A heating platform for a 3D printer based on graphite interlayer

Abstract

The utility model discloses a kind of heating platform for 3D printer based on graphite interlayer, from top to bottom sequentially include panel, graphite plate and silica gel heating sheet;Silica gel heating sheet includes base layer, and heating piece is embedded in base layer;Heating piece is the resistance wire of multiple groups of serpentine winding, and silica gel heating sheet is provided with multiple groups of resistance wire and is wound into multiple horizontal distribution heating area;Graphite plate interlayer can meet the rigid need of heating platform, and at the same time, platform warping caused by thermal expansion and cold shrinkage can be avoided, the first layer adhesion stability is improved, platform flatness is kept long-term, simultaneously light in weight, heat transfer is faster, can be instantaneously evenly spread, avoid printing piece warping, cracking caused by local supercooling or overheating, can greatly shorten preheating time, improve printing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of 3D printers, and in particular to a heating platform for 3D printers based on graphite sandwich layers. Background Technology

[0002] In fused deposition modeling (FDM / FFF) 3D printing technology, the heating platform is a key component for ensuring the adhesion quality of the first layer of the printed model, preventing warping, and improving the forming accuracy. Currently, most mainstream heated beds on the market use aluminum substrates as the heating carrier, combined with external heating films or resistance wires to achieve temperature control.

[0003] For example, patent CN207105623U discloses an integrated heating platform for a 3D printer, which adopts a three-layer structure of a chemically tempered glass layer, a high thermal conductivity adhesive layer, and an aluminum substrate heated bed.

[0004] However, aluminum-based heated beds have many inherent drawbacks in practical applications, severely restricting the printing quality, efficiency, and reliability of 3D printers. First, aluminum has a high coefficient of thermal expansion, making it prone to warping and permanent deformation during repeated heating and cooling cycles. This leads to decreased platform flatness and affects the consistency of the first layer adhesion, especially noticeable when printing materials with high shrinkage rates such as ABS and PEEK. Second, the aluminum substrate is heavy, increasing the inertia of the moving platform, limiting printing speed, and easily causing motion defects such as vibration lines and ghosting. For example, while CN217803330U attempts to save energy through zoned heating, it does not fundamentally solve the dynamic stability problem caused by weight. Third, although aluminum has better thermal conductivity than most metals, significant temperature unevenness still exists on large-size platforms, with a temperature difference of 5–15°C between the center and edges, causing localized warping and uneven adhesion of printed parts. Furthermore, aluminum is prone to creep and oxidation under long-term high-temperature environments, with a service life generally less than 2000 hours, making it difficult to meet the requirements of industrial-grade continuous printing and compatibility with high-temperature materials.

[0005] To overcome the aforementioned problems, the industry has seen the emergence of graphene heating element-based heated bed solutions, such as the one proposed in CN219523064U, which utilize graphene's high thermal conductivity and temperature uniformity to improve energy efficiency. However, graphene is costly, difficult to produce, and, since it is not used as a rigid support material, it is susceptible to environmental interference and oxidation, affecting its stability and requiring special protective measures. In reality, graphene remains largely theoretical in the heated bed field. Furthermore, even with localized structural optimization, the comprehensive shortcomings of aluminum-based materials in terms of dimensional stability, weight, high-temperature resistance, corrosion resistance, and energy consumption have not been systematically addressed. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a heating platform for 3D printers based on graphite sandwich, which is lightweight, has high dimensional stability, fast heating, and strong anti-warping ability.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a heating platform for a 3D printer based on a graphite sandwich layer, comprising, from top to bottom, a magnetic sheet, a graphite plate, and a silicone heating sheet; the silicone heating sheet includes a base layer, in which heating elements are embedded; the heating elements are arranged to form multiple horizontally distributed heating zones, and the area of ​​the silicone heating sheet is smaller than that of the graphite plate, so that a blank area is formed on the side of the graphite plate close to the silicone heating sheet; a grounding wire and an external wiring group connected to the printer body are led out from the silicone heating sheet, and the grounding wire is connected to the blank area.

[0008] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the magnetic sheet is provided with a chip removal notch, and the graphite plate is exposed from the chip removal notch.

[0009] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the external wiring group is connected in series with a thermistor and an over-temperature switch, and the thermistor is attached to the outer surface of the silicone heating sheet and is covered by a cover sheet.

[0010] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the heating element is a multi-group serpentine winding resistance wire, and the silicone heating sheet is provided with a heating zone formed by multiple groups of the resistance wire.

[0011] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is: it is rectangular in shape and has a longitudinal mounting hole at each of the four corners.

[0012] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the heating zone includes five heating zones; the first heating zone is horizontally arranged in the first vertical side area, and the second heating zone is horizontally arranged in the second vertical side area; the third heating zone, the fourth heating zone and the fifth heating zone are all arranged in the middle vertical area, wherein the third heating zone is vertically arranged in the first horizontal side of the middle position, and the fourth heating zone and the fifth heating zone are vertically arranged side by side in the second horizontal side of the middle position.

[0013] Another technical solution adopted by this utility model to solve the above-mentioned technical problems is: a heating platform for a 3D printer based on a graphite sandwich layer, which includes a panel, a graphite plate and a silicone heating sheet from top to bottom; the silicone heating sheet includes a base layer, and a heating element is embedded in the base layer; the heating element is a multi-set of serpentine winding resistance wires, and the silicone heating sheet is provided with a heating zone formed by a multi-set of the resistance wires.

[0014] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is that the panel is a magnetic sheet.

[0015] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the silicone heating sheet leads out a grounding wire and an external wiring group connected to the printer body; the external wiring group is connected in series with a thermistor and an over-temperature switch, and the thermistor is attached to the outer surface of the silicone heating sheet; the area of ​​the silicone heating sheet is smaller than that of the graphite plate, so that a blank area is formed on the side of the graphite plate close to the silicone heating sheet, and the grounding wire is connected to the blank area.

[0016] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the magnetic sheet is provided with a chip removal notch, and the graphite plate is exposed from the chip removal notch.

[0017] Compared with existing technologies, the advantages of this invention are: the graphite plate interlayer can meet the rigidity requirements of the heating platform. Compared with traditional aluminum-based heating platforms, graphite plates have an extremely low coefficient of thermal expansion, far lower than aluminum, and hardly deform during heating. Therefore, it can avoid platform warping caused by thermal expansion and contraction, improve the stability of the first layer adhesion, reduce printing failures, and maintain platform flatness over a long period. It is particularly suitable for large-size platforms, avoiding edge sinking or center bulging problems. In addition, graphite is 20-35% lighter than aluminum of the same volume, which can reduce the Z-axis load, extend the life of the motor and lead screw, improve the long-term stability of large-size printers, and significantly reduce motion inertia. Compared with aluminum, graphite plates transfer heat faster and can diffuse it instantly and evenly, thus avoiding warping and cracking of printed parts caused by local overcooling or overheating, significantly shortening preheating time and improving printing efficiency. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 A schematic diagram of a heating platform for a graphite sandwich-based 3D printer. Figure 1 ;

[0020] Figure 2 A schematic diagram of a heating platform for a graphite sandwich-based 3D printer. Figure 2 ;

[0021] Figure 3A schematic diagram of a heating platform for a graphite sandwich-based 3D printer. Figure 3 ;

[0022] Figure 4 An exploded view of a heating platform for a 3D printer based on graphite sandwich panels;

[0023] Figure 5 This is a circuit diagram of a heating platform for a 3D printer based on graphite sandwich. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0025] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the die-cast part of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0027] like Figure 1-5 As shown, this embodiment provides a heating platform for a 3D printer based on a graphite sandwich structure, comprising, from top to bottom, a panel 1, a graphite plate 2, and a silicone heating sheet 3; the silicone heating sheet 3 includes a base layer, within which a heating element is embedded. Preferably, the heating element is a plurality of sets of serpentine winding resistance wires 4, and the silicone heating sheet 3 has multiple horizontally distributed heating zones formed by the plurality of sets of resistance wires 4.

[0028] It should be noted that graphite plate 2 meets the rigidity requirements of the heating platform. Compared with traditional aluminum-based heating platforms, graphite plate 2 has an extremely low coefficient of thermal expansion, far lower than that of aluminum, and hardly deforms during heating. Therefore, it can avoid platform warping caused by thermal expansion and contraction, improve the stability of the first layer adhesion, reduce printing failures, and maintain platform flatness over a long period of time. It is particularly suitable for large-size platforms, avoiding edge sagging or center bulging problems.

[0029] Furthermore, graphite is 20–35% lighter than aluminum of the same volume, which reduces the load on the Z-axis, extends the life of the motor and lead screw, improves the long-term stability of large-format printers, and significantly reduces motion inertia. Compared to aluminum, graphite plate 2 transfers heat faster and can diffuse it evenly and instantly, thus avoiding warping and cracking of printed parts caused by localized overcooling or overheating, significantly shortening preheating time and improving printing efficiency.

[0030] In this embodiment, a silicone heating element 3 is used instead of a PCB heating element. Its base layer is prepared by coating a glass fiber board with silicone rubber, and the heating element is embedded within it. The serpentine winding of the resistance wire 4 is a mature and efficient heating element layout method, which allows the resistance wire 4 to be evenly distributed throughout the heating area, avoiding obvious hot and cold stripes and laying a good foundation for zoned temperature control. Alternatively, an etched heating element can also be used. The soft silicone base layer provides good protection for the heating element, exhibiting strong shock resistance and bending resistance.

[0031] Preferably, such as Figure 1-4 As shown, panel 1 is a magnetic sheet that can directly attach to the flexible printing panel 1, enabling quick assembly and disassembly of the platform and printer body, which is more conducive to users' personalized choices.

[0032] Preferably, the heating platform for the graphite-based 3D printer is rectangular with a longitudinal mounting hole 5 at each of the four corners, facilitating the use of screws or other fasteners to securely and evenly mount the entire heating platform module onto the printer's Y-axis carriage or bracket, preventing shaking during printing.

[0033] like Figure 1 As shown, the area of ​​the silicone heating pad 3 is smaller than that of the graphite plate 2, so that a blank area 6 is formed on the side of the graphite plate 2 that is close to the silicone heating pad 3; the silicone heating pad 3 extends outward with a grounding wire 7 and an external wiring group 8 connected to the printer body, and the grounding wire 7 is connected to the blank area 6.

[0034] By directly connecting the grounding wire 7 to the blank area 6 of the graphite plate 2, a reliable, low-resistance grounding path is provided for the entire heating platform. Graphite is a good conductor and can effectively conduct away the static charge generated by material friction during printing, preventing static electricity buildup from damaging the printer's precision electronic components or affecting print quality.

[0035] like Figure 1 As shown, an OT terminal 9 is provided at the end of the grounding wire 7, which makes grounding connection easier.

[0036] like Figure 1 , 4As shown, the magnetic sheet has a chip removal notch 10, through which the graphite plate 2 protrudes. During the 3D printing process, residual printing material often flows onto the nozzle. The chip removal notch 10 allows the nozzle to move downwards towards the chip removal notch 10 before printing begins, so that the residual printing material comes into contact with the graphite plate 2, thereby achieving a frictional cleaning effect.

[0037] like Figure 5 As shown, the heating circuit leading from the heating element connects the thermistor 11 and the over-temperature switch, and further connects to the external wiring group 8 in series, that is, the external wiring group 8 connects the thermistor 11 and the over-temperature switch in series. As shown in the figure, the external wiring group 8 integrates a wire harness through the network tube 18.

[0038] Preferably, such as Figure 1 , 4 As shown in Figure 5, the thermistor 11 is attached to the outer surface of the silicone heating pad 3 and is shielded by the cover plate 12. Furthermore, the heating element lead-out position is also shielded by the cover plate 12. It should be noted that the thermistor 11, being in close contact with the heating pad, can accurately and quickly monitor its actual temperature and feed the signal back to the printer's mainboard, achieving precise PID temperature control and ensuring the platform temperature remains stable at the set value. The series-connected overheat switch can physically cut off the heating circuit when the heating pad abnormally overheats, preventing the temperature from continuing to rise and causing a fire or equipment damage, greatly improving product safety.

[0039] like Figure 5 As shown, the heating zone includes five heating zones; the first heating zone 13 is horizontally arranged in the first vertical side area, and the second heating zone 14 is horizontally arranged in the second vertical side area; the third heating zone 15, the fourth heating zone 16 and the fifth heating zone 17 are all arranged in the middle vertical area, wherein the third heating zone is vertically arranged in the first horizontal side in the middle position, and the fourth heating zone and the fifth heating zone are arranged vertically side by side in the second horizontal side in the middle position.

[0040] The platform is divided into five independently controlled zones, allowing the printer to selectively heat specific areas based on the actual coverage area of ​​the model during the first layer of printing. When printing small objects, only the local heating zone below the model can be activated, rather than the entire platform, effectively saving energy. Simultaneously, this layout better compensates for the faster heat loss at the platform edges, achieving more uniform global temperature distribution than a single heating zone by independently adjusting the power of the edge and center areas.

[0041] This article uses specific examples to describe a heating platform for a 3D printer based on a graphite sandwich structure provided by this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A heating platform for a 3D printer based on a graphite sandwich, characterized in that... The components, from top to bottom, include a magnetic sheet, a graphite plate, and a silicone heating sheet. The silicone heating sheet includes a base layer with a heating element embedded within it. The heating element is arranged to form multiple horizontally distributed heating zones. The area of ​​the silicone heating sheet is smaller than that of the graphite plate, so that a blank area is formed on the side of the graphite plate closest to the silicone heating sheet. A grounding wire and an external wiring group connected to the printer body are led out from the silicone heating sheet, and the grounding wire is connected to the blank area.

2. The heating platform for a 3D printer based on a graphite sandwich structure according to claim 1, characterized in that... The magnetic sheet has a chip removal notch, and the graphite plate is exposed through the chip removal notch.

3. The heating platform for a 3D printer based on a graphite sandwich structure according to claim 1, characterized in that... The external wiring group is connected in series with a thermistor and an over-temperature switch. The thermistor is attached to the outer surface of the silicone heating pad and is covered by a sheet.

4. The heating platform for a 3D printer based on a graphite sandwich structure according to claim 1, characterized in that... The heating element is a resistance wire with multiple sets of serpentine windings, and the silicone heating sheet has a heating zone formed by multiple sets of the resistance wires.

5. A heating platform for a 3D printer based on a graphite sandwich structure according to claim 1, characterized in that... It is rectangular in shape and has a vertical mounting hole at each of the four corners.

6. A heating platform for a 3D printer based on a graphite sandwich structure according to claim 4, characterized in that... The heating zone includes five heating zones; the first heating zone is horizontally arranged in the first vertical side area, and the second heating zone is horizontally arranged in the second vertical side area; the third, fourth, and fifth heating zones are all arranged in the middle vertical area, wherein the third heating zone is vertically arranged in the first horizontal side of the middle position, and the fourth and fifth heating zones are vertically arranged side by side in the second horizontal side of the middle position.

7. A heating platform for a 3D printer based on a graphite sandwich, characterized in that... From top to bottom, it includes a panel, a graphite plate, and a silicone heating sheet; the silicone heating sheet includes a base layer, and a heating element is embedded in the base layer; the heating element is a multi-set of serpentine winding resistance wires, and the silicone heating sheet has multiple sets of the resistance wires wound into multiple horizontally distributed heating zones.

8. A heating platform for a 3D printer based on a graphite sandwich structure according to claim 7, characterized in that... The panel is a magnetic sheet.

9. A heating platform for a 3D printer based on a graphite sandwich structure according to claim 7, characterized in that... The silicone heating element has a grounding wire and an external wiring group connected to the printer body; the external wiring group is connected in series with a thermistor and an over-temperature switch, and the thermistor is attached to the outer surface of the silicone heating element; the area of ​​the silicone heating element is smaller than that of the graphite plate, so that a blank area is formed on the side of the graphite plate close to the silicone heating element, and the grounding wire is connected to the blank area.

10. A heating platform for a 3D printer based on a graphite sandwich structure according to claim 8, characterized in that... The magnetic sheet has a chip removal notch, and the graphite plate is exposed through the chip removal notch.

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