 are opposite, the two second edge areas 13 are opposite, and the two first edge areas and the two second edge areas 13 together enclose the printing area 11. There are two groups of stoppers 20, which are respectively arranged at the two first edge areas 12 to block the workpieces floating towards the two first edge areas 12.

[0055] It should be noted that when the material taking assembly scrapes the workpiece, it moves along the length direction of the first edge area 12 above the printing area 11, i.e., the material taking assembly needs to pass through the two second edge areas 13 when sweeping across the printing area 11, so the two second edge areas 13 cannot be provided with the stopper 20 to ensure that the material taking assembly can smoothly scrape the workpiece.

[0056] As can be seen from the above embodiments, in the process of moving the printing platform 100 to the bottom of the tank, the workpiece is lifted by the ejector pin of the lifting mechanism. In the process of lifting the printing platform 100, in order to avoid the workpiece from drifting away from the printing platform 100 at the second edge area 13, a plurality of through holes 30 are arranged in the second edge area 13, the plurality of through holes 30 are arranged along the length direction of the second edge area 13, and the height of the lifting mechanism in the area of the second edge area 13 is greater than the limiting rod of the ejector pin. The through hole 30 is used for the limiting rod to pass out, and the top end of the limiting rod always protrudes from the bearing surface before the printing platform 100 leaves the liquid surface, so that the limiting rod can block the workpiece drifting to the second edge area 13 in the process of lifting the printing platform 100. When the printing platform 100 rises to leave the liquid surface, the bearing surface is higher than the limiting rod, that is, the limiting rod no longer protrudes from the second edge area 13, so as to smoothly pass through the material taking assembly.

[0057] As shown in the example, Figure 3 The first through hole 31 in the plurality of through holes 30 closest to the first edge area 12 is the first through hole 31, and the first stopper 21 in the plurality of stoppers 20 closest to the second edge area 13 is the first stopper 21. The spacing between the first through hole 31 and the first stopper 21 is 10mm to 15mm, such as 10mm, 11mm, 12mm, 13mm, 14mm, 15mm. In this way, the limiting rod can avoid touching the first stopper 21 after passing through the first through hole 31, and the workpiece can also be prevented from drifting away from the limiting rod and the first stopper 21. The number of first through holes 31 is four, which are respectively close to the four diagonal positions of the printing area 11, and the number of first stoppers 21 is four, which are respectively close to the four first through holes 31.

[0058] As an example, the spacing between two adjacent through holes 30 and the size of the through hole 30 along the arrangement direction are set to be 1.2 to 2. The ratio is the ratio of the liquid discharge interval of the second edge area 13 to the width of the liquid blocking part. The liquid discharge interval is not less than the width of the liquid blocking part, and does not exceed three times the width of the liquid blocking part. In this way, under the premise of effectively stopping the workpiece, the liquid discharge flow of the first edge area 12 in the process of lifting the printing platform 100 can be ensured, so as to ensure the lifting speed of the printing platform 100.

[0059] As an example, the spacing between two adjacent through holes 30 is set to be 12mm to 16mm, such as 12mm, 13mm, 14mm, 15mm, 16mm. In this way, the lifting resistance of the printing platform 100 can be reduced, and the blocking effect on the workpiece can be ensured. The size of the through hole 30 along the arrangement direction is set to be 7mm to 10mm, such as 7mm, 8mm, 9mm, 10mm.

[0060] As an example, Figure 5As shown, the size d of the stopper 20 along its arrangement direction is set to 5-10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm. If the stopper 20 is a cylindrical piece, the size d of the stopper 20 along its arrangement direction is the radial size of the stopper 20. If the size d of the stopper 20 along its arrangement direction is less than 5 mm, the structural strength of the stopper 20 is weak and is easy to be damaged, and a large number of stoppers 20 are needed to cover the side edges of the printing area 11, which is inconvenient for processing. If the size d of the stopper 20 along its arrangement direction is greater than 10 mm, the stopper 20 has a large blocking area for the flow of the source liquid, which easily reduces the flow rate of the source liquid and affects the rising process of the printing platform 100. Therefore, the size d of the stopper 20 along its arrangement direction is set to 5-10 mm, which can not only enhance the structural strength of the stopper 20 and reduce the processing difficulty of the stopper 20, but also reduce the impact on the drainage of the printing platform 100 in the rising process.

[0061] Specifically, the ratio of the distance D between two adjacent stoppers 20 to the size d of the stopper 20 along its arrangement direction is set to 1:1-3:1. The ratio of D to d is the ratio of the total size of the drainage channels to the total width of the stoppers 20. As can be seen, the width D of the drainage channel is not less than the width d of the stopper 20, and does not exceed three times the width d of the stopper 20. In this way, the drainage flow rate of the first edge area 12 in the rising process of the printing platform 100 can be ensured to ensure the rising speed of the printing platform 100 under the premise of effectively stopping the workpiece.

[0062] For example, as shown in FIG. 6, the stopper 20 is arranged in the form of a plurality of parallel lines. Figure 7 As shown, the distance L between the stopper 20 and the printing area 11 is set to 2-26 mm, such as 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 26 mm. If the distance L between the stopper 20 and the printing area 11 is less than 2 mm, the take-out assembly is likely to hit the stopper 20 when sweeping the printing area 11 to scrape the workpiece, which affects the scraping process. If the distance L between the stopper 20 and the printing area 11 is greater than 26 mm, part of the workpiece is likely to enter the edge area, which is difficult to be scraped by the take-out assembly. Therefore, the distance L between the stopper 20 and the printing area 11 is set to 2-26 mm, which can effectively ensure the scraping effect of the take-out assembly on the workpiece. For example, the distance between the stopper 20 and the edge of the edge area away from the printing area 11 is set to 2-26 mm. In this way, the source liquid can flow back to the tank more quickly after flowing through the stopper 20, and the structural stability of the stopper 20 can be ensured.

[0063] The above merely describes optional embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A printing platform, characterized by, The printing platform comprises: a flat plate having a bearing surface, the bearing surface having a printing area for bearing a forming workpiece and an edge area located at a side of the printing area; a stopper provided in the edge area, the stopper being used to prevent the forming workpiece from drifting away from the printing platform; the number of the stoppers is multiple, and the multiple stoppers are arranged at intervals along the extension direction of the side of the printing area; the number of the edge areas is multiple, and the multiple edge areas include two oppositely arranged first edge areas, the two first edge areas being respectively arranged at opposite sides of the printing area, and the two first edge areas are both provided with the stopper; the multiple edge areas also include two oppositely arranged second edge areas, the two second edge areas and the two first edge areas collectively enclosing the printing area; the second edge area is provided with a plurality of through holes, the multiple through holes being arranged at intervals along the length direction of the second edge area, and the through holes are used for the limiting rod of a lifting mechanism to pass through; the first through hole is the through hole closest to the first edge area in the multiple through holes, and the first stopper is the stopper closest to the second edge area in the multiple stoppers, the spacing between the first through hole and the first stopper being set to 10-15 mm; the spacing between the adjacent two stoppers is set to be proportional to the size of the stopper along the arrangement direction of the stopper at a ratio of 1:1-3:1; and the side of the stopper facing the printing area is provided as a convex arc surface.

2. The print platform of claim 1, wherein, The spacing between the adjacent two stoppers is set to 10-15 mm.

3. The print platform of claim 1, wherein, The size of the stopper along the arrangement direction of the stopper is set to 5-10 mm.

4. The print platform of claim 1, wherein, The stopper is a cylindrical piece.

5. The print platform of claim 1, wherein, The spacing between the adjacent two through holes is set to be proportional to the size of the through hole along the arrangement direction of the through hole at a ratio of 1.2-2.

6. The print platform of claim 5, wherein, The spacing between the adjacent two through holes is set to 12-16 mm.

7. The print platform of claim 5, wherein, The size of the through hole along the arrangement direction of the through hole is set to 7-10 mm.

8. The printing platform of any one of claims 1 to 4, wherein, The spacing between the stopper and the printing area is set to 2-26 mm.

9. The printing platform of any one of claims 1 to 4, wherein, The height of the stopper is set to 20-60 mm.

10. The printing platform of any one of claims 1 to 4, wherein, The spacing between the stopper and the edge of the edge area away from the printing area is set to 2-26 mm.

11. A three-dimensional printer, characterized by The three-dimensional printer comprises a fixing plate, a tank and the printing platform according to any one of claims 1-10, the tank being connected with the fixing plate and used for containing a source liquid, and the printing platform being connected with the fixing plate and used for bearing a forming workpiece.

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