3D printer hot bed and 3D printer

Abstract

The application provides a 3D printer hot bed and a 3D printer, a plurality of flexible connecting mechanisms are arranged on the hot bed body, the flexible connecting mechanisms comprise X-direction flexible connecting pieces and / or Y-direction flexible connecting pieces, the X-direction flexible connecting pieces and the Y-direction flexible connecting pieces can respectively elastically deform along preset stretching directions, the preset stretching directions are length directions and width directions of the hot bed body, the hot bed body can be expanded and extended along the length directions and / or the width directions at the back of the hot bed body, thermal deformation of the hot bed body generated in the direction perpendicular to the preset stretching directions is eliminated, and the problem that printing fails due to thermal deformation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, and further relates to a 3D printer hot bed and a 3D printer. BACKGROUND

[0002] Currently, when printing high-performance materials such as polyether ether ketone, polyether ketone ketone, polyphenylene sulfide and other high-performance materials, a cavity preheating method is usually used to reduce the temperature difference between the printing environment and the extruded material, so as to reduce the warping of the printed part. The traditional 3D printing hot bed is fixed on the Z-direction motion mechanism by screws, which will cause thermal deformation and assembly deformation, especially in large-size high-temperature 3D printers. The high-temperature hot bed supported by the Z-axis will deform horizontally along the X, Y and Z directions, resulting in a change in the distance between the nozzle and the hot bed, thereby causing printing failure and printing defects.

[0003] In existing products, most of the hot beds are fixed on the Z-direction motion mechanism by multiple screws. In order to reduce the weight, the hot bed material is generally aluminum alloy, and the thermal expansion coefficient of aluminum alloy is large, which will cause large thermal deformation at high temperature, resulting in printing problems. Patent CN112571797A discloses a hot bed made of carbon steel material. Compared with aluminum alloy, carbon steel has a lower thermal expansion coefficient, so it has a certain effect, but it is only limited to scenarios where the hot bed temperature is not high and the size is small. For high temperature and large size, the carbon steel material will also be affected by temperature and weight. Patent CN116214918A discloses a high-temperature 3D printing hot bed deformation tolerance structure, which compensates for the size change caused by the thermal expansion of the hot bed by fixing the hot bed support assembly and the motion device. It is especially suitable for aluminum alloy materials with large size and high thermal expansion coefficient. This device has a complex structure, large integration workload, and the gap in the motion device will cause poor hot bed precision. SUMMARY

[0004] In view of the problem of printing failure caused by the thermal deformation of the 3D printing hot bed in the vertical direction in the prior art, the purpose of the present application is to provide a 3D printer hot bed and a 3D printer. A plurality of flexible connection mechanisms are arranged on the hot bed body. When the hot bed body expands due to temperature rise, the flexible connection mechanisms can elastically deform along the length direction and / or the width direction of the hot bed body. After the hot bed body is heated, it extends along the length direction and / or the width direction, eliminating the thermal deformation of the hot bed body in the vertical direction and solving the problem of printing failure caused by thermal deformation.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A 3D printer hot bed comprises a hot bed body, a plurality of connecting members, and a plurality of flexible connecting mechanisms. The hot bed body is mounted on a 3D printer through the connecting members. The flexible connecting mechanisms are flexibly connected with the hot bed body and are configured to elastically deform along a preset stretching direction when the hot bed body expands due to heating, so as to avoid the hot bed body from deforming towards a direction perpendicular to the preset stretching direction when heated. The preset stretching direction is a length direction and / or a width direction of the hot bed body.

[0007] In some embodiments, the length direction of the hot bed body is an X direction, the width direction of the hot bed body is a Y direction, and the X direction and the Y direction are adjustable. The flexible connecting mechanisms comprise X-direction flexible connecting members and / or Y-direction flexible connecting members. The X-direction flexible connecting members are capable of elastically stretching or retracting along the X direction. The Y-direction flexible connecting members are capable of elastically stretching or retracting along the Y direction.

[0008] In some embodiments, the plurality of flexible connecting mechanisms comprise at least one first flexible connecting mechanism, at least one second flexible connecting mechanism, and at least one third flexible connecting mechanism. The first flexible connecting mechanism and the third flexible connecting mechanism are symmetrically arranged on the hot bed body along the X direction. The first flexible connecting mechanism comprises a first X-direction flexible connecting member. The second flexible connecting mechanism and the third flexible connecting mechanism are symmetrically arranged on the hot bed body along the Y direction. The second flexible connecting mechanism comprises a first Y-direction flexible connecting member. The third flexible connecting mechanism comprises a second X-direction flexible connecting member and a second Y-direction flexible connecting member.

[0009] In some embodiments, the connecting members comprise at least one first mounting hole arranged on the hot bed body. The first mounting hole and the first flexible connecting mechanism are symmetrically arranged along the Y direction. The first mounting hole and the second flexible connecting mechanism are symmetrically arranged along the X direction.

[0010] In some embodiments, the hot bed body is provided with a first assembly hole, a second assembly hole, and a third assembly hole. The first X-direction flexible connecting member is arranged in the first assembly hole, and one end of the first X-direction flexible connecting member is connected with an inner wall of the first assembly hole. The first Y-direction flexible connecting member is arranged in the second assembly hole, and one end of the first Y-direction flexible connecting member is connected with an inner wall of the second assembly hole. The second X-direction flexible connecting member and the second Y-direction flexible connecting member are both arranged in the third assembly hole, and one end of the second X-direction flexible connecting member and one end of the second Y-direction flexible connecting member are respectively connected with an inner wall of the third assembly hole.

[0011] In some embodiments, the connecting piece further comprises a second mounting hole, a third mounting hole and a fourth mounting hole, which are arranged in the first assembly hole, the second assembly hole and the third assembly hole.

[0012] In some embodiments, the hot bed body is provided with a first notch, a second notch and a third notch near each corner position respectively; the 3D printer hot bed further comprises a first extension plate, a second extension plate and a third extension plate; the first flexible connecting mechanism further comprises a first supporting flexible connecting piece, and the second flexible connecting mechanism further comprises a second supporting flexible connecting piece; two ends of the first extension plate are connected to two ends of the first notch integrally through the first X-direction flexible connecting piece and the first supporting flexible connecting piece, and a space for the first X-direction flexible connecting piece and the first supporting flexible connecting piece to elastically deform is formed between the first extension plate and the first notch; two ends of the second extension plate are connected to two ends of the second notch integrally through the first Y-direction flexible connecting piece and the second supporting flexible connecting piece, and a space for the first Y-direction flexible connecting piece and the second supporting flexible connecting piece to elastically deform is formed between the second extension plate and the second notch; two ends of the third extension plate are connected to two ends of the third notch integrally through the second X-direction flexible connecting piece and the second Y-direction flexible connecting piece, and a space for the second X-direction flexible connecting piece and the second Y-direction flexible connecting piece to elastically deform is formed between the third extension plate and the third notch.

[0013] In some embodiments, the connecting piece further comprises a fifth mounting hole, a sixth mounting hole and a seventh mounting hole; the fifth mounting hole, the sixth mounting hole and the seventh mounting hole are arranged in the first extension plate, the second extension plate and the third extension plate respectively.

[0014] In some embodiments, the X-direction flexible connecting piece and the Y-direction flexible connecting piece are thin-walled structures, and the thickness of the thin-walled structure in the horizontal direction of the hot bed body is less than the height of the thin-walled structure in the vertical direction of the hot bed body.

[0015] The application further provides a 3D printer comprising the above-mentioned 3D printer hot bed.

[0016] Compared with the prior art, the 3D printer hot bed and the 3D printer provided by the application have the following beneficial effects:

[0017] 1. The 3D printer hot bed provided by the present application is provided with a plurality of flexible connecting mechanisms on the hot bed body, when the hot bed body expands due to temperature rise, the flexible connecting mechanisms elastically deform along the length direction and / or width direction of the hot bed body, the hot bed body can expand along the length direction and / or width direction, thereby eliminating the expansion deformation of the hot bed body in the vertical direction, and avoiding the occurrence of printing defects or printing failure caused by thermal deformation.

[0018] 2. Compared with the existing 3D printing thermal deformation compensation device, the present application only improves the body of the 3D printer hot bed, eliminates thermal deformation, ensures printing precision, improves printing success rate and printing efficiency, and has a simple structure and can adapt to more types of 3D printers. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above-mentioned characteristics, technical features, advantages and implementation modes of the present application will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0020] Figure 1 The structure schematic view of the hot bed body provided for the embodiment 1 of the present application is shown in the figure.

[0021] Figure 2 Another structure schematic view of the hot bed body provided for the embodiment 1 of the present application is shown in the figure.

[0022] Figure 3 The structure schematic view of the first flexible connecting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0023] Figure 4 The structure schematic view of the second flexible connecting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0024] Figure 5 The structure schematic view of the third flexible connecting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0025] Figure 6 The structure schematic view of the hot bed body provided for the embodiment 2 of the present application is shown in the figure.

[0026] Figure 7 The structure schematic view of the first flexible connecting mechanism provided for the embodiment 2 of the present application is shown in the figure.

[0027] Figure 8 The structure schematic view of the second flexible connecting mechanism provided for the embodiment 2 of the present application is shown in the figure.

[0028] Figure 9 The structure schematic view of the third flexible connecting mechanism provided for the embodiment 2 of the present application is shown in the figure.

[0029] Explanation of reference numerals:

[0030] 1 - hot bed body; 2 - first X-direction flexible connecting piece; 3 - second X-direction flexible connecting piece; 4 - first Y-direction flexible connecting piece; 5 - second Y-direction flexible connecting piece; 6 - first mounting hole; 7 - second mounting hole; 8 - third mounting hole; 9 - fourth mounting hole; 10 - fifth mounting hole; 11 - sixth mounting hole; 12 - seventh mounting hole; 13 - first extension plate; 14 - second extension plate; 15 - third extension plate; 16 - first support flexible connecting piece; 17 - second support flexible connecting piece. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0032] In order to make the drawing simple, only the parts related to the invention are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0033] It should be further understood that the term "and / or" used in the specification and claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0034] In this paper, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0036] Example 1

[0037] As Figures 1 to 5 shown, the present application provides a 3D printer hot bed, which comprises a hot bed body 1, a plurality of connecting pieces and a plurality of flexible connecting mechanisms.

[0038] The heat bed body 1 is mounted on the 3D printer through the connecting piece, and the flexible connecting mechanism is flexibly connected with the heat bed body 1. When the heat bed body 1 is heated and expands, the flexible connecting mechanism is configured to be elastically deformed along a preset stretching direction, which is the length direction of the heat bed body, or the width direction, or the length direction and the width direction, so that the heat bed body 1 is extended along the preset stretching direction to avoid deformation of the heat bed body 1 in the direction perpendicular to the preset stretching direction when heated. When the temperature of the heat bed body 1 decreases, the heat bed body 1 resets, and the elasticity of the flexible connecting mechanism restores it to its original state.

[0039] In some embodiments, as shown in Figure 1 and Figure 2 The length direction of the heat bed body 1 is the X direction, and the width direction of the heat bed body 1 is the Y direction, and the X direction and the Y direction are adjustable.

[0040] The above-mentioned flexible connecting mechanism includes X-direction flexible connection, or Y-direction flexible connection, or X-direction flexible connection and Y-direction flexible connection.

[0041] The X-direction flexible connection can be elastically stretched or retracted along the X direction, and is arranged at a certain angle with the X direction, and the Y-direction flexible connection can be elastically stretched or retracted along the Y direction, and is arranged at a certain angle with the Y direction.

[0042] Preferably, the X-direction flexible connection is arranged perpendicular to the X direction, and the Y-direction flexible connection is arranged perpendicular to the Y direction.

[0043] Preferably, the X-direction flexible connection and the Y-direction flexible connection can be flexible hinges, the flexible hinges are thin-walled structures, and the thickness of the X-direction flexible connection and the Y-direction flexible connection in the horizontal direction of the heat bed body 1 (i.e. the X direction and / or the Y direction) is less than the height in the vertical direction of the heat bed body 1, so as to realize elastic deformation such as stretching and bending in the X direction / Y direction.

[0044] In some embodiments, as shown in Figure 2 The plurality of flexible connecting mechanisms include at least one first flexible connecting mechanism, at least one second flexible connecting mechanism, and at least one third flexible connecting mechanism.

[0045] The first flexible connecting mechanism and the third flexible connecting mechanism are symmetrically arranged on the heat bed body 1 along the X direction, and the second flexible connecting mechanism and the third flexible connecting mechanism are symmetrically arranged on the heat bed body 1 along the Y direction.

[0046] As shown in Figure 3As shown, the first flexible connecting mechanism comprises a first X-direction flexible connecting piece 2, which is arranged perpendicularly to the X-direction and can be elastically stretched along the X-direction, so that the heat bed body 1 can expand and extend along the X-direction.

[0047] As shown, the second flexible connecting mechanism comprises a first Y-direction flexible connecting piece 4, which is arranged perpendicularly to the Y-direction and can be elastically stretched along the Y-direction, so that the heat bed body 1 can expand and extend along the Y-direction. Figure 4

[0048] As shown, the third flexible connecting mechanism comprises a second X-direction flexible connecting piece 3 and a second Y-direction flexible connecting piece 5, the second X-direction flexible connecting piece 3 is arranged perpendicularly to the X-direction, and the second Y-direction flexible connecting piece 5 is arranged perpendicularly to the Y-direction, the second X-direction flexible connecting piece 3 has the same effect as the first X-direction flexible connecting piece 2, which can make the heat bed body 1 expand and extend along the X-direction when heated, and the second Y-direction flexible connecting piece 5 has the same effect as the first Y-direction flexible connecting piece 4, so that the heat bed body 1 can expand and extend along the X-direction and the Y-direction, thereby avoiding the heat bed body 1 from expanding in the perpendicular directions of the X-direction and the Y-direction. Figure 5

[0049] Further, the above-mentioned connecting piece comprises at least one first mounting hole 6, which is arranged on the heat bed body 6 and is a positioning round hole, mainly providing a positioning reference for the installation of the heat bed body 1, providing an accurate position for the inserted fasteners (such as bolts, pins, etc.) during the assembly with the 3D printer, and ensuring correct alignment.

[0050] As shown, the first mounting hole 6 and the first flexible connecting mechanism are symmetrically arranged along the Y-direction, that is, the first mounting hole 6 and the first X-direction flexible connecting piece 2 are symmetrically arranged along the Y-direction, and the first mounting hole 6 and the second flexible connecting mechanism are symmetrically arranged along the X-direction, that is, the first mounting hole 6 and the first Y-direction flexible connecting piece 4 are symmetrically arranged along the X-direction. Figure 2 The shape of the heat bed body 1 shown is rectangular, and the first mounting hole 6, the first flexible connecting mechanism, the second flexible connecting mechanism, and the third flexible connecting mechanism are arranged at the four corners of the rectangular heat bed body 1, respectively. Figure 2 Further, as shown,

[0051] Figures 2-5 ​​​As shown, the hot bed body 1 is provided with at least one first assembly hole, at least one second assembly hole and at least one third assembly hole, the first X-direction flexible connecting piece 2 is arranged in the first assembly hole, and one end of the first X-direction flexible connecting piece 2 is connected with the inner wall of the first assembly hole, the first Y-direction flexible connecting piece 4 is arranged in the second assembly hole, and one end of the first Y-direction flexible connecting piece 4 is connected with the inner wall of the second assembly hole, and the second X-direction flexible connecting piece 3 and the second Y-direction flexible connecting piece 5 are arranged in the third assembly hole, and one end of the second X-direction flexible connecting piece and one end of the second Y-direction flexible connecting piece are respectively connected with the inner wall of the third assembly hole.

[0052] Further, the plurality of connecting pieces further comprise: at least one second mounting hole 7, at least one third mounting hole 8 and at least one fourth mounting hole 9, the second mounting hole 7, the third mounting hole 8 and the fourth mounting hole 9 are arranged in the first assembly hole, the second assembly hole and the third assembly hole, the second mounting hole 7, the third mounting hole 8 and the fourth mounting hole 9 are screw through holes, the inner wall is provided with threads, and the hot bed body 1 can be fixed on the 3D printer by screwing the corresponding screws.

[0053] It should be noted that the connecting piece provided by the application is not limited to the form of the mounting hole and the screw, and the connecting piece can also be a common detachable connection form such as a buckle.

[0054] When the hot bed is heated, expansion will occur in the X direction, the Y direction and the vertical direction of the X direction and the Y direction, but the existing hot bed is fixed on the 3D printer through screws around the hot bed, when the hot bed is heated, since the four sides of the hot bed are fixed, the hot bed cannot expand and extend in the X direction or the Y direction, but can only expand in the vertical direction of the X direction and the Y direction, which leads to the change of the distance between the nozzle and the hot bed, and easily causes the printing piece to have layer misalignment and other problems, thereby affecting the printing quality. The flexible connecting mechanism (X-direction flexible connecting piece and Y-direction flexible connecting piece) provided by the application can elastically deform in the X direction and the Y direction, so as to provide expansion space for the hot bed body 1 in the X direction and the Y direction, and the hot bed body 1 can expand and extend in the X direction and the Y direction when heated, so that the hot bed body 1 will not expand in the vertical direction of the X direction and the Y direction, thereby avoiding the influence of the thermal deformation of the hot bed body 1 in the vertical direction of the X direction and the Y direction on the printing effect.

[0055] Specifically, the first X-direction flexible connecting member 2 can be elastically stretched along the X direction, the first Y-direction flexible connecting member 4 can be elastically stretched along the Y direction, the second X-direction flexible connecting member 3 and the second Y-direction flexible connecting member 5 can be elastically stretched along the X direction and the Y direction respectively, and the heat bed body 1 can be expanded and extended along the X direction and the Y direction respectively when heated, so as to avoid thermal deformation of the heat bed body 1 in the vertical direction perpendicular to the X direction and the Y direction, the X-direction flexible connecting member and the Y-direction flexible connecting member can release the thermal stress generated when the heat bed body 1 is heated along the X direction and the Y direction, avoid thermal deformation of the heat bed body 1 in the vertical direction, eliminate the occurrence of printing defects caused by thermal deformation in the vertical direction, and restore the original state of the first X-direction flexible connecting member 2, the first Y-direction flexible connecting member 4, the second X-direction flexible connecting member 3 and the second Y-direction flexible connecting member 5 when the heat bed body 1 is cooled.

[0056] More specifically:

[0057] When the temperature of the heat bed body 1 rises and causes thermal expansion of the heat bed body 1 in the X direction, the first X-direction flexible connecting member 2 at the second mounting hole 7 and the second X-direction flexible connecting member 3 at the fourth mounting hole 9 are both elastically stretched along the X direction, at this time the second Y-direction flexible connecting member 5 is bent along the Y direction, and the heat bed body 1 is expanded and extended along the X direction, so that the heat bed body 1 will not be thermally deformed in the vertical direction.

[0058] Because the first Y-direction flexible connecting member 4 and the first mounting hole 6 are symmetrically arranged along the X direction, the first Y-direction flexible connecting member 4 and the first mounting hole 6 are in the same Y direction, so that the deformation of the first Y-direction flexible connecting member 4 in the X direction is not analyzed when the heat bed body 1 is thermally expanded in the X direction.

[0059] When the temperature of the heat bed body 1 rises and causes thermal expansion of the heat bed body 1 in the Y direction, the first Y-direction flexible connecting member 4 at the third mounting hole 8 and the second Y-direction flexible connecting member 5 at the fourth mounting hole 9 are both elastically stretched along the Y direction, at this time the second X-direction flexible connecting member 3 is bent along the X direction, and the heat bed body 1 is expanded and extended along the Y direction, so that the heat bed body 1 will not be thermally deformed in the vertical direction.

[0060] Because the first X-direction flexible connecting member 2 and the first mounting hole 6 are symmetrically arranged along the Y direction, the first X-direction flexible connecting member 2 and the first mounting hole 6 are in the same X-direction coordinate axis, so that the deformation of the first X-direction flexible connecting member 2 in the Y direction is not analyzed when the heat bed body 1 is thermally expanded in the Y direction.

[0061] Embodiment 2

[0062] On the basis of embodiment 1, the present application provides another structure of the flexible connecting mechanism, such as Figures 6-9As shown: The heated bed body 1 is provided with a first notch, a second notch and a third notch near each corner. The heated bed of the 3D printer also includes a first extension plate 13, a second extension plate 14 and a third extension plate 15.

[0063] The first flexible connection mechanism mentioned above also includes a first supporting flexible connector 16, and the second flexible connection mechanism also includes a second supporting flexible connector 17. The first supporting flexible connector 16 and the second supporting flexible connector 17 can be bent along the Y direction and the X direction, respectively.

[0064] like Figure 7 As shown, the two ends of the first extension plate 13 are connected to the two ends of the first notch by the first X-direction flexible connector 2 and the first support flexible connector 16 respectively, and a space is formed between the first extension plate 16 and the first notch for the first X-direction flexible connector 2 and the first support flexible connector 16 to undergo elastic deformation.

[0065] like Figure 8 As shown, the two ends of the second extension plate 14 are connected to the two ends of the second notch by the first Y-direction flexible connector 4 and the second support flexible connector 17 respectively, and a space is formed between the second extension plate 14 and the second notch for the first Y-direction flexible connector 4 and the second support flexible connector 17 to undergo elastic deformation.

[0066] like Figure 9 As shown, the two ends of the third extension plate 15 are connected to the two ends of the third notch by the second X-direction flexible connector 3 and the second Y-direction flexible connector 5 respectively, and a space is formed between the third extension plate 15 and the third notch for the second X-direction flexible connector 3 and the second Y-direction flexible connector 5 to undergo elastic deformation.

[0067] In this embodiment, several connecting parts further include: a fifth mounting hole 10, a sixth mounting hole 11 and a seventh mounting hole 12. The fifth mounting hole 10, the sixth mounting hole 11 and the seventh mounting hole 12 are respectively provided on the first extension plate 13, the second extension plate 14 and the third extension plate 15. Their function is the same as that of the second mounting hole 7, the third mounting hole 8 and the fourth mounting hole 9 in embodiment 1, which fix the heated bed body 1 on the 3D printer.

[0068] Specifically:

[0069] When the temperature of the hot bed body 1 rises and causes thermal expansion of the hot bed body 1 in the X direction, the first X-direction flexible connecting piece 2 at the fifth mounting hole 10 elastically stretches in the X direction, and the first support flexible connecting piece 16 bends in the Y direction, while the second X-direction flexible connecting piece 3 at the seventh mounting hole 12 also elastically stretches in the X direction, and the second Y-direction flexible connecting piece 5 bends in the Y direction, the hot bed body expands and extends in the X direction, and the thermal stress generated by the hot bed body 1 is released at the first flexible connecting mechanism (the first X-direction flexible connecting piece 2 and the first support flexible connecting piece 16) and the third flexible connecting mechanism (the second X-direction flexible connecting piece 3 and the second Y-direction flexible connecting piece 5), so that the hot bed body 1 does not produce thermal deformation in the vertical direction.

[0070] The second flexible connecting mechanism composed of the first Y-direction flexible connecting piece 4 and the second support flexible connecting piece 17 is symmetrically arranged with the first mounting hole 6 in the X direction, and the second flexible connecting mechanism is in the same X direction as the first mounting hole 6, so that when the hot bed body 1 produces thermal expansion in the X direction, the deformation of the first Y-direction flexible connecting piece 4 and the second support flexible connecting piece 17 in the X direction at the sixth mounting hole 11 does not need to be analyzed.

[0071] When the temperature of the hot bed body 1 rises and causes thermal expansion of the hot bed body 1 in the Y direction, the first Y-direction flexible connecting piece 4 at the sixth mounting hole 11 elastically stretches in the Y direction, and the second support flexible connecting piece 17 bends in the X direction, while the second Y-direction flexible connecting piece 5 at the seventh mounting hole 12 also elastically stretches in the Y direction, and the second X-direction flexible connecting piece 3 bends in the X direction, the hot bed body expands and extends in the Y direction, and the thermal stress generated by the hot bed body 1 is released at the second flexible connecting mechanism (the first Y-direction flexible connecting piece 4 and the second support flexible connecting piece 17) and the third flexible connecting mechanism (the second X-direction flexible connecting piece 3 and the second Y-direction flexible connecting piece 5), so that the hot bed body 1 does not produce thermal deformation in the vertical direction.

[0072] The first flexible connecting mechanism composed of the first X-direction flexible connecting piece 2 and the first support flexible connecting piece 16 is symmetrically arranged with the first mounting hole 6 in the Y direction, and the first flexible connecting mechanism is in the same Y direction as the first mounting hole 6, so that when the hot bed body 1 produces thermal expansion in the Y direction, the deformation of the first X-direction flexible connecting piece 2 and the first support flexible connecting piece 16 in the Y direction does not need to be analyzed.

[0073] Example 3

[0074] On the basis of the embodiments 1 and 2, the application further provides a 3D printer, comprising the 3D printer hot bed described in the embodiments 1 and 2, a plurality of flexible connecting mechanisms are arranged on the hot bed body, the flexible connecting mechanisms can elastically deform along the X direction and / or the Y direction, so that the hot bed body 1 can expand and extend along the X direction and / or the Y direction under the heat, the thermal stress generated when the hot bed body 1 is heated is released along the X direction and the Y direction, the thermal deformation of the hot bed body 1 in the direction perpendicular to the X direction and the Y direction (i.e. in the vertical direction) is eliminated, and the occurrence of printing defects caused by the thermal deformation in the vertical direction is avoided.

[0075] The above is only the preferred embodiment of the application, and it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the application.

Claims

1. A heated bed for a 3D printer, characterized in that, include: The heated bed body, several connecting parts, and several flexible connection mechanisms; The heated bed body is mounted on the 3D printer via the connector; Both ends of the flexible connection mechanism are flexibly connected to the heated bed body. One end of the flexible connection mechanism is flexibly connected to the heated bed body where the connector is located. The flexible connection mechanism is configured to elastically deform along a preset stretching direction when the heated bed body expands due to heat, so as to avoid deformation of the heated bed body in a direction perpendicular to the preset stretching direction when heated. The preset stretching direction is the length direction and / or width direction of the heated bed body.

2. The 3D printer heated bed according to claim 1, characterized in that, The length direction of the heated bed body is the X direction, the width direction of the heated bed body is the Y direction, and the X direction and the Y direction are adjustable; The flexible connection mechanism includes an X-axis flexible connector and / or a Y-axis flexible connector. The X-direction flexible connector can elastically stretch or retract along the X direction; The Y-direction flexible connector can elastically stretch or retract along the Y direction.

3. The heated bed for a 3D printer according to claim 2, characterized in that, The plurality of the flexible connection mechanisms include: at least one first flexible connection mechanism, at least one second flexible connection mechanism and at least one third flexible connection mechanism; The first flexible connection mechanism and the third flexible connection mechanism are symmetrically arranged on the heated bed body along the X direction. The first flexible connection mechanism includes a first X-direction flexible connector. The second flexible connection mechanism and the third flexible connection mechanism are symmetrically arranged on the heated bed body along the Y direction. The second flexible connection mechanism includes a first Y-direction flexible connector. The third flexible connection mechanism includes a second X-axis flexible connector and a second Y-axis flexible connector.

4. The heated bed for a 3D printer according to claim 3, characterized in that, The connector includes at least one first mounting hole, which is disposed on the heated bed body; The first mounting hole and the first flexible connection mechanism are symmetrically arranged along the Y direction; The first mounting hole and the second flexible connection mechanism are symmetrically arranged along the X direction.

5. The heated bed for a 3D printer according to claim 3 or 4, characterized in that, The heated bed body is provided with a first assembly hole, a second assembly hole and a third assembly hole; The first X-direction flexible connector is disposed in the first assembly hole, and one end of the first X-direction flexible connector is connected to the inner wall of the first assembly hole. The first Y-direction flexible connector is disposed in the second assembly hole, and one end of the first Y-direction flexible connector is connected to the inner wall of the second assembly hole; The second X-direction flexible connector and the second Y-direction flexible connector are both disposed in the third assembly hole, and one end of the second X-direction flexible connector and one end of the second Y-direction flexible connector are respectively connected to the inner wall of the third assembly hole.

6. The heated bed for a 3D printer according to claim 5, characterized in that, The connector further includes: a second mounting hole, a third mounting hole, and a fourth mounting hole. The second mounting hole, the third mounting hole, and the fourth mounting hole are respectively disposed in the first assembly hole, the second assembly hole, and the third assembly hole.

7. The heated bed for a 3D printer according to claim 3 or 4, characterized in that, The heated bed body is provided with a first notch, a second notch and a third notch near each corner; The 3D printer heated bed also includes: a first extension plate, a second extension plate, and a third extension plate; The first flexible connection mechanism further includes a first supporting flexible connector, and the second flexible connection mechanism further includes a second supporting flexible connector; The two ends of the first extension plate are connected to the two ends of the first notch by the first X-direction flexible connector and the first support flexible connector, respectively, and a space is formed between the first extension plate and the first notch for the first X-direction flexible connector and the first support flexible connector to undergo elastic deformation. The two ends of the second extension plate are connected to the two ends of the second notch by the first Y-direction flexible connector and the second support flexible connector, respectively, and a space is formed between the second extension plate and the second notch for the first Y-direction flexible connector and the second support flexible connector to undergo elastic deformation. The two ends of the third extension plate are connected to the two ends of the third notch by the second X-direction flexible connector and the second Y-direction flexible connector, respectively, and a space is formed between the third extension plate and the third notch for the second X-direction flexible connector and the second Y-direction flexible connector to undergo elastic deformation.

8. The heated bed for a 3D printer according to claim 7, characterized in that, The connector further includes: a fifth mounting hole, a sixth mounting hole, and a seventh mounting hole; The fifth mounting hole, the sixth mounting hole, and the seventh mounting hole are respectively provided on the first extension plate, the second extension plate, and the third extension plate.

9. The heated bed for a 3D printer according to any one of claims 2-4, characterized in that, Both the X-axis flexible connector and the Y-axis flexible connector are thin-walled structures, and the thickness of the thin-walled structure in the horizontal direction of the heated bed body is less than its height in the vertical direction of the heated bed body.

10. A 3D printer, characterized in that, Includes the heated bed for 3D printers as described in any one of claims 1-9.

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