Hot bed and 3D printer

Abstract

The utility model discloses a hot bed and 3D printer relates to 3D printing technical field, the hot bed includes shell and heating module, the shell is equipped with the cavity, forms the power supply area in the cavity, the power supply area deviates from the middle area of the cavity, the shell is used for bearing the printing panel; the heating module comprises a plurality of heating units, the two ends of each heating unit are connected to the power supply area, and the heating units form an annular structure. The technical scheme provided by the utility model aims to improve the heating efficiency of the hot bed.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field, especially a kind of hot bed and 3D printer. BACKGROUND

[0002] 3D printer is by extruding the fusible adhesion material layer by layer to printing panel to construct printing piece. In order to avoid the temperature of printing panel too low, resulting in the material extruded is affected by thermal expansion and contraction and appears edge lifting, usually printing panel is set on hot bed, so that printing panel has stable temperature. However, the current hot bed mechanism usually only realizes heating by single heating pipe, which leads to low heating efficiency. SUMMARY

[0003] The main purpose of the utility model is to provide a kind of hot bed and 3D printer, to improve the heating efficiency of hot bed.

[0004] To achieve the above object, the utility model provides a kind of hot bed, the hot bed includes:

[0005] Shell, the shell is equipped with containing cavity, the containing cavity is formed in power supply area, the power supply area deviates the middle region of the containing cavity, and the shell is used to carry printing panel;And

[0006] Heating module, the heating module includes multiple heating units, and both ends of each heating unit are connected to the power supply area, and the heating unit forms an annular structure.

[0007] In an embodiment, the containing cavity has middle region and peripheral region surrounding the middle region, and the power supply area is located in the peripheral region.

[0008] The hot bed further includes power supply module, and the power supply module is arranged in the power supply area and is suitable for power supply for the heating unit.

[0009] In an embodiment, the power supply area includes multiple, and the power supply module also includes multiple, and each power supply module is arranged in a power supply area.

[0010] Both ends of each heating unit are connected to a power supply module.

[0011] In an embodiment, the power supply module includes power supply, switch, temperature sensor and control unit, and the power supply and the switch are suitable for being arranged in series with the heating unit, and the control unit is electrically connected with the switch and the temperature sensor, and the temperature sensor is used to detect the temperature information of the heating unit, and the control unit controls the state of the switch according to the temperature information.

[0012] In an embodiment, the power supply area comprises a plurality of power supply areas, each of the heating units is connected to one of the power supply areas, and forms a loop, and the plurality of heating units form a plurality of loops which are arranged in a nested manner.

[0013] Alternatively, the power supply area comprises one power supply area, and the plurality of heating units are arranged side by side and connected to the power supply area, and the heating units form a loop track which is arranged in an asymmetric manner.

[0014] In an embodiment, the loop track formed by the heating units comprises a first section, a second section and a third section, the first section surrounds the periphery of the cavity and forms a first end and a second end which are arranged in a spaced manner, the second section and the third section are connected to the first end and the second end respectively, and the second section and the third section extend to the middle of the cavity in parallel and are connected to the power supply area.

[0015] In an embodiment, the heating module comprises a first heating pipe and a second heating pipe,

[0016] The extension directions of the first heating pipe and the second heating pipe are consistent, or the radial dimensions of the first heating pipe and the second heating pipe are different, or the radial dimension of the first heating pipe is greater than that of the second heating pipe, the first heating pipe is arranged at an edge position of the shell, the first heating pipe is arranged at a middle position of the shell, or the first heating pipe and the second heating pipe are independently heated, the first heating pipe is arranged at an edge position of the shell, and the second heating pipe is arranged at a middle position of the shell.

[0017] In an embodiment, the heating module further comprises a heat-conducting member and an elastic member, the cavity is provided with a limiting member for limiting the heating unit, the heat-conducting member is arranged between the heating unit and the shell, and the elastic member has opposite first and second ends, the first end is fixed to the cavity wall or the limiting member, and the second end elastically abuts against the heating unit.

[0018] In an embodiment, the shell comprises an upper shell and a lower shell, the upper shell is used for bearing a printing panel, and the upper shell and the lower shell form the cavity in a closed manner.

[0019] The upper shell is provided with a limiting groove and a plurality of reinforcing ribs, the heating unit is limited in the limiting groove, and the plurality of reinforcing ribs are arranged away from the limiting groove.

[0020] The utility model also provides a 3D printer, the 3D printer comprises a printing panel and the heat bed, and the printing panel is detachably installed on the heat bed.

[0021] The technical scheme of the utility model discloses a heating module is arranged in the cavity of the shell to heat the printing panel placed on the shell, so that the temperature of the printing panel is maintained in a proper range. The heating module includes a plurality of heating units, which are connected to the power supply area and form an annular structure. The heating units fully circulate in the cavity to improve the uniformity of the heating module in heating the hot bed and reduce the possibility of temperature differences in different areas of the hot bed, thereby reducing the possibility of edge lifting of the printed part on the printing panel. When the hot bed is heated, the plurality of heating units can work simultaneously to improve the heating speed of the hot bed and raise the temperature of the printing panel to the preset temperature range as soon as possible, so that the 3D printer can print faster. The heating efficiency is improved, and the printing efficiency of the 3D printer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model or the prior art, the drawings needed in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in the drawings without creative labor.

[0023] Figure 1 The decomposition structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure.

[0024] Figure 2 The structure schematic diagram of the hot bed in an embodiment provided by the utility model is shown in the figure.

[0025] Figure 3 The structure schematic diagram of the hot bed in another embodiment provided by the utility model is shown in the figure.

[0026] Figure 4 The structure schematic diagram of the hot bed in still another embodiment provided by the utility model is shown in the figure.

[0027] Figure 5 The structure schematic diagram of the hot bed in still another embodiment provided by the utility model is shown in the figure.

[0028] Figure 6 The structure schematic diagram of the hot bed in still another embodiment provided by the utility model is shown in the figure.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, shell; 11, upper shell; 12, lower shell; 13, cavity; 14, middle area; 15, peripheral area; 16, power supply area; 2, heating unit; 21, first section; 22, second section; 23, third section; 3, power supply module; 31, power supply; 32, switch;

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] For related technologies, please refer to the relevant references. Figures 1 to 6 As shown, 3D printers construct parts by extruding molten, bondable material layer by layer onto a printing panel. To prevent the printing panel from becoming too cold, which could cause the extruded material to warp due to thermal expansion and contraction, the printing panel is typically placed on a heated bed to maintain a stable temperature. However, current heated bed mechanisms usually rely on a single heating element, resulting in low heating efficiency.

[0036] Based on the above problems and ideas, the utility model provides a hot bed, the hot bed includes casing 1 and heating module, casing 1 is equipped with cavity 13, forms the power supply area 16 in cavity 13, the power supply area 16 deviates the middle area 14 of the cavity 13, and the casing 1 is used to bear the printing panel, heating module includes a plurality of heating units 2, and both ends of each heating unit 2 are connected to the power supply area 16, and the heating unit 2 forms annular structure.

[0037] In the embodiment, in order to avoid the warping of the printed part contacting the printing panel due to thermal expansion and contraction, affecting the printing quality, the hot bed needs to heat the printing panel before printing. When the hot bed is heated, multiple heating units 2 can work simultaneously to improve the heating speed of the hot bed and raise the temperature of the printing panel to the preset temperature range as soon as possible, so that the 3D printer can print faster.

[0038] The heating unit 2 forms an annular structure and fully circulates in the cavity 13 to improve the uniformity of the heating module in heating the hot bed, reduce the possibility of temperature difference in different areas of the hot bed, and further reduce the possibility of warping of the printed part on the printing panel.

[0039] The two ends of the heating unit 2 are connected to the power supply area 16 to form a complete loop, and the power supply area 16 is arranged away from the middle area 14 of the cavity 13. It can be understood that when the 3D printer is printing, the middle area 14 of the cavity 13 corresponds to the middle area of the printing panel, which usually bears the printed part, so the power supply area 16 is arranged away from the middle area 14 to avoid the middle area 14 of the cavity 13 without a heating tube, resulting in a too low temperature in the middle area 14, affecting the forming quality of the printed part. The power supply area 16 can be provided with a power supply module 3 to supply power to the heating module. Alternatively, the power supply module 3 can also be arranged outside the cavity 13, and after the two ends of the heating unit 2 are connected to the power supply area 16, the power supply module 3 outside the cavity 13 is connected through related lines.

[0040] In an embodiment of the utility model, as shown in Figures 3 to 6 The cavity 13 has a middle area 14 and a peripheral area 15 surrounding the middle area 14, and the power supply area 16 is located in the peripheral area 15;

[0041] The hot bed further comprises a power supply module 3, which is arranged in the power supply area 16 and is adapted to supply power to the heating unit 2.

[0042] It can be understood that the printed part is generally placed in the middle of the printing panel, and correspondingly, the temperature control of the middle area 14 of the cavity 13 needs to be more accurate, and the power supply module 3 does not generate heat. In order to avoid the temperature of the middle area 14 being too low, the power supply area 16 is arranged in the peripheral area 15.

[0043] Meanwhile, the power supply area 16 is arranged in the peripheral area 15 of the accommodating cavity 13, which is closer to the edge of the shell 1, and is also conducive to the connection of the heating unit 2 and the external power supply module 3; and thus facilitates the installation of the built-in power supply module 3, and is conducive to the production of the heat bed.

[0044] In actual implementation, the beginning and end of the heating unit 2 are connected to the power supply area 16, and the middle part is arranged in the accommodating cavity 13 in a bent manner, so as to pass through as many areas of the accommodating cavity 13 as possible, thereby improving the uniformity of heating the shell 1.

[0045] In an embodiment of the present application, as shown in Figure 2 , Figure 4 and Figure 5 , the power supply area 16 includes a plurality of power supply areas, and the power supply module 3 also includes a plurality of power supply modules; each power supply module 3 is arranged in a power supply area 16; and the two ends of each heating unit 2 are connected to a power supply module 3.

[0046] In the embodiment, the heating unit 2 and the power supply module 3 are arranged one by one, so that the on-off of each heating unit 2 can be independently controlled. When the heat bed is running, the heating unit 2 in the accommodating cavity 13 can be correspondingly controlled by the power supply module 3 according to the area of the printing object occupying the printing panel. In the projection perpendicular to the printing panel direction, the heating unit 2 overlapping with the printing object is heated, and other heating units 2 can not be operated to save costs.

[0047] Specifically, in the projection perpendicular to the printing panel direction, the projection of the shell 1 can be divided into a plurality of heating areas, and a plurality of heating units 2 can pass through several of the plurality of heating areas, so that all the heating units 2 pass through all the heating areas. When the heat bed is running, the heating area overlapping with the projection of the printing object to be printed can be selected, and after the selected heating area is selected, the heating unit 2 passing through the selected heating area is controlled to operate and heat by the power supply module 3, so as to realize the heating of the heating module in the selected area.

[0048] Optionally, the projection shape of the shell 1 perpendicular to the printing panel direction is generally rectangular or square, and the shape of the heating area can be set as rectangular or square, which is not limited here.

[0049] In actual implementation, the printing object is generally placed in the center of the printing panel, and the larger the volume of the printing object, the larger the projection of the printing object perpendicular to the printing panel direction, which generally increases from the center to the periphery. Therefore, the extension trajectories of the plurality of heating units 2 can be arranged at different edge distances based on the center point of the accommodating cavity 13, so as to control the heating unit 2 corresponding to the projection of the printing object to heat, and avoid controlling the heating unit 2 to operate and pass through too many non-selected heating areas in addition to the selected heating area, thereby causing waste of work of the heating unit 2.

[0050] It can be understood that the heating area can be arranged in a circular ring or a rectangular ring or other regular ring shape based on the center point of the cavity 13. At least one heating unit 2 can be arranged in each heating area, and the heating unit 2 is arranged along the shape of the corresponding heating area.

[0051] In another embodiment of the present application, at least two heating units 2 can be connected to the same power supply area 16, which is not limited here.

[0052] In an embodiment of the present application, as shown in Figures 2 to 6 The power supply module 3 includes a power supply 31, a switch 32, a temperature sensor and a control unit. The power supply 31 and the switch 32 are adapted to be arranged in series with the heating unit 2. The control unit is electrically connected with the switch 32 and the temperature sensor. The temperature sensor is used to detect the temperature information of the heating unit 2, and the control unit controls the state of the switch 32 according to the temperature information.

[0053] In this embodiment, the power supply 31 provides power for the heating unit 2 to generate heat. The switch 32 can control the on-off of the heating unit 2 and the power supply 31, thereby controlling whether the heating module is running.

[0054] The temperature sensor can monitor whether the heating temperature of the heating unit 2 is within the preset range. When the temperature sensor detects that the temperature of the heating unit 2 exceeds the threshold temperature, the control unit controls the switch 32 to automatically turn off, so as to improve the safety of the heating bed.

[0055] In actual implementation, the power supply 31 is controlled by the control module to output power. When the temperature of the heating bed rises to the preset temperature, the control module reduces the output power of the power supply 31, so that the heat generated by the heating unit 2 and the heat dissipated to the surrounding environment of the heating bed form a dynamic balance, so that the temperature is maintained within the preset range.

[0056] In an embodiment of the present application, as shown in Figure 2 The power supply area 16 includes a plurality of power supply areas 16, and each heating unit 2 is connected to a power supply area 16 and forms a loop. The plurality of loops formed by the plurality of heating units 2 are arranged in a nested manner.

[0057] In this embodiment, since the printed object is placed in the center of the printing panel, the plurality of loops formed by the plurality of heating units 2 are arranged in a nested manner, and the annular heating area can be divided from the middle position to the peripheral position. Each heating unit 2 is powered by a power supply area 16, so that each annular heating area can be independently heated to adapt to different sizes of printed objects.

[0058] Optionally, the heating unit 2 is arranged in one-to-one correspondence with the power supply area 16, and the extension track of the heating unit 2 is arranged in central symmetry or axial symmetry, so that the heating module is more uniform in heating the shell 1. Taking a rectangular hot bed as an example, each heating unit 2 forms a quasi-rectangular loop, and the center points of the loops are communicated, and the edge center distance gradually expands.

[0059] In another embodiment, as shown in Figure 4 and Figure 5 , the heating unit 2 is arranged in symmetry, each heating unit 2 forms a quasi-rectangular loop, and the loops formed by the plurality of heating units 2 are arranged in symmetry along the X axis or the Y axis in the projection perpendicular to the printing panel.

[0060] Optionally, the power supply area 16 of each heating unit 2 is arranged in the peripheral area 15, and the extension track of the heating unit 2 can be arranged in a regular or irregular shape, but finally connected to the power supply area 16 in the peripheral area 15.

[0061] Optionally, when the loop tracks of the plurality of heating units 2 are arranged in nesting, the plurality of heating units 2 can also be connected to the same power supply area 16, and the center points of each loop are different.

[0062] In an embodiment of the present application, as shown in Figure 3 , the power supply area 16 is one, and the plurality of heating units 2 are arranged side by side and connected to one power supply area 16; the loop track formed by the heating unit 2 is arranged in asymmetry.

[0063] In this embodiment, the heating unit 2 is arranged in one-to-many with the power supply area 16, so as to uniformly control the heating state of the heating unit 2. The plurality of heating units 2 are arranged side by side, that is, the extension tracks of the plurality of heating units 2 are similar, compared with the regional arrangement of the plurality of heating units 2, so that the heating efficiency of the whole hot bed is greatly improved, and the heating speed of the hot bed is further improved.

[0064] In an embodiment of the present application, as shown in Figure 3 , the loop track formed by the heating unit 2 includes a first section 21, a second section 22 and a third section 23, the first section 21 surrounds the periphery of the cavity 13 and forms a first end and a second end arranged at intervals, the second section 22 and the third section 23 are connected to the first end and the second end respectively, and the second section 22 and the third section 23 are arranged in parallel to the middle of the cavity 13 and connected to the power supply area 16.

[0065] In the embodiment, the heating unit 2 is asymmetrically arranged, the first section 21 surrounds the periphery of the cavity 13 and is disconnected at a similar position to form a first end and a second end, the first section 21 and the second section 22 are connected to the first end and the second end respectively and are arranged to bend towards the middle region 14 of the cavity 13 relative to the first section 21, after extending to a certain distance towards the middle region 14, the first section 21 and the second section 22 are bent again towards the periphery and are connected to the power supply region 16 to form a complete loop.

[0066] Optionally, the first section 21 and the second section 22 can be arranged to extend along an S shape in the middle region 14 to increase the heating area of the heating unit 2 and improve the heating efficiency and the uniformity of heating.

[0067] It can be understood that the power supply region 16 in the embodiment is arranged in the peripheral region 15 and is arranged to bend towards the periphery after the first section 21 and the second section 22 extend in the middle region 14.

[0068] Optionally, when a plurality of heating units 2 are arranged side by side and are connected to the same heating region, the trajectories of the heating units 2 are also symmetrically arranged, which is not limited herein.

[0069] In an embodiment of the utility model, the heating module includes a first heating pipe and a second heating pipe, the extension directions of the first heating pipe and the second heating pipe are consistent, so that the first heating pipe and the second heating pipe can uniformly heat the shell and reduce the temperature difference of the shell.

[0070] Optionally, the radial dimensions of the first heating pipe and the second heating pipe are different, the heating capacity of the first heating pipe and the second heating pipe can be determined by the radial dimensions, the greater the radial dimension, the stronger the heating capacity of the heating pipe, and the smaller the radial dimension, the weaker the heating capacity of the heating pipe. The heating pipe with a large radial dimension is arranged in the region of the shell corresponding to the insufficient heating to compensate for the defect of insufficient heating in the region.

[0071] Optionally, the radial dimension of the first heating pipe is greater than that of the second heating pipe, the first heating pipe is arranged at the edge position of the shell, and the first heating pipe is arranged at the middle position of the shell, the arrangement of the first heating pipe at the edge position of the shell can improve the heating efficiency of the edge position and avoid the problem of insufficient temperature at the edge of the hot bed, which causes the printed part to be warped and seriously affects the printing quality.

[0072] Optionally, the first heating pipe and the second heating pipe are independently heated, the first heating pipe is arranged at an edge position of the shell, and the second heating pipe is arranged at a middle position of the shell 1. When the printing model is small, it only covers the middle position of the shell 1, and only the second heating pipe is heated, and when the printing model is large, the first heating pipe and the second heating pipe are synchronously heated.

[0073] In an embodiment of the present application, as shown in Figure 2 The heating module further comprises a heat-conducting member and an elastic member, the cavity 13 is provided with a limiting member, the limiting member is used for limiting the heating unit 2, the heat-conducting member is arranged between the heating unit and the shell, the elastic member has opposite first and second ends, the first end is fixed to the cavity wall of the cavity 13 or the limiting member, and the second end elastically abuts against the heating unit 2.

[0074] In the embodiment, the heat-conducting member is further arranged between the heating unit 2 and the shell 1, the heat-conducting member can quickly transfer the heat released by the heating unit 2 to the shell 1, so as to accelerate the heat conduction speed of the heating unit 2, and further improve the heating speed of the hot bed. Optionally, the heat-conducting member can also be filled in the cavity 13, so as to improve the uniformity of heat transfer. The heat-conducting member can be heat-conducting silica gel, heat-conducting graphite or heat-conducting gasket and the like.

[0075] Optionally, the heating unit 2 is a heating pipe, which has good bending performance, so as to be arranged along different trajectories. The heating unit 2 can also be a heating wire.

[0076] In the embodiment, the heating unit 2 is fixed by the limiting member. It can be understood that the cavity 12 has oppositely arranged top and bottom walls, and the limiting member can be arranged on the top wall or the bottom wall to fix the heating unit 2. Generally, the heating unit 2 is fixed on the top wall by the limiting member, so as to heat the printing panel on the side of the top wall away from the bottom wall. The limiting member can be a clamp structure, or two limiting plates arranged oppositely, and the heating unit 2 is limited between the two limiting plates.

[0077] It can be understood that the first end of the elastic member is fixed on the cavity wall of the cavity 13 or the limiting member, and the second end abuts against the heating unit 2. When the heating unit 2 is heated to expand, the elastic member will be deformed to offset the deformation of the heating unit 2, so as to ensure that the shell 1 will not be deformed, which is beneficial to ensure the flatness of the shell 1 and the printing panel, and is also beneficial to limit the heating unit 2. Optionally, the heating unit 2 is generally arranged in abutment with the top wall of the cavity to ensure the heating effect on the printing panel. Optionally, the heating unit 2 is in abutment with the top wall of the cavity, the first end of the elastic member is connected with the bottom wall, and the second end is in abutment with the heating unit 2. When the heating unit 2 expands, the elastic member will be compressed; optionally, the heating unit 2 is in abutment with the top wall of the cavity, the first end of the elastic member is connected with the top wall or the limiting member arranged on the top wall, and the second end is in abutment with the heating unit 2. When the heating unit 2 expands, the elastic member will be stretched. In this way, the elastic member can not only offset the expansion of the heating unit 2, but also fix the heating unit 2 in place.

[0078] In an embodiment of the present application, as shown in Figure 1 and Figure 2 The shell 1 comprises an upper shell 11 and a lower shell 12. The upper shell 11 is used for bearing the printing panel, and the upper shell 11 and the lower shell 12 form a cavity 13. The upper shell 11 is provided with a limiting groove and a plurality of reinforcing ribs. The heating unit 2 is limited in the limiting groove, and the plurality of reinforcing ribs are arranged away from the limiting groove.

[0079] In the embodiment, the heating unit 2 is arranged in close contact with the groove wall of the limiting groove, so as to increase the contact area with the upper shell 11. The upper shell 11 is used for bearing the printing panel, so as to improve the heating efficiency on the printing panel and improve the uniformity of heating on the printing panel. The lower shell 12 covers the slot opening of the limiting groove to achieve the effect of packaging.

[0080] It can be understood that the setting track of the limiting groove is consistent with the preset extension track of the limiting groove. The limiting groove is beneficial to the positioning and installation of the heating unit 2. The heating unit 2 is limited in the limiting groove of the upper shell 11, so as to avoid displacement of the heating unit 2 in the cavity 13 and affect the heating effect.

[0081] The reinforcing ribs can be arranged at the position of the limiting groove of the upper shell 11 to improve the strength of the upper shell 11. The upper shell 11 is not easy to deform, so as to ensure the flatness of the upper shell 11 and the printing panel and ensure the forming quality of the printing piece.

[0082] Optionally, the upper shell 11 and the lower shell 12 are connected by a detachable connection mode such as screws or buckles. The lower shell 12 and the upper shell 11 corresponding to the power supply module 3 are provided with a limiting structure for limiting the power supply module 3 to ensure the stability of the power supply module 3 in the cavity 13. In actual implementation, the hot bed needs to be installed on the guide rail, and the side of the lower shell 12 away from the upper shell 11 can be provided with a support for installation on the guide rail. The lower shell 12 can also be provided with a heat insulation layer to slow down the heat dissipation speed of the hot bed and improve the heating efficiency of the hot bed.

[0083] The utility model also proposes a kind of 3D printer, and the 3D printer includes printing panel and hot bed, and the specific structure of the hot bed refers to above-mentioned embodiment, since the present 3D printer has adopted all technical solutions of above-mentioned embodiment, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration. Wherein, printing panel is detachably installed in hot bed, such as through the way of magnetic attraction or the way of clamping structure clamping installation in hot bed.

[0084] The above-mentioned is only the exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and all equivalent structural transformations made by the utility model specification and attached drawing contents, or direct / indirect application in other related technical fields under the technical concept of the utility model are included in the patent protection range of the utility model.

Claims

1. A heated bed for use in a 3D printer, characterized in that, The heated bed includes: A housing having a cavity within which a power supply area is formed, the power supply area being offset from the center of the cavity, the housing serving to support a printing panel; and The heating module includes multiple heating units, each of which is connected to the power supply area at both ends, and the heating units form a ring structure.

2. The heated bed as described in claim 1, characterized in that, The cavity has a central region and a peripheral region surrounding the central region, and the power supply region is located within the peripheral region; The heated bed also includes a power supply module, which is located in the power supply area and is adapted to supply power to the heating unit.

3. The heated bed as described in claim 2, characterized in that, The power supply area includes multiple power supply modules, and each power supply module is located in one of the power supply areas. Each heating unit is connected to a power supply module at both ends.

4. The heated bed as described in claim 2, characterized in that, The power supply module includes a power supply, a switch, a temperature sensor, and a control unit. The power supply and the switch are adapted to be connected in series with the heating unit. The control unit is electrically connected to the switch and the temperature sensor. The temperature sensor is used to detect the temperature information of the heating unit. The control unit controls the state of the switch according to the temperature information.

5. The heated bed as described in claim 1, characterized in that, The power supply area includes multiple areas, and each heating unit is connected to one of the power supply areas to form a circuit. The multiple circuits formed by the multiple heating units are nested. Alternatively, the power supply area may be a single area, with multiple heating units arranged side by side and connected to the power supply area, and the heating units forming a circuit trajectory arranged asymmetrically.

6. The heated bed as described in claim 5, characterized in that, The heating unit forms a loop trajectory including a first segment, a second segment, and a third segment. The first segment surrounds the periphery of the cavity and forms a first end and a second end that are spaced apart. The second segment and the third segment are respectively connected to the first end and the second end. The second segment and the third segment extend in parallel toward the middle of the cavity and are connected to the power supply area.

7. The heated bed according to any one of claims 1 to 6, characterized in that, The heating module includes a first heating element and a second heating element. The first heating tube and the second heating tube extend in the same direction; or, the first heating tube and the second heating tube have different radial dimensions; or, the radial dimension of the first heating tube is greater than that of the second heating tube, the first heating tube is arranged at the edge of the housing, the first heating tube is arranged at the middle of the housing; or, the first heating tube and the second heating tube heat independently, the first heating tube is arranged at the edge of the housing, and the second heating tube is arranged at the middle of the housing.

8. The heated bed according to any one of claims 1 to 6, characterized in that, The heating module further includes a heat-conducting component and an elastic component. A limiting component is provided inside the cavity to limit the heating unit. The heat-conducting component is disposed between the heating unit and the housing. The elastic component has a first end and a second end. The first end is fixed to the cavity wall of the cavity or the limiting component, and the second end elastically abuts against the heating unit.

9. The heated bed according to any one of claims 1 to 6, characterized in that, The housing includes an upper shell and a lower shell, the upper shell being used to support the printing panel, and the upper shell and the lower shell forming the cavity; The upper shell is provided with a limiting groove and multiple reinforcing ribs. The heating unit is limited within the limiting groove, and the multiple reinforcing ribs are arranged to avoid the limiting groove.

10. A 3D printer, characterized in that, The 3D printer includes a printing panel and a heated bed as claimed in any one of claims 1 to 9, wherein the printing panel is detachably mounted on the heated bed.

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