CN219820653U

CN219820653U - 3D printing device

Info

Publication number: CN219820653U
Application number: CN202321008279.9U
Authority: CN
Inventors: 陈美宋; 陈美宇; 左妃弟; 陈美交
Original assignee: Shenzhen Heichuang Technology Co ltd
Current assignee: Shenzhen Heichuang Technology Co ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-10-13
Anticipated expiration: 2033-04-27

Abstract

The utility model discloses a 3D printing device, the 3D printing device comprises: a frame; the molding platform is used for receiving the printing material; light rays emitted by the light-emitting source are emitted to the forming platform; the movable assembly comprises a lifting mechanism arranged on the frame and a horizontal movement mechanism arranged on the frame, and the lifting mechanism is used for supporting and controlling the forming platform to lift; the coating assembly comprises a coating mechanism and a feeding mechanism, the coating mechanism is connected to the horizontal moving mechanism, and the horizontal moving mechanism supports and controls the coating mechanism to reciprocate above the forming platform so that the coating mechanism coats printing materials on the surface of the forming platform; the feeding mechanism is connected to the horizontal moving mechanism, is arranged on one side of the coating mechanism, and is matched with the coating mechanism and used for conveying printing materials to the coating mechanism. The technical scheme of the utility model can solve the problem that the existing 3D printer can start up for printing only by filling the material tank with the printing material, and can bring about resource waste.

Description

3D printing device

Technical Field

The utility model relates to the technical field of 3D printing, in particular to 3D printing equipment.

Background

The photo-curing 3D printer projects the cross section of the three-dimensional model on a workbench by utilizing light projection and an ultraviolet light source, so that the liquid photopolymer is photo-cured layer by layer, and the photo-curing 3D printer is divided into a pull-up type and a sinking type, wherein the most widely used photo-curing 3D printer is the sinking type at present.

The sinking type photo-curing 3D printer needs to fill the trough with printing materials before each printing, the printing materials are like photosensitive resin, the forming platform is soaked in the photosensitive resin, so that a large amount of resin can be filled for each time to print, the amount of the resin filled into the trough is determined by the forming size of the platform, no matter how large the printing model is, the trough needs to be filled first to print, and the larger the forming platform is, the more the photosensitive resin is needed, so that a lot of resource waste is brought, and the cost is high. After printing once, if the printing is discontinuous, a large amount of resin in the trough is used, and is irradiated by an ultraviolet ray, if the printing is not used in a short time, the resin is damped and absorbed, the light irradiation can react, the secondary use of the photosensitive resin is seriously affected, and the resin can only be used as a waste treatment. Therefore, in general, when printing, a lot of products need to be started up together to use the machine to print, but this also inevitably results in low printing efficiency, and it is difficult to popularize the technology on a large scale.

Meanwhile, in view of this, it is necessary to propose a 3D printing apparatus to solve the above-described drawbacks.

Disclosure of Invention

The utility model mainly aims to provide 3D printing equipment, and aims to solve the problem that resources are wasted when a material tank is filled with printing materials to start up for printing in the existing 3D printer.

To achieve the above object, the present utility model proposes a 3D printing apparatus, the 3D printing apparatus comprising: a frame; the forming platform is arranged on the frame and used for receiving printing materials; the light-emitting source is arranged on the frame, and light rays emitted by the light-emitting source are emitted to the forming platform; the moving assembly comprises a lifting mechanism arranged on the frame and a horizontal moving mechanism arranged on the frame, and the lifting mechanism is used for supporting and controlling the forming platform to lift; the coating assembly comprises a coating mechanism and a feeding mechanism, wherein the coating mechanism is connected with the horizontal moving mechanism, and the horizontal moving mechanism supports and controls the coating mechanism to reciprocate above the forming platform so that the coating mechanism can coat printing materials on the surface of the forming platform; the feeding mechanism is connected to the horizontal moving mechanism, the feeding mechanism is arranged on one side of the coating mechanism, and the feeding mechanism is matched with the coating mechanism and is used for conveying printing materials to the coating mechanism.

Preferably, the coating mechanism comprises a roller wheel, the roller wheel is connected to the horizontal moving mechanism in a rotating way, the feeding mechanism comprises a feeding groove, the feeding groove is connected to the horizontal moving mechanism, the feeding groove is arranged on one side of the roller wheel along the radial direction, and the roller wheel partially extends into the feeding groove along the radial direction.

Preferably, the feeding groove comprises a bottom wall and a side wall, the side wall is fixedly connected to one side, away from the roller, of the bottom wall along the width direction, and the height of one side, close to the roller, of the bottom wall is lower than that of one side, away from the roller, of the bottom wall.

Preferably, the coating mechanism further comprises a driving member, the driving member is connected to the horizontal moving mechanism, and an output end of the driving member is connected to one end of the roller, so as to drive the roller to rotate to coat the printing material on the surface of the forming platform.

Preferably, a feeding gap is provided between the bottom wall and the roller.

Preferably, the feeding assembly further comprises a feeding pipe, wherein a discharge end of the feeding pipe is arranged at the top of the feeding groove and used for conveying the printing material to the inside of the feeding groove.

Preferably, the coating mechanism further comprises a first scraper, the first scraper is arranged on one side of the feeding groove, which is away from the roller, and the lowest point of the first scraper is not higher than the lowest point of the roller.

Preferably, the coating mechanism further comprises a second scraper, and the second scraper is arranged on one side of the first scraper, which is away from the feeding groove.

Preferably, a heating element is arranged on the first scraper; and/or, the first scraper is a vacuum adsorption scraper.

Preferably, the coating mechanism further comprises a light barrier, the light barrier is arranged at one end of the roller towards the light-emitting source, and the light barrier is covered on the roller and the feeding groove.

Compared with the prior art, the 3D printing equipment provided by the utility model has the following beneficial effects:

according to the technical scheme, the feeding mechanism and the coating mechanism are arranged above the forming platform, the feeding mechanism conveys printing materials to the coating mechanism, the coating mechanism coats the printing materials on the surface of the forming platform, the forming platform does not need to be soaked in the trough, the size of the forming platform does not need to be considered, the purpose of coating printing according to the weight of a model can be achieved, the purpose of starting up and printing can be achieved only by a small amount of printing materials, resources of the printing materials are saved, the cost is reduced, and the printing efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an overall structure of an embodiment of a 3D printing apparatus according to the present utility model;

FIG. 2 is a schematic view of the mating structures of one embodiment of the moving assembly, forming table and coating assembly of the present utility model;

FIG. 3 is a schematic view of one embodiment of a coating assembly according to the present utility model;

FIG. 4 is a second schematic view of an embodiment of the coating assembly of the present utility model;

FIG. 5 is a third schematic view of an embodiment of the coating assembly of the present utility model;

FIG. 6 is a cross-sectional view taken along the direction A of FIG. 5;

FIG. 7 is a schematic view of an embodiment of a lifting mechanism and a forming platform according to the present utility model;

FIG. 8 is a schematic view of a horizontal movement mechanism and coating assembly according to an embodiment of the present utility model;

fig. 9 is a schematic structural view of an embodiment of the horizontal moving mechanism of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 to 9, the present utility model proposes a 3D printing apparatus 100, the 3D printing apparatus 100 comprising: a frame 1; a forming platform 2, wherein the forming platform 2 is arranged on the frame 1 and is used for receiving the printing material 300; the light-emitting source 3 is arranged on the frame 1, and light rays emitted by the light-emitting source 3 are emitted to the forming platform 2; a moving assembly 4, wherein the moving assembly 4 comprises a lifting mechanism 41 arranged on the frame 1 and a horizontal moving mechanism 42 arranged on the frame 1, and the lifting mechanism 41 is used for supporting and controlling the forming platform 2 to lift; a coating assembly 5, wherein the coating assembly 5 comprises a coating mechanism 51 and a feeding mechanism 52, the coating mechanism 51 is connected to the horizontal moving mechanism 42, and the horizontal moving mechanism 42 supports and controls the coating mechanism 51 to reciprocate above the molding platform 2 so that the coating mechanism 51 applies the printing material 300 on the surface of the molding platform 2; the feeding mechanism 52 is connected to the horizontal moving mechanism 42, the feeding mechanism 52 is disposed at one side of the coating mechanism 51, and the feeding mechanism 52 is disposed in cooperation with the coating mechanism 51 and delivers the printing material 300 to the coating mechanism 51.

Specifically, the 3D printing apparatus 100 includes a frame 1, a molding platform 2, a light emitting source 3, a moving assembly 4, and a coating assembly 5, the frame 1 is a frame body structure for supporting and fixing other components, the molding platform 2 is disposed on the frame 1, and the molding platform 2 is used for receiving a printing material 300 to print out a product on the molding platform 2. The printing material 300 is generally a resin material, and may be a photosensitive resin, which may be in a liquid or paste form, or may be a ceramic resin, a metal mixed resin, or a plastic fluid in a non-newtonian fluid.

The light-emitting source 3 is connected to the frame 1 and is higher than the forming platform 2, so that ultraviolet rays emitted by the light-emitting source 3 directly irradiate to the forming platform 2, and the liquid photopolymer is photo-cured layer by layer. The moving assembly 4 comprises a lifting mechanism 41 and a horizontal moving mechanism 42, which are both arranged on the frame 1 and respectively matched with the forming platform 2 and the coating assembly 5, the forming platform 2 is fixedly connected to the lifting end of the lifting mechanism 41, the lifting mechanism 41 controls the lifting of the forming platform 2, the coating assembly 5 is fixedly connected to the moving end of the horizontal moving mechanism 42, the horizontal moving mechanism 42 drives the coating assembly 5 to horizontally move, and the height of the horizontal moving mechanism 42 can be higher than that of the lifting mechanism 41, so that the coating assembly 5 can be conveniently driven to paint the printing material 300 on the surface of the forming platform 2.

In detail, the coating assembly 5 includes a coating mechanism 51 and a feeding mechanism 52, the coating mechanism 51 is connected to the horizontal moving mechanism 42, the horizontal moving mechanism 42 drives the coating mechanism 51 to reciprocate above the forming platform 2, so as to facilitate printing out a product, the coating mechanism 51 is used for coating the printing material 300 on the surface of the forming platform 2, during the printing process, except that the first layer needs to be coated on the whole forming platform 2, as the first layer is cured by ultraviolet, the forming platform 2 descends, the coating mechanism 51 only coats the 3D product 200, and does not contact with the forming platform 2 any more until the final 3D product 200 is printed out, thus realizing that only the model size is needed to add the printing material 300, and only the specific 3D product 200 is required to be coated later, so that the use and waste of the printing material 300 are greatly reduced.

The feeding mechanism 52 is disposed at one side of the coating mechanism 51, and is used for providing the printing material 300 for the coating mechanism 51, after the coating mechanism 51 is coated with the printing material 300, the coating mechanism 51 can supplement the printing material 300 for the coating mechanism 51, so that the coating mechanism 51 is convenient to coat in the next step, and the feeding mechanism 52 is also disposed on the horizontal moving mechanism 42, so that the feeding mechanism 52 can move horizontally along with the coating mechanism 51, and the printing material 300 can be conveniently added to the feeding mechanism 52 at any time and any place.

The structure of the coating mechanism 51 may take a variety of forms depending on the actual need, and in one embodiment, may be provided as a brush; in another embodiment, the feeding mechanism 52 may be configured as a roller, a spray gun, or the like, and the feeding mechanism may be configured as a feeding pipe, a trough, or the like according to the configuration of the coating mechanism 51.

In detail, the specific structure of the moving assembly 4 may be set according to actual needs, in this embodiment, as shown in fig. 2 and 7, the lifting mechanism 41 is disposed on the frame 1 along the height direction of the frame 1, the lifting mechanism 41 includes a first motor 411, a first guide rail 412, a screw rod 413 and a first slider 414, the first guide rail 412 is fixedly connected to the frame 1 along the height direction of the frame 1, the first motor 411 is disposed on the top of the first guide rail 412, the screw rod 413 is connected to the output end of the first motor 411 and is disposed along the height direction of the first guide rail 412, the first slider 414 is fixedly connected to the outer surface of the screw rod 413, the first guide rail 412 is used for guiding the first slider 414, the forming platform 2 is connected to the connecting end of the first slider 414, and the first motor 411 drives the screw rod 413 to drive the slider to lift, so as to drive the forming platform 2 to lift.

As shown in fig. 8 and 9, the horizontal moving mechanism 42 is arranged along the horizontal direction of the frame 1, the horizontal moving mechanism 42 comprises a second motor 421, a second guide rail 422, a synchronous wheel 423, a belt 424 and a second slider 425, the second guide rail 422 is arranged on the frame 1 along the coating direction of the forming platform 2, the second motor 421 is arranged on the frame 1 and is arranged at the first end of the second guide rail 422, the synchronous wheel 423 is connected with the output shaft of the second motor 421, the second end of the second guide rail 422 is also provided with the synchronous wheel 423, the belt 424 is sleeved on the two synchronous wheels 423, the second slider 425 is fixedly connected with the belt 424, the second guide rail 422 is used for guiding the second slider 425, the coating component 5 is connected to the second slider 425, the second slider 425 is driven by the second motor 421 to drive the synchronous wheel 423 to rotate so as to drive the belt 424 to move, and then the second slider 425 is driven by the second slider 425 to reciprocate along the coating direction of the forming platform 2; in addition, in this embodiment, two sets of moving mechanisms are provided, a set of second guide rails 422, synchronizing wheels 423, belts 424 and second sliders 425 are synchronously provided on the other side along the coating direction of the forming platform 2, the opposite synchronizing wheels 423 are connected by a transmission shaft 426, and two ends of the coating component 5 are connected with a set of moving mechanisms.

It should be understood that, at present, the trough of the sinking type photo-curing 3D printer must be filled with resin first, however, when a high viscosity resin material is adopted, the molding platform 2 is difficult to descend in the environment of the high viscosity resin, and the doctor blade cannot scrape off, so that the printing material is limited to the resin with low viscosity and good fluidity, as is well known, the thinner the photosensitive resin, the lower the viscosity is, the worse the performance of the printed product is, the performance of the printed product is greatly different from the actual use, and the production and use cannot be satisfied. According to the technical scheme, the feeding mechanism 52 and the coating mechanism 51 are arranged above the forming platform 2, the feeding mechanism 52 conveys the printing material 300 to the coating mechanism 51, the coating mechanism 51 coats the printing material 300 on the surface of the forming platform 2, the forming platform 2 is not required to be soaked in a trough, the forming platform 2 is not required to be taken into consideration, high-viscosity resin materials can be adopted for printing, production and use are met, the purpose of printing the coating according to the weight of a model can be achieved, the purpose of starting up and printing only by a small amount of the printing material 300 is achieved, resources of the printing material 300 are saved, cost is reduced, and printing efficiency is improved.

As a preferred embodiment of the present utility model, the coating mechanism 51 includes a roller 511, the roller 511 is rotatably connected to the horizontal moving mechanism 42, the feeding mechanism 52 includes a feeding groove 521, the feeding groove 521 is connected to the horizontal moving mechanism 42, the feeding groove 521 is disposed at one side of the roller 511 in a radial direction, and the roller 511 partially extends into the feeding groove 521 in the radial direction.

It is noted that, in the present embodiment, the coating mechanism 51 is configured as a roller 511, the roller 511 is rotatably connected to the horizontal moving mechanism 42, the horizontal moving mechanism 42 drives the roller 511 to move horizontally, and the roller 511 applies the printing material 300 adhered to the surface of the roller 511 to the forming platform 2 by rotation; the feeding mechanism 52 is provided as a feeding groove 521, the feeding groove 521 is provided on one side of the roller 511 in the radial direction and is matched with the roller 511, the roller 511 partially extends into the feeding groove 521 in the radial direction, the surface of the roller 511 can contact the printing material 300 in the feeding groove 521, the opening of the feeding groove 521 can face the top, a notch is formed on one side of the feeding groove 521, which is close to the roller 511, so that the roller 511 can extend into the feeding groove 521, or can face the roller 511, and the roller 511 can only partially extend into the feeding groove 521 to supplement the printing material 300.

The roller 511 can be used for coating the printing material 300 on the forming platform 2 and supplementing the printing material 300 through the feeding groove 521, and when the roller 511 rotates, the printing material 300 can fill the material layer in the gap on the surface of the roller 511, so that the roller 511 can always store the optimal surface resin layer thickness and uniformly coat the 3D product 200, therefore, when in use, the printing can be started up by only needing a small amount of the printing material 300, after the printing is finished, the printing material 300 in the feeding groove 521 is not illuminated and polluted, and can be recycled for secondary use, thereby greatly saving resources.

As a preferred embodiment of the present utility model, the feeding groove 521 includes a bottom wall 5211 and a side wall 5212, wherein the side wall 5212 is fixedly connected to a side of the bottom wall 5211 facing away from the roller 511 in the width direction, and a height of a side of the bottom wall 5211 near the roller 511 is lower than a height of a side of the bottom wall 5211 facing away from the roller 511.

In detail, in this embodiment, the specific structure of the feeding tank 521 includes a bottom wall 5211 and a side wall 5212, the bottom wall 5211 is disposed close to the roller 511, the side wall 5212 is fixedly connected to one side of the bottom wall 5211, which is away from the roller 511, in the width direction, and is configured to be L-shaped, so as to form an opening structure towards the roller 511, the roller 511 is directly contacted with the resin in the feeding tank 521, the bottom wall 5211 is obliquely disposed, the height of one side of the bottom wall 5211, which is close to the roller 511, is lower than the height of one side of the bottom wall 5211, which is away from the roller 511, and the resin always flows to one side of the roller 511 under the action of gravity, so as to facilitate the replenishment of the roller 511 with the resin.

The feed tank 521 further includes a baffle 5214, and the baffle 5214 is attached to both ends of the feed tank 521 in the longitudinal direction, and the baffle 5214 is provided to prevent the resin material in the feed tank 521 from flowing out from both sides.

As a preferred embodiment of the present utility model, the coating mechanism 51 further includes a driving member 512, the driving member 512 is connected to the horizontal moving mechanism 42, and an output end of the driving member 512 is connected to one end of the roller 511, so as to drive the roller 511 to rotate to apply the printing material 300 on the surface of the forming platform 2.

It should be understood that, the driving member 512 is disposed on the horizontal moving mechanism 42, the driving member 512 may be a motor or an oil cylinder, etc., the roller 511 may be directly connected to the output end of the driving member 512, or may be connected to the output end of the driving member 512 by using a driving belt 5122 to connect the driving wheel 5121 and one end of the roller 511, and the roller 511 is driven to rotate by the driving member 512, so as to coat the printing material 300 on the surface of the forming platform 2, the rotation speed of the roller 511 is adjustable, so that the use of resins with different viscosities is facilitated, and the driving member 512 is disposed, so that the printing material 300 can be coated more quickly and uniformly, and the printing efficiency is improved.

Meanwhile, the continuous rotation of the roller 511 can drive the resin material in the feeding groove 521 to continuously rotate, so that the resin molecules in the feeding groove 521 are fused more uniformly, the problems of color paste precipitation, resin layering and the like can be avoided, and the device can be better suitable for the use of high-viscosity resin.

Further, a feeding gap 5213 is provided between the bottom wall 5211 and the roller 511.

It should be noted that, a feeding gap 5213 is disposed between the bottom wall 5211 of the feeding groove 521 and the side surface of the roller 511, and the width of the feeding gap 5213 determines the thickness of the printing material 300 on the surface of the roller 511, so that products with different layer thicknesses and different precision can be printed conveniently by providing feeding gaps 5213 with different widths.

The width of the feeding gap 5213 is generally set to 0.1 to 10 mm, and since the driving member 512 can drive the roller 511 to rotate all the time, the printing material 300 in the feeding groove 521 does not overflow from the feeding gap 5213 even if the feeding gap 5213 is provided.

In summary, the 3D printing apparatus 100 of the present utility model is suitable for printing ultra-high viscosity photosensitive resin or paste resin, because the more viscous the resin is, the stronger the viscosity of the resin is, and because the driving member 512 drives the roller 511 to rotate continuously, the ultra-high viscosity photosensitive resin can be coated on the forming platform 2 by the roller 511 without being affected by viscosity, so that the problems that a large amount of resin is required to be added for printing and curable materials with high viscosity resin components cannot be printed in the conventional machine printing are solved.

As a preferred embodiment of the present utility model, the feeding assembly further includes a feeding pipe 522, and a discharge end of the feeding pipe 522 is disposed at a top of the feeding groove 521, for conveying the printing material 300 into the feeding groove 521.

In detail, the printing material 300 in the feed chute 521 may be conveyed through a conveying path or through a conveying pipe. In this embodiment, a feeding pipe 522 is disposed at the top of the feeding trough 521, a discharge port of the feeding pipe 522 is communicated with the feeding trough 521, and the printing material 300 is conveyed to the feeding trough 521 through the feeding pipe 522, so that the printing apparatus is simple and practical in structure and small in occupied area.

As a preferred embodiment of the present utility model, the coating mechanism 51 further includes a first scraper 513, the first scraper 513 is disposed on a side of the feed groove 521 facing away from the roller 511, and a lowest point of the first scraper 513 is not higher than a lowest point of the roller 511.

Specifically, the first doctor 513 is disposed on a side of the feeding groove 521, which is away from the roller 511, and the first doctor 513 is also connected to the horizontal moving mechanism 42, after the roller 511 is coated, the first doctor 513 can scrape the printing material 300 smeared on the roller 511, and the lowest point of the first doctor 513 is not higher than the lowest point of the roller 511, i.e. the height of the first doctor 513 can be set according to the actual situation, can be set to be flush with the roller 511, or can be set to be slightly lower than the roller 511.

Further, the coating mechanism 51 further comprises a second scraper 514, and the second scraper 514 is disposed on a side of the first scraper 513 facing away from the feeding groove 521.

It should be noted that the number of the scrapers may be set according to actual needs, in this embodiment, two scrapers are provided, the second scraper 514 is disposed on a side of the first scraper 513 away from the feeding groove 521, and the two scrapers may scrape the printing material 300 coated on the surface more uniformly and flatly, so as to improve product precision.

As a preferred embodiment of the present utility model, the first scraper 513 is provided with a heating member 515; and/or, the first doctor 513 is a vacuum suction doctor.

In detail, according to the printing material 300, different structures may be optionally added to the first doctor 513 to ensure that the first doctor 513 does not adhere to the printing material 300, and a heating element 515 may be disposed on the first doctor 513 to heat the doctor so that the resin does not adhere to the knife, thereby ensuring that the first doctor 513 is clean; when the printing material 300 has the characteristic of high viscosity, the first scraper 513 can be set as a vacuum adsorption scraper, the vacuum adsorption pipe 516 is adopted, and the wire drawing and the excessive printing material 300 on the first scraper 513 are pumped away by using vacuumizing, so that the clean and smooth surface of a printing piece is ensured; it is also possible to provide both the heating member 515 and the vacuum suction on the first blade 513. In addition, the second scraper 514 may also be provided with the heating member 515 or vacuum suction by repeating the above operations, or with the heating member 515 and the vacuum suction pipe 516 at the same time.

As a preferred embodiment of the present utility model, the coating mechanism 51 further includes a light barrier 517, the light barrier 517 is disposed at an end of the roller 511 facing the light source 3, and the light barrier 517 covers the roller 511 and the feed groove 521.

Specifically, the light barrier 517 is provided, the light barrier 517 is covered on the upper ends of the roller 511 and the feeding groove 521, the light barrier 517 is used for shielding ultraviolet rays emitted by the light emitting source 3, preventing the printing material 300 on the surface of the roller 511 from solidifying, preventing the ultraviolet rays from irradiating into the feeding groove 521, and facilitating recycling of the printing material 300 in the feeding groove 521.

In addition, the roller 511, the driving element 512, the feeding groove 521, the first scraper 513, the light barrier 517 and other structures of the coating assembly 5 can be integrally connected by arranging connecting plates 518 at two ends of the coating assembly 5, and the connecting plates 518 are fixedly connected to the second sliding blocks 425, so that the horizontal moving mechanism 42 is convenient to drive the coating assembly 5 to move.

Specifically, the printing process of the 3D printing apparatus 100 of the present utility model is: the driving member 512 drives the roller 511 to rotate so that the photosensitive resin in the feeding trough 521 is uniformly adhered to the surface of the roller 511, and the surface of the roller 511 forms resin with required thickness through the arrangement of the feeding gap 5213; the horizontal moving mechanism 42 drives the coating assembly 5 to move horizontally and drives the roller 511 to coat the resin on the surface of the roller 511 on the forming platform 2, and a thin coating layer of resin is formed on the forming platform 2; after the roller 511 is coated, the first doctor 513 then smoothes out the portion that may be coated unevenly, ensuring that the resin coating plane of the entire molding platform 2 is horizontal; the light source 3 irradiates ultraviolet rays, and the photosensitive resin is solidified to form a three-dimensional pattern prepared by a computer in advance; the lifting mechanism 41 drives the forming platform 2 to move downwards by the height of one solidified layer, and the distance is determined by the thickness of the printed layer; the horizontal moving mechanism 42 drives the roller 511 to repeatedly paint and scrape the 3D product 200 of the forming platform 2; the operations of coating, strickling, curing, etc. are repeated continuously, and finally the layers are overlapped layer by layer, thus obtaining the required 3D product 200.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A 3D printing apparatus, characterized in that the 3D printing apparatus comprises:

a frame;

the forming platform is arranged on the frame and used for receiving printing materials;

the light-emitting source is arranged on the frame, and light rays emitted by the light-emitting source are emitted to the forming platform;

the moving assembly comprises a lifting mechanism arranged on the frame and a horizontal moving mechanism arranged on the frame, and the lifting mechanism is used for supporting and controlling the forming platform to lift;

the coating assembly comprises a coating mechanism and a feeding mechanism, wherein the coating mechanism is connected with the horizontal moving mechanism, and the horizontal moving mechanism supports and controls the coating mechanism to reciprocate above the forming platform so that the coating mechanism can coat printing materials on the surface of the forming platform; the feeding mechanism is connected to the horizontal moving mechanism, the feeding mechanism is arranged on one side of the coating mechanism, and the feeding mechanism is matched with the coating mechanism and is used for conveying printing materials to the coating mechanism.

2. The 3D printing apparatus of claim 1, wherein the coating mechanism comprises a roller wheel rotatably coupled to the horizontal movement mechanism, the feed mechanism comprises a feed trough coupled to the horizontal movement mechanism, the feed trough is disposed on a radial side of the roller wheel, and the roller wheel extends partially into the feed trough in a radial direction.

3. The 3D printing apparatus of claim 2, wherein the feed trough comprises a bottom wall and a side wall, the side wall being fixedly connected to a side of the bottom wall facing away from the roller in a width direction, a height of a side of the bottom wall adjacent to the roller being lower than a height of a side of the bottom wall facing away from the roller.

4. A 3D printing apparatus according to claim 3, wherein the coating mechanism further comprises a driving member connected to the horizontal movement mechanism, an output end of the driving member being connected to one end of the roller to drive the roller to rotate to apply the printing material to the surface of the forming stage.

5. The 3D printing apparatus of claim 4, wherein a feed gap is provided between the bottom wall and the roller.

6. The 3D printing apparatus of any of claims 1-5, wherein the feed assembly further comprises a feed tube having a discharge end disposed at a top of the feed trough for delivering printing material to an interior of the feed trough.

7. The 3D printing apparatus of any of claims 1-5, wherein the coating mechanism further comprises a first scraper disposed on a side of the feed trough facing away from the roller, a lowest point of the first scraper not being higher than a lowest point of the roller.

8. The 3D printing apparatus of claim 7, wherein the coating mechanism further comprises a second scraper disposed on a side of the first scraper facing away from the feed trough.

9. The 3D printing apparatus of claim 7, wherein the first blade has a heating element disposed thereon;

and/or, the first scraper is a vacuum adsorption scraper.

10. The 3D printing apparatus of claim 2, wherein the coating mechanism further comprises a light barrier disposed at an end of the roller facing the light emitting source, the light barrier covering the roller and the feed trough.