Heated bed of 3D printer and 3D printer

Abstract

Disclosed in the present application are a heated bed of a 3D printer and the 3D printer. The heated bed is arranged on the side of a base of the 3D printer facing a nozzle of the 3D printer, and the heated bed is slidably connected to the base, wherein a first nozzle wiping device is arranged in the heated bed. By means of implementing the present application, the manual removal of residual consumables can be avoided, thereby effectively reducing the risk that a user is scalded when the residual consumables are wiped off of the nozzle.

Description

A hot bed device of a 3D printer and a 3D printer

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 24, 2023, with application number 202322315142.4 and application name “A hot bed device for a 3D printer and a 3D printer”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] A 3D printer (also known as a three-dimensional printer or stereo printer) is a type of rapid prototyping equipment. The 3D printing technology currently available for 3D printers is fused deposition modeling (FDM). FDM is a technology that constructs three-dimensional objects by printing layer by layer using materials such as powdered metal or plastic based on digital models. In specific implementations, a 3D printer using FDM technology uses a feeding device to supply hot-melt filament material (also known as consumables) to a nozzle, where the consumables are heated to a molten state. The nozzle can then extrude the molten consumables onto the print plate while moving along the printing path of the 3D printer, printing out a three-dimensional object layer by layer.

[0004] As a result, residual consumables remain around the nozzles. These residual consumables accumulate over time, causing them to adhere to the printed surface during printing, resulting in defects. Existing techniques heat the nozzle to soften the residual consumables, which are then removed manually. This results in inefficient removal of residual consumables around the nozzles and poses a risk of burns to the user.

[0005] Summary of the Invention

[0006] The present application proposes a hot bed device for a 3D printer and a 3D printer, which can improve the efficiency of removing residual consumables around a nozzle and have high safety.

[0007] In a first aspect, an embodiment of the present application provides a hot bed device for a 3D printer, wherein the hot bed device is disposed on a side of a base of the 3D printer facing a nozzle of the 3D printer, and the hot bed device is slidably connected to the base; wherein,

[0008] The hot bed device is provided with a first nozzle wiping device, which is used to wipe away residual consumables around the nozzle when the first nozzle wiping device comes into contact with the nozzle.

[0009] The embodiment of the present application adds a nozzle wiping device to the hot bed device, which can be used to wipe the residual consumables around the nozzle, avoiding manual removal of the residual consumables, effectively improving the efficiency of removing the residual consumables around the nozzle, and having high safety.

[0010] In conjunction with the first aspect, in a first possible implementation, the nozzle is conical in shape, and the first nozzle wiping device is used to wipe away residual consumables on the conical side surface of the nozzle. Implementing this embodiment of the application enables the first nozzle wiping device to clean the conical side surface of the nozzle, thereby improving the cleaning efficiency of the nozzle.

[0011] In combination with the first aspect or the first possible implementation of the first aspect, in a second possible implementation, the heated bed device further includes a power interface, and the first nozzle wiper device and the power interface are located on the same side of the heated bed device. By implementing this embodiment of the present application, only one side of the heated bed device needs to be processed during production, thereby improving production efficiency of the heated bed device and achieving a reasonable and aesthetically pleasing layout.

[0012] In combination with the first aspect or any of the above possible implementations of the first aspect, in a third possible implementation, the nozzle is conical in shape; the hot bed device is further provided with a second nozzle wiping device, which is configured to wipe away residual consumable material from the conical tip of the nozzle when in contact with the nozzle. Implementing this embodiment of the present application enables targeted wiping of the conical tip of the nozzle, improving the cleanliness of the printer nozzle during operation, thereby improving the efficiency of removing dirt from the printer nozzle.

[0013] In combination with the first aspect or any one of the above-mentioned possible implementations of the first aspect, in a fourth possible implementation, the hot bed device is further provided with a power interface and a second nozzle wiping device; wherein, the first nozzle wiping device, the second nozzle wiping device and the power interface are located on the same side of the hot bed device. Exemplarily, the second nozzle wiping device is provided between the first nozzle wiping device and the power interface. In the embodiment of the present application, the first nozzle wiping device and the second nozzle wiping device are located on the same side of the hot bed device. When wiping the nozzle, the nozzle can be moved in a specific direction to achieve two wiping operations. The movement path of the nozzle is short, and the wiping efficiency is high.

[0014] In combination with the first aspect or any one of the above-mentioned possible implementations of the first aspect, in a fifth possible implementation, the first nozzle wiping device includes a first base and a first wiping block; wherein the first wiping block is connected to the first base, and the first base is connected to the hot bed device. By implementing this embodiment of the present application, when the first nozzle wiping device is worn out, the first nozzle wiping device can be detachably replaced. Furthermore, when the first wiping block is worn out, the first wiping block can be replaced without replacing the first base, which is low-cost.

[0015] In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation, a surface of the first wiping block facing the nozzle is provided with a plurality of protrusions. In the embodiment of the present application, gaps are provided between the plurality of protrusions, and the nozzle rubs back and forth in the gaps between the protrusions, thereby wiping away any residual consumable material from the conical side portion of the nozzle.

[0016] In combination with the third possible implementation of the first aspect or in combination with the fourth possible implementation of the first aspect, in a seventh possible implementation, the second nozzle wiping device includes a second base and a second wiping block; wherein the second wiping block is connected to the second base, and the second base is connected to the hot bed device. By implementing this embodiment of the present application, when the second nozzle wiping device is worn out, the second nozzle wiping device can be detachably replaced. Furthermore, when the second wiping block is worn out, the second wiping block can be replaced without replacing the second base, which is low-cost.

[0017] In conjunction with the first aspect, in a first possible implementation, the second wiping block has a plurality of holes or serrations on a surface facing the nozzle. The nozzle rubs back and forth against the plurality of holes or serrations, thereby wiping away any residual consumable material from the conical tip of the nozzle. Implementing this embodiment of the present application can improve the efficiency of wiping the nozzle tip.

[0018] In combination with the seventh possible implementation of the first aspect or the eighth possible implementation of the first aspect, in a ninth possible implementation, the second wiping block is a metal sheet. Implementing this embodiment of the present application improves the durability of the second wiping block while ensuring efficient wiping of the nozzle tip. Furthermore, based on the specific heat capacity of metal, consumables remaining in the nozzle can be effectively solidified, further improving the wiping efficiency of the second wiping block on the nozzle.

[0019] In a second aspect, an embodiment of the present application provides a 3D printer, comprising a base, a nozzle, and a hot bed device described in combination with the first aspect or any one of the above possible implementations of the first aspect, wherein the hot bed device is arranged on a side of the base facing the nozzle, and the hot bed device is slidably connected to the base.

[0020] 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

[0021] FIG1 is a schematic diagram of an application scenario of a 3D printer provided in an embodiment of the present application;

[0022] FIG2 is a schematic structural diagram of a hot bed device provided in an embodiment of the present application;

[0023] FIG3 is another structural schematic diagram of a hot bed device provided in an embodiment of the present application;

[0024] FIG4 is a schematic structural diagram of a first mouth-wiping device provided in an embodiment of the present application;

[0025] FIG5 is an exploded view of a first mouth-wiping device provided in an embodiment of the present application;

[0026] FIG6 is a schematic structural diagram of a first wiping block provided in an embodiment of the present application;

[0027] FIG7 is another structural schematic diagram of a hot bed device provided in an embodiment of the present application;

[0028] FIG8 is a schematic structural diagram of a second mouth-wiping device provided in an embodiment of the present application;

[0029] FIG9 is an exploded view of a second mouth-wiping device provided in an embodiment of the present application;

[0030] FIG10 is a schematic structural diagram of a second wiping block provided in an embodiment of the present application;

[0031] FIG11 is another structural schematic diagram of a hot bed device provided in an embodiment of the present application;

[0032] FIG12 is another structural schematic diagram of the hot bed device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] 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.

[0034] Referring to Figure 1 , which is a schematic diagram of an application scenario of a 3D printer provided in an embodiment of the present application, as shown in Figure 1 , a 3D printer 102 is connected to a feeding device 101 .

[0035] The feeding device 101 can hold a material tray with consumables wound around it. The feeding device 101 can provide the consumables to the 3D printer 102, or the consumables can be rewound back onto the material tray through the feeding device. In other words, the feeding device can both feed and return material. For example, the feeding device 101 can also identify material information of the consumables and transmit the material information to the 3D printer 102.

[0036] The 3D printer 102 includes a print head 1021, which includes a material guide unit 10211, a nozzle 10212, and an extrusion assembly disposed between the material guide unit 10211 and the nozzle 10212. During material feeding from the feeding device 101, the consumable material passes through the material guide unit 10211 and then enters the extrusion assembly, which then delivers the consumable material to the nozzle 10212. During material withdrawal from the feeding device 101, the 3D printer 102 cuts the consumable material in the print head 1021, and the extrusion assembly delivers the consumable material to the feeding device 101.

[0037] Optionally, the 3D printer 102 may cut the consumable material between the extrusion assembly and the nozzle 10212 or may cut the consumable material in the extrusion assembly, etc. This application does not limit the position where the 3D printer cuts the consumable material.

[0038] Exemplarily, as shown in FIG1 , the 3D printer 102 further includes a print panel 1023, a heated bed device 1024, a base 1025a, and a slider 1029a. The heated bed device 1024 is located on the side of the base 1025a facing the nozzle 10212, and the heated bed device 1024 has a heating function. The print panel 1023 is located on the side of the heated bed device 1024 facing the nozzle 10212. The heat of the heated bed device 1024 can be transferred to the print panel 1023, and the nozzle 10212 can extrude the molten consumable material onto the print panel 1023. Optionally, the 3D printer 102 further includes a base 1025b and a slider 1029b. It is understood that the print panel 1023 can also be part of the heated bed device 1024. For example, the heated bed device 1024 can include a heated bed (not shown) and the print panel 1023. That is, the hot bed device in the present application may include a hot bed itself with a heating function, and may also include a hot bed and a printing panel located above the hot bed, which is not limited in the present application.

[0039] In a specific implementation, the 3D printer can adjust the temperature of the nozzle 10212 and the heated bed assembly 1024. The temperature of the nozzle 10212 is adjusted to heat the filament to a molten state, and the temperature of the heated bed assembly 1024 is adjusted to adhere the filament extruded from the nozzle 10212 to the printing panel 1023. The print head 1021 is slidably connected to the first guide rail 1026 and can move along the length of the first guide rail 1026, thereby achieving displacement of the print head 1021 relative to the printing panel 1023 along the length of the first guide rail 1026. The heated bed assembly 1024 is slidably connected to the second guide rail 1027 and can move along the length of the second guide rail 1027, thereby achieving displacement of the print head 1021 relative to the printing panel 1023 along the length of the second guide rail 1027. The length of the second guide rail 1027 is perpendicular to the length of the first guide rail 1026. Furthermore, the first guide rail 1026 is slidably connected to the third guide rail 1028. By moving the first guide rail 1026 along the third guide rail 1028, the 3D printer 102 can achieve displacement of the print head 1021 relative to the print panel 1023 in a direction perpendicular to the length of the second guide rail 1027 and in a direction perpendicular to the length of the first guide rail 1026. In other words, the 3D printer 102 can achieve three mutually perpendicular printing paths to print a three-dimensional object.

[0040] In an embodiment of the present application, a nozzle wiping device is added to the hot bed device of the 3D printer. The nozzle wiping device can be used to wipe the residual consumables around the nozzle, avoiding manual removal of the residual consumables, effectively improving the efficiency of removing the residual consumables around the nozzle, and having high safety.

[0041] The structure of the hot bed device will be described in detail below with reference to FIG. 2 to FIG. 12 .

[0042] See Figure 2, which illustrates the structure of a heated bed assembly according to an embodiment of the present application. As shown in Figure 2, heated bed assembly 204 includes a heated bed and a printing panel positioned above the heated bed. Hot bed assembly 204 includes at least a first nozzle wiping device 2041, which is configured to wipe away any residual consumable material surrounding the nozzle when in contact with the nozzle.

[0043] In some feasible embodiments, the nozzle is conical in shape, and the first nozzle wiping device 2041 can clean the residual consumables on the conical side of the nozzle. Implementation of the present application embodiment enables the first nozzle wiping device to clean the conical side of the nozzle, thereby improving the cleaning efficiency of the nozzle.

[0044] In some feasible embodiments, refer to Figure 3, which is another schematic diagram of the structure of a heated bed device provided in an embodiment of the present application. As shown in Figure 3, the heated bed device 204 is further provided with a power interface 2043, which can provide a source of heating energy for the heated bed device 204 to heat the heated bed device 204. The first nozzle wiper device 2041 and the power interface 2043 can be located on the same side of the heated bed device 204.

[0045] By implementing the embodiment of the present application, it is possible to achieve that only one side of the hot bed device 204 needs to be processed during production, thereby improving the production efficiency of the hot bed device 204 and making the layout reasonable and beautiful.

[0046] Exemplarily, the first nozzle wiping device 2041 can be pasted on the surface of the hot bed device 204, for example, specifically pasted near the top corner of the hot bed device 204. At this time, the first nozzle wiping device 2041 and the power interface 2043 are respectively located at the left and right top corners on the same side of the hot bed device 204.

[0047] Alternatively, in some feasible embodiments, referring to Figures 4 and 5 , Figure 4 is a schematic structural diagram of a first nozzle-wiping device provided in an embodiment of the present application, and Figure 5 is an exploded view of the first nozzle-wiping device provided in an embodiment of the present application. As shown in Figures 4 and 5 , the first nozzle-wiping device 2041 may include a first base 20411 and a first wiping block 20412. The first wiping block 20412 is connected to the first base 20411, which is in turn connected to the heated bed device 204. For example, the first base 20411 may be fixedly connected to the heated bed device using a connector such as screws.

[0048] For example, the first wiping block 20412 can be made of silicone, and the first base 20411 can be made of plastic. The first wiping block 20412 is the component that plays a role in wiping away the residual consumables around the nozzle. The first base 20411 and the first wiping block 20412 are detachably connected, for example, using a snap-fit ​​connection, so that the first wiping block 20412 can be replaced.

[0049] In some feasible embodiments, see FIG6 , which is a schematic diagram of the structure of the first wiping block provided in an embodiment of the present application. As shown in FIG6 , the surface of the first wiping block 20412 facing the nozzle is provided with a plurality of protrusions. There are gaps between the plurality of protrusions. For example, when the 3D printer is ready to print, the nozzle is heated so that the nozzle extrudes a portion of the consumable material. After the consumable material is extruded, the 3D printer can control the nozzle to move above the first wiping block 20412 and rub back and forth in the gaps between the protrusions to wipe away the residual consumable material around the nozzle.

[0050] The present application discloses a heated bed device for a 3D printer. The 3D printer includes a base, a nozzle, a guide rail, and the heated bed device. The heated bed device is disposed on a side of the base facing the nozzle and is slidably connected to the base via the guide rail. The heated bed device is provided with a first nozzle wiping device configured to wipe away residual consumables around the nozzle when in contact with the nozzle. Implementing the present application eliminates the need for manual removal of residual consumables, effectively reducing the risk of burns to the user when wiping residual consumables from the nozzle.

[0051] In some feasible implementations, referring to FIG7 , which is another structural diagram of a hot bed device provided in an embodiment of the present application, as shown in FIG7 , the hot bed device 304 is provided with a first nozzle wiping device 3041 and a second nozzle wiping device 3042 .

[0052] For example, as shown in combination with FIG. 11 and FIG. 12 , the heated bed device 304 may include a heated bed itself having a heating function.

[0053] In some feasible embodiments, the nozzle is conical in shape, and the first nozzle wiping device 3041 is used to wipe away any residual consumable material from the conical side of the nozzle when in contact with the nozzle; the second nozzle wiping device 3042 is used to wipe away any residual consumable material from the conical tip of the nozzle when in contact with the nozzle. In this case, the functions of the first and second nozzle wiping devices may differ. The specific implementation of the first nozzle wiping device 3041 can be referenced above with reference to the embodiments described in conjunction with Figures 2 to 6 and will not be further described here.

[0054] Optionally, in some feasible embodiments, the hot bed device 304 is further provided with a power interface 3043, wherein the first nozzle wiping device 3041, the second nozzle wiping device 3042, and the power interface 3043 are located on the same side of the hot bed device 304, and the second nozzle wiping device 3042 is located between the first nozzle wiping device 3041 and the power interface 3043, so that only one side of the hot bed device 304 needs to be processed during production, thereby improving the production efficiency of the hot bed device 304 and making the layout reasonable and beautiful. Furthermore, since the first nozzle wiping device 3041 and the second nozzle wiping device 3042 are located on the same side of the hot bed device 304, a large distance between the first nozzle wiping device 3041 and the second nozzle wiping device 3042 is avoided, and the nozzle can be wiped in multiple stages to improve wiping efficiency.

[0055] 7 takes the example of the second nozzle wiping device 3042 being disposed between the first nozzle wiping device 3041 and the power interface 3043. Optionally, the positions of the first nozzle wiping device 3041 and the second nozzle wiping device 3042 can be swapped.

[0056] In some feasible embodiments, the first nozzle wiping device 3041 and the second nozzle wiping device 3042 can be made of different materials. For example, the material of the first nozzle wiping device 3041 can be a heat-resistant and flexible material, and the material of the second nozzle wiping device 3042 can be a material with high heat conduction efficiency.

[0057] The nozzle can be provided with a heating module, and the controller of the 3D printer can pre-store first position coordinate parameters for the first nozzle wiping device 3041 and second position coordinate parameters for the second nozzle wiping device 3042. After the controller controls the heating module to heat the nozzle, the residual consumable material around the nozzle softens. The controller moves the print head to move the nozzle to the first nozzle wiping device 3041. When the nozzle contacts the first nozzle wiping device 3041, the controller controls the print head to move back and forth at the first nozzle wiping device 3041, and the nozzle can rub back and forth on the first wiping block of the first nozzle wiping device 3041 to complete the wiping of the conical side portion of the nozzle, thereby preparing the 3D printer for printing.

[0058] Similarly, the controller can move the print head to move the nozzle to the second nozzle wiping device 3042. When the nozzle contacts the second nozzle wiping device 3042, the nozzle can abut the second nozzle wiping device above the second nozzle wiping device 3042 to cool the nozzle and cool and solidify the consumables remaining on the printer nozzle. The controller controls the print head to move back and forth at the second nozzle wiping device 3042, so that the nozzle can rub back and forth above the second nozzle wiping device to wipe away the remaining consumables on the conical tip of the nozzle, thereby preparing for leveling the hot bed of the 3D printer.

[0059] Optionally, in some feasible implementation manners, the second nozzle wiping device 3042 and the first nozzle wiping device 3041 of the embodiment of the present application are only different in setting positions, and the functions of the first nozzle wiping device 3041 and the second nozzle wiping device 3042 can be the same.

[0060] In some feasible embodiments, referring to Figures 8 and 9, Figure 8 is a schematic structural diagram of a second nozzle wiping device provided in an embodiment of the present application, and Figure 9 is an exploded view of the second nozzle wiping device provided in an embodiment of the present application. As shown in Figures 8 and 9, the second nozzle wiping device 3042 may include a second base 30421 and a second wiping block 30422. The second wiping block 30422 is connected to the second base 30421, which is connected to the heated bed device 304. For example, the second base 30421 may be fixedly connected to the heated bed device 304 using a connector such as screws.

[0061] Exemplarily, the second wiping block 30422 can be made of metal, such as a stainless steel sheet, and the second base 30421 can be a plastic base. The second wiping block 30422 plays a vital role in wiping away residual consumables around the nozzle. The second base 30421 and the second wiping block 30422 are detachably connected, and the second wiping block 30422 is a consumable and replaceable component.

[0062] Furthermore, in some feasible embodiments, referring to FIG10 , FIG10 is a schematic diagram of the structure of the second wiping block provided in an embodiment of the present application. As shown in FIG10 , the second wiping block 30422 is provided with a wiping area on the surface facing the nozzle, and the wiping area can be provided with a plurality of holes or a plurality of serrations. Exemplarily, after the nozzle completes wiping the first nozzle wiping device, the 3D printer can control the nozzle to move above the second wiping block 30422 and rub back and forth in the wiping area. Based on the specific heat capacity characteristics of the metal, the consumables remaining in the nozzle can be effectively solidified. The multiple holes or multiple serrations in the wiping area can wipe clean the consumables solidified on the tip of the nozzle, further improving the wiping efficiency of the second wiping block on the nozzle.

[0063] The embodiment of the present application adds a first nozzle wiping device and a second nozzle wiping device, wherein the first nozzle wiping device is used to wipe away residual consumables on the sides of the nozzle, and the second nozzle wiping device is used to wipe away residual consumables at the tip of the nozzle contacting the hot bed. The first nozzle wiping device is used to clean the 3D printer, and the second nozzle wiping device is used to clean the 3D printer during the hot bed leveling phase. By implementing the embodiment of the present application, residual consumables around the nozzle can be effectively removed.

[0064] Of course, the above examples are only examples. It should be noted that the number of the first wiping nozzle device and the second wiping nozzle device may not be unique, and those skilled in the art can set the first wiping nozzle device and the second wiping nozzle device in any number according to actual needs; further, the materials used to make the first wiping nozzle device and the second wiping nozzle device may be different or the same, and those skilled in the art can use any material to make the first wiping nozzle device or the second wiping nozzle device according to actual needs; further, controlling the contact between the printer nozzle and the wiping nozzle device based on preset position coordinate parameters is not the only way, and those skilled in the art can use other ways to control the contact between the printer nozzle and the wiping nozzle device, for example, configuring a camera for the printer nozzle to control the contact between the printer nozzle and the wiping nozzle device after determining the position of the wiping nozzle device. The above is not limited to the embodiments of the present application.

[0065] The embodiment of the present application configures a first nozzle wiping device and a second nozzle wiping device for the nozzle of the hot bed device of the 3D printer, thereby avoiding manual wiping of the printer nozzle and improving the safety of the 3D printer during operation. At the same time, it can realize targeted wiping of different positions of the nozzle in multiple stages, thereby improving the cleanliness of the printer nozzle during operation, thereby improving the efficiency of dirt removal for the printer nozzle.

[0066] 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.

[0067] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A hot bed device for a 3D printer, characterized in that: The hot bed device is arranged on a side of the base of the 3D printer facing the nozzle of the 3D printer, and the hot bed device is slidably connected to the base; wherein, The hot bed device is provided with a first wiping nozzle device, and the first wiping nozzle device comprises a first wiping block, and the first wiping block is a silica gel wiping block.

2. The hot bed device according to claim 1, characterized in that: The shape of the nozzle is conical.

3. The hot bed device according to any one of claims 1 to 2, characterized in that: The heated bed device is also provided with a power interface, and the first nozzle wiping device and the power interface are located on the same side of the heated bed device.

4. The hot bed device according to any one of claims 1 to 3, characterized in that: The shape of the nozzle is conical; The hot bed device is also provided with a second nozzle wiping device.

5. The hot bed device according to any one of claims 1 to 4, characterized in that: The hot bed device is also provided with a power supply interface and a second nozzle wiping device; wherein, The first nozzle wiping device, the second nozzle wiping device and the power interface are located on the same side of the hot bed device.

6. The hot bed device according to claim 5, characterized in that: The second nozzle wiping device is arranged between the first nozzle wiping device and the power interface.

7. The hot bed device according to any one of claims 1 to 6, characterized in that: The first nozzle wiping device is adhered to the surface of the hot bed device.

8. The hot bed device according to claim 7, characterized in that: The first nozzle wiping device is adhered near the top corner of the hot bed device.

9. The hot bed device according to any one of claims 1 to 6, characterized in that: The first nozzle wiping device further comprises a first base, wherein the first wiping block is connected to the first base, and the first base is connected to the hot bed device.

10. The hot bed device according to any one of claims 1 to 9, characterized in that: A plurality of protrusions are arranged on a surface of the first wiping block facing the nozzle.

11. The hot bed device according to claim 10, characterized in that: There are gaps between the plurality of protrusions.

12. The hot bed device according to any one of claims 4 to 5, characterized in that: The second nozzle wiping device includes a second base and a second wiping block; wherein the second wiping block is connected to the second base, and the second base is connected to the hot bed device.

13. The hot bed device according to claim 12, characterized in that: A surface of the second wiping block facing the nozzle is provided with a plurality of holes or a plurality of saw teeth.

14. The hot bed device according to any one of claims 12 to 13, characterized in that: The second wiping block is a metal sheet.

15. A 3D printer, characterized in that: The 3D printer comprises a base, a nozzle and a heated bed device of the 3D printer according to any one of claims 1 to 14, wherein the heated bed device is arranged on a side of the base facing the nozzle, and the heated bed device is slidably connected to the base.

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