Hot bed and 3D printer

Abstract

The utility model discloses a hot bed and a 3D printer. The hot bed comprises a bed plate and a heating device, the supporting piece is arranged on one side of the bed board; the elastic leveling device is connected with the bed board and the supporting piece and is used for adjusting the flatness of the bed board; the locking assembly is connected with the bed board and the supporting piece and used for locking the position of the bed board relative to the supporting piece after the bed board is leveled. According to the hot bed in the embodiment, the locking assembly is used for locking the position of the bed board relative to the supporting piece after the bed board is leveled, so that deformation and displacement of the bed board can be reduced, the overall rigidity of the hot bed is improved, and then the printing quality of the 3D printer is improved.

Description

TECHNICAL FIELD

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

[0002] 3D printing technology, also known as additive manufacturing technology, is a technology that uses a digital model file as a basis and uses a material that can be bonded to construct a printed part through layer-by-layer printing. In the process of 3D printing, the material that can be bonded in a molten state extruded by the print head of the 3D printer can contact the print panel, and the levelness of the print panel becomes one of the key factors for improving the printing quality. In the related art, after the print panel is leveled by the leveling device, the print panel may be deformed in the process of use due to the poor rigidity of the print panel, which may reduce the printing quality. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a hot bed and a 3D printer.

[0004] The hot bed of the present application is used for a 3D printer, and the hot bed comprises:

[0005] a bed plate;

[0006] a support member arranged on one side of the bed plate;

[0007] an elastic leveling device connected to the bed plate and the support member, used for adjusting the flatness of the bed plate; and

[0008] a locking assembly connected to the bed plate and the support member, used for locking the position of the bed plate relative to the support member after the bed plate is leveled.

[0009] In the hot bed of the above embodiment, the locking assembly is used for locking the position of the bed plate relative to the support member after the bed plate is leveled, so that the deformation and displacement of the bed plate can be reduced, the rigidity of the whole hot bed is improved, and the printing quality of the 3D printer is improved.

[0010] In some embodiments, the locking assembly comprises a limiting member and a locking member, the limiting member is arranged on the bed plate and abuts against the support member, the locking member is connected to the limiting member and the support member, and the limiting member and the locking member cooperate to limit the degree of freedom of the bed plate relative to the support member in a first direction, the first direction being the same as the thickness direction of the bed plate.

[0011] In some embodiments, the limiting member comprises a first sub-member, the first sub-member is provided with a first through hole, and the locking member is arranged in the first through hole along a second direction and inserted into the support member, the second direction being perpendicular to the first direction.

[0012] In some embodiments, the first sub-piece is in a shape of a sheet or a plate, a length direction of the first sub-piece extends along the first direction, and a tensile strength of the first sub-piece along the first direction is greater than a tensile strength of the first sub-piece along the second direction.

[0013] In some embodiments, the limiting piece includes a second sub-piece spaced apart from the first sub-piece, the second sub-piece includes a first limiting portion and a second limiting portion connected to the first limiting portion, the first limiting portion abuts against the support piece along the first direction, the second limiting portion is connected to the bed plate and abuts against or is spaced apart from the support piece along the second direction, the second sub-piece is in a shape of L or Z, and a rigidity of the second sub-piece along the first direction is weaker than a rigidity of the first sub-piece.

[0014] In some embodiments, the first limiting portion is provided with a second through hole, and the locking piece is arranged in the second through hole along the first direction and is inserted into the support piece.

[0015] In some embodiments, the number of the first sub-pieces is plural, the number of the second sub-pieces is one, the plural first sub-pieces and the second sub-piece are spaced apart along a circumferential direction of the bed plate, and at least part of the first sub-pieces are arranged at edge positions of the bed plate.

[0016] In some embodiments, the bed plate is in a shape of a rectangle, and the number of the first sub-pieces at the corresponding edge positions of the bed plate is equal.

[0017] In some embodiments, the support piece includes plural support segments, the plural support segments are sequentially connected in a head-to-tail manner and extend along a circumferential direction of the bed plate, and the plural support segments jointly form a closed loop structure with a continuous cross section together with the limiting piece and the bed plate.

[0018] In some embodiments, the support piece is in a shape of a mouth as a whole, along a cross section perpendicular to the bed plate, a cross section of the support segment is in a shape of U, and an opening of the cross section of the support segment in the shape of U is arranged towards the bed plate.

[0019] In some embodiments, the heated bed includes a heating piece and a heat preservation piece, the heating piece is at least partially arranged in the heat preservation piece and is in a heat conduction connection with the bed plate, and the heat preservation piece wraps the heating piece and part of the bed plate.

[0020] In some embodiments, the elastic leveling device comprises an elastic member and an adjusting member, the elastic member is arranged between the bed board and the support member, the adjusting member connects the bed board and the support member, the support member is provided with a screw hole, one end of the adjusting member is provided with a screw thread, the adjusting member is arranged in the bed board, and the one end of the adjusting member is screwed in the screw hole, so as to adjust the position between the bed board and the support member, and to level the bed board.

[0021] The 3D printer of the embodiments of the present application comprises the heat bed of any one of the above embodiments.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0024] Figure 1 is a perspective view of a heat bed of the embodiments of the present application;

[0025] Figure 2 is another perspective view of the heat bed of the embodiments of the present application from another angle;

[0026] Figure 3 is another perspective view of the heat bed of the embodiments of the present application from another angle;

[0027] Figure 4 is an exploded view of the heat bed of the embodiments of the present application;

[0028] Figure 5 is a partial view of the heat bed of the embodiments of the present application; Figure 3

[0029] Figure 6 is a partial perspective view of the heat bed of the embodiments of the present application;

[0030] Figure 7 is a perspective view of a support member of the embodiments of the present application;

[0031] Figure 8 is a plan view of the heat bed of the embodiments of the present application;

[0032] Figure 9 is a cross-sectional view of the heat bed of the embodiments of the present application along direction I-I; Figure 8

[0033] is another plan view of the heat bed of the embodiments of the present application; Figure 10

[0034] is another plan view of the heat bed of the embodiments of the present application;​Figure 11 is a schematic view of a cross section of the hot bed along the direction II-II; Figure 10

[0035] Figure 12 is an enlarged schematic view of a III part of the hot bed; Figure 11

[0036] Figure 13 is a schematic view of a perspective view of the bed plate and the heating element combined according to an embodiment of the present application;

[0037] Figure 14 is a schematic view of a plan view of the bed plate and the heating element combined according to an embodiment of the present application;

[0038] Figure 15 is a schematic view of a plan view of the heating element according to an embodiment of the present application;

[0039] Figure 16 is a schematic view of another plan view of the heating element according to an embodiment of the present application;

[0040] Figure 17 is a schematic view of a thermal simulation cloud of the bed plate according to an embodiment of the present application;

[0041] Figure 18 is a schematic view of a thermal simulation cloud of the bed plate according to the related art.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 100-hot bed, 10-bed plate, 11-plate body, 12-first heat-conducting rib, 13-limiting rib, 131-receiving groove, 14-heat-conducting body, 15-second heat-conducting rib, 20-supporting element, 21-supporting section, 22-closed loop structure, 23-screw hole, 30-elastic leveling device, 31-elastic element, 32-adjusting element, 40-locking assembly, 41-limiting element, 411-first sub-element, 4111-first through hole, 412-second sub-element, 4121-first limiting part, 4122-second limiting part, 4123-second through hole, 42-locking element, 101-printing panel, 102-flexible layer, 50-heating element, 501-first power connection end, 502-second power connection end, 51-first heating section, 52-second heating section, 53-third heating section, 54-fourth heating section, 55-fifth heating section, 56-sixth heating section, 57-seventh heating section, 58-eighth heating section, 59-ninth heating section, 591-first arc section, 592-second arc section, 593-third arc section, 60-heat preservation element, W-first direction, Y-second direction, Z1-first planar direction, Z2-second planar direction. DETAILED DESCRIPTION

[0044] ​​Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals, and thus repeated description is omitted. The embodiments described below are examples for explaining the present application, and are not intended to limit the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship shown in the drawings, and are merely used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0046] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between 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.

[0047] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0049] Please refer to Figures 1-4 The hot bed 100 of the embodiments of the present application is used in a 3D printer, or in other words, the 3D printer comprises the hot bed 100. The hot bed 100 comprises a bed plate 10, a support 20, an elastic leveling device 30, and a locking assembly 40, the support 20 is arranged on one side of the bed plate 10; the elastic leveling device 30 connects the bed plate 10 and the support 20, and is used to adjust the flatness of the bed plate 10; the locking assembly 40 connects the bed plate 10 and the support 20, and is used to lock the position of the bed plate 10 relative to the support 20 after the bed plate 10 is leveled.

[0050] In the hot bed 100 of the above-mentioned embodiments, the locking assembly 40 is used to lock the position of the bed plate 10 relative to the support 20 after the bed plate 10 is leveled, which can reduce the deformation and displacement of the bed plate 10, improve the rigidity of the whole hot bed 100, and reduce the deformation amount of the hot bed 100 when a large-size hot bed 100 is applied, thereby improving the printing quality of the 3D printer.

[0051] Specifically, the bed plate 10 is mainly used to carry the printing material, for example, as shown in Figure 4 The hot bed 100 can further comprise a printing panel 101 and a flexible layer 102, and the flexible layer 102 is arranged between the printing panel 101 and the bed plate 10. The flexible layer 102 is, for example, a soft magnetic sticker, which can adsorb the printing panel 101 on the bed plate 10. During the printing process, the bed plate 10 can transfer heat to the printing panel 101 through the flexible layer 102, thereby heating the printing material on the printing panel 101.

[0052] In an embodiment, the adsorption of the printing panel 101 can also be achieved by embedding a magnet or a magnetic material in the bed plate 10, so that the flexible layer 102 can be omitted, which is not limited in the present application.

[0053] The overall profile of the bed plate 10 can be square, for example, the overall profile of the bed plate 10 can be rectangular or square. The bed plate 10 can be made of a heat-conducting material such as metal, for example, the material of the bed plate 10 can be aluminum alloy. The bed plate 10 can be a solid plate, or a die casting, a stamping or an extrusion, etc.

[0054] The support 20 is used to support and reinforce the bed plate 10, and reduce the deformation of the bed plate 10 to affect the printing quality. The support 20 can be made of a material with high rigidity, for example, the material of the support 20 can be galvanized sheet, stainless steel, aluminum alloy, etc.

[0055] The elastic leveling device 30 adjusts the flatness of the bed plate 10, so that the bed plate 10 is in a horizontal state, improves the position stability of the printing material, and thus improves the printing quality.

[0056] The locking assembly 40 can lock the bed plate 10 after the bed plate 10 is leveled, that is, the bed plate 10 is difficult to move relative to the support 20 after being leveled, so that the position of the bed plate 10 is stable. Since the support 20 reinforces the bed plate 10, the probability of deformation of the bed plate 10 is reduced, the rigidity of the whole heat bed 100 is improved, the whole heat bed 100 is also difficult to deform, and thus the position of the material output by the 3D printer is accurate, and the printing quality is improved.

[0057] Please refer to Figure 3 and Figure 5 In some embodiments, the locking assembly 40 includes a limiting piece 41 and a locking piece 42, the limiting piece 41 is arranged on the bed plate 10 and abuts against the support 20, and the locking piece 42 connects the limiting piece 41 and the support 20. The limiting piece 41 and the locking piece 42 cooperate to limit the freedom of the bed plate 10 in the first direction W relative to the support 20, and the first direction W is the same as the thickness direction of the bed plate 10.

[0058] In this way, the limiting piece 41 and the locking piece 42 cooperate to lock the bed plate 10 after leveling. Specifically, the limiting piece 41 can be fixed with the bed plate 10 by welding, threaded connection or the like, or the limiting piece 41 is integrally formed with the bed plate 10 by die casting. The limiting piece 41 abuts against the support 20, and the locking piece 42 connects the limiting piece 41 and the support 20, so that the support 20 can limit the bed plate 10 through the limiting piece 41 and the locking piece 42.

[0059] As shown in Figure 4 , the first direction W is the same as the thickness of the bed plate 10, and when the heat bed 100 is normally used, the thickness of the bed plate 10 is the vertical direction because the bed plate 10 is arranged horizontally. At this time, the first direction W is the vertical direction. That is, under the cooperation of the limiting piece 41 and the locking piece 42, the first bed plate 10 is difficult to move in the vertical direction.

[0060] Please refer to Figure 5 and Figure 6In some embodiments, the limiting member 41 comprises a first sub-member 411 provided with a first through hole 4111, the locking member 42 is arranged through the first through hole 4111 along a second direction Y and inserted into the support member 20, the second direction Y is perpendicular to the first direction W.

[0061] In this way, after the locking member 42 is arranged through the first through hole 4111 and inserted into the support member 20, the first sub-member 411 can be fixedly connected with the support member 20, and since the first sub-member 411 is connected with the bed board 10, the bed board 10 is fixed relative to the support member 20, thereby limiting the bed board 10 from moving relative to the support member 20 along the first direction W.

[0062] The first sub-member 411 is in the shape of a sheet or a plate, the length direction of the first sub-member 411 extends along the first direction W, and the tensile strength of the first sub-member 411 along the first direction W is greater than that along the second direction Y, in other words, the first sub-member 411 has greater tensile strength in the length direction, so that the thermal bed 100 has high rigidity and is not easy to deform along the first direction W, thereby ensuring the flatness of the thermal bed 100 along the first direction W. While the tensile strength along the second direction Y is weaker, so that the deformation of the thermal bed 100 during the heating and cooling process can be absorbed, and the internal stress caused by thermal expansion and contraction of the thermal bed 100 is avoided to cause the thermal bed 100 to bend and deform along the first direction W, thereby affecting the flatness.

[0063] Specifically, the first sub-member 411 can abut against the outer side of the support member 20, the locking member 42 can be a screw, and the support member 20 can be provided with a threaded hole, and the locking member 42 can be screw-connected with the threaded hole of the support member 20, so that the locking member 42 is stably connected with the support member 20.

[0064] As discussed above, the first direction W can be a vertical direction, and then during normal use of the thermal bed 100, the second direction Y can be a horizontal direction.

[0065] Please refer to Figure 5 and Figure 6 In some embodiments, the first through hole 4111 is a long hole or a waist round hole, and the length of the first through hole 4111 extends along the first direction W. Since the first sub-member 411 is fixedly connected with the bed board 10, during the leveling of the bed board 10, the first sub-member 411 will move along with the bed board 10 in the first direction W, and the position of the first through hole 4111 will also change. In this way, the first through hole 4111 is a long hole or a waist round hole, so that the first through hole 4111 can adapt to different positions of the bed board 10, thereby enabling the locking member 42 to be inserted into the support member 20.

[0066] The length of the long hole is greater than the width. The long hole can be a rectangular hole or the like. The waist round hole is a hole with two ends in the first direction W being semicircular, and the size of the waist round hole in the first direction W is also greater than the size in the second direction Y.

[0067] Referring to Figure 5 and Figure 6 In some embodiments, the limiting piece 41 includes a second sub-piece 412 spaced apart from the first sub-piece 411, the second sub-piece 412 includes a first limiting part 4121 and a second limiting part 4122 connected with the first limiting part 4121, the first limiting part 4121 abuts against the support piece 20 along the first direction W, and the second limiting part 4122 is connected with the bed plate 10 and abuts against or is spaced apart from the support piece 20 along the second direction Y, the second sub-piece 412 is L-shaped or Z-shaped, and the rigidity of the second sub-piece 412 along the first direction W is weaker than the rigidity of the first sub-piece 411.

[0068] In this way, the second limiting part 4122 is connected with the bed plate 10, so that the second sub-piece 412 and the bed plate 10 can be fixed together. The second limiting part 4122 abuts against the support piece 20 along the second direction Y, and the first limiting part 4121 abuts against the support piece 20 along the first direction W, so that the second sub-piece 412 can be kept stable relative to the support piece 20, and further limit the movement of the bed plate 10 relative to the support piece 20 along the first direction W and the second direction Y, improve the position stability of the bed plate 10, and provide pre-positioning during assembly, thereby facilitating leveling and fixing the first sub-piece 411.

[0069] Further, the second sub-piece 412 is L-shaped or Z-shaped, so that the second sub-piece 412 is easy to connect the bed plate 10 and the limiting piece 41. For example, when the second sub-piece 412 is L-shaped, the first limiting part 4121 is in the shape of a sheet and is arranged horizontally, and the second limiting part 4122 is in the shape of a sheet and is arranged vertically. When the second sub-piece 412 is Z-shaped, it means that the second sub-piece 412 has two horizontal sheets (e.g., the second limiting part 4122) and a vertical sheet (e.g., the first limiting part 4121), and the vertical sheet connects the two horizontal sheets.

[0070] The rigidity of the second sub-piece 412 along the first direction W is weaker than the rigidity of the first sub-piece 411, that is, the second sub-piece 412 is more easily deformed along the first direction W, and the first limiting part 4121 of the second sub-piece 412 can absorb the deformation caused by thermal expansion and contraction of the bed plate 10, so that the shape of the bed plate 10 is more stable, and the printing effect of the 3D printer can be improved. In addition, the first limiting part 4121 of the second sub-piece 412 can provide pre-positioning during assembly of the thermal bed 100.

[0071] Referring to Figure 5In some embodiments, the first limiting part 4121 is provided with a second through hole 4123, and the locking piece 42 is arranged in the second through hole 4123 along the first direction W and inserted into the support 20. In this way, the locking piece 42 passes through the second through hole 4123 and is inserted into the support 20, so that the stability of the second sub-piece 412 limiting the bed plate 10 can be further improved. Specifically, the depth of the second through hole 4123 extends along the first direction W. After the bed plate 10 is leveled, the locking piece 42 can lock the first limiting part 4121 on the support 20 along the first direction W, so that the second sub-piece 412 is fixedly connected with the support 20.

[0072] It should be noted that the number of locking pieces 42 is multiple, and the multiple locking pieces 42 correspond to different first sub-pieces 411 and second sub-pieces 412 respectively.

[0073] Please refer to Figure 6 In some embodiments, the number of first sub-pieces 411 is multiple, and the number of second sub-pieces 412 is one. The multiple first sub-pieces 411 and the second sub-piece 412 are arranged at intervals along the circumference of the bed plate 10, and at least part of the first sub-pieces 411 are arranged at the edge positions of the bed plate 10.

[0074] In this way, the multiple first sub-pieces 411 and the second sub-piece 412 cooperate to limit the bed plate 10 at different positions of the bed plate 10, improve the stability of the bed plate 10, and further improve the rigidity of the hot bed 100. In addition, at least part of the first sub-pieces 411 are arranged at the edge positions of the bed plate 10, so that the first sub-pieces 411 do not affect other structures of the bed plate 10, and the normal use of the bed plate 10 is ensured.

[0075] In one example, the number of first sub-pieces 411 is six, and the six first sub-pieces 411 are arranged at intervals along the circumference of the bed plate 10. In order to make the stress of the bed plate 10 more uniform, the action point of the resultant force of the six first sub-pieces 411 and the second sub-piece 412 on the bed plate 10 is located at the center of the bed plate 10.

[0076] Please refer to Figure 6 In some embodiments, the bed plate 10 is rectangular, and the number of first sub-pieces 411 at the corresponding edge positions of the bed plate 10 is equal. Or, the number of first sub-pieces 411 at the edge positions of the bed plate 10 provided with the first sub-pieces 411 is equal. In one example, the bed plate 10 has four edges, and among the three edges of the bed plate 10, two first sub-pieces 411 are arranged at the edge position of each bed plate 10. In this way, the distribution positions of the multiple first sub-pieces 411 are uniform, which can improve the stability of the connection between the bed plate 10 and the support 20, and further improve the rigidity of the whole hot bed 100.

[0077] In some embodiments, the first sub-piece 411 has a smaller rigidity in the second direction Y than in 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-piece 411 can be arranged at the edge position of the bed plate 10, the first sub-piece 411 can constrain the bed plate 10 at the edge position of the bed plate 10. After the bed plate 10 is heated, the bed plate 10 can be deformed in the horizontal direction. If the first sub-piece 411 has a larger constraint force on the bed plate 10 in the horizontal direction, the edge position of the bed plate 10 is substantially fixed. Thus, the bed plate 10 can be deformed in the middle position, which can damage the flatness of the bed plate 10 and reduce the printing quality of the 3D printer.

[0078] Therefore, the first sub-piece 411 has a smaller rigidity in the second direction Y than in the first direction W, so that the first sub-piece 411 is easily deformed in the second direction Y to absorb the deformation of the bed plate 10 in the second direction Y after the bed plate 10 is heated. Thus, the flatness of the bed plate 10 is better, and the printing quality of the 3D printer can be improved.

[0079] Please refer to Figures 7-9 In some embodiments, the support piece 20 includes a plurality of support segments 21, which are sequentially connected and extend along the circumference of the bed plate 10. The plurality of support segments 21 form a closed loop structure 22 with a continuous cross section together with the bed plate 10 and the limiting piece 41.

[0080] Thus, the plurality of support segments 21 form the closed loop structure 22 with a continuous cross section together with the bed plate 10 and the limiting piece 41. In this way, the support piece 20 can be integrated with the bed plate 10 through the limiting piece 41 to improve the rigidity of the hot bed 100. Specifically, the plurality of support segments 21 can be an integral structure. For example, the plurality of support segments 21 can be manufactured by stamping or other processes. The plurality of support segments 21 are sequentially connected to form a ring shape.

[0081] As Figure 9 shown, the path of the closed loop structure 22 can be the bed plate 10→one limiting piece 41→a support segment 21→another limiting piece 41→the bed plate 10.

[0082] Please refer to Figure 3 , Figure 4 and Figure 7 In some embodiments, the support piece 20 has an overall shape of a mouth-shaped character. In a cross section perpendicular to the bed plate 10, the cross section of the support segment 21 has a U-shaped cross section, and the opening of the U-shaped cross section of the support segment 21 faces the bed plate 10.

[0083] In this way, the support 20 in the shape of a mouth can improve the rigidity of the support 20 itself as a whole, and can support the four corners of the bed plate 10, thereby improving the rigidity of the four corners of the bed plate 10 and reducing the risk of deformation of the bed plate 10. In addition, the cross section of the support section 21 is in the shape of a U, which can not only improve the rigidity of the support 20, but also increase the volume of the closed loop structure 22, which is conducive to accommodating more structural components in the closed loop structure 22.

[0084] Referring to Figure 3 and Figure 4 In some embodiments, the thermal bed 100 comprises a heating member 50 and a heat preservation member 60, the heating member 50 is at least partially arranged in the heat preservation member 60 and is in conductive connection with the bed plate 10, and the heat preservation member 60 wraps the heating member 50 and part of the bed plate 10.

[0085] In this way, the heating member 50 can heat the bed plate 10, so that the bed plate 10 can transfer heat to the printing material. The heating member 50 is at least partially arranged in the heat preservation member 60, and the heat preservation member 60 at least partially penetrates the support 20, which can improve the compactness of the structure of the thermal bed 100. The heat preservation member 60 wraps the heating member 50, that is, the heat preservation member 60 can cover the heating member 50, thereby reducing heat dissipation of the heating member 50 and improving the heating efficiency of the heating member 50 on the bed plate 10.

[0086] Specifically, the heating member 50 can be a resistance heating part such as a heat pipe, a heating wire, a heating sheet, etc. The heat preservation member 60 can be made of low thermal conductivity materials such as polyurethane foam, glass fiber, plastic, etc. The heat preservation member 60 can be fixed with the bed plate 10 by means of bonding, screws, buckling connection, etc. The limiting member 41 on the bed plate 10 penetrates the heat preservation member 60 and is connected with the support 20.

[0087] Referring to Figures 10-12 In some embodiments, the elastic leveling device 30 comprises an elastic member 31 and an adjusting member 32, the elastic member 31 is arranged between the bed plate 10 and the support 20, and the adjusting member 32 connects the bed plate 10 and the support 20. The support 20 is provided with a screw hole 23, one end of the adjusting member 32 is provided with a thread, the adjusting member 32 penetrates the bed plate 10, and one end of the adjusting member 32 is screwed into the screw hole 23, so as to adjust the position between the bed plate 10 and the support 20 to level the bed plate 10.

[0088] In this way, during the process of screwing into the screw hole 23, the adjusting member 32 can drive the bed plate 10 to move downward, and the elastic member 31 is in a compressed state. During the process of unscrewing from the screw hole 23, the elastic member 31 is elastically deformed and pushes the bed plate 10 to move upward. Under the cooperation of the adjusting member 32 and the elastic member 31, the flatness of the bed plate 10 can be adjusted.

[0089] Specifically, the elastic member 31 is a coil spring, and the adjusting member 32 is a screw. When the adjusting member 32 is screwed into the threaded hole 23, the elastic member 31 is in a compressed state. In order to facilitate the operation of the adjusting member 32, the adjusting member 32 can be screwed into the threaded hole 23 from top to bottom.

[0090] The number of elastic members 31 and adjusting members 32 is at least three, and the elastic members 31 and adjusting members 32 are arranged one by one. The at least three adjusting members 32 are arranged at different vertices of the virtual polygon, or in other words, the positions of the at least three adjusting members 32 can define a plane. In this way, the bed plate 10 can be adjusted to be horizontal by the adjusting members 32 at different positions.

[0091] Please refer to Figures 13-15 In some embodiments, the heating member 50 is in the form of a strip, and the heating member 50 is in thermal contact with the bed plate 10. The heating member 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. The number of third heating sections 53 is at least one. The first heating section 51, the second heating section 52, the at least one third heating section 53, and the fourth heating section 54 are arranged in sequence along a first planar direction Z1 and extend along a second planar direction Z2. The first planar direction Z1 intersects the second planar direction Z2. The first heating section 51 is arranged adjacent to one side edge of the bed plate 10.

[0092] The fifth heating section 55 and the second heating section 52 are connected to each other at an end close to the center of the bed plate 10. The fifth heating section 55 extends from the second heating section 52 to the first heating section 51. The fifth heating section 55 forms a first power connection end 501 of the heating member 50. The first power connection end 501 is arranged apart from the first heating section 51. The sixth heating section 56 is arranged apart from the fifth heating section 55 along the second planar direction Z2.

[0093] The sixth heating section 56 and the third heating section 53 close to the first heating section 51 are connected to each other at an end close to the center of the bed plate 10. The sixth heating section 56 extends from the third heating section 53 close to the first heating section 51 to the first heating section 51. The sixth heating section 56 forms a second power connection end 502 of the heating member 50. The second power connection end 502 is arranged apart from the first heating section 51.

[0094] In the above embodiments, the first heating section 51, the second heating section 52, the at least one third heating section 53, and the fourth heating section 54 are sequentially and spacedly arranged along the first planar direction Z1 and are all arranged to extend along the second planar direction Z2, so that the heating sections can be arranged reasonably in the first planar direction Z1. Since the heating member 50 is an integral strip, the wiring ends of the heating member 50 need to be arranged close to each other. At this time, the sixth heating section 56 is spacedly arranged along the second planar direction Z2 from the fifth heating section 55, and the first electrical connection end 501 and the second electrical connection end 502 are arranged to face the first heating section 51, so that the fifth heating section 55 and the sixth heating section 56 can be arranged reasonably in the second planar direction Z2, and the area formed between the heating sections is reduced, so that the temperature is lower. Therefore, by reasonably arranging the positions of the first heating section 51, the second heating section 52, the third heating section 53, the fourth heating section 54, the fifth heating section 55, and the sixth heating section 56, the heating sections form an asymmetric arrangement structure, and the heating member 50 can heat the bed plate 10 more uniformly, so that the printing quality can be improved.

[0095] Specifically, the bed plate 10 is square as a whole, the first planar direction Z1 is the same as the extension direction of one edge of the bed plate 10, and the second planar direction Z2 is the same as the extension direction of another edge. The first to sixth heating sections are also strips, and the extension direction of the heating section is the length direction of the heating section.

[0096] The first electrical connection end 501 and the second electrical connection end 502 both face the first heating section 51. After the first electrical connection end 501 and the second electrical connection end 502 are electrified, the heating member 50 can generate heat to heat the bed plate 10.

[0097] Please refer to Figures 14-16 In some embodiments, the heating member 50 includes a seventh heating section 57, an eighth heating section 58, and a ninth heating section 59. The seventh heating section 57 connects the first heating section 51 and the second heating section 52,

[0098] When the number of the third heating section 53 is one, the eighth heating section 58 connects the third heating section 53 and the fourth heating section 54;

[0099] When the number of the third heating section 53 and the eighth heating section 58 is both plural, part of the eighth heating sections 58 connect the third heating sections 53 in series, and one eighth heating section connects the third heating section 53 and the fourth heating section 54 close to each other;

[0100] The ninth heating section 59 connects the first heating section 51 and the fourth heating section 54, and the seventh heating section 57, the fifth heating section 55, the sixth heating section 56, and the ninth heating section 59 are sequentially arranged along the second planar direction Z2.

[0101] In this way, 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 member 50 forms a continuous structure, which is conducive to the uniform heating of the bed plate 10 by the heating member 50.

[0102] Specifically, as shown in the example in which the number of the third heating sections 53 is one, the number of the eighth heating sections 58 is also one, and the eighth heating section 58 is arranged close to one side edge of the bed plate 10. Figure 15

[0103] When the number of the third heating sections 53 and the number of the eighth heating sections 58 are both plural, part of the eighth heating sections 58 are arranged close to one side edge of the bed plate 10, and part of the eighth heating sections 58 are arranged close to the center of the bed plate 10. As shown in the example in which the number of the third heating sections 53 and the number of the eighth heating sections 58 are both three, one of the eighth heating sections 58 is arranged close to the center of the bed plate 10 and connected to the two adjacent third heating sections 53. The other two eighth heating sections 58 are arranged close to one side edge of the bed plate 10, and among the two eighth heating sections 58 arranged close to one side edge of the bed plate 10, one of the eighth heating sections 58 is connected to the fourth heating section 54 and the third heating section 53 close to the fourth heating section 54, and the other eighth heating section 58 is connected to the two adjacent third heating sections 53. Figure 16

[0104] It can be understood that in other embodiments, the number of the third heating sections 53 and the number of the eighth heating sections 58 can also be 5, 7, etc., an odd number greater than 3.

[0105] The number of the heating members 50 can be one or plural, and when the number of the heating members 50 is plural, the plural heating members 50 are arranged side by side. As shown in the example in which the number of the heating members 50 is one. Figure 14 As shown in the example in which the number of the heating members 50 is two. Figure 6

[0106] Please refer to Figure 13 and Figure 14 In some embodiments, the side of the bed plate 10 that is in heat-conducting connection with the heating member 50 is made of a heat-conducting material, the thermal conductivity of the heat-conducting material is between 140 w / m*k-180 w / m*k, and in the cross section perpendicular to the axis direction of the heating member 50, the contact contour length of the heating member 50 and the bed plate 10 is between 9.4 mm-12 mm.

[0107] ​​​Therefore, the heating of the bed plate 10 by the heating element 50 is more uniform, and the printing quality of the 3D printer can be improved. Specifically, the thermal conductivity of the heat-conductive 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 profile length of the heating element 50 and the bed plate 10 can be 9.4 mm, 10 mm, 10.5 mm, 11 mm, 12 mm, etc.

[0108] In one example, the heat-conductive material of the bed plate 10 can be an aluminum alloy, the heating element 50 is a circular tube, the diameter of the heating element 50 is about 6.5 mm, and the semicircular arc length of the heating element 50 is in contact with the bed plate 10, which is about 10.2 mm.

[0109] Referring to Figure 14 and Figure 15 In some embodiments, the distance between the third heating section 53 and the fourth heating section 54 along the first planar direction Z1 is A, and A is in the range of 65 mm-85 mm. For example, A can be 65 mm, 68 mm, 70 mm, 72 mm, 80 mm, 83 mm, 85 mm, etc. In this way, the distance between the third heating section 53 and the fourth heating section 54 is appropriate, so that the temperature of the bed plate 10 around the third heating section 53 and the fourth heating section 54 can be within a preset temperature range, and the temperature uniformity of the bed plate 10 is improved.

[0110] It should be noted that A is the minimum distance between the third heating section 53 and the fourth heating section 54.

[0111] Referring to Figure 14 and Figure 15 In some embodiments, the first heating section 51 and the fourth heating section 54 are symmetrically arranged about the center of the bed plate 10, and the size of the bed plate 10 along the first planar direction Z1 is B, and A / B is in the range of 0.18-0.25. For example, A / B can be 0.18, 0.19, 0.20, 0.22, 0.25, etc.

[0112] Further, when A is in the range of 65 mm-85 mm, B can be in the range of 260 mm-470 mm. For example, B can be 260 mm, 300 mm, 242 mm, 351 mm, 395 mm, 454 mm, 470 mm, etc. In this way, the ratio of A / 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 uniformity of the heating of the bed plate 10.

[0113] Referring to Figure 14 and Figure 15In some embodiments, along the first planar direction Z1, the distance between the first heating section 51 and the fourth heating section 54 is C, and C / B is in the range of 0.8-0.90. For example, C / B is in the range of 0.8, 0.83, 0.85, 0.90, etc. In this way, the distance between the first heating section 51 and the fourth heating section 54 and the corresponding side edge of the bed plate 10 is appropriate, so that the temperature difference between the edge position of the bed plate 10 and the center position of the bed plate 10 is low, and the heating uniformity of the bed plate 10 is improved.

[0114] Referring to Figure 14 and Figure 15 In some embodiments, along the first planar direction Z1, the distance between the third heating section 53 and the fourth heating section 54 is A, and the distance between the first heating section 51 and the second heating section 52 is D, and D=(1.2-1.4)*A is satisfied.

[0115] Since the first heating section 51, the second heating section 52, the fifth heating section 55, and the seventh heating section 57 are arranged in a substantially closed manner, 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 jointly affected by the four heating sections, and therefore, along the first planar 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, so that the temperature difference between the various areas of the bed plate 10 is small, and the heating uniformity of the heating member 50 on the bed plate 10 is improved.

[0116] In one example, A is in the range of 65mm-85mm, and therefore, D is in the range of 78mm-119mm. For example, D can be 78mm, 82mm, 85mm, 100mm, 110mm, 119mm, etc.

[0117] Referring to Figure 14 and Figure 15 In some embodiments, the distance between 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 and the edge of the bed plate 10 is E, and E is in the range of 25mm-35mm. Since 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 are arranged close to the bed plate 10, and E is in the range of 25mm-35mm, the temperature difference between the edge position of the bed plate 10 and the center position of the bed plate 10 is low, and the heating uniformity of the bed plate 10 is improved. For example, E can be 25mm, 27mm, 30mm, 32mm, 35mm, etc.

[0118] Referring to Figure 14 andFigure 15 In some embodiments, along the first planar direction Z1, the size of the bedplate 10 is B, and E / B is 0.07-0.1. For example, E / B can be 0.07, 0.08, 0.09, 0.1, etc. In the case that E is in the range of 25mm-35mm, B can be in the range of 260mm-470mm. In this way, the distance of E / B is suitable so that the temperature difference between the edge position of the bedplate 10 and the center position of the bedplate 10 is low, improving the heating uniformity of the bedplate 10.

[0119] Referring to Figure 14 and Figure 15 In some embodiments, along the second planar direction Z2, the distance between the sixth heating section 56 and the ninth heating section 59 is F, and F is in the range of 65mm-85mm. For example, F can be 65mm, 68mm, 70mm, 72mm, 80mm, 83mm, 85mm, etc. In this way, the distance between the sixth heating section 56 and the ninth heating section 59 is suitable so that the temperature of the bedplate 10 located around the sixth heating section 56 and the ninth heating section 59 can be within the preset temperature range, improving the temperature uniformity of the bedplate 10.

[0120] Referring to Figure 14 and Figure 15 In some embodiments, along the second planar direction Z2, the distance between the fifth heating section 55 and the sixth heating section 56 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. In the case that F is in the range of 65mm-85mm, G can be in the range of 58mm-94mm. For example, G can be 58mm, 60mm, 65mm, 70mm, 85mm, 94mm, etc. In this way, the size of G and F is close, so that the temperature difference between the area between the fifth heating section 55 and the sixth heating section 56 and the area between the sixth heating section 56 and the ninth heating section 59 is small, thereby improving the temperature uniformity of the hot bed 100.

[0121] Referring to Figure 14 and Figure 15In some embodiments, the distance H between the fifth heating section 55 and the seventh heating section 57 along the second planar direction Z2 is 1.5-1.7 times of F. Since the first heating section 51, the second heating section 52, the fifth heating section 55 and the seventh heating section 57 are arranged in a substantially closed manner, the temperature of the region enclosed by the first heating section 51, the second heating section 52, the fifth heating section 55 and the seventh heating section 57 is jointly affected by the four heating sections. Therefore, the distance H between the fifth heating section 55 and the seventh heating section 57 along the second planar direction Z2 is set to be larger than the distance F between the sixth heating section 56 and the ninth heating section 59, so that the temperature difference between the regions of the bed plate 10 is small, and the heating uniformity of the heating member 50 to the bed plate 10 is improved.

[0122] In one example, F is in the range of 65-85 mm, and therefore, H is in the range of 97-145 mm. For example, H can be 97 mm, 100 mm, 105 mm, 130 mm, 138 mm, 145 mm, etc.

[0123] Referring to Figure 14 In some embodiments, the connection between the second heating section 52 and the fifth heating section 55 is connected through a first circular arc section 591, the connection between the third heating section 53 and the sixth heating section 56 is connected through a second circular arc section 592, the connection between the fourth heating section 54 and the ninth heating section 59 is connected through a third circular arc section 593, and the bed plate 10 comprises a plate body 11 and a first heat conduction rib 12 arranged on the side of the heat conduction connection surface of the plate body 11, and the first heat conduction rib 12 connects the first circular arc section 591, the second circular arc section 592 and the third circular arc section 593.

[0124] In this way, the first heat conduction rib 12 can connect the multiple heating sections and transfer the heat of the region with higher temperature to the region with lower temperature, so that the temperature difference between the regions of the bed plate 10 is small, and the temperature uniformity of the bed plate 10 is improved.

[0125] Specifically, the plate body 11 and the first heat conduction rib 12 can be an integrally formed structure. The plate body 11 can be a square structure as a whole, and the first heat conduction rib 12 can extend along the diagonal direction of the plate body 11, and the first circular arc section 591, the second circular arc section 592 and the third circular arc section 593 are arranged along the diagonal direction of the plate body 11.

[0126] Referring to Figure 15 In some embodiments, the bed plate 10 comprises a plate body 11 and a limiting rib 13 arranged on the side of the heat conduction connection surface of the plate body 11, and the limiting rib 13 is formed with a receiving groove 131, and the heating member 50 is accommodated in the receiving groove 131.

[0127] In this way, the limiting ribs 13 can limit the position of the heating element 50, so that the heating element 50 can be stably connected to the bed plate 10, and the heating effect of the heating element 50 on the bed plate 10 is improved. Specifically, the accommodating grooves 131 can be sized and shaped to cooperate with the heating element 50 to increase the connection area of the heating element 50 with the bed plate 10, and the heating efficiency of the heating element 50 on the bed plate 10 is improved.

[0128] Referring to Figure 13-15 In some embodiments, a heat conductor 14 is arranged in the accommodating grooves 131, and the heat conductor 14 connects the limiting ribs 13 and the heating element 50. In this way, the heat conductor 14 can improve the efficiency of the heating element 50 in conducting heat to the bed plate 10, and the heating efficiency of the heating element 50 is improved. In one example, the heat conductor 14 is, for example, a heat-conducting silicone grease, which is in a paste form, and can increase the connection area of the limiting ribs 13 with the heating element 50.

[0129] Referring to Figure 13-15 In some embodiments, the bed plate 10 includes a second heat-conducting rib 15 arranged on the surface of the plate body 11, the second heat-conducting rib 15 connects different areas of the plate body 11, and the second heat-conducting rib 15 is located on the same side of the plate body 11 as the limiting ribs 13. In this way, the second heat-conducting rib 15 can transfer heat from an area with a higher temperature to an area with a lower temperature, so that the temperature difference between different areas of the bed plate 10 is small, and the temperature uniformity of the bed plate 10 is improved.

[0130] Specifically, the second heat-conducting rib 15 can extend along the first planar direction Z1 or the second planar direction Z2, and the number of the second heat-conducting rib 15 can be multiple, and the multiple second heat-conducting ribs 15 are arranged in a cross manner, so that the temperature difference between different positions of the bed plate 10 is small.

[0131] In summary, in one example, as Figure 13-15 shown, Figure 13-15 is a thermal simulation cloud diagram of the bed plate 10 according to an embodiment of the present application, after the heating element 50 heats the bed plate 10, the maximum temperature of the bed plate 10 is about 100℃, and the minimum temperature is about 95℃, and the temperature difference is less than or equal to 5℃, the temperature difference is small, and the temperature uniformity of the bed plate 10 is good.

[0132] As Figure 17 shown, Figure 17 Figure 18 Figure 18 is a thermal simulation cloud diagram of a bed plate in the related art, after the heating element heats the bed plate, the maximum temperature of the bed plate is about 102℃, and the minimum temperature is about 90℃, and the temperature difference is about 12℃, the temperature difference is large, and the temperature uniformity of the bed plate is poor.

[0133] In the description of the specification, reference to "one embodiment", "certain embodiments", "some embodiments", "exemplary embodiments", "a specific example", or "some examples" etc., mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the above expressions in various places in the specification are not necessarily referring to the same embodiment or example. Moreover, describing a particular feature, structure, material, or characteristic as included in an embodiment or example is intended to convey that the particular feature, structure, material, or characteristic is included in at least one embodiment or example of the application. Thus, appearances of the expressions "in one embodiment" or "in an embodiment" are not necessarily referring to the same embodiment.

[0134] Although the embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations to these embodiments could be made without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hot bed for a 3D printer, characterized in that, The hot bed comprises: a bed plate; a support arranged at one side of the bed plate; a resilient leveling device connecting the bed plate and the support for adjusting the flatness of the bed plate; and a locking assembly connecting the bed plate and the support for locking the position of the bed plate relative to the support after the bed plate is leveled.

2. The thermal bed of claim 1, wherein, The locking assembly comprises a limiting piece arranged on the bed plate and abutting against the support, and a locking piece connecting the limiting piece and the support, the limiting piece and the locking piece cooperate to limit the degree of freedom of the bed plate relative to the support in a first direction, which is the same as the thickness direction of the bed plate.

3. The thermal bed of claim 2, wherein, The limiting piece comprises a first sub-piece provided with a first through hole, and the locking piece is arranged in the first through hole in a second direction perpendicular to the first direction and inserted into the support.

4. The thermal bed of claim 3, wherein, The first sub-piece is in a sheet or plate shape, the length direction of the first sub-piece extends along the first direction, and the tensile strength of the first sub-piece along the first direction is greater than that along the second direction.

5. The thermal bed of claim 3, wherein, The limiting piece comprises a second sub-piece arranged in space from the first sub-piece, the second sub-piece comprises a first limiting part and a second limiting part connected with the first limiting part, the first limiting part abuts against the support along the first direction, the second limiting part is connected with the bed plate and abuts against the support along the second direction or is arranged in space from the support, the second sub-piece is in an L shape or a Z shape, and the rigidity of the second sub-piece along the first direction is weaker than that of the first sub-piece.

6. The thermal bed of claim 5, wherein, The first limiting part is provided with a second through hole, and the locking piece is arranged in the second through hole in the first direction and inserted into the support.

7. The thermal bed of claim 5, wherein, The number of the first sub-pieces is plural, and the number of the second sub-pieces is one, the plural first sub-pieces and the second sub-piece are arranged in space along the circumferential direction of the bed plate, and at least part of the first sub-pieces are arranged at the edge position of the bed plate.

8. The thermal bed of claim 7, wherein, The bed plate is in a rectangular shape, and the number of the plural first sub-pieces at the corresponding edge position of the bed plate is equal.

9. The thermal bed of claim 2, wherein, The support comprises plural support segments, the plural support segments are sequentially connected in head-tail mode and extend along the circumferential direction of the bed plate, and the plural support segments jointly form a closed loop structure with a continuous cross section through the limiting piece and the bed plate.

10. The thermal bed of claim 9, wherein, The support is in a mouth shape as a whole, along a cross section perpendicular to the bed plate, the cross section of the support segment is in a U shape, and the opening of the cross section of the U-shaped support segment is arranged towards the bed plate.

11. The thermal bed of claim 9, wherein, The hot bed comprises a heating piece and a heat preservation piece, the heating piece is at least partially arranged in the heat preservation piece and is in conductive connection with the bed plate, and the heat preservation piece wraps the heating piece and part of the bed plate.

12. The thermal bed of claim 1, wherein, The elastic leveling device comprises an elastic member and an adjusting member, the elastic member is arranged between the bed board and the support, the adjusting member connects the bed board and the support, the support is provided with a screw hole, one end of the adjusting member is provided with a screw thread, the adjusting member is arranged in the bed board, and one end of the adjusting member is screwed in the screw hole, so that the position between the bed board and the support is adjusted, and the bed board is leveled.

13. A 3D printer characterized by, The hot bed comprises the hot bed according to any one of claims 1-12.

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