Heated bed of 3D printer, and 3D printer

Abstract

Disclosed in the present application are a heated bed of a 3D printer, and a 3D printer. The heated bed comprises a heated bed body, a heating unit and a bottom shell, wherein one end of the heating unit is configured to be connected to one end of a power supply, and the other end of the heating unit is configured to be connected to the other end of the power supply; the heating unit is arranged between the heated bed body and the bottom shell; and the heating unit is attached to the surface of the heated bed body close to the bottom shell and is configured to heat the heated bed body. Implementing the method of present application can improve the adhesion of a print bed and enhance printing quality.

Description

Hot bed of 3D printer and 3D printer

[0001] This application claims priority to the Chinese patent application with application number 202322959371X filed with the State Intellectual Property Office of China on November 1, 2023, and priority to the Chinese patent application with invention title “A hot bed of a 3D printer and a 3D printer”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of 3D printing, and in particular to a hot bed used for a 3D printer and a 3D printer. Background Art

[0003] 3D printing technology, also known as additive manufacturing technology, is a technology that uses digital model files as the basis, uses adhesive materials, and constructs printed parts by printing layer by layer.

[0004] During the 3D printing process, when the molten adhesive material extruded by the 3D printer's print head contacts the printing panel, the temperature of the printing panel is too low, and the printed part is affected by thermal expansion and contraction, which causes the printed part to easily warp, thereby affecting the printing quality.

[0005] Summary of the Invention

[0006] The present application provides a hot bed of a 3D printer and a 3D printer, which can improve printing quality.

[0007] In a first aspect, the present application provides a heated bed for a 3D printer, comprising a heated bed body, a heating unit, and a bottom shell. The heating unit has one end connected to one end of a power source, and the other end connected to the other end of the power source. The heating unit is disposed between the heated bed body and the bottom shell. The heating unit is attached to a surface of the heated bed body near the bottom shell and is configured to heat the heated bed body.

[0008] The hot bed in the present application is used to contact the printing panel, and the hot bed can be heated so that the hot bed can transfer heat to the printing panel through heat conduction, so that the printing panel carrying the printed part has a stable temperature, avoiding warping of the printed part, thereby improving the adhesion ability of the printing panel and improving the printing quality of the 3D printer.

[0009] In conjunction with the first aspect, in a first possible implementation, the heating unit is symmetrically arranged relative to the center of the heated bed. By implementing this application, the heating unit can uniformly heat the heated bed, ensuring uniform heating of the heated bed, thereby further ensuring uniform heating of all areas of the print panel in contact with the heated bed.

[0010] In combination with the first aspect or any of the above-described possible implementations of the first aspect, in a second possible implementation, the heated bed body is provided with a first receiving groove on a surface facing the bottom shell. The first receiving groove is used to accommodate the heating unit, thereby limiting relative displacement between the heated bed body and the heating unit and effectively ensuring the stability of the heating unit within the heated bed body. For example, the groove walls forming the first receiving groove can be integrally formed with the heated bed body. Positioning the heating unit within the first receiving groove can increase the contact area with the heated bed body, thereby improving the heating efficiency of the heated bed body by the heating unit.

[0011] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a third possible implementation, the first receiving groove is in a concave shape.

[0012] In combination with the first aspect or any of the foregoing possible implementations of the first aspect, in a fourth possible implementation, the heated bed further includes a switch connected in series with the heating unit at both ends of the power supply. In a specific implementation, the switch is configured to disconnect when the temperature of the heated bed exceeds a safe temperature, thereby protecting printed materials from damage due to excessive temperatures and improving the safety of the heated bed.

[0013] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a fifth possible implementation, the heated bed further includes a temperature sensor, which is attached to a surface of the heated bed body close to the bottom shell to sense the temperature of the heated bed body, thereby improving the efficiency of obtaining current temperature information of the heated bed.

[0014] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a sixth possible implementation, the hot bed body is provided with a fixing groove on a surface close to the bottom shell. The fixing groove is used to fix the connection between the temperature sensor and the hot bed body, thereby effectively ensuring the stability of the temperature sensor within the hot bed body and improving the reliability of the temperature sensor in sensing the temperature of the hot bed body.

[0015] In combination with the first aspect or any one of the above possible implementations of the first aspect, in a seventh possible implementation, the bottom shell is provided with a second receiving groove on a side away from the hot bed body; the hot bed further includes a bracket, which is provided in the second receiving groove, and the bracket is used to be installed on the base or screw of the 3D printer.

[0016] In combination with the first aspect or any of the above-mentioned possible implementations of the first aspect, in an eighth possible implementation, the heating unit includes a heat pipe or a resistance wire. Unlike a hot bed that uses an aluminum substrate as the heating source for the hot bed, the present application uses a heat pipe or a resistance wire to heat the hot bed body. The hot bed body of the present application can be a flat part made of a single material, which can avoid the problem of poor flatness caused by the mixing of aluminum and copper, two materials with different expansion coefficients, in the aluminum substrate. In addition, the cost of aluminum substrates is high. That is, implementing the present application can improve the flatness of the hot bed body while ensuring heating efficiency, and can also reduce production costs.

[0017] In combination with the first aspect or any one of the possible implementations of the first aspect, in a ninth possible implementation, a thermally conductive material is coated around the heat pipe. Exemplarily, the thermally conductive material may be silicone grease, which is used to increase the contact area between the heat pipe and the heat bed, thereby improving the heating efficiency of the heat pipe.

[0018] In combination with the first aspect or any of the above-mentioned possible implementations of the first aspect, in a tenth possible implementation, the heated bed further comprises a first set of magnets and a second set of magnets, wherein the magnetic force of the first set of magnets is greater than the magnetic force of the second set of magnets. The first set of magnets is located in a first region of the heated bed body, and the second set of magnets is located in a second region of the heated bed body; the second region is located within the first region. This application employs at least two sets of magnets disposed on the heated bed body to attach the print panel to the heated bed. The first and second sets of magnets have different magnetic forces and are located in different regions of the heated bed body, i.e., the second set of magnets with lower magnetic force is located within the first set of magnets with higher magnetic force. Unlike a heated bed that directly uses a single soft magnet with the same surface area as the heated bed to attach the print panel, this application optimizes the placement of the magnets on the heated bed body. By disposing magnets with higher magnetic force in the first region of the heated bed body and magnets with lower magnetic force in the second region of the heated bed body, the cost of the magnets can be reduced, thereby lowering the cost of the heated bed.

[0019] In a second aspect, the present application further provides a 3D printer, comprising a base and a heated bed as described in combination with the first aspect or in combination with any one of the possible implementations of the first aspect, wherein the heated bed is mounted on the base.

[0020] In a third aspect, the present application further provides a 3D printer, comprising a screw and a heated bed as described in combination with the first aspect or any one of the possible implementations of the first aspect, wherein the heated bed is mounted on the screw.

[0021] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the present application can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1A is a schematic structural diagram of a 3D printer provided in an embodiment of the present application;

[0023] FIG1B is another schematic structural diagram of a 3D printer provided in an embodiment of the present application;

[0024] FIG2 is a schematic structural diagram of a hot bed provided in an embodiment of the present application;

[0025] FIG3 is another structural schematic diagram of a hot bed provided in an embodiment of the present application;

[0026] FIG4 is a schematic diagram of the structure after being cut along line AA in FIG2 ;

[0027] FIG5 is an enlarged schematic diagram of the structure at point B in FIG4 . DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0029] In some feasible implementations, referring to FIG1A , FIG1A is a schematic diagram of a 3D printer provided in an embodiment of the present application. As shown in FIG1A , a 3D printer 300 includes a heated bed 310 , a print head 320 , a base 330 , and a printing panel 340 .

[0030] The heated bed 310 is located on the side of the base 330 facing the print head 320 and has a heating function. The print panel 340 is located on the side of the heated bed 310 facing the print head 320, and heat from the heated bed 310 can be transferred to the print panel 340. The heated bed 310 is mounted on the base 330. For example, the base 330 includes a guide rail that is slidably connected to the heated bed 310. Specifically, the guide rail is slidably connected to a bracket in the heated bed 310, allowing the heated bed 310 to move forward and backward along the guide rail.

[0031] The printing material is heated to a molten state in the printing head 320 , and the printing head 320 can extrude the molten printing material onto the printing panel 340 while moving along the printing path of the 3D printer 300 .

[0032] Alternatively, in some feasible embodiments, see FIG. 1B , which is another schematic diagram of the structure of a 3D printer provided in an embodiment of the present application. As shown in FIG. 1B , the 3D printer 20 includes a heated bed 201, a print panel 202, a print head 203, and a screw 204. Unlike the printer shown in FIG. 1A , the heated bed 201 in the printer 20 provided in an embodiment of the present application is mounted on a screw 204. Specifically, the screw 204 is connected to a bracket in the heated bed 201, and the heated bed 201 can move up and down along the screw 204.

[0033] Figures 1A and 1B show two 3D printers with different structures. 3D printers with different structures can have a heated bed with the same structure. The heated bed provided in this application is used to contact the printing panel, and the heated bed can be heated. Therefore, the heated bed can transfer heat to the printing panel through heat conduction, so that the printing panel carrying the printed part has a stable temperature, avoiding warping of the printed part, thereby improving the adhesion ability of the printing panel and improving the printing quality.

[0034] In some feasible implementations, the heated bed provided in this application may also be applicable to 3D printers with other structures, such as a cantilever structure, etc. That is, this application does not limit the structural type of the 3D printer to which the heated bed is specifically applied.

[0035] The structure of the hot bed is described in detail below with reference to FIG. 2 to FIG. 5 .

[0036] Please refer to Figures 2 to 5. Figure 2 is a structural schematic diagram of a hot bed provided in an embodiment of the present application. Figure 3 is another structural schematic diagram of a hot bed provided in an embodiment of the present application. Figure 4 is a structural schematic diagram after being cut along line AA in Figure 2. Figure 5 is an enlarged schematic diagram of the structure at point B in Figure 4.

[0037] The hot bed includes a hot bed body 101, which can be made of metal or plastic. The hot bed body 101 can be a solid plate, or a die-cast part, a stamped part, or an extruded part.

[0038] The heated bed further includes a bottom shell 102 , which is buckled on a side of the heated bed body 101 away from the print head, or the bottom shell 102 can be fixed on the side of the heated bed body 101 away from the print head by screws.

[0039] As shown in Figure 3, the heated bed further includes a heating unit 103, which can be positioned between the heated bed body 101 and the bottom shell 102. Furthermore, the heating unit 103 can be attached to the surface of the heated bed body 101 near the bottom shell. For example, the heating unit 103 can be press-fitted, screw-fastened, or secured to the first receiving slot via in-mold die-casting. This application does not limit the specific method of securing the heating unit to the first receiving slot.

[0040] In some feasible embodiments, the heating unit 103 includes a heat pipe or a resistance wire. Unlike a hot bed that uses an aluminum substrate as the heating source, the present application uses a heat pipe or a resistance wire to heat the hot bed body. The hot bed body of the present application can be a flat part made of a single material, which can avoid the problem of poor flatness caused by the mixing of aluminum and copper, two materials with different expansion coefficients, in the aluminum substrate. Furthermore, the cost of aluminum substrates is high. Therefore, the implementation of the present application can improve the flatness of the hot bed body while maintaining heating efficiency, and can also reduce production costs.

[0041] At this point, the heating unit 103 can be used to heat the heated bed body 101. Specifically, one end of the heating unit 103 can be connected to one end of a power supply, and the other end of the heating unit 103 can be connected to the other end of the power supply. The power supply provides electrical energy to the heating unit 103, which converts this electrical energy into thermal energy and transfers the thermal energy to the heated bed body 101 through heat conduction, thereby heating the heated bed body 101.

[0042] The hot bed in the present application is used to contact the printing panel, and the hot bed can be heated, so the hot bed can transfer heat to the printing panel through heat conduction, so that the printing panel carrying the printed part has a stable temperature, avoiding warping of the printed part, thereby improving the adhesion ability of the printing panel and improving the printing quality.

[0043] Optionally, a thermally conductive material is applied around the heat pipe. For example, the thermally conductive material is applied between the heat pipe and the heat bed. Alternatively, the surface of the heat pipe is covered with the thermally conductive material. In some feasible embodiments, the thermally conductive material may be thermally conductive silicone grease.

[0044] Optionally, the heating units 103 may be symmetrically arranged relative to the center of the hot bed body 101 so that each area of ​​the printing panel mounted on the hot bed can be heated evenly.

[0045] In an optional embodiment of the present application, a reinforcing rib structure is provided on the surface of the hot bed body 101 facing the bottom shell to ensure the rigidity of the hot bed body 101 .

[0046] Optionally, a first receiving groove may be provided on the surface of the hot bed body 101 facing the bottom shell, and the first receiving groove is used to place the heating unit 103 .

[0047] In order to heat the bearing surface of the heated bed body more evenly, in an optional embodiment of the present application, the first receiving groove can be concave in shape to ensure that the first receiving groove can pass through the edge position of the heated bed body 101 or the center position of the heated bed body 101.

[0048] Alternatively, the first receiving groove may also be in an "S" shape.

[0049] In some feasible embodiments, the density of the heating units 103 arranged along the heated bed body 101 can be increased to reduce the temperature difference between the heated bed bodies 101. That is, Figures 2 to 5 are merely exemplary illustrations of the arrangement of the heating units. In actual practice, the arrangement shape and density of the heating units can be varied.

[0050] Optionally, as shown in FIG4 , the reinforcing ribs may also be arranged according to the design position of the first receiving groove.

[0051] In some feasible implementations, the switch 104 may be provided on the surface of the heated bed body 101 facing the bottom shell, that is, the switch 104 and the heating unit 103 are located on the same side of the heated bed body 101 .

[0052] In a specific implementation, switch 104 and heating unit 103 are connected in series at both ends of a power supply. If the temperature of the hot bed body exceeds a safe temperature, switch 104 disconnects the electrical connection between heating unit 103 and the power supply. For example, the safe temperature can be the melting temperature of the printed material or the safe operating temperature of other hardware. Implementing this application can prevent excessive heat provided by heating unit 103 from damaging the printed material or causing overheating and damage to other hardware in the 3D printer, thereby improving the safety of the hot bed during operation and the printing efficiency of the 3D printer.

[0053] Optionally, the bottom shell 102 is provided with a heat insulation layer on the surface facing the base of the 3D printer. For example, the bottom shell 102 is covered with a plastic part, a heat insulation material or an air thermal resistor on the surface facing the base of the 3D printer.

[0054] Optionally, the insulation material may partially or completely cover the bottom of the bottom shell. To further improve the insulation efficiency of the insulation material, the embodiment of the present application may provide a cavity between the insulation material and the bottom shell, utilizing the principle of air thermal resistance to effectively improve the insulation efficiency of the insulation material.

[0055] In some feasible embodiments, the heated bed further includes a temperature sensor 105, which is attached to the surface of the heated bed body 101 near the bottom shell. This temperature sensor 105 is used to sense the temperature of the heated bed body 101. Exemplarily, this temperature sensor 105 is connected to a controller and transmits the sensed temperature of the heated bed body 101 to the controller. The controller can then control the on / off state of the switch 104 based on the relationship between the temperature of the heated bed body 101 and the safety temperature.

[0056] Optionally, the heated bed body 101 is provided with a fixing groove on the surface near the bottom shell, which can be used to fix the connection between the temperature sensor and the heated bed body. This limits the relative displacement between the heated bed body and the temperature sensor, effectively ensuring the stability of the temperature sensor within the heated bed body.

[0057] For example, the temperature sensor is a negative temperature coefficient sensor. In the embodiment of the present application, a negative temperature coefficient sensor (NTC) can be used as the temperature sensor to simplify the structural complexity of the heated bed while ensuring the temperature acquisition efficiency of the temperature sensor.

[0058] Optionally, the bottom shell 102 is provided with a second receiving groove on a side away from the hot bed body 101. In this case, the bracket in the hot bed can be provided in the second receiving groove, and the bracket can be used to be installed on the base or screw of the 3D printer.

[0059] In some feasible embodiments, the heated bed further comprises a first group of magnets and a second group of magnets, wherein the magnetic force of the first group of magnets is greater than the magnetic force of the second group of magnets. The first group of magnets is located in a first region of the heated bed body, and the second group of magnets is located in a second region of the heated bed body; the second region is located within the first region. The present application arranges at least two groups of magnets on the heated bed body to adsorb the print panel onto the heated bed. The first and second groups of magnets have different magnetic forces and are located in different regions of the heated bed body, i.e., the second group of magnets with smaller magnetic force is located within the first group of magnets with larger magnetic force. Unlike a heated bed that directly uses a single soft magnet with the same surface area as the heated bed to adsorb the print panel, the present application optimizes the arrangement of the magnets on the heated bed body. By arranging magnets with larger magnetic force in the first region of the heated bed body and magnets with smaller magnetic force in the second region of the heated bed body, the cost of using the magnets can be reduced, thereby reducing the cost of the heated bed.

[0060] In some feasible implementations, a leveling detection module is provided on the back side of the heated bed body.

[0061] In a specific implementation, the leveling detection module may be a leveling detection circuit board, and the leveling detection module may be used to participate in the level adjustment of the heated bed.

[0062] At the same time, since the hot bed body requires a high degree of flatness, in order to avoid the front structure of the hot bed body being too complicated, the leveling detection module can be configured on the back of the hot bed body, thereby ensuring that the hot bed is level while simplifying the front structure of the hot bed body.

[0063] For example, the front side of the hot bed body 101 may be configured with a printing panel for providing a bearing base, and the substrate material of the printing panel may be high borosilicate glass.

[0064] It should be noted that the above terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0065] [Corrected 04.11.2024 in accordance with Rule 26] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A hot bed of a 3D printer, characterized in that: The hot bed includes a hot bed body, a heating unit and a bottom shell; wherein, One end of the heating unit is used to connect to one end of a power source, and the other end of the heating unit is used to connect to the other end of the power source; The heating unit is arranged between the hot bed body and the bottom shell; wherein the heating unit is attached to the surface of the hot bed body close to the bottom shell, and the heating unit is used to heat the hot bed body.

2. The hot bed according to claim 1, characterized in that: The heating unit is symmetrically arranged relative to the center of the hot bed body.

3. The hot bed according to claim 1 or 2, characterized in that: The heated bed body is provided with a first receiving groove on a surface facing the bottom shell, and the first receiving groove is used for placing the heating unit.

4. The hot bed according to claim 3, characterized in that: The first receiving groove is in a concave shape.

5. The hot bed according to any one of claims 1 to 4, characterized in that: The heated bed further comprises a switch, wherein the switch and the heating unit are connected in series at both ends of the power supply; The switch is used to disconnect when the temperature of the hot bed body is higher than the safety temperature.

6. The hot bed according to any one of claims 1 to 5, characterized in that: The heated bed further comprises a temperature sensor, and the temperature sensor is attached to a surface of the heated bed body close to the bottom shell.

7. The hot bed according to claim 6, characterized in that: The hot bed body is provided with a fixing groove on a surface close to the bottom shell, and the fixing groove is used to fix the connection between the temperature sensor and the hot bed body.

8. The hot bed according to any one of claims 1 to 7, characterized in that: The bottom shell is provided with a second receiving groove on a side away from the hot bed body; The heated bed further comprises a bracket, which is arranged in the second receiving groove and is used for being installed on a base or a lead screw of the 3D printer.

9. The hot bed according to any one of claims 1 to 8, characterized in that: The heating unit includes a heat pipe or a resistance wire.

10. The hot bed according to claim 9, characterized in that: The heat pipe is coated with heat-conducting material around it.

11. The hot bed according to any one of claims 1 to 10, characterized in that: The heated bed further comprises a first group of magnets and a second group of magnets, wherein the magnetic force of the first group of magnets is greater than the magnetic force of the second group of magnets; Wherein, the first group of magnets is arranged in the first area of ​​the heating bed body, and the second group of magnets is arranged in the second area of ​​the heating bed body; the second area is located within the first area.

12. A 3D printer, characterized in that: The 3D printer comprises a base and a heated bed as claimed in any one of claims 1 to 11, wherein the heated bed is mounted on the base.

13. A 3D printer, characterized in that: The 3D printer comprises a lead screw and a heated bed as claimed in any one of claims 1 to 11, wherein the heated bed is mounted on the lead screw.

Images