3D printer hot bed and 3D printer

Abstract

According to the 3D printer hot bed and the 3D printer, a plurality of flexible connecting mechanisms are arranged on a hot bed body, each flexible connecting mechanism comprises an X-direction flexible connecting piece and / or a Y-direction flexible connecting piece, the X-direction flexible connecting pieces and the Y-direction flexible connecting pieces can elastically deform in the preset stretching direction, and the X-direction flexible connecting pieces and the Y-direction flexible connecting pieces can elastically deform in the preset stretching direction; the preset stretching direction is the length direction and the width direction of the hot bed body, the hot bed body can expand and extend in the length direction and / or the width direction, thermal deformation generated by the hot bed body in the direction perpendicular to the preset stretching direction is eliminated, and the problem of printing failure caused by thermal deformation is avoided.

Description

Technical Field

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

[0002] At present, when printing polyetheretherketone, polyetherketoneketone, polyphenylene sulfide and other high-performance materials, cavity preheating is usually used to reduce the temperature difference between the printing environment and the extruded material to reduce the warping of the printed parts. The traditional 3D printing hot bed is fixed to the Z-axis motion mechanism by screws, which will cause thermal deformation and assembly deformation, especially in large-scale 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 changes in the distance between the nozzle and the hot bed, which will cause printing failures and printing defects.

[0003] Among the existing products, most of them fix the hot bed to the Z-axis motion mechanism through 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, and the thermal deformation is large at high temperature, which brings printing problems. Patent CN112571797A discloses a hot bed made of carbon steel material. Compared with aluminum alloy, carbon steel has lower thermal expansion, so it has a certain effect, but it is limited to the scene where the temperature of the hot bed is not high and the size is small. For high temperature and large size, 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 dimensional changes caused by the thermal expansion of the hot bed by fixing the hot bed support assembly and coordinating the movement of the motion device, especially for large-sized aluminum alloy materials with high thermal expansion coefficient. This device has a complex structure, a large integration workload, and the gap in the motion device will cause the hot bed to have poor accuracy. Summary of the invention

[0004] In view of the problem of printing failure caused by thermal deformation of a 3D printing hot bed in the vertical direction in the prior art, the purpose of the present invention is to provide a 3D printer hot bed and a 3D printer, wherein a plurality of flexible connection mechanisms are arranged on the hot bed body, and when the temperature of the hot bed body increases and expands, the flexible connection mechanisms can elastically deform along the length direction and / or width direction of the hot bed body, and the hot bed body extends along its length direction and / or width direction after being heated, thereby 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 object, the present invention provides the following technical solutions:

[0006] A 3D printer heated bed, comprising: a heated bed body, a plurality of connecting pieces, and a plurality of flexible connecting mechanisms; the heated bed body is installed on the 3D printer through the connecting pieces; the flexible connecting mechanism is flexibly connected to the heated bed body, and the flexible connecting mechanism is configured to be able to elastically deform along a preset stretching direction when the heated bed body expands due to heat, so as to avoid the heated bed body from deforming 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.

[0007] In some embodiments, the length direction of the hot bed body is the X direction, the width direction of the hot bed body is the Y direction, and the X direction and the Y direction are adjustable; the flexible connection mechanism includes an X-direction flexible connector and / or a Y-direction flexible connector, and the X-direction flexible connector can be elastically stretched or retracted along the X direction; the Y-direction flexible connector can be elastically stretched or retracted along the Y direction.

[0008] In some embodiments, the plurality of 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 hot bed body along the X direction, and the first flexible connection mechanism includes a first X-direction flexible connection member; the second flexible connection mechanism and the third flexible connection mechanism are symmetrically arranged on the hot bed body along the Y direction, and the second flexible connection mechanism includes a first Y-direction flexible connection member; the third flexible connection mechanism includes a second X-direction flexible connection member and a second Y-direction flexible connection member.

[0009] In some embodiments, the connecting member includes at least one first mounting hole, and the first mounting hole is arranged on the hot 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.

[0010] In some embodiments, a first assembly hole, a second assembly hole and a third assembly hole are provided on the hot bed body; the first X-direction flexible connector is provided 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 provided 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 provided 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.

[0011] In some embodiments, the connecting member further includes: a second mounting hole, a third mounting hole and a fourth mounting hole, and the second mounting hole, the third mounting hole and the fourth mounting hole are respectively 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; the hot bed of the 3D printer further comprises: a first extension plate, a second extension plate and a third extension plate; the first flexible connection mechanism further comprises a first supporting flexible connector, and the second flexible connection mechanism further comprises a second supporting flexible connector; the two ends of the first extension plate are connected to the two ends of the first notch as a whole through the first X-direction flexible connector and the first supporting flexible connector, and a space for the first X-direction flexible connector and the first supporting flexible connector to undergo elastic deformation is formed between the first extension plate and the first notch; the two ends of the second extension plate are connected to the two ends of the second notch as a whole through the first Y-direction flexible connector and the second supporting flexible connector, and a space for the first Y-direction flexible connector and the second supporting flexible connector to undergo elastic deformation is formed between the second extension plate and the second notch; the two ends of the third extension plate are connected to the two ends of the third notch as a whole through the second X-direction flexible connector and the second Y-direction flexible connector, and a space for the second X-direction flexible connector and the second Y-direction flexible connector to undergo elastic deformation is formed between the third extension plate and the third notch.

[0013] In some embodiments, the connecting member 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 arranged on the first extension plate, the second extension plate, and the third extension plate.

[0014] In some embodiments, the X-direction flexible connector and the Y-direction flexible connector are both thin-walled structures, and the thickness of the thin-walled structure in the horizontal direction of the heated bed body is smaller than the height in the vertical direction of the heated bed body.

[0015] The present invention also provides a 3D printer, comprising the above-mentioned 3D printer hot bed.

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

[0017] 1. The 3D printer hot bed provided by the present invention is provided with a plurality of flexible connection mechanisms on the hot bed body. When the temperature of the hot bed body increases and causes the hot bed body to expand, the flexible connection mechanisms are elastically deformed along the length direction and / or width direction of the hot bed body, and 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 failures caused by thermal deformation;

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

[0019] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0020] Figure 1 A schematic diagram of the structure of a hot bed body provided in Example 1 of the present invention;

[0021] Figure 2 Another schematic diagram of the structure of the hot bed body provided in Example 1 of the present invention;

[0022] Figure 3 A schematic structural diagram of a first flexible connection mechanism provided in Example 1 of the present invention;

[0023] Figure 4 A schematic structural diagram of a second flexible connection mechanism provided in Example 1 of the present invention;

[0024] Figure 5 A schematic structural diagram of a third flexible connection mechanism provided in Example 1 of the present invention;

[0025] Figure 6 A schematic diagram of the structure of a hot bed body provided in Example 2 of the present invention;

[0026] Figure 7 A schematic structural diagram of a first flexible connection mechanism provided in Example 2 of the present invention;

[0027] Figure 8 A schematic structural diagram of a second flexible connection mechanism provided in Example 2 of the present invention;

[0028] Fig. 9 This is a schematic structural diagram of the third flexible connection mechanism provided in Example 2 of the present invention.

[0029] Description of Figure Numbers:

[0030] 1—heat bed body; 2—first X-direction flexible connector; 3—second X-direction flexible connector; 4—first Y-direction flexible connector; 5—second Y-direction flexible connector; 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 connector; 17—second support flexible connector. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0032] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "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 present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0034] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] Example 1

[0037] like Figures 1 to 5 As shown, the present invention provides a 3D printer hot bed, comprising: a hot bed body 1, a plurality of connecting parts and a plurality of flexible connecting mechanisms.

[0038] The hot bed body 1 is installed on the 3D printer through a connector, and the flexible connection mechanism is flexibly connected to the hot bed body 1. When the hot bed body 1 expands due to heat, the flexible connection mechanism is configured to be able to elastically deform along a preset stretching direction, which is the length direction, width direction, or length and width direction of the hot bed body, so that the hot bed body 1 expands and extends along the preset stretching direction to avoid deformation of the hot bed body 1 in a direction perpendicular to the preset stretching direction when heated. When the temperature of the hot bed body 1 decreases, the hot bed body 1 is reset, and the elasticity of the flexible connection mechanism restores it to its original state.

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

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

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

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

[0043] Preferably, the X-direction flexible connector and the Y-direction flexible connector can be flexible hinges, which are thin-walled structures, and the thickness of the X-direction flexible connector and the Y-direction flexible connector in the horizontal direction (i.e., the X direction and / or the Y direction) of the hot bed body 1 is smaller than the height in the vertical direction of the hot bed body 1, thereby achieving elastic deformation in the X direction / Y direction, such as stretching and bending.

[0044] In some embodiments, Figure 2 As shown, the plurality of 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.

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

[0046] like Figure 3As shown, the first flexible connection mechanism includes a first X-direction flexible connection member 2, which is arranged perpendicular to the X direction. The first X-direction flexible connection member 2 can be elastically stretched along the X direction, so that the hot bed body 1 can expand and extend along the X direction.

[0047] like Figure 4 As shown, the second flexible connection mechanism includes a first Y-direction flexible connection member 4, which is arranged perpendicular to the Y direction. The first Y-direction flexible connection member 4 can be elastically stretched along the Y direction, so that the hot bed body 1 can expand and extend along the Y direction.

[0048] like Figure 5 As shown, the third flexible connection mechanism includes a second X-direction flexible connection member 3 and a second Y-direction flexible connection member 5. The second X-direction flexible connection member 3 is arranged perpendicular to the X direction, and the second Y-direction flexible connection member 5 is arranged perpendicular to the Y direction. The second X-direction flexible connection member 3 has the same function as the first X-direction flexible connection member 2, and can make the hot bed body 1 expand and extend along the X direction when heated. Similarly, the second Y-direction flexible connection member 5 has the same function as the first Y-direction flexible connection member 4, and the hot bed body 1 can expand and extend along the X direction and the Y direction, thereby avoiding the hot bed body 1 from expanding in the direction perpendicular to the X direction and the Y direction.

[0049] Furthermore, the above-mentioned connecting member includes at least one first mounting hole 6, which is arranged on the hot bed body 6. The first mounting hole 6 is a positioning circular hole, which mainly provides a positioning reference for the installation of the hot bed body 1, and provides a precise position for the inserted fasteners (such as bolts, pins, etc.) during the assembly process with the 3D printer to ensure correct alignment.

[0050] like Figure 2 As shown, the first mounting hole 6 and the first flexible connection mechanism are symmetrically arranged along the Y direction, that is, the first mounting hole 6 and the first X-direction flexible connection member 2 are symmetrically arranged along the Y direction, and the first mounting hole 6 and the second flexible connection mechanism are symmetrically arranged along the X direction, that is, the first mounting hole 6 and the first Y-direction flexible connection member 4 are symmetrically arranged along the X direction. Figure 2 Taking the rectangular shape of the heated bed body 1 as an example, the first mounting hole 6 , the first flexible connection mechanism, the second flexible connection mechanism and the third flexible connection mechanism are respectively arranged at the four corners of the rectangular heated bed body 1 .

[0051] Further, such as Figure 2-5As shown, at least one first assembly hole, at least one second assembly hole and at least one third assembly hole are provided on the hot bed body 1, the first X-direction flexible connector 2 is provided in the first assembly hole, and one end of the first X-direction flexible connector 2 is connected to the inner wall of the first assembly hole, the first Y-direction flexible connector 4 is provided in the second assembly hole, and one end of the first Y-direction flexible connector 4 is connected to the inner wall of the second assembly hole, the second X-direction flexible connector 3 and the second Y-direction flexible connector 5 are both provided 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.

[0052] Furthermore, the plurality of connecting parts also include: 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 respectively 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, and the inner walls have threads, which can be threadedly matched with corresponding screws to fix the hot bed body 1 on the 3D printer.

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

[0054] When the hot bed is heated, it will expand in the X direction, Y direction, and perpendicular to the X direction and Y direction. However, the existing hot bed is fixed on the 3D printer by screws on all sides. When the hot bed is heated, since the hot bed is fixed on all sides, the hot bed cannot expand and extend in the X direction or Y direction, and can only expand in its vertical direction, that is, perpendicular to the X direction and Y direction, resulting in a change in the distance between the nozzle and the hot bed, which easily causes problems such as layer dislocation in the printed part, affecting the printing quality. The flexible connection mechanism (X-direction flexible connection member and Y-direction flexible connection member) provided in the present application can be elastically deformed in the X direction and Y direction, providing expansion space for the hot bed body 1 in the X direction and Y direction. When the hot bed body 1 is heated, it can expand and extend in the X direction and Y direction, and will not expand in the perpendicular X direction and Y direction, thereby avoiding the thermal deformation of the hot bed body 1 in the directions perpendicular to the X direction and Y direction affecting the printing effect.

[0055] Specifically, the first X-direction flexible connector 2 can be elastically stretched along the X direction, the first Y-direction flexible connector 4 can be elastically stretched along the Y direction, the second X-direction flexible connector 3 and the second Y-direction flexible connector 5 can be elastically stretched along the X direction and the Y direction respectively, and the hot bed body 1 expands and extends along the X direction and the Y direction respectively when heated, thereby avoiding thermal deformation of the hot bed body 1 perpendicular to the X direction and the Y direction (i.e., in the vertical direction). The X-direction flexible connector and the Y-direction flexible connector can release the thermal stress generated when the hot bed body 1 is heated along the X direction and the Y direction, avoiding thermal deformation of the hot bed body 1 in the vertical direction, and eliminating the occurrence of printing defects caused by thermal deformation in the vertical direction. In the process of the temperature of the hot bed body 1 dropping until it cools down, while the hot bed body 1 is reset, the first X-direction flexible connector 2, the first Y-direction flexible connector 4, the second X-direction flexible connector 3 and the second Y-direction flexible connector 5 can slowly return to their original state.

[0056] More specific:

[0057] When the temperature of the hot bed body 1 rises and causes thermal expansion in the X direction, the first X-direction flexible connector 2 at the second mounting hole 7 and the second X-direction flexible connector 3 at the fourth mounting hole 9 are elastically stretched along the X direction. At this time, the second Y-direction flexible connector 5 is bent along the Y direction, and the hot bed body 1 expands and extends along the X direction, so no thermal deformation will occur in the vertical direction.

[0058] Since the first Y-direction flexible connector 4 and the first mounting hole 6 are symmetrically arranged along the X direction, the first Y-direction flexible connector 4 and the first mounting hole 6 are in the same Y direction, there is no need to analyze the deformation of the first Y-direction flexible connector 4 in the X direction when the hot bed body 1 undergoes thermal expansion in the X direction.

[0059] When the temperature of the hot bed body 1 rises and causes thermal expansion in the Y direction, the first Y-direction flexible connector 4 at the third mounting hole 8 and the second Y-direction flexible connector 5 at the fourth mounting hole 9 are elastically stretched along the Y direction. At this time, the second X-direction flexible connector 3 is bent along the X direction, and the hot bed body 1 expands and extends along the Y direction. The hot bed body 1 will not be thermally deformed in the vertical direction.

[0060] Since the first X-direction flexible connector 2 and the first mounting hole 6 are symmetrically arranged along the Y direction, the first X-direction flexible connector 2 and the first mounting hole 6 are located in the same X-direction coordinate axis. Therefore, when the hot bed body 1 undergoes thermal expansion in the Y direction, there is no need to analyze the deformation of the first X-direction flexible connector 2 in the Y direction.

[0061] Example 2

[0062] Based on Example 1, the present invention provides another structure of a flexible connection mechanism, such as Figure 6-9As shown: a first notch, a second notch and a third notch are respectively provided near each corner position on the hot bed body 1, and the 3D printer hot bed also includes: a first extension plate 13, a second extension plate 14 and a third extension plate 15.

[0063] The first flexible connection mechanism further includes a first supporting flexible connection member 16, and the second flexible connection mechanism further includes a second supporting flexible connection member 17. The first supporting flexible connection member 16 and the second supporting flexible connection member 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 through the first X-direction flexible connector 2 and the first supporting 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 supporting 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 as a whole through the first Y-direction flexible connector 4 and the second supporting flexible connector 17, 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 supporting flexible connector 17 to undergo elastic deformation.

[0066] like Fig. 9 As shown, the two ends of the third extension plate 15 are connected to the two ends of the third notch as a whole through 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, the plurality of 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 arranged on the first extension plate 13, the second extension plate 14 and the third extension plate 15. Their functions are the same as those of the second mounting hole 7, the third mounting hole 8 and the fourth mounting hole 9 in Example 1, and the hot bed body 1 is fixed on the 3D printer.

[0068] Specific:

[0069] When the temperature of the hot bed body 1 rises and causes thermal expansion in the X direction, the first X-direction flexible connector 2 at the fifth mounting hole 10 is elastically stretched along the X direction, and the first supporting flexible connector 16 is bent along the Y direction, and the second X-direction flexible connector 3 at the seventh mounting hole 12 is also elastically stretched along the X direction, and the second Y-direction flexible connector 5 is bent along the Y direction, and the hot bed body expands and extends along the X direction. The thermal stress generated by the heat on the hot bed body 1 is released at the first flexible connection mechanism (the first X-direction flexible connector 2 and the first supporting flexible connector 16) and the third flexible connection mechanism (the second X-direction flexible connector 3 and the second Y-direction flexible connector 5), so that the hot bed body 1 will not be thermally deformed in the vertical direction.

[0070] Since the second flexible connection mechanism composed of the first Y-direction flexible connection member 4 and the second supporting flexible connection member 17 is symmetrically arranged with the first mounting hole 6 along the X direction, and the second flexible connection mechanism and the first mounting hole 6 are in the same X direction, when the hot bed body 1 undergoes thermal expansion in the X direction, there is no need to analyze the deformation of the first Y-direction flexible connection member 4 and the second supporting flexible connection member 17 at the sixth mounting hole 11 in the X direction.

[0071] When the temperature of the hot bed body 1 rises and causes thermal expansion in the Y direction, the first Y-direction flexible connector 4 at the sixth mounting hole 11 is elastically stretched along the Y direction, and the second supporting flexible connector 17 is bent along the X direction, and the second Y-direction flexible connector 5 at the seventh mounting hole 12 is also elastically stretched along the Y direction, the second X-direction flexible connector 3 is bent along the X direction, and the hot bed body expands and extends along the Y direction. The thermal stress generated by the heat on the hot bed body 1 is released at the second flexible connection mechanism (the first Y-direction flexible connector 4 and the second supporting flexible connector 17) and the third flexible connection mechanism (the second X-direction flexible connector 3 and the second Y-direction flexible connector 5), so that the hot bed body 1 will not be thermally deformed in the vertical direction.

[0072] Since the first flexible connection mechanism composed of the first X-direction flexible connection member 2 and the first supporting flexible connection member 16 and the first mounting hole 6 are symmetrically arranged along the Y direction, the first flexible connection mechanism and the first mounting hole 6 are in the same Y direction. Therefore, when the hot bed body 1 undergoes thermal expansion in the Y direction, there is no need to analyze the deformation of the first X-direction flexible connection member 2 and the first supporting flexible connection member 16 in the Y direction.

[0073] Example 3

[0074] On the basis of Example 1 and Example 2, the present invention further provides a 3D printer, comprising the 3D printer hot bed described in Example 1 and Example 2, wherein a plurality of flexible connection mechanisms are arranged on the hot bed body, and the flexible connection mechanisms can be elastically deformed 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 when heated, and the thermal stress generated when the hot bed body 1 is heated is released along the X direction and the Y direction, thereby eliminating the thermal deformation of the hot bed body 1 in the directions perpendicular to the X direction and the Y direction (i.e., in the vertical direction), and avoiding the occurrence of printing defects caused by thermal deformation in the vertical direction.

[0075] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A 3D printer hot bed, characterized in that: include: A hot bed body, a plurality of connecting parts, and a plurality of flexible connecting mechanisms; The hot bed body is installed on the 3D printer through the connecting piece; The flexible connection mechanism is flexibly connected to the hot bed body, and the flexible connection mechanism is configured to be able to elastically deform along a preset stretching direction when the hot bed body expands due to heat, so as to avoid deformation of the hot bed body in a direction perpendicular to the preset stretching direction when the hot bed body is heated; The preset stretching direction is the length direction and / or width direction of the hot bed body.

2. The 3D printer hot bed according to claim 1, characterized in that: The length direction of the hot bed body is the X direction, the width direction of the hot bed body is the Y direction, and the X direction and the Y direction are adjustable; The flexible connection mechanism includes an X-direction flexible connection member and / or a Y-direction flexible connection member, The X-direction flexible connection member can be elastically stretched or retracted along the X-direction; The Y-direction flexible connection member can be elastically stretched or retracted along the Y direction.

3. The 3D printer hot bed according to claim 2, characterized in that: The plurality of 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 hot bed body along the X direction, and the first flexible connection mechanism includes a first X-direction flexible connection member; The second flexible connection mechanism and the third flexible connection mechanism are symmetrically arranged on the hot bed body along the Y direction, and the second flexible connection mechanism includes a first Y-direction flexible connection member; The third flexible connection mechanism includes a second X-direction flexible connection member and a second Y-direction flexible connection member.

4. The 3D printer hot bed according to claim 3, characterized in that: The connecting member includes at least one first mounting hole, and the first mounting hole is arranged on the hot 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 3D printer hot bed according to claim 3 or 4, characterized in that: 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 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 3D printer hot bed according to claim 5, characterized in that: The connecting member further comprises: 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 arranged in the first assembly hole, the second assembly hole and the third assembly hole.

7. The 3D printer hot bed according to claim 3 or 4, characterized in that: The hot bed body is provided with a first notch, a second notch and a third notch near each corner. The 3D printer hot bed also includes: a first extension plate, a second extension plate and a third extension plate; The first flexible connection mechanism further comprises a first supporting flexible connection member, and the second flexible connection mechanism further comprises a second supporting flexible connection member; The two ends of the first extension plate are connected to the two ends of the first notch through the first X-direction flexible connector and the first supporting 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 supporting flexible connector to be elastically deformed; The two ends of the second extension plate are connected to the two ends of the second notch through the first Y-direction flexible connector and the second supporting flexible connector, respectively, and a space for the first Y-direction flexible connector and the second supporting flexible connector to be elastically deformed is formed between the second extension plate and the second notch; The two ends of the third extension plate are connected to the two ends of the third notch through 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 3D printer hot bed according to claim 7, characterized in that: The connecting member 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 respectively provided on the first extension plate, the second extension plate, and the third extension plate.

9. The 3D printer hot bed according to any one of claims 2-4, characterized in that: The X-direction flexible connector and the Y-direction flexible connector are both thin-walled structures, and the thickness of the thin-walled structure in the horizontal direction of the hot bed body is smaller than the height in the vertical direction of the hot bed body.

10. A 3D printer, characterized in that: A 3D printer hot bed comprising any one of claims 1-9.

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