Printing platform assembly and three-dimensional printer

Abstract

A printing platform assembly and a three-dimensional printer, which mainly aim to improve the leveling precision of three-dimensional printers. The printing platform assembly is applied to a three-dimensional printer, and comprises a printing platform, a mounting member, a first elastic member and a limiting member. The mounting member is movably arranged relative to the printing platform in a first direction; the first elastic member is arranged between the printing platform and the mounting member, and is configured to be compressed as the mounting member moves, so as to apply a pushing force to the printing platform; and the limiting member is connected to the mounting member and the printing platform, and is used for limiting the printing platform to move relative to the mounting member in a second direction.

Description

Printing platform assembly and 3D printer Technical Field

[0001] The utility model relates to the technical field of three-dimensional printing equipment, and in particular to a printing platform component and a three-dimensional printer. Background Art

[0002] Stereolithography 3D printers utilize the characteristic that photosensitive resin in a fluid state undergoes a polymerization reaction under light. The light source is irradiated according to the cross-sectional shape of the object to be formed, so that the fluid resin is solidified into a three-dimensional solid model.

[0003] To ensure the printing quality of the model, the printing platform is usually leveled before printing. For example, publication number CN209738285U discloses a leveling structure for a light-curing 3D printer. It specifically discloses that during the leveling operation, the cantilever descends until the printing platform is in contact with the LCD screen, and the stepper motor drives the driven gear, thereby driving the cam to rotate, so that the cam pushes one of the clips to enable the opening and closing jaws to hold the rotating ball tightly, thereby locking the printing platform.

[0004] During the above-mentioned leveling process, the printing platform relies on the cantilever to descend and contact the exposure screen. When the printing platform and the exposure screen contact, it is difficult for the printing platform and the exposure screen to fit completely together, and it is impossible to ensure that the printing platform and the exposure screen are parallel to each other, resulting in low leveling accuracy of the printer.

[0005] Utility Model Content

[0006] In view of this, an embodiment of the present invention provides a printing platform assembly and a three-dimensional printer, the main purpose of which is to improve the leveling accuracy of the three-dimensional printer.

[0007] In order to achieve the above-mentioned purpose, the present invention mainly provides the following technical solutions:

[0008] In one aspect, an embodiment of the present invention provides a printing platform assembly, which is applied to a 3D printer and includes:

[0009] Printing platform;

[0010] a mounting member, the mounting member being movably arranged relative to the printing platform along a first direction;

[0011] a first elastic member, the first elastic member being disposed between the printing platform and the mounting member and configured to be compressed as the mounting member moves to apply a thrust to the printing platform;

[0012] A limit member is connected to the mounting member and the printing platform, and is used to limit the movement of the printing platform relative to the mounting member along a second direction, and the angle between the first direction and the second direction is greater than 0 degree and less than 180 degrees.

[0013] On the other hand, an embodiment of the present invention provides a three-dimensional printer, including the aforementioned printing platform assembly.

[0014] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0015] The printing platform assembly and the three-dimensional printer provided by the embodiments of the present invention, when leveling, when the printing platform moves downward and contacts the exposure screen, since the mounting member is movably arranged relative to the printing platform along the first direction, the printing platform can continue to be pressed downward. At this time, the first elastic member will be compressed and apply a thrust to the printing platform, so that the printing platform and the exposure screen are better fitted, ensuring that the printing platform and the exposure screen are parallel to each other, thereby improving the leveling accuracy of the printer.

[0016] In addition, by setting a limiter, during the printing process, the limiter can limit the movement of the printing platform relative to the mounting member along the second direction, such as limiting the printing platform from shaking back and forth or left and right relative to the mounting member, thereby ensuring the printing quality of the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of a printing platform assembly provided by an embodiment of the present invention from a first viewing angle;

[0018] FIG2 is a schematic structural diagram of a printing platform assembly provided by an embodiment of the present invention from a second viewing angle;

[0019] FIG3 is a cross-sectional view of a printing platform assembly provided by an embodiment of the present invention in which a limiting member does not undergo elastic deformation;

[0020] FIG4 is a cross-sectional view of a limiter of a printing platform assembly according to an embodiment of the present invention undergoing elastic deformation;

[0021] FIG5 is a cross-sectional schematic diagram of a printing platform assembly provided by an embodiment of the present invention when the printing platform is leveled;

[0022] FIG6 is a cross-sectional schematic diagram of another printing platform assembly provided by an embodiment of the present invention when the printing platform is leveled.

[0023] FIG7 is a cross-sectional view of a printing platform assembly provided by an embodiment of the present invention when the printing platform is leveled and the printing platform is flush with the mounting member;

[0024] FIG8 is a schematic structural diagram of the first printing platform assembly provided by an embodiment of the present invention during leveling;

[0025] FIG9 is a schematic structural diagram of a second printing platform assembly during leveling provided by an embodiment of the present invention;

[0026] FIG10 is a schematic structural diagram of a third printing platform assembly during leveling provided by an embodiment of the present invention;

[0027] FIG11 is a schematic structural diagram of the fourth printing platform assembly provided by an embodiment of the present invention during leveling;

[0028] FIG12 is a schematic structural diagram of the fifth printing platform assembly during leveling provided by an embodiment of the present invention;

[0029] FIG13 is a schematic structural diagram of a sixth printing platform assembly during leveling provided by an embodiment of the present invention;

[0030] FIG14 is an exploded schematic diagram of a printing platform assembly provided by an embodiment of the present invention;

[0031] FIG15 is a schematic structural diagram of a printing platform assembly provided by an embodiment of the present invention when pressing down an exposure screen.

[0032] Description of reference numerals:

[0033] 1-printing platform; 2-mounting member; 3-first elastic member; 4-limiting member; 11-platform body; 12-connecting member; 21-through hole; 13-side wall; 14-accommodating space; 22-mounting column; 23-accommodating groove; 100-cantilever; 200-exposure screen. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention.

[0035] As shown in Figures 1, 2, 3, and 4, an embodiment of the present invention provides a printing platform assembly for use in a three-dimensional printer. The printing platform assembly includes: a printing platform 1; a mounting member 2, which is movably arranged relative to the printing platform 1 along a first direction. Specifically, the mounting member 2 can be a plate; a first elastic member 3, which is arranged between the printing platform 1 and the mounting member 2 and is used to be compressed as the mounting member 2 moves to apply a thrust to the printing platform 1; a limiting member 4, which is connected to the mounting member 2 and the printing platform 1 and is used to limit the movement of the printing platform 1 relative to the mounting member 2 along a second direction. The angle between the first direction and the second direction is greater than 0 degrees and less than 180 degrees. Figures 3 and 4 are cross-sectional views taken along the width direction of the printing platform assembly.

[0036] In an embodiment of the present invention, a limiter 4 is connected to the mounting member 2 and the printing platform 1, such that the limiter 4 can restrict the movement of the printing platform 1 relative to the mounting member 2 along a second direction. Specifically, the mounting member 2 can be connected to the liftable cantilever 100 of the 3D printer. The first direction can be the lifting direction of the cantilever 100, while the second direction can be a direction parallel to the plane of the mounting member 2, that is, the left-right direction or the front-back direction of the cantilever 100. The first and second directions are perpendicular or nearly perpendicular to each other. That is, during the printing process, the limiter 4 can limit the shaking of the printing platform 1 relative to the mounting member 2, thereby ensuring the printing quality of the model.

[0037] It can be understood that the limiting member 4 can not only limit the printing platform 1, but also connect the mounting member 2 and the printing platform 1 to prevent the mounting member 2 from detaching from the printing platform 1 under the elastic force of the first elastic member 3.

[0038] The printing platform assembly provided by the embodiment of the present invention, when leveling, see Figure 15, when the printing platform 1 moves downward and contacts the exposure screen 200, since the mounting member 2 is movably arranged relative to the printing platform 1 along the first direction, the mounting member 2 can continue to press down. At this time, the first elastic member 3 will be compressed and apply a thrust to the printing platform 1, so that the printing platform 1 and the exposure screen 200 are better fitted, ensuring that the printing platform 1 and the exposure screen 200 are parallel to each other, thereby improving the leveling accuracy of the printer.

[0039] In addition, by setting the limiter 4, it is achieved that during the printing process, the limiter 4 can limit the movement of the printing platform 1 along the second direction relative to the mounting member 2, such as limiting the shaking of the printing platform 1 back and forth and left and right relative to the mounting member 2, thereby ensuring the printing quality of the model.

[0040] It can be understood that while the limiting member 4 limits the printing platform 1, it does not affect the movement of the mounting member 2 relative to the printing platform 1 along the first direction. For example, the limiting member 4 can be a telescopic structure such as a telescopic rod, etc. When the fixing member moves along the first direction, the telescopic structure can be extended or shortened to allow the fixing member to move smoothly.

[0041] For the sake of structural simplicity and cost reduction, referring to Figures 4, 8 to 13, in an embodiment of the present invention, the limit member 4 can be a second elastic member, and the limit member 4 is used to undergo elastic deformation as the mounting member 2 moves; the printing platform 1 is used to reset when the limit member 4 recovers its deformation.

[0042] In the above embodiment, the stopper 4 can be a metal spring, such as a steel sheet. As the mounting member 2 moves in the first direction and presses downward against the exposure screen, the steel sheet elastically deforms with the movement of the fixing member. This not only ensures that the stopper 4 retains the printing platform 1 but also enables smooth movement of the fixing member. This results in a simple structure, low cost, and reliable operation. Furthermore, when the printing platform 1 leaves the exposure screen 200, the stopper 4 can recover its deformation, thereby causing the printing platform 1 to return to its original position.

[0043] In some embodiments, the limiting member 4 can be a sheet-like structure. When the limiting member 4 does not undergo elastic deformation, the plane where the limiting member 4 is located can be parallel to the plane where the mounting member 2 is located, so that the limiting member 4 can undergo elastic deformation in the first direction to level the printing platform 1, and limit the printing platform 1 in the second direction to prevent the printing platform 1 from shaking back and forth and left and right relative to the mounting member 2.

[0044] In the embodiment of the present invention, the number of the limiting member 4 can be at least one, and the limiting members 4 can be arranged at intervals on the mounting member 2 .

[0045] In the above embodiment, by setting the number of limiting members 4 to multiple and arranging them at intervals along the edge of the mounting member 2, during the printing process, multiple limiting members 4 can jointly apply force to the printing platform 1 to jointly limit the shaking of the printing platform 1 back and forth and left and right, thereby improving the limiting reliability of the limiting members 4 on the printing platform 1.

[0046] In other embodiments, multiple limiting members 2 may be spaced circumferentially along the edge of the mounting member 2 to further improve the reliability of the limiting member 4 in limiting the printing platform 1. Specifically, the mounting member 2 may be a quadrilateral plate structure, and the number of limiting members 4 may be four, with the four limiting members 4 correspondingly disposed at the four corners of the mounting member 2.

[0047] In an embodiment of the present invention, referring to Figures 3 and 4, the printing platform 1 may include a platform body 11 and at least one connecting member 12 connected to the platform body 11, at least one connecting member 12 extends toward the mounting member 2 and is circumferentially arranged on the platform body 11; one end of the limiting member 4 is connected to the mounting member 2, and the other end of the limiting member 4 is connected to the corresponding connecting member 12; the first elastic member 3 is arranged between the platform body 11 and the mounting member 2. In some other embodiments, the first elastic member 3 only needs to be arranged so that the platform body 11 and the mounting member 2 have a certain elastic force.

[0048] In some embodiments, by connecting multiple connecting members 12 extending toward the mounting member 2 on the platform body 11, the two ends of the limiting member 4 are correspondingly connected to the mounting member 2 and the connecting member 12, thereby realizing the limiting effect of the limiting member 4 on the entire printing platform 1, and the effect of connecting the mounting member 2 and the platform body 11 together. The structure is simple and reliable to use.

[0049] In some other embodiments, a plurality of connecting members 12 may be arranged at intervals along the circumferential edge of the platform body 11 to facilitate connection between the connecting members 12 and corresponding limiting members 4 .

[0050] Specifically, the connection between the stopper 4 and the mounting member 2, and between the stopper 4 and the connecting member 12, can be various. To facilitate maintenance of the printing platform 1 assembly, the stopper 4 and the mounting member 2, and between the stopper 4 and the connecting member 12, can be detachably connected, such as by bolts. Similarly, the connecting member 12 and the platform body 11 can also be detachably connected, such as by bolts.

[0051] In an embodiment of the present invention, the mounting member 2 and the connecting member 12 can be respectively connected to the limiting member 4 with bolts; the limiting member 4 is connected to the mounting member 2 through at least two first bolts, and the limiting member 4 is connected to the connecting member 12 through at least one second bolt.

[0052] In the above embodiment, at least two first bolts can fix the limit member 4 to the mounting member 2. Compared with the case where the limit member 4 is connected to the mounting member 2 by one bolt, the limit member 4 can be prevented from rotating relative to the mounting member 2 with the one bolt as the axis, thereby improving the reliability of the limit member 4 in limiting the printing platform 1.

[0053] In an embodiment of the present utility model, referring to Figures 2 and 3, at least one limiting groove 23 can be provided on the mounting member 2, and at least one limiting groove 23 is arranged at intervals on the mounting member 2; the limiting member 4 is arranged in the corresponding limiting groove 23, and the inner side wall of the limiting groove 23 is clearance-matched with the limiting member 4 to limit the movement of the limiting member 4 relative to the mounting member 2. If the limiting groove 23 is a waist-shaped groove, the limiting member 4 is arranged therein, which can achieve a better limiting effect. In this application, clearance fit means that the minimum spacing between the two is very small, such as the spacing can be between 0.01 mm and 0.1 mm. In some embodiments, the limiting groove 23 can limit the movement of the limiting member 4 relative to the mounting member 2 along the second direction. In some embodiments, the surface of the limiting member 4 can be kept flush with the surface of the mounting member 2.

[0054] In the above embodiment, a limit groove 23 is provided, and the inner side wall of the limit groove 23 is clearance-matched with the limit member 4, so that the limit groove 23 can limit the limit member 4 to limit the movement of the limit member 4 relative to the mounting member 2, thereby further improving the reliability of the limit member 4 in limiting the printing platform 1.

[0055] In the embodiment of the present invention, referring to Figures 3 and 4, a through hole 21 is provided at the bottom of the limiting groove 23; the connecting member 12 passes through the corresponding through hole 21 and is connected to the limiting member 4, and the mounting member 2 is used to move relative to the connecting member 12 through the through hole 21.

[0056] In the above embodiment, the connecting member 12 passes through the corresponding through-hole 21 and connects to the limiting member 4. During leveling, the printing platform 1 presses down on the exposure screen 200, and the mounting member 2 compresses the first elastic member 3 and moves downward through the through-hole 21 along the connecting member 12 until leveling is complete. During this process, the connecting member 12 serves to guide the movement of the mounting member 2, making the movement of the mounting member 2 smoother and more conducive to the compression of the first elastic member 3 and the application of thrust to the printing platform 1, thereby further facilitating the alignment of the printing platform 1 with the exposure screen. Specifically, the connecting member 12 may be a column to provide guidance for the mounting member 2.

[0057] It should be noted that there should be a sufficiently large gap between the through hole 21 and the connecting member 12 so that the mounting member 2 can move smoothly along the connecting member 12 through the through hole 21 .

[0058] In the embodiment of the present invention, referring to Figures 1, 2, and 3, the printing platform 1 may further include at least one side wall 13, which is connected to the platform body 11 and disposed around the mounting member 2. The mounting member 2 is loosely fitted with the side wall 13. This allows the mounting member 2 to prevent the side wall 13 from moving in the second direction, thereby preventing the printing platform 1 from moving in the second direction. This structural arrangement assists the limiting member 4 in limiting the position of the printing platform 1, thereby better preventing the printing platform 1 from rocking back and forth or left and right relative to the mounting member 2, thereby better ensuring the print quality of the model.

[0059] In the embodiment of the present invention, referring to Figures 5, 6 and 7, Figures 5, 6 and 7 are sectional views cut along the length direction of the printing platform assembly, and the end face of the mounting member 2 is clearance-fitted with the side wall 13, and the end face of the mounting member 2 is an outwardly convex arc surface.

[0060] In the above embodiment, during the leveling process, as the platform body 11 and the exposure screen 200 are fitted together, the cylinder 13 and the mounting member 2 may rotate relative to each other. During the rotation, since the end face of the mounting member 2 is an outwardly convex arc surface, the cylinder 13 can smoothly slide over the mounting member 2 through the arc surface of the mounting member 2 without interfering with the mounting member 2, thereby ensuring the smooth leveling of the printing platform 1.

[0061] In the embodiment of the present invention, two adjacent side walls 13 are connected to each other, and the multiple side walls 13 and the platform body 11 together form an accommodating space; the mounting member 2 , the first elastic member 3 , the limiting member 4 and the connecting member 12 are located in the accommodating space 14 .

[0062] In the above embodiment, the mounting member 2, first elastic member 3, stopper 4, and connector 12 are located within the accommodation space 14 enclosed by the sidewall 13 and the platform body 11. During printing, the barrel 13 prevents the photosensitive resin from flowing to the upper portion of the platform body 11 and backflowing, thereby ensuring normal printing of the model. Furthermore, the sidewall 13 also serves to protect the entire printing platform assembly.

[0063] In the above embodiment, for different design conditions of 3D printers, for the case where a higher liquid level of photosensitive resin is often used, the end of the multiple side walls 13 away from the platform body 11 can be a closed end, so as to prevent the photosensitive resin from flowing into the accommodating space 14, and in order to facilitate the backflow of the photosensitive resin, the end surface of the closed end can be an outwardly convex conical surface; or, for the case where a lower liquid level of photosensitive resin is generally used, the end of the multiple side walls 13 away from the platform body 11 can be an open end.

[0064] In the embodiment of the present invention, referring to Figures 3, 4, 5, and 6, the number of first elastic members 3 can be one or more. If the number of first elastic members 3 is one, the first elastic member 3 can be arranged as centrally as possible in the accommodating cavity, and the radius of the first elastic member 3 can be appropriately increased to balance the force. If the number of first elastic members 3 is multiple, the multiple first elastic members 3 are arranged at intervals. Specifically, the multiple first elastic members 3 are arranged at intervals along the circumferential edge of the platform body 11. The first elastic member 3 can be a spring. Moreover, the number of first elastic members 3 can be the same as the number of the aforementioned connecting members 12, and can be arranged adjacent to each other in a one-to-one correspondence. For example, the number of both can be four.

[0065] During leveling, when the printing platform 1 moves downward and presses down the exposure screen 200, the multiple first elastic members 3 will be compressed to varying degrees, so that the platform body 11 can be attached to and remain parallel to the exposure screen 200, thereby allowing the printing platform 1 to be quickly leveled.

[0066] Of course, the number of the first elastic member 3 may be only one, and the first elastic member 3 may be circumferentially arranged along the edge of the platform body 11 . For example, the first elastic member 3 may be a coil spring with a larger diameter, which is circumferentially arranged around the edge of the platform body 11 .

[0067] In the embodiment of the present invention, referring to Figures 3 and 4 , the first elastic member 3 may be a spring. A mounting slot is defined on one of the mounting member 2 and the printing platform 1. A mounting post 22 is connected to the other of the mounting member 2 and the printing platform 1, with the mounting post 22 facing the mounting slot. One end of the first elastic member 3 is sleeved onto the exterior of the mounting post 22, while the other end of the first elastic member 3 is inserted into the mounting slot. Specifically, the mounting post 22 or the mounting slot may be provided on the platform body 11.

[0068] In the above embodiment, the mounting groove can restrain the first elastic member 3 on the mounting member 2 or the platform body 11. The mounting post 22 not only restrains the first elastic member 3 on the mounting member 2 or the platform body 11, but also serves as a guide for the extension and retraction of the first elastic member 3, thereby ensuring smooth extension and retraction of the first elastic member 3. Moreover, this structural arrangement facilitates the assembly and removal of the first elastic member 3 from the printing platform assembly, facilitating maintenance of the printing platform assembly.

[0069] Specifically, for ease of use, the mounting post 22 may be connected to the mounting member 2 , and the mounting slot may be provided on the platform body 11 .

[0070] An embodiment of the present invention further provides a three-dimensional printer, comprising the aforementioned printing platform assembly.

[0071] The three-dimensional printer provided by the embodiment of the present invention includes the aforementioned printing platform assembly. Therefore, the three-dimensional printer includes all the beneficial effects of the aforementioned printing platform assembly, which will not be described in detail here.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A printing platform assembly, applied to a three-dimensional printer, comprising: Printing platform (1); A mounting member (2), the mounting member (2) being movably arranged relative to the printing platform (1) along a first direction; A first elastic member (3), the first elastic member (3) being arranged between the printing platform (1) and the mounting member (2) and being used to be compressed as the mounting member (2) moves so as to apply a thrust to the printing platform (1); A limit member (4), the limit member (4) being connected to the mounting member (2) and the printing platform (1), and being used for limiting the movement of the printing platform (1) relative to the mounting member (2) along a second direction, wherein an angle between the first direction and the second direction is greater than 0 degrees and less than 180 degrees.

2. The printing platform assembly according to claim 1, wherein: The limiting member (4) is a metal spring, and the angle between the first direction and the second direction is 90 degrees.

3. The printing platform assembly according to claim 1, wherein: The limiting member (4) is a second elastic member, and the limiting member (4) is used to undergo elastic deformation as the mounting member (2) moves; the printing platform (1) is used to reset when the limiting member (4) recovers its deformation.

4. The printing platform assembly according to claim 1, wherein: The number of the limiting member (4) is at least one, and the at least one limiting member (4) is arranged at intervals on the mounting member (2).

5. The printing platform assembly according to claim 4, wherein: The printing platform (1) comprises a platform body (11) and at least one connecting member (12) connected to the platform body (11), wherein the at least one connecting member (12) extends toward the mounting member (2) and is arranged at intervals on the platform body (11); One end of the limiting member (4) is connected to the mounting member (2), and the other end of the limiting member (4) is connected to the corresponding connecting member (12); The first elastic member (3) is arranged between the platform body (11) and the mounting member (2).

6. The printing platform assembly according to claim 5, wherein: The mounting member (2) and the connecting member (12) are respectively connected to the limiting member (4) by bolts; The limiting member (4) is connected to the mounting member (2) via at least two first bolts, and the limiting member (4) is connected to the connecting member (12) via at least one second bolt.

7. The printing platform assembly according to claim 5, wherein: At least one limiting groove (23) is formed on the mounting member (2), and the at least one limiting groove (23) is arranged at intervals on the mounting member (2); The limiting member (4) is arranged in the corresponding limiting groove (23), and the inner side wall of the limiting groove (23) is clearance-matched with the limiting member (4) to limit the movement of the limiting member (4) relative to the mounting member (2) along the second direction.

8. The printing platform assembly according to claim 7, wherein: The limiting groove (23) is a waist-shaped groove, and a through hole (21) is provided on the bottom of the limiting groove (23); The connecting member (12) passes through the corresponding through hole (21) and is connected to the limiting member (4); the mounting member (2) is used to move relative to the connecting member (12) through the through hole (21).

9. The printing platform assembly according to claim 5, wherein: The printing platform (1) further comprises at least one side wall (13), wherein the at least one side wall (13) is connected to the platform body (11) and is arranged around the mounting member (2); The mounting member (2) and the side wall (13) are clearance-matched; The end surface of the mounting member (2) is clearance-matched with the side wall (13), and the end surface of the mounting member (2) is an outwardly convex arc surface.

10. The printing platform assembly according to claim 9, wherein: Two adjacent side walls (13) are connected to each other, and at least one side wall (13) and the platform body (11) together form a receiving space (14); The mounting member (2), the first elastic member (3), the limiting member (4) and the connecting member (12) are located in the accommodating space (14).

11. The printing platform assembly according to claim 1, wherein: The number of the first elastic member (3) is at least one, and the at least one first elastic member (3) is arranged at intervals.

12. The printing platform assembly according to claim 1, wherein: The first elastic member (3) is a spring; A mounting groove is provided on one of the mounting member (2) and the printing platform (1), and a mounting column (22) is connected to the other of the mounting member (2) and the printing platform (1), wherein the mounting column (22) is opposite to the mounting groove; One end of the first elastic member (3) is sleeved on the outside of the mounting column (22), and the other end of the first elastic member (3) is inserted into the mounting groove.

13. A three-dimensional printer, comprising: A printing platform assembly as claimed in any one of claims 1 to 12.

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