Heated bed and 3D printer

Abstract

A heated bed (100) and a 3D printer. The heated bed (100) comprises a bed plate (10), a support member (20), elastic leveling devices (30) and locking assemblies (40), wherein the support member (20) is arranged on one side of the bed plate (10); the elastic leveling devices (30) connect the bed plate (10) to the support member (20) and are configured to adjust the levelness of the bed plate (10); and the locking assemblies (40) connect the bed plate (10) to the support member (20) and are configured to lock the position of the bed plate (10) relative to the support member (20) after the bed plate (10) has been leveled.

Description

heated beds and 3D printers

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 2025201061218, filed with the China National Intellectual Property Administration on January 15, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of 3D printing technology, and more particularly to a heated bed and a 3D printer. Background Technology

[0004] 3D printing, also known as additive manufacturing, is a technology that uses digital model files as a basis and employs adhesive materials to construct parts layer by layer. During the 3D printing process, the molten adhesive material extruded by the 3D printer's print head comes into contact with the printing panel. The levelness of the printing panel is a key factor in improving print quality. In related technologies, even after the printing panel is leveled using a leveling device, its relatively poor rigidity can lead to deformation during use, potentially reducing print quality.

[0005] Utility Model Content

[0006] This application provides a heated bed and a 3D printer.

[0007] The heated bed in this embodiment is used for a 3D printer, and the heated bed includes:

[0008] bed board;

[0009] A support member is disposed on one side of the bed board;

[0010] An elastic leveling device, connected to the bed board and the support member, is used to adjust the flatness of the bed board; and

[0011] A locking assembly, which connects the bed board and the support member, is used to lock the position of the bed board relative to the support member after the bed board is leveled.

[0012] In the heated bed described above, the locking component is used to lock the position of the bed board relative to the support member after the bed board is leveled. This can reduce the deformation and displacement of the bed board, improve the overall rigidity of the heated bed, and thus improve the printing quality of the 3D printer.

[0013] In some embodiments, the locking assembly includes a limiting member and a locking member, the limiting member being disposed on the bed board and abutting against the support member, the locking member connecting the limiting member and the support member, the limiting member and the locking member cooperating to restrict the degree of freedom of the bed board relative to the support member in a first direction, the first direction being the same as the thickness direction of the bed board.

[0014] In some embodiments, the limiting member includes a first sub-member, the first sub-member having a first through hole, the locking member passing through the first through hole along a second direction and inserted into the support member, the second direction being perpendicular to the first direction.

[0015] In some embodiments, the first sub-component is sheet-like or plate-like, the length direction of the first sub-component extends along the first direction, and the tensile strength of the first sub-component along the first direction is greater than the tensile strength along the second direction.

[0016] In some embodiments, the limiting member includes a second sub-member spaced apart from the first sub-member. The second sub-member includes a first limiting portion and a second limiting portion connected to the first limiting portion. The first limiting portion abuts against the support member along the first direction. The second limiting portion is connected to the bed board and abuts against the support member along the second direction or is spaced apart from the support member. The second sub-member is L-shaped or Z-shaped. The stiffness of the second sub-member along the first direction is weaker than the stiffness of the first sub-member.

[0017] In some embodiments, the first limiting portion is provided with a second through hole, and the locking member passes through the second through hole along the first direction and is inserted into the support member.

[0018] In some embodiments, there are multiple first sub-components and one second sub-component. The multiple first sub-components and the second sub-components are arranged at intervals along the circumference of the bed board, and at least some of the first sub-components are located at the edge of the bed board.

[0019] In some embodiments, the bed board is rectangular, and the number of the plurality of first sub-components at the corresponding edge positions of the bed board is equal.

[0020] In some embodiments, the support member includes multiple support segments, which are connected end to end and extend circumferentially along the bed board. The multiple support segments together form a closed-loop structure with a continuous cross-section through the limiting member and the bed board.

[0021] In some embodiments, the support member is generally U-shaped, and along a cross section perpendicular to the bed board, the cross section of the support segment is U-shaped, with the opening of the U-shaped support segment facing the bed board.

[0022] In some embodiments, the heated bed includes a heating element and an insulation element, the heating element being at least partially disposed within the insulation element and thermally connected to the bed board, the insulation element enclosing the heating element and a portion of the bed board.

[0023] In some embodiments, the elastic leveling device includes an elastic element and an adjusting element. The elastic element is disposed between the bed board and the support member. The adjusting element connects the bed board and the support member. The support member has a screw hole. One end of the adjusting element has a thread. The adjusting element passes through the bed board and one end of the adjusting element is screwed into the screw hole, thereby adjusting the position between the bed board and the support member to level the bed board.

[0024] The 3D printer according to the embodiments of this application includes the heated bed described in any of the above embodiments.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0027] Figure 1 is a three-dimensional schematic diagram of the heated bed according to an embodiment of this application;

[0028] Figure 2 is a perspective view of the heated bed according to an embodiment of this application from another angle;

[0029] Figure 3 is a perspective view of the heated bed according to an embodiment of this application from another angle;

[0030] Figure 4 is an exploded view of the heated bed according to an embodiment of this application;

[0031] Figure 5 is a partial schematic diagram of the heated bed in Figure 3;

[0032] Figure 6 is a partial perspective view of the heated bed according to an embodiment of this application;

[0033] Figure 7 is a perspective view of the support member according to an embodiment of this application;

[0034] Figure 8 is a plan view of the heated bed according to an embodiment of this application;

[0035] Figure 9 is a schematic cross-sectional view of the heated bed in Figure 8 along direction II;

[0036] Figure 10 is another plan view of the heated bed according to an embodiment of this application;

[0037] Figure 11 is a schematic cross-sectional view of the heated bed in Figure 10 along the II-II direction;

[0038] Figure 12 is an enlarged schematic diagram of the heated bed III section of Figure 11;

[0039] Figure 13 is a perspective view of the bed board and heating element combined according to an embodiment of this application;

[0040] Figure 14 is a plan view of the bed board and heating element combined according to an embodiment of this application;

[0041] Figure 15 is a plan view of the heating element according to an embodiment of this application;

[0042] Figure 16 is another plan view of the heating element according to an embodiment of this application;

[0043] Figure 17 is a thermal simulation cloud diagram of a bed board according to one embodiment of this application;

[0044] Figure 18 is a schematic diagram of the thermal simulation cloud of the bed board in the related technology.

[0045] Explanation of reference numerals in the attached drawings: 100-Heated bed, 10-Bed board, 11-Board body, 12-First heat-conducting rib, 13-Limiting rib, 131-Receiving groove, 14-Heat conductor, 15-Second heat-conducting rib, 20-Supporting component, 21-Supporting section, 22-Closed-loop structure, 23-Screw hole, 30-Elastic leveling device, 31-Elastic component, 32-Adjusting component, 40-Locking assembly, 41-Limiting component, 411-First sub-component, 4111-First through hole, 412-Second sub-component, 4121-First limiting part, 4122-Second limiting part, 4123-Second through hole, 42-Locking component, 1 01-Printing panel, 102-Flexible layer, 50-Heating element, 501-First power terminal, 502-Second power terminal, 51-First heating segment, 52-Second heating segment, 53-Third heating segment, 54-Fourth heating segment, 55-Fifth heating segment, 56-Sixth heating segment, 57-Seventh heating segment, 58-Eighth heating segment, 59-Ninth heating segment, 591-First arc segment, 592-Second arc segment, 593-Third arc segment, 60-Insulation element, W-First direction, Y-Second direction, Z1-First planar direction, Z2-Second planar direction. Detailed Implementation

[0046] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0047] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0051] Please refer to Figures 1-4. The heated bed 100 of this embodiment is used for a 3D printer, or in other words, the 3D printer includes the heated bed 100. The heated bed 100 includes a bed board 10, a support member 20, an elastic leveling device 30, and a locking assembly 40. The support member 20 is disposed on one side of the bed board 10; the elastic leveling device 30 connects the bed board 10 and the support member 20 and is used to adjust the flatness of the bed board 10; the locking assembly 40 connects the bed board 10 and the support member 20 and is used to lock the position of the bed board 10 relative to the support member 20 after the bed board 10 is leveled.

[0052] In the heated bed 100 of the above embodiment, the locking component 40 is used to lock the position of the bed board 10 relative to the support member 20 after the bed board 10 is leveled. This can reduce the deformation and displacement of the bed board 10, improve the overall rigidity of the heated bed 100, reduce the deformation of the heated bed 100 when using a large-size heated bed 100, and thus improve the printing quality of the 3D printer.

[0053] Specifically, the bed 10 is mainly used to support the printing material. For example, as shown in Figure 4, the heated bed 100 may also include a printing panel 101 and a flexible layer 102, with the flexible layer 102 disposed between the printing panel 101 and the bed 10. The flexible layer 102 is, for example, a soft magnetic sticker, which can attach the printing panel 101 to the bed 10. During the printing process, the bed 10 can transfer heat to the printing panel 101 through the flexible layer 102, thereby heating the printing material located on the printing panel 101.

[0054] In one embodiment, the printing panel 101 can also be attracted by embedding magnets or magnetic materials in the bed board 10, thus eliminating the need for the flexible layer 102. This application does not impose any limitations on this.

[0055] The overall outline of the bed board 10 can be square, for example, it can be rectangular or square. The bed board 10 can be made of thermally conductive materials such as metal, for example, the material of the bed board 10 can be aluminum alloy. The bed board 10 can be a solid plate, or it can be a die-cast part, a stamped part, or an extruded part, etc.

[0056] The support member 20 is used to support the bed board 10 and reinforce the bed board 10, reducing the deformation of the bed board 10 that would affect the printing quality. The support member 20 can be made of a material with high rigidity, such as galvanized sheet, stainless steel, aluminum alloy, etc.

[0057] The elastic leveling device 30 adjusts the flatness of the bed board 10, which can keep the bed board 10 in a horizontal state, improve the positional stability of the printing material, and thus improve the printing quality.

[0058] The locking component 40 can lock the bed plate 10 after it has been leveled. In other words, after leveling, the bed plate 10 is difficult to move relative to the support member 20, thus stabilizing its position. Since the support member 20 reinforces the bed plate 10, this reduces the probability of deformation of the bed plate 10, increases the overall rigidity of the heated bed 100, and makes the heated bed 100 itself less prone to deformation. This, in turn, ensures accurate positioning of the material output from the 3D printer, improving print quality.

[0059] Referring to Figures 3 and 5, in some embodiments, the locking assembly 40 includes a limiting member 41 and a locking member 42. The limiting member 41 is disposed on the bed board 10 and abuts against the support member 20. The locking member 42 connects the limiting member 41 and the support member 20. The limiting member 41 and the locking member 42 cooperate to restrict the degree of freedom of the bed board 10 relative to the support member 20 in a first direction W, which is the same as the thickness direction of the bed board 10.

[0060] Thus, the limiting member 41 and the locking member 42 cooperate to prevent the bed board 10 from moving in the first direction W after leveling, thereby locking the bed board 10. Specifically, the limiting member 41 can be fixed to the bed board 10 by welding, threaded connection, or the limiting member 41 can be integrally formed with the bed board 10 by die casting. The limiting member 41 abuts against the support member 20, and the locking member 42 connects the limiting member 41 and the support member 20, so that the support member 20 can limit the bed board 10 through the limiting member 41 and the locking member 42.

[0061] As shown in Figure 4, the first direction W is the same as the thickness of the bed board 10. When the heated bed 100 is in normal use, since the bed board 10 is arranged horizontally, the thickness of the bed board 10 is in the vertical direction. At this time, the first direction W is in the vertical direction. That is to say, with the cooperation of the limiting member 41 and the locking member 42, the first bed board 10 is difficult to move in the vertical direction.

[0062] Please refer to Figures 5 and 6. In some embodiments, the limiting member 41 includes a first sub-member 411, which has a first through hole 4111. The locking member 42 passes through the first through hole 4111 along the second direction Y and is inserted into the support member 20. The second direction Y is perpendicular to the first direction W.

[0063] Thus, after the locking member 42 passes through the first through hole 4111 and is inserted into the support member 20, the first sub-member 411 can be fixedly connected to the support member 20. Since the first sub-member 411 is connected to the bed board 10, the bed board 10 is fixed relative to the support member 20, thereby restricting the bed board 10 relative to the support member 20 in the first direction W.

[0064] The first component 411 is sheet-like or plate-like, extending along the first direction W. The tensile strength of the first component 411 along the first direction W is greater than its tensile strength along the second direction Y. In other words, the first component 411 has a larger tensile strength along its length, thus ensuring the high rigidity and resistance to deformation of the heated bed 100 along the first direction W, thereby guaranteeing the flatness of the heated bed 100 along the first direction W. However, its tensile strength in the second direction Y is weaker, thus it can absorb deformation during the heating and cooling process of the heated bed 100, preventing the heated bed 100 from bending and deforming in the first direction W due to internal stress caused by thermal expansion and contraction, which would affect its flatness.

[0065] Specifically, the first sub-component 411 can abut against the outer side of the support member 20, the locking member 42 can be a screw, the support member 20 can be provided with a threaded hole, and the locking member 42 can be screwed into the threaded hole on the support member 20 to make the connection between the locking member 42 and the support member 20 stable.

[0066] As discussed above, the first direction W can be vertical. Therefore, during normal use of the heated bed 100, the second direction Y can be horizontal.

[0067] Referring to Figures 5 and 6, in some embodiments, the first through hole 4111 is an elongated hole or an oblong hole, and the length of the first through hole 4111 extends along the first direction W. Since the first sub-component 411 is fixedly connected to the bed board 10, during the leveling process of the bed board 10, the first sub-component 4111 will move with the bed board 10 in the first direction W, and the position of the first through hole 4111 will also change accordingly. Thus, the first through hole 4111 is an elongated hole or an oblong hole, so that the first through hole 4111 can adapt to different positions of the bed board 10, thereby allowing the locking member 42 to be inserted into the support member 20.

[0068] An elongated hole is longer than its width. An elongated hole can be rectangular or similar in shape. An oblong hole is a hole with semi-circular ends in the first direction W; the dimension of an oblong hole in the first direction W is also greater than its dimension in the second direction Y.

[0069] Please refer to Figures 5 and 6. In some embodiments, the limiting member 41 includes a second sub-member 412 spaced apart from the first sub-member 411. The second sub-member 412 includes a first limiting portion 4121 and a second limiting portion 4122 connected to the first limiting portion 4121. The first limiting portion 4121 abuts against the support member 20 along the first direction W. The second limiting portion 4122 is connected to the bed board 10 and abuts against the support member 20 along the second direction Y or is spaced apart from the support member 20. The second sub-member 412 is L-shaped or Z-shaped. The stiffness of the second sub-member 412 along the first direction W is weaker than the stiffness of the first sub-member 411.

[0070] Thus, the second limiting part 4122 is connected to the bed board 10, allowing the second sub-part 412 to be fixed together with the bed board 10. The second limiting part 4122 abuts against the support member 20 along the second direction Y, and the first limiting part 4121 abuts against the support member 20 along the first direction W. This allows the second sub-part 412 to remain stable relative to the support member 20, thereby further restricting the movement of the bed board 10 relative to the support member 20 along the first direction W and the second direction Y, improving the positional stability of the bed board 10, and providing pre-positioning during assembly, thus facilitating leveling and fixing of the first sub-part 411.

[0071] Furthermore, the second sub-component 412 has an L-shaped or Z-shaped structure, making it easy to connect the second sub-component 412 to the bed board 10 and the limiting member 41. For example, when the second sub-component 412 has an L-shaped structure, the first limiting part 4121 is plate-shaped and arranged horizontally, and the second limiting part 4122 is plate-shaped and arranged vertically. The second sub-component 412 has a Z-shaped structure, which means that the second sub-component 412 has two horizontal pieces (e.g., the second limiting part 4122) and one vertical piece (e.g., the first limiting part 4121), and the vertical piece connects the two horizontal pieces.

[0072] The second sub-component 412 has a weaker stiffness along the first direction W than the first sub-component 411. This means the second sub-component 412 is more prone to deformation along the first direction W. The first limiting portion 4121 of the second sub-component 412 can absorb the deformation caused by thermal expansion and contraction of the bed plate 10, making the shape of the bed plate 10 more stable and thus improving the printing effect of the 3D printer. Furthermore, the first limiting portion 4121 of the second sub-component 412 can provide pre-positioning during assembly of the heated bed 100.

[0073] Referring to Figure 5, in some embodiments, the first limiting part 4121 is provided with a second through hole 4123, and the locking member 42 passes through the second through hole 4123 along the first direction W and is inserted into the support member 20. Thus, the locking member 42 passes through the second through hole 4123 and is inserted into the support member 20, which further improves the stability of the second sub-part 412 in limiting the bed board 10. Specifically, the depth of the second through hole 4123 extends along the first direction W. After the bed board 10 is leveled, the locking member 42 can lock the first limiting part 4121 onto the support member 20 along the first direction W, thereby fixing the second sub-part 412 to the support member 20.

[0074] It should be noted that there are multiple locking elements 42, and the multiple locking elements 42 correspond to different first sub-element 411 and second sub-element 412 respectively.

[0075] Please refer to Figure 6. In some embodiments, there are multiple first sub-components 411 and one second sub-component 412. The multiple first sub-components 411 and second sub-components 412 are arranged at intervals along the circumference of the bed board 10, and at least some of the first sub-components 411 are arranged at the edge of the bed board 10.

[0076] Thus, the cooperation of multiple first sub-components 411 and one second sub-component 412 can limit the bed board 10 at different positions, improving the stability of the bed board 10 and thereby increasing the rigidity of the heated bed 100. In addition, at least some of the first sub-components 411 are located at the edge of the bed board 10, so that the first sub-components 411 will not affect other structures of the bed board 10, ensuring the normal use of the bed board 10.

[0077] In one example, there are six first sub-components 411, which are spaced apart circumferentially along the bed board 10. In order to make the bed board 10 more evenly stressed, the resultant force of the forces exerted by the six first sub-components 411 and one second sub-component 412 on the bed board 10 is located at the center of the bed board 10.

[0078] Referring to Figure 6, in some embodiments, the bed board 10 is rectangular, and the number of multiple first sub-components 411 at the corresponding edge positions of the bed board 10 is equal. Alternatively, the number of first sub-components 411 is equal at the edge positions of the bed board 10 where they are located. In one example, the bed board 10 has four edges, with two first sub-components 411 at each of the three edges of the bed board 10. This uniform distribution of the multiple first sub-components 411 improves the stability of the connection between the bed board 10 and the support member 20, thereby increasing the overall rigidity of the heated bed 100.

[0079] In some embodiments, the stiffness of the first sub-component 411 along the second direction Y is less than its stiffness along the first direction W. Specifically, as discussed above, the first direction W can be a vertical direction, and the second direction Y can be a horizontal direction. Since the first sub-component 411 can be positioned at the edge of the bed plate 10, it constrains the bed plate 10 at its edge. After the bed plate 10 is heated, it can deform along the horizontal direction. If the constraint force of the first sub-component 411 on the bed plate 10 in the horizontal direction is large, the edge of the bed plate 10 will be roughly fixed. As a result, the bed plate 10 will arch and deform in the middle, compromising its flatness and reducing the printing quality of the 3D printer.

[0080] Therefore, the stiffness of the first sub-component 411 along the second direction Y is less than that along the first direction W, making the first sub-component 411 easier to deform in the second direction Y. This absorbs the deformation of the bed board 10 along the second direction Y after being heated, resulting in better flatness of the bed board 10 and thus improving the printing quality of the 3D printer.

[0081] Please refer to Figures 7-9. In some embodiments, the support member 20 includes multiple support segments 21. The multiple support segments 21 are connected end to end and extend along the circumference of the bed board 10. The multiple support segments 21 together with the bed board 10 through the limiting member 41 form a closed loop structure 22 with a continuous cross section.

[0082] Thus, multiple support segments 21, together with the bed plate 10 and the limiting member 41, form a closed-loop structure 22 with a continuous cross-section. This allows the support member 20 to be connected to the bed plate 10 as a whole through the limiting member 41, thereby improving the rigidity of the heated bed 100. Specifically, the multiple support segments 21 can be an integral structure. For example, the multiple support segments 21 can be manufactured by processes such as stamping, and the multiple support segments 21 are connected end to end, so that the support member 20 can form a ring.

[0083] As shown in Figure 9, the path of the closed-loop structure 22 can be bed board 10 → one of the limiting members 41 → support section 21 → the other limiting member 41 → bed board 10.

[0084] Please refer to Figures 3, 4 and 7. In some embodiments, the support member 20 is generally U-shaped, and along the cross section perpendicular to the bed board 10, the cross section of the support section 21 is U-shaped, with the opening of the U-shaped support section 21 facing the bed board 10.

[0085] Thus, the U-shaped support member 20 can improve the overall rigidity of the support member 20 itself, and can also support the four corners of the bed board 10, thereby increasing the rigidity at the four corners of the bed board 10 and reducing the risk of deformation of the bed board 10. In addition, the cross-section of the support section 21 is U-shaped, which not only improves the rigidity of the support member 20, but also increases the volume of the closed-loop structure 22, which is conducive to the closed-loop structure 22 accommodating more structural components.

[0086] Please refer to Figures 3 and 4. In some embodiments, the heated bed 100 includes a heating element 50 and an insulation element 60. The heating element 50 is at least partially disposed within the insulation element 60 and is thermally connected to the bed board 10. The insulation element 60 encloses the heating element 50 and part of the bed board 10.

[0087] Thus, the heating element 50 can heat the bed board 10, allowing the bed board 10 to transfer heat to the printing material. The heating element 50 is at least partially disposed within the insulation element 60, which at least partially passes through the support element 20, thereby improving the structural compactness of the heated bed 100. The insulation element 60 encloses the heating element 50, meaning it can cover the heating element 50, thereby reducing heat dissipation from the heating element 50 and improving the heating efficiency of the heating element 50 on the bed board 10.

[0088] Specifically, the heating element 50 can be a resistance heating component such as a heat pipe, heating wire, or heating plate. The insulation element 60 can be made of low thermal conductivity materials such as polyurethane foam, fiberglass, or plastic. The insulation element 60 can be fixed to the bed board 10 by means of adhesive, screws, or clips. The limiting member 41 on the bed board 10 passes through the insulation element 60 and connects to the support member 20.

[0089] Please refer to Figures 10-12. In some embodiments, the elastic leveling device 30 includes an elastic element 31 and an adjusting element 32. The elastic element 31 is disposed between the bed board 10 and the support member 20. The adjusting element 32 connects the bed board 10 and the support member 20. The support member 20 is provided with a screw hole 23. One end of the adjusting element 32 is provided with a thread. The adjusting element 32 passes through the bed board 10, and one end of the adjusting element 32 is screwed into the screw hole 23, thereby adjusting the position between the bed board 10 and the support member 20 to level the bed board 10.

[0090] Thus, during the process of screwing the adjusting member 32 into the screw hole 23, it can drive the bed board 10 to move downward and cause the elastic member 31 to be in a compressed state; during the process of screwing the adjusting member 32 out of the screw hole 23, the elastic member 31 elastically deforms and pushes the bed board 10 to move upward. With the cooperation of the adjusting member 32 and the elastic member 31, the flatness of the bed board 10 can be adjusted.

[0091] Specifically, the elastic element 31 is, for example, a coil spring, and the adjusting element 32 is, for example, a screw. After the adjusting element 32 is screwed into the screw hole 23, the elastic element 31 is in a compressed state. To facilitate operation of the adjusting element 32, the adjusting element 32 can be screwed into the screw hole 23 from top to bottom.

[0092] There are at least three elastic elements 31 and at least three adjusting elements 32, and the elastic elements 31 and adjusting elements 32 are arranged in a one-to-one correspondence. At least three adjusting elements 32 are arranged at different vertices of the virtual polygon, or in other words, the positions of at least three adjusting elements 32 can define a plane, so that the bed board 10 can be adjusted to be in a horizontal state by adjusting the adjusting elements 32 at different positions.

[0093] Please refer to Figures 13-15. In some embodiments, the heating element 50 is strip-shaped and is thermally connected to the bed board 10. The heating element 50 includes a first heating section 51, a second heating section 52, a third heating section 53, a fourth heating section 54, a fifth heating section 55, and a sixth heating section 56. There is at least one third heating section 53. The first heating section 51, the second heating section 52, at least one third heating section 53, and the fourth heating section 54 are arranged sequentially at intervals along the first plane direction Z1 and all extend along the second plane direction Z2. The first plane direction Z1 intersects the second plane direction Z2. The first heating section 51 is located on one side adjacent to the bed board 10.

[0094] The fifth heating section 55 and the second heating section 52 are connected to each other at one end near the center of the bed board 10. The fifth heating section 55 extends from the second heating section 52 toward the first heating section 51. The fifth heating section 55 forms a first electrical terminal 501 of the heating element 50. The first electrical terminal 501 is spaced apart from the first heating section 51. The sixth heating section 56 is spaced apart from the fifth heating section 55 along the second plane direction Z2.

[0095] The sixth heating section 56 and the third heating section 53 near the first heating section 51 are connected to each other at the center near the bed board 10. The sixth heating section 56 extends from the third heating section 53 near the first heating section 51 toward the first heating section 51. The sixth heating section 56 forms a second electrical terminal 502 of the heating element 50. The second electrical terminal 502 is spaced apart from the first heating section 51.

[0096] In the above embodiment, the first heating segment 51, the second heating segment 52, at least one third heating segment 53, and the fourth heating segment 54 are arranged sequentially at intervals along the first plane direction Z1 and all extend along the second plane direction Z2. This allows for a reasonable arrangement of the heating segments in the first plane direction Z1. Since the heating element 50 is an integral strip, the terminals of the heating element 50 need to be close together. At this time, the sixth heating segment 56 and the fifth heating segment 55 are arranged at intervals along the second plane direction Z2, and the first electrical terminal 501 and the second electrical terminal 502 face the first heating segment 51. This allows for a reasonable arrangement of the fifth heating segment 55 and the sixth heating segment 56 in the second plane direction Z2, reducing the large area formed between the heating segments that would result in a lower temperature. Therefore, by reasonably arranging the positions of the first heating segment 51, the second heating segment 52, the third heating segment 53, the fourth heating segment 54, the fifth heating segment 55, and the sixth heating segment 56, an asymmetrical arrangement structure is formed for each heating segment, and the heating of the bed board 10 by the heating element 50 is more uniform, thereby improving the printing quality.

[0097] Specifically, the bed board 10 is generally square, with the first plane direction Z1 extending in the same direction as one of the edges of the bed board 10, and the second plane direction Z2 extending in the same direction as the other edge. The first to sixth heating sections are also strip-shaped, and the extension direction of the heating section is the length direction of the heating section.

[0098] Both the first power terminal 501 and the second power terminal 502 face the first heating section 51. After the first power terminal 501 and the second power terminal 502 are energized, the heating element 50 can generate heat, thereby heating the bed board 10.

[0099] Referring to Figures 14-16, in some embodiments, the heating element 50 includes a seventh heating section 57, an eighth heating section 58, and a ninth heating section 59. The seventh heating section 57 is connected to the first heating section 51 and the second heating section 52.

[0100] When there is only one third heating section 53, the eighth heating section 58 connects the third heating section 53 and the fourth heating section 54.

[0101] When there are multiple third heating sections 53 and multiple eighth heating sections 58, some of the eighth heating sections 58 connect multiple third heating sections 53 end to end, and one of the eighth heating sections connects the third heating sections 53 and the fourth heating section 54 that are close to each other.

[0102] The ninth heating section 59 connects the first heating section 51 and the fourth heating section 54. The seventh heating section 57, the fifth heating section 55, the sixth heating section 56 and the ninth heating section 59 are arranged sequentially along the second plane direction Z2.

[0103] Thus, the seventh heating section 57, the eighth heating section 58 and the ninth heating section 59 are connected to the corresponding heating sections, so that the heating element 50 forms a continuous structure, which is beneficial for the heating element 50 to heat the bed board 10 evenly.

[0104] Specifically, as shown in Figure 15, when there is one third heating section 53, there is also one eighth heating section 58, which is located on the side of the bed board 10.

[0105] When there are multiple third heating sections 53 and multiple eighth heating sections 58, some of the eighth heating sections 58 are located near one side of the bed board 10, and some are located near the center of the bed board 10. As shown in Figure 16, there are three third heating sections 53 and three eighth heating sections. One of the eighth heating sections 58 is located near the center of the bed board 10 and connects to two adjacent third heating sections 53. The other two eighth heating sections 58 are located near one side of the bed board 10. Of the two eighth heating sections 58 located near one side of the bed board 10, one eighth heating section 58 connects to the fourth heating section 54 and the third heating section 53 near the fourth heating section 54, and the other eighth heating section 58 connects to two adjacent third heating sections 53.

[0106] It is understood that in other embodiments, the number of the third heating section 53 and the eighth heating section 58 may also be an odd number greater than 3, such as 5 or 7.

[0107] The number of heating elements 50 can be one or more. When there are multiple heating elements 50, they are arranged side by side. In the example shown in Figure 14, there is one heating element 50. In the example shown in Figure 6, there are two heating elements 50.

[0108] Please refer to Figures 13 and 14. In some embodiments, the side of the bed board 10 that is thermally connected to the heating element 50 is made of a thermally conductive material with a thermal conductivity between 140 W / m*K and 180 W / m*K. In a cross section perpendicular to the axis of the heating element 50, the length of the contact profile between the heating element 50 and the bed board 10 is between 9.4 mm and 12 mm.

[0109] In this way, the heating element 50 heats the bed plate 10 more evenly, which can improve the printing quality of the 3D printer. Specifically, the thermal conductivity of the heat-conducting material can be 140 W / m*K, 150 W / m*K, 160 W / m*K, 170 W / m*K, 180 W / m*K, etc. The contact contour length between the heating element 50 and the bed plate 10 can be 9.4 mm, 10 mm, 10.5 mm, 11 mm, 12 mm, etc.

[0110] In one example, the heat-conducting material of the bed board 10 can be aluminum alloy, the heating element 50 is a round tube with a diameter of approximately 6.5 mm, and the semi-circular arc length of the heating element 50 in contact with the bed board 10 is approximately 10.2 mm.

[0111] Referring to Figures 14 and 15, in some embodiments, the distance between the third heating section 53 and the fourth heating section 54 along the first plane direction Z1 is A, and the range of A is 65mm-85mm. For example, A can be 65mm, 68mm, 70mm, 72mm, 80mm, 83mm, 85mm, etc. Thus, the appropriate distance between the third heating section 53 and the fourth heating section 54 ensures that the temperature of the bed board 10 surrounding the third heating section 53 and the fourth heating section 54 is within a preset temperature range, improving the temperature uniformity of the bed board 10.

[0112] It should be noted that A is the minimum distance between the third heating section 53 and the fourth heating section 54.

[0113] Referring to Figures 14 and 15, in some embodiments, the first heating section 51 and the fourth heating section 54 are arranged symmetrically about the center of the bed board 10 along the first plane direction Z1. The size of the bed board 10 is B, and the ratio A / B ranges from 0.18 to 0.25. For example, A / B can be values ​​such as 0.18, 0.19, 0.20, 0.22, and 0.25.

[0114] Furthermore, when A ranges from 65mm to 85mm, B can range from 260mm to 470mm. For example, the dimensions of B can be 260mm, 300mm, 242mm, 351mm, 395mm, 454mm, 470mm, etc. In this way, the ratio of A to B is appropriate, or in other words, the distance between the third heating section 53 and the fourth heating section 54 is appropriate, which can improve the heating uniformity of the bed board 10.

[0115] Referring to Figures 14 and 15, in some embodiments, the distance between the first heating section 51 and the fourth heating section 54 along the first plane direction Z1 is C, and the C / B ratio ranges from 0.8 to 0.90. For example, the C / B ratio ranges from 0.8, 0.83, 0.85, 0.90, etc. Thus, the distances between the first heating section 51 and the fourth heating section 54 and the corresponding sides of the bed board 10 are appropriate, resulting in a lower temperature difference between the edge and center of the bed board 10, thereby improving the heating uniformity of the bed board 10.

[0116] Please refer to Figures 14 and 15. In some embodiments, along the first plane direction Z1, the distance between the third heating segment 53 and the fourth heating segment 54 is A, and the distance between the first heating segment 51 and the second heating segment 52 is D, satisfying that D = (1.2-1.4)*A.

[0117] Since the first heating section 51, the second heating section 52, the fifth heating section 55, and the seventh heating section 57 are roughly arranged in a circle, the temperature of the area enclosed by the first heating section 51, the second heating section 52, the fifth heating section 55, and the seventh heating section 57 is affected by these four heating sections. Therefore, along the first plane direction Z1, the distance D between the first heating section 51 and the second heating section 52 is designed to be larger than the distance A between the third heating section 53 and the fourth heating section 54. This can make the temperature difference between different areas of the bed board 10 smaller and improve the heating uniformity of the heating element 50 on the bed board 10.

[0118] In one example, A ranges from 65mm to 85mm, therefore, D ranges from 78mm to 119mm. For example, D can be 78mm, 82mm, 85mm, 100mm, 110mm, 119mm, etc.

[0119] Referring to Figures 14 and 15, in some embodiments, at least one of the first heating section 51, the fourth heating section 54, the seventh heating section 57, the eighth heating section 58, and the ninth heating section 59 is spaced E from the edge of the bed board 10, where E ranges from 25mm to 35mm. With all heating sections 51, 54, 57, 58, and 59 positioned close to the bed board 10, and E ranging from 25mm to 35mm, the temperature difference between the edge and center of the bed board 10 is minimized, improving the heating uniformity of the bed board 10. Exemplarily, E can be 25mm, 27mm, 30mm, 32mm, 35mm, etc.

[0120] Referring to Figures 14 and 15, in some embodiments, the dimension of the bed board 10 along the first plane direction Z1 is B, and the ratio E / B is 0.07-0.1. For example, E / B can be 0.07, 0.08, 0.09, 0.1, etc. The range of E is 25mm-35mm, and the range of B is 260mm-470mm. This appropriate E / B distance results in a lower temperature difference between the edge and center of the bed board 10, improving the heating uniformity of the bed board 10.

[0121] Referring to Figures 14 and 15, in some embodiments, the distance between the sixth heating segment 56 and the ninth heating segment 59 along the second plane direction Z2 is F, where F ranges from 65mm to 85mm. For example, F can be 65mm, 68mm, 70mm, 72mm, 80mm, 83mm, 85mm, etc. This appropriate distance between the sixth heating segment 56 and the ninth heating segment 59 ensures that the temperature of the bed board 10 surrounding the sixth heating segment 56 and the ninth heating segment 59 remains within a preset temperature range, improving the temperature uniformity of the bed board 10.

[0122] Referring to Figures 14 and 15, in some embodiments, the distance between the fifth heating section 55 and the sixth heating section 56 along the second plane direction Z2 is G, and G / F is 0.9-1.1. For example, G / F can be 0.9, 0.95, 1.05, 1.1, etc. When F is 65mm-85mm, G can range from 58mm-94mm. For example, G can be 58mm, 60mm, 65mm, 70mm, 85mm, 94mm, etc. In this way, the dimensions of G and F are close, resulting in a smaller temperature difference in the region between the fifth heating section 55 and the sixth heating section 56, and in the region between the sixth heating section 56 and the ninth heating section 59, thereby improving the temperature uniformity of the heated bed 100.

[0123] Referring to Figures 14 and 15, in some embodiments, the distance between the fifth heating segment 55 and the seventh heating segment 57 along the second plane direction Z2 is H, and H / F is 1.5-1.7. Since the first heating segment 51, the second heating segment 52, the fifth heating segment 55, and the seventh heating segment 57 are approximately arranged in a closed loop, the temperature of the area enclosed by these four heating segments is affected by their combined temperature. Therefore, along the second plane direction Z2, the distance H between the fifth heating segment 55 and the seventh heating segment 57 is set to be larger than the distance F between the sixth heating segment 56 and the ninth heating segment 59. This reduces the temperature difference between different areas of the bed board 10, improving the heating uniformity of the bed board 10 by the heating element 50.

[0124] In one example, F ranges from 65mm to 85mm, therefore H ranges from 97mm to 145mm. For example, H can be 97mm, 100mm, 105mm, 130mm, 138mm, 145mm, etc.

[0125] Please refer to Figures 13-15. In some embodiments, the connection between the second heating segment 52 and the fifth heating segment 55 is transitioned by the first arc segment 591, the connection between the third heating segment 53 and the sixth heating segment 56 is transitioned by the second arc segment 592, and the connection between the fourth heating segment 54 and the ninth heating segment 59 is transitioned by the third arc segment 593. The bed board 10 includes a board body 11 and a first heat-conducting rib 12 disposed on one side of the heat-conducting connection surface of the board body 11. The first heat-conducting rib 12 connects the first arc segment 591, the second arc segment 592, and the third arc segment 593.

[0126] In this way, the first heat-conducting rib 12 can connect multiple heating sections and transfer heat from the higher temperature area to the lower temperature area, resulting in a lower temperature difference between different areas of the bed board 10 and improving the temperature uniformity of the bed board 10.

[0127] Specifically, the plate 11 and the first heat-conducting rib 12 can be integrally formed. The plate 11 can be a square structure as a whole, and the first heat-conducting rib 12 can extend along the diagonal direction of the plate 11. The first arc segment 591, the second arc segment 592 and the third arc segment 593 are arranged along the diagonal direction of the plate 11.

[0128] Please refer to Figures 13-15. In some embodiments, the bed board 10 includes a board body 11 and a limiting rib 13 disposed on one side of the heat-conducting connection surface of the board body 11. The limiting rib 13 forms a receiving groove 131, in which the heating element 50 is accommodated.

[0129] Thus, the limiting rib 13 can restrict the position of the heating element 50, making the heating element 50 stable in connection with the bed board 10 and improving the heating effect of the heating element 50 on the bed board 10. Specifically, the size and shape of the receiving groove 131 can be matched with the heating element 50 to increase the connection area between the heating element 50 and the bed board 10 and improve the heating efficiency of the heating element 50 on the bed board 10.

[0130] Referring to Figures 13-15, in some embodiments, a heat conductor 14 is provided in the receiving groove 131, and the heat conductor 14 connects the limiting rib 13 and the heating element 50. Thus, the heat conductor 14 can improve the efficiency of heat conduction from the heating element 50 to the bed plate 10, thereby improving the heating efficiency of the heating element 50. In one example, the heat conductor 14 is, for example, thermal grease, which is in a paste form and can increase the connection area between the limiting rib 13 and the heating element 50.

[0131] Referring to Figures 13-15, in some embodiments, the bed board 10 includes a second heat-conducting rib 15 disposed on the surface of the board body 11. The second heat-conducting rib 15 connects different areas of the board body 11, and the second heat-conducting rib 15 and the limiting rib 13 are located on the same side of the board body 11. In this way, the second heat-conducting rib 15 can transfer heat from the higher temperature area to the lower temperature area, resulting in a lower temperature difference between different areas of the bed board 10 and improving the temperature uniformity of the bed board 10.

[0132] Specifically, the second heat-conducting rib 15 can extend along the first plane direction Z1 or along the second plane direction Z2. There can be multiple second heat-conducting ribs 15, and multiple second heat-conducting ribs 15 are arranged in a cross pattern, so that the temperature difference at various positions of the bed board 10 is low.

[0133] In summary, in one example, as shown in Figure 17, which is a thermal simulation cloud diagram of the bed board 10 according to one embodiment of this application, after the heating element 50 heats the bed board 10, the highest temperature of the bed board 10 is about 100°C and the lowest temperature is about 95°C. The temperature difference is less than or equal to 5°C, which is small, and the temperature uniformity of the bed board 10 is good.

[0134] As shown in Figure 18, which is a schematic diagram of thermal simulation of the bed board in the related technology, after the heating element heats the bed board, the highest temperature of the bed board is about 102℃ and the lowest temperature is about 90℃, with a temperature difference of about 12℃. The temperature difference is large and the temperature uniformity of the bed board is poor.

[0135] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0136] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A heated bed for a 3D printer, characterized in that, The heated bed includes: bed board; A support member is disposed on one side of the bed board; An elastic leveling device, connected to the bed board and the support member, is used to adjust the flatness of the bed board; and A locking assembly, which connects the bed board and the support member, is used to lock the position of the bed board relative to the support member after the bed board is leveled.

2. The heated bed according to claim 1, characterized in that, The locking assembly includes a limiting member and a locking member. The limiting member is disposed on the bed board and abuts against the support member. The locking member connects the limiting member and the support member. The limiting member and the locking member cooperate to restrict the degree of freedom of the bed board relative to the support member in a first direction, which is the same as the thickness direction of the bed board.

3. The heated bed according to claim 2, characterized in that, The limiting member includes a first sub-member, the first sub-member having a first through hole, the locking member passing through the first through hole along a second direction and inserted into the support member, the second direction being perpendicular to the first direction.

4. The heated bed according to claim 3, characterized in that, The first sub-component is sheet-like or plate-like, and its length direction extends along the first direction. The tensile strength of the first sub-component along the first direction is greater than its tensile strength along the second direction.

5. The heated bed according to claim 3, characterized in that, The limiting member includes a second sub-member spaced apart from the first sub-member. The second sub-member includes a first limiting part and a second limiting part connected to the first limiting part. The first limiting part abuts against the support member along the first direction. The second limiting part is connected to the bed board and abuts against the support member along the second direction or is spaced apart from the support member. The second sub-member is L-shaped or Z-shaped. The stiffness of the second sub-member along the first direction is weaker than the stiffness of the first sub-member.

6. The heated bed according to claim 5, characterized in that, The first limiting part is provided with a second through hole, and the locking member passes through the second through hole along the first direction and is inserted into the support member.

7. The heated bed according to claim 5, characterized in that, There are multiple first sub-components and one second sub-component. The multiple first sub-components and the multiple second sub-components are arranged at intervals along the circumference of the bed board, and at least some of the first sub-components are located at the edge of the bed board.

8. The heated bed according to claim 7, characterized in that, The bed board is rectangular, and the number of the plurality of first sub-components at the corresponding edge positions of the bed board is equal.

9. The heated bed according to claim 2, characterized in that, The support member includes multiple support segments, which are connected end to end and extend circumferentially along the bed board. The multiple support segments together form a closed-loop structure with a continuous cross-section through the limiting member and the bed board.

10. The heated bed according to claim 9, characterized in that, The support member is generally U-shaped, and along the cross section perpendicular to the bed board, the cross section of the support section is U-shaped, with the opening of the U-shaped support section facing the bed board.

11. The heated bed according to claim 9, characterized in that, The heated bed includes a heating element and an insulation element. The heating element is at least partially disposed within the insulation element and is thermally connected to the bed board. The insulation element encloses the heating element and part of the bed board.

12. The heated bed according to claim 1, characterized in that, The elastic leveling device includes an elastic element and an adjusting element. The elastic element is disposed between the bed board and the support member. The adjusting element connects the bed board and the support member. The support member has a screw hole. One end of the adjusting element has a thread. The adjusting element passes through the bed board and one end of the adjusting element is screwed into the screw hole, thereby adjusting the position between the bed board and the support member to level the bed board.

13. A 3D printer, characterized in that, Includes the heated bed as described in any one of claims 1-12.

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