阅读说明：本技术 用于光固化3d打印的树脂槽及三维打印装置 (Resin tank for photocuring 3D printing and three-dimensional printing device ) 是由 高翾 崔可建 周竞辉 顾伟 于 2019-03-22 设计创作，主要内容包括：本发明提供了一种用于光固化3D打印的树脂槽及三维打印装置。树脂槽包括槽体以及透明加热基板。透明加热基板设置于槽体的底部以形成用于容纳树脂的凹槽。其中,透明加热基板依次序包括透明层、加热层和封装层,加热层相比透明层更靠近凹槽且包括至少一层石墨烯,加载电压的石墨烯用以加热树脂,封装层用以保护石墨烯层。本发明的树脂槽的透明加热基板以面加热方式对树脂槽内树脂进行辐射加热,可显著降低槽内树脂粘度,提高3D打印制件的性能。(The invention provides a resin tank for photocuring 3D printing and a three-dimensional printing device. The resin tank comprises a tank body and a transparent heating substrate. The transparent heating substrate is arranged at the bottom of the tank body to form a groove for accommodating resin. The transparent heating substrate sequentially comprises a transparent layer, a heating layer and an encapsulation layer, the heating layer is closer to the groove than the transparent layer and comprises at least one layer of graphene, the voltage-loaded graphene is used for heating resin, and the encapsulation layer is used for protecting the graphene layer. According to the transparent heating substrate of the resin tank, the resin in the resin tank is subjected to radiation heating in a surface heating mode, so that the viscosity of the resin in the tank can be remarkably reduced, and the performance of a 3D printing product is improved.)

1. A resin tank for photocuring 3D printing, the resin tank comprising:

a trough body; and

the transparent heating substrate is arranged at the bottom of the tank body to form a groove for accommodating resin;

wherein, transparent heating base plate preface in proper order includes stratum lucidum, zone of heating and encapsulated layer, the zone of heating is compared the stratum lucidum is closer to the recess just includes an at least layer of graphite alkene, the loading voltage graphite alkene is used for heating the resin, the encapsulated layer is used for protecting an at least layer of graphite alkene.

2. The resin tank for photocuring 3D printing according to claim 1, further comprising a hollow bottom plate for fixing the transparent heating substrate to the bottom of the tank body;

the periphery of the hollow hole of the hollow bottom plate is provided with a sinking part for supporting the transparent heating substrate, and the sinking height of the sinking part is equal to the thickness of the transparent heating substrate.

3. The resin tank for photocuring 3D printing according to claim 1, wherein the number of graphene layers is 1-10.

4. The resin tank for photocuring 3D printing according to claim 3, wherein the number of graphene layers is 2-5.

5. The resin tank for photocuring 3D printing according to claim 1, wherein the heating layer has a sheet resistance of 200-5000 Ω/□.

6. The resin tank for photocuring 3D printing according to claim 5, wherein the heating layer has a sheet resistance of 1000-3000 Ω/□.

7. The resin tank for photocuring 3D printing according to claim 6, wherein the area resistance of the heating layer is 1500-2500 Ω/□.

8. The resin tank for photocuring 3D printing according to claim 1, wherein the transparent layer is made of any one of quartz glass, borax glass, boric acid glass, silicate glass, or soda-lime glass; or

The transparent layer is made of any one of polyesters, polyethers, polyamides, polyolefins or copolymer resins.

9. The resin tank for photocuring 3D printing of claim 1, wherein the transparent heated substrate further comprises interdigitated electrodes electrically connected to the at least one layer of graphene.

10. A three-dimensional printing apparatus comprising the resin tank for photocuring 3D printing according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of photocuring 3D printing in general, and particularly relates to a resin tank for photocuring 3D printing and a three-dimensional printing device.

Background

As an emerging rapid prototyping technology, 3D printing has received increasing attention due to its unique manufacturing advantages. The photocuring 3D printing technology has the advantages of high forming speed, high printing precision, low equipment cost and the like, and is widely applied to the fields of jewelry manufacturing, dental restoration, art design and the like. In the process of photocuring 3D printing, resin materials for molding are usually stored in a resin tank, and then are irradiated and cured layer by UV/visible light transmitted from the bottom of the resin tank, and are stacked layer by layer to finally form a complex three-dimensional structure. In order to realize high-quality and high-efficiency 3D printing, the photosensitive resin used needs to maintain certain fluidity so as to fill the layer gap between the printed product and the resin groove timely and fully. Normally, the addition of reactive diluents in resin formulation can be beneficial in reducing resin viscosity and improving flow, but the addition of diluents can reduce the performance of the final printed article to a greater or lesser extent, and thus the amount of diluent added is limited. And the viscosity of the resin is reduced by adopting a heating mode, so that the performance of a printed part is not influenced on the basis of increasing the fluidity of the resin.

At present, heating schemes of the resin tank are provided in the prior art, and the heating schemes all play roles in heating the resin in the tank and improving the flowability. However, in the prior art, the inner wall of the resin tank is heated by heating or by blowing hot air, which has the disadvantages of low heating efficiency, uneven heating of the resin, easy damage to the printed product, and the like.

The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a resin tank for photocuring 3D printing that is uniform in heat application and high in heating efficiency.

Another main object of the present invention is to overcome at least one of the drawbacks of the prior art described above, and to provide a three-dimensional printer equipped with the resin tank described above.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to an aspect of the present invention, there is provided a resin tank for photocuring 3D printing, the resin tank including a tank body and a transparent heating substrate. The transparent heating substrate is arranged at the bottom of the tank body to form a groove for accommodating resin; wherein, transparent heating base plate preface in proper order includes stratum lucidum, zone of heating and encapsulated layer, the zone of heating is compared the stratum lucidum is closer to the recess just includes an at least layer of graphite alkene, the loading voltage graphite alkene is used for heating the resin, the encapsulated layer is used for the protection graphite alkene layer.

According to an embodiment of the present invention, the heating device further comprises a hollow bottom plate for fixing the transparent heating substrate to the bottom of the tank body;

the periphery of the hollow hole of the hollow bottom plate is provided with a sinking part for supporting the transparent heating substrate, and the sinking height of the sinking part is equal to the thickness of the transparent heating substrate.

According to an embodiment of the present invention, the number of graphene layers is 1 to 10.

According to an embodiment of the present invention, the number of graphene layers is 2 to 5.

According to one embodiment of the present invention, the surface resistance of the heating layer is 200 to 5000 Ω/□.

According to one embodiment of the present invention, the surface resistance of the heating layer is 1000 to 3000 Ω/□.

According to one embodiment of the present invention, the area resistance of the heating layer is 1500-2500 Ω/□.

According to an embodiment of the present invention, the transparent layer is made of any one of quartz glass, borax glass, boric acid glass, silicate glass, or soda-lime glass; or

The transparent layer is made of any one of polyesters, polyethers, polyamides, polyolefins or copolymer resins.

According to an embodiment of the present invention, the transparent heating substrate further includes an interdigital electrode electrically connected to the at least one layer of graphene.

According to another aspect of the present invention, there is provided a three-dimensional printing apparatus including the resin tank as defined in any one of the above.

According to the technical scheme, the resin tank for photocuring 3D printing has the advantages and positive effects that:

according to the resin tank provided by the invention, the electrically heatable graphene is used, the graphene has high UV or visible light transmittance, and cannot influence irradiation curing in the forming process, and under a certain loading voltage, the transparent heating substrate performs radiation heating on resin in the resin tank in a surface heating mode, so that the viscosity of the resin in the tank can be obviously reduced, and the performance of a 3D printing product is improved. Meanwhile, the resin tank heated by the graphene has the advantages of high heating speed, high heating temperature, uniform heat supply, high heat utilization efficiency and the like.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is an exploded view of a resin tank for photocuring 3D printing shown according to an exemplary embodiment.

Fig. 2 is an assembly view illustrating a resin tank for photocuring 3D printing according to an exemplary embodiment.

Fig. 3 is a schematic view of a transparent heating substrate according to an exemplary embodiment.

Wherein the reference numerals are as follows:

1. trough body

11. Bottom part

12. Groove

2. Transparent heating substrate

21. Transparent layer

22. Heating layer

23. Encapsulation layer

3. Hollow bottom plate

31. Sinking part

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.;

fig. 1 is an exploded view of a resin tank for photocuring 3D printing shown according to an exemplary embodiment. Fig. 2 is an assembly view illustrating a resin tank for photocuring 3D printing according to an exemplary embodiment. Fig. 3 is a schematic view of a transparent heating substrate according to an exemplary embodiment.

The structure, connection mode and functional relationship of the main components of the resin tank for photocuring 3D printing according to the present invention will be described in detail with reference to the drawings.

Referring to fig. 1 to 3, the resin tank for photo-curing 3D printing according to the present invention includes a tank body 1, a transparent heating substrate 2, and a hollow bottom plate 3. The tank body 1 may be a rectangular shape having openings at the upper and lower sides, or may be other shapes such as a circle and a square, and the invention is not limited thereto. The transparent heating substrate 2 is disposed on the bottom 11 of the tank body 1 to form a groove 12 for accommodating a photosensitive resin, wherein the photosensitive resin may be an acrylate, an epoxy, or other suitable materials or combinations thereof. The transparent heating substrate 2 sequentially includes a transparent layer 21, a heating layer 22 and an encapsulation layer 23, the heating layer 22 is closer to the groove 12 than the transparent layer 21, the heating layer 22 is used to heat the photosensitive resin, and the encapsulation layer 23 is used to protect the heating layer 22. Heating layer 22 includes at least one layer of graphene, and the graphene applied with a certain voltage can generate heat to heat the photosensitive resin.

The transparent heating substrate 2 may be fixed to the bottom 11 of the tank body 1 through a sunken part 31 provided at the periphery of the hollow hole of the hollow bottom plate 3, for example, by screwing. As shown in fig. 2, when the tank body 1, the transparent heating substrate 2 and the hollow bottom plate 3 are assembled, the joint of the transparent heating substrate 2 and the sinking portion 31 is completely covered by the tank body 1, and the transparent heating substrate 2 is fixed by the cooperation of the three.

Of course, the transparent heating substrate 2 can also be directly fixed to the bottom 11 of the tank 1, for example, by screwing or the like.

Further, the depressed portion 31 of the hollow base plate 3 has a depressed height equal to the thickness of the transparent heating substrate 2, so that the upper surface of the transparent heating substrate 2 is flush with the upper surface of the hollow base plate 3 when the transparent heating substrate 2 is mounted on the depressed portion 31.

As mentioned above, in the present embodiment, the transparent layer 21 may be made of a glass plate, a polymer plate, or other materials that can transmit UV or visible light.

When the transparent layer 21 is a glass plate, it may be made of any one of quartz glass, borax glass, boric acid glass, silicate glass, soda-lime glass, and the like.

When the transparent layer 21 is a polymer sheet, it may be made of any one of polyesters, polyethers, polyamides, polyolefins, and copolymer resins.

In other embodiments, where heating layer 22 includes at least one layer of graphene, the graphene may be obtained by transferring from another substrate onto the transparent layer substrate, or may be obtained by growing graphene directly on the surface of the transparent layer.

The graphene layer can be multi-layered, for example, the number of graphene layers is 1-10 layers, preferably 2-5 layers, further preferably 2-3 layers, and the appropriate number of graphene layers can guarantee high light transmittance and electric heating effect.

Wherein the graphene layer has a UV light (355nm) transmittance of 50 to 100%, preferably 80 to 100%, and more preferably 90 to 100%.

Wherein the graphene layer has a visible light (455nm) transmittance of 50 to 100%, preferably 80 to 100%, and more preferably 90 to 100%.

The sheet resistance of the graphene layer is 200-5000 omega/□ (sheet resistance), preferably 1000-3000 omega/□, and more preferably 1500-2500 omega/□.

Further, in one embodiment, the sealing layer 23 for protecting the heating layer 22 may be made of a polymer film material, such as any one of polyesters, polyolefins, polyethers, polyamides, and co-polymers, and of course, an inorganic material film, such as any one of silica, titanium dioxide, etc., may be used.

Since the thinner the insulating layer is, the better the light transmittance is, and the thicker the insulating film is, the better the durability is, in order to achieve both the light transmittance and the durability, in the present embodiment, the thickness of the sealing layer 23 is 50 to 300 μm, preferably 50 to 200 μm, and more preferably 100 to 200 μm.

In general, when the resistance of the graphene layer is fixed, the higher the applied voltage, the higher the temperature that the electrothermal layer can raise, and the lower the safety, so the temperature raising efficiency and the safety are both considered, and the applied voltage should not be too high, and in the present embodiment, the direct applied voltage is 5 to 220V, preferably 36 to 220V, and more preferably 36 to 220V.

In addition, the transparent interdigital electrode of low resistance is set up to the accessible on graphite alkene layer to reduce the loading voltage of graphite alkene, can also further improve the electric heat effect of graphite alkene simultaneously.

For example, the low-resistance transparent interdigital electrode can be any one of a transparent metal oxide electrode (ITO, IWO, etc.), a metal grid (copper, silver, gold, etc.), a nano silver wire, etc., but is not limited thereto.

In the present embodiment, when the interdigital electrode is provided, the applied voltage may be 5 to 36V, preferably 5 to 24V, and more preferably 12 to 24V.

Under the working voltage, the resin can be stably heated to 60-150 ℃ by using the resin tank provided by the invention, and the temperature deviation is +/-10%.

The composition and heating effect of the transparent heating substrate 2 of the resin bath will be described in detail below with three specific embodiments.