CN218948441U

CN218948441U - Liquid containing device for 3D printing and 3D printer

Info

Publication number: CN218948441U
Application number: CN202222963195.2U
Authority: CN
Inventors: 张靖; 高中宇; 王迪锋; 陈明; 王冬剑; 金良
Original assignee: Zhejiang Xunshi Technology Co Ltd
Current assignee: Zhejiang Xunshi Technology Co Ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-05-02
Anticipated expiration: 2032-11-08

Abstract

The utility model discloses a liquid containing device for 3D printing and a 3D printer, which relate to the technical field of 3D printing and comprise the following components: a fixing structure, at least a part of which forms a side wall of the liquid containing device; a layered release structure, at least a portion of which forms the bottom of the liquid containing device and forms a liquid containing space together with the fixing structure for containing a liquid printing material; the demolding structure comprises a release film, an elastic plate and a substrate; the elastic plate is arranged below the release film; the base plate is arranged below the elastic plate, and a gap is formed between the base plate and the elastic plate so as to form a fluid channel between the base plate and the elastic plate; the elastic plate and the base plate are installed on the installation base of the 3D printer. The liquid containing device can eliminate the vacuum adsorption force between the release film and the elastic plate, so that the demolding force is obviously reduced, and the forming time of 3D printing is effectively shortened.

Description

Liquid containing device for 3D printing and 3D printer

Technical Field

The utility model relates to the technical field of 3D printing, in particular to a liquid containing device for 3D printing and a 3D printer.

Background

In 3D printing, the liquid photosensitive resin is cured in a designated area between the printing platform and the resin tank, and after printing is completed, the cured liquid photosensitive resin, i.e., the cured model, is removed from the printing platform to complete printing of the cured model. However, since the liquid photosensitive resin is adhered to the resin tank during the curing process, it is often necessary for the printing platform to move the cured liquid photosensitive resin so that the cured liquid photosensitive resin is separated from the resin tank.

In the traditional 3D printing technology, the resin tank bottom is the base plate of printing opacity, and in the drawing of patterns in-process, because bonding area is big, and directly separate between solidification model and the base plate, lead to the drawing of patterns power (solidification model and printing opacity base plate's bonding power) too big, arouse following problem easily: 1. loosening occurs in the installation of the transparent substrate, the transparent substrate is used as a printing reference surface, and the precision of a cured model is reduced after loosening; 2. the noise is high; 3. and the risk of edge warping and plate falling easily occurs in the curing model during demolding.

Accordingly, those skilled in the art have been working to develop a liquid containing device for 3D printing and a 3D printer to reduce the mold release force.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problems to be solved by the present utility model include: how to improve the demolding effect by reducing the demolding force.

To achieve the above object, the present utility model provides a liquid containing device for 3D printing, including:

a securing structure, at least a portion of the securing structure constituting a sidewall of the liquid containing device, and the liquid containing device configured to be securable to a mounting base of a 3D printer by the securing structure;

a layered release structure, at least a portion of which forms the bottom of the liquid containing device and forms a liquid containing space together with the fixing structure for containing a liquid printing material;

the demolding structure comprises a release film, an elastic plate and a substrate;

the elastic plate is arranged below the release film;

the base plate is arranged below the elastic plate, and a gap is formed between the base plate and the elastic plate so as to form a fluid channel between the base plate and the elastic plate;

the elastic plate and the base plate are mounted on a mounting base of the 3D printer.

Further, the elastic plate, the substrate, and the release film are transparent.

Further, the fixing structure comprises an annular frame and an annular collet, and the collet is arranged below the frame.

Further, the release film is fixed between the frame and the shoe.

Further, the frame forms the side wall of the liquid containing device, and the liquid containing device is fixed on the base of the 3D printer through the bottom support.

Further, a spacer is provided between the base plate and the elastic plate to form a gap between the base plate and the elastic plate.

Further, the separator is an FEP break point type adhesive tape, and the thickness of the FEP break point type adhesive tape is 0.1-0.2 mm.

Further, the FEP breakpoint type adhesive tapes are arranged on the substrate in an array mode and are arranged at the edge position of the elastic plate on the projection surface of the substrate.

Further, an arc-shaped protrusion is provided in an intermediate region where the base plate and the elastic plate are opposed.

Further, at least one of the opposite surfaces of the elastic plate and the substrate is a rough surface.

Further, the elastic plate is made of one or more of the following glasses: soda lime glass, medium alumina glass, high alumina glass.

Further, the release film is made of one or more of the following materials: FEP, NFEP, TPX, AF2400 and 2400.

Further, the release film is a semipermeable film.

Further, a layer of PET film is stuck on the elastic plate.

The utility model also provides a 3D printer, which comprises a printing platform, a liquid containing device, a mounting base, a module and an exposure mechanism;

the printing platform is driven by the module to move;

the liquid containing device is arranged on the mounting base;

the exposure mechanism emits radiation light with a specified shape, and projects the radiation light into the liquid containing device to solidify the liquid photosensitive resin in a specified area;

the liquid containing device comprises:

the elastic plate is arranged below the release film;

Further, the release film is fixed between the frame and the shoe.

Compared with the prior art, the method has the beneficial technical effects that at least, as the vacuum adsorption force between the release film and the elastic plate is eliminated, the demolding force is obviously reduced, and the time for sheet printing is shorter along with the reduction of the demolding force, so that the forming time of 3D printing is effectively shortened. And as the demolding force is reduced, the deformation of the release film is reduced, and the service life is effectively prolonged.

The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.

Drawings

FIG. 1 is a schematic illustration of a stripping scheme prior to modification;

FIG. 2 is a schematic view of a liquid container according to a preferred embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a liquid containing apparatus according to a preferred embodiment of the present utility model;

FIG. 4 is an enlarged partial view of a preferred embodiment of the present utility model;

FIG. 5 is a schematic view of a preferred embodiment of the present utility model in cooperation with an exposure mechanism;

FIG. 6 is a schematic view of providing a roughened surface on an elastic plate;

FIG. 7 is a schematic view of providing a roughened surface on a substrate;

FIG. 8 is a schematic view of providing roughened surfaces on both the elastomeric sheet and the base sheet;

FIG. 9 is a schematic view of providing an arc-shaped protrusion in the middle region of the elastic plate and the base plate;

FIG. 10 is a schematic illustration of step 1 of the demolding process of the present utility model;

FIG. 11 is a schematic view of step 2 of the demolding process of the present utility model;

FIG. 12 is a schematic illustration of step 3 of the demolding process of the present utility model;

FIG. 13 is a schematic view showing the breaking of vacuum state in step 3 of the demolding process of the present utility model;

FIG. 14 is a graph of the values of the stripping force before/after improvement as a function of printing time;

fig. 15 is a schematic diagram showing the overall structure of a 3D printer according to a preferred embodiment of the present utility model.

The device comprises a 1-frame, a 2-bottom support, a 3-release film, a 4-elastic plate, a 5-substrate, a 6-first steel ring, a 7-second steel ring, an 8-convex edge, a 9-rib, a 10-FEP breakpoint type adhesive tape, a 20-mounting base, a 21-resin groove, a 211-liquid containing device, a 22-printing platform, a 23-liquid photosensitive resin, a 231-curing model, a 24-module, a 25-optical machine, a 26-reflective mirror, a 90-exposure mechanism and 91-radiation light.

Detailed Description

The following description of the preferred embodiments of the present utility model refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present utility model may be embodied in many different forms of embodiments and the scope of the present utility model is not limited to only the embodiments described herein.

In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present utility model is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.

Fig. 1 shows a demolding scheme before improvement, as shown in fig. 1, the resin tank 21 is in a disc shape as a whole, and liquid photosensitive resin is contained in the resin tank 21 in operation. The resin tank 21 is mounted on the mounting base of the 3D printer, and is usually detachably fitted. The bottom of the resin tank 21 is a light-transmitting substrate 5, and a release film 3 is attached to the upper side of the substrate 5. The exposure mechanism 90 emits radiation light 91 to expose the liquid photosensitive resin contained in the resin tank 21 through the substrate 5 and the release film 3, and the liquid photosensitive resin in a specified region is cured by controlling the radiation light 91. After each layer of curing is completed, the cured liquid photosensitive resin (i.e., the curing mold) is adhered to the printing platform and the release film 3 of the resin tank 21, respectively. When the next layer is ready for curing, the printing platform of the 3D printer drives the curing model to move under the drive of the linear module, so that the release film 3 is gradually separated from the curing model when following the movement of the curing model, and the detachment of the curing model from the resin tank 21 is completed. However, when the cured mold is lifted and released, the release film 3 is bonded to the surface of the substrate 5, and vacuum adsorption is generated between the release film and the substrate, resulting in a large release force. The large demolding force generated by the separation mode may loosen the fixation of the substrate 5 serving as a printing reference surface, and may cause the conditions of edge warping, plate falling and the like of the cured model, so that the demolding effect is poor. There are other problems such as loud noise; the release film is large in deformation, creep is likely to occur, and the service life is reduced.

FIG. 2 is a schematic view of a liquid container according to a preferred embodiment of the present utility model. Fig. 3 is a schematic cut-away view. The liquid containing device 211 comprises a frame 1, a bottom support 2, a release film 3, an elastic plate 4 and a base plate 5. The liquid containing device is fixedly installed on the installation base 20 of the 3D printer, and a detachable embedding mode is usually adopted. The release film 3 is arranged between the frame 1 and the collet 2, and the elastic plate 4 and the base plate 5 are arranged on the mounting base 20 of the 3D printer.

As shown in fig. 4, the frame 1 is detachably connected with the first steel ring 6 by screws, and the first steel ring 6 is detachably connected with the second steel ring 7 by screws. The release film 3 is fixed between the first steel ring 6 and the second steel ring 7. The side walls of the frame 1 and the upper surface of the release film 3 enclose a region for storing printing solution. The frame 1 is of an annular structure, the inner ring of the frame extends downwards to form a convex rib 8, and the position of the convex rib 8 is lower than the installation positions of the release film 8 in the first steel ring 6 and the second steel ring 7. Therefore, in the process of assembling the first steel ring 6 and the second steel ring 7 to the frame 1, the release film 3 can be tightened by the convex edges 8, so that printing failure caused by loosening and wrinkling of the release film 3 in the demolding process is avoided. Sealing rings are respectively arranged between the first steel ring 6 and the frame 1 and between the first steel ring and the release film 3. The shoe 2 is also of annular configuration with an inner ring extending inwardly with a rib forming rib 9.

In this embodiment, the release film 3, the elastic plate 4 and the substrate 5 are all made of transparent materials, and the "transparent" means that the exposure mechanism 90 emits the radiation 91, and after penetrating the release film 3, the elastic plate 4 and the substrate 5, the radiation intensity does not change significantly, and the liquid photosensitive resin can be cured.

As shown in fig. 5, a separator is disposed on the substrate 5, in this embodiment, the separator is an FEP break-point adhesive tape 10 to separate the substrate 5 and the elastic plate 4, and a fluid channel is formed between the two, so that a non-vacuum state is formed between the substrate 5 and the elastic plate 4, and vacuum adsorption is avoided between the elastic plate 4 and the substrate 5, so that the release film 3 and the elastic plate 4 are easier to deform. And then, the difference of the elastic modulus of the release film 3 and the elastic plate 4 is utilized to break vacuum between the release film 3 and the elastic plate, so that the demolding force is reduced to facilitate smooth demolding.

When assembled, the side walls of the frame 1 and the upper surface of the release film 3 enclose an area where the printing solution (typically a liquid photosensitive resin) is stored. The release film 3 is positioned above the elastic plate, and the upper side of the elastic plate is attached to the release film 3. The exposure mechanism 90 emits radiation light 91 to expose the liquid photosensitive resin contained in the tank through the substrate 5, the elastic plate 4 and the release film 3 in this order, and the liquid photosensitive resin in a specified area is cured by controlling the radiation light 91. After curing is completed, the cured liquid photosensitive resin (i.e. the curing model) is taken out of the liquid containing device (i.e. the mold is released), and printing of the curing model is completed. The release film 3 and the elastic plate 4 are initially in a vacuum state, the curing model drives the release film 3 to deform upwards through adhesion force, and the elastic plate 4 deforms synchronously under the action of vacuum adsorption. After further lifting, as the elastic modulus of the release film 3 is far smaller than that of the elastic plate 4, the release film 3 is deformed more under the action of the adhesive force, and the elastic plate 4 is deformed less. When in deformation, the release film 3 and the elastic plate 4 are subjected to tangential shearing force on the contact surface and gradually form relative movement trend, and the vacuum state between the release film and the elastic plate is eliminated; with the increase of deformation, the release film 3 and the elastic plate 4 are relatively displaced in the partial area contacted with each other, and then stripping is completed, so that demolding is realized. The demolding process is only in the initial stage, namely when the release film 3 and the elastic plate 4 do not generate relative displacement, and the demolding process is in a vacuum state, so that the vacuum is subsequently broken, and the demolding force is small.

In a preferred embodiment of the present utility model, the separator may be an array-type FEP (Fluorinated ethylene propylene, fluorinated ethylene propylene copolymer) break-point tape 10 with an elastic sheet 4 placed thereon. The FEP break point tape 10 preferably has a thickness of 0.1mm to 0.2mm, and more preferably 0.16mm. The FEP break-point type adhesive tape 10 is used for separating the substrate 5 and the elastic plate 4, and forming a fluid channel therebetween, in this embodiment, an air channel, so that air enters between the release film 3 and the elastic plate 4 during the demolding process, and the vacuum state between the two is broken, thereby facilitating demolding. If the FEP break-point type tape 10 is too thick, since the elastic plate 4 has a certain elasticity, if a partial area is depressed, printing accuracy may be affected, and if the FEP break-point type tape 10 is too thin, formation of a fluid passage may be affected.

The FEP break point type adhesive tape 10 is arranged in an array on the substrate 5 and is arranged at the edge position of the elastic plate 4 on the projection surface of the substrate 5. The edge position is an area where photo-curing is not performed during printing, and if the FEP break point type adhesive tape 10 is disposed at a non-edge position (i.e., a printing area), projection of the lamellar image in the liquid containing device may be affected, thereby affecting printing accuracy.

The elastic plate 4 is made of soda lime glass, medium alumina glass, high alumina glass, etc., and has a higher elastic modulus than the release film 3, about 60000MPa to 72000MPa. The upper side of the elastic plate 4 is attached to the release film 3, so that the elastic plate 4 and the release film 3 are easier to separate in the demolding process, and preferably, a layer of PET film can be attached to the elastic plate 4 to play a role in preventing adhesion. Because the PET film has better air tightness, when the release film 3 drives the elastic plate 4 to deform by means of vacuum adsorption force, the vacuum state between the release film 3 and the elastic plate 4 still exists briefly, and the vacuum state between the release film 3 and the elastic plate 4 in the whole demolding process is not disappeared due to the existence of the PET film. From the perspective of breaking vacuum, the arrangement of the PET film enables the elastic plate 4 and the release film 3 to be separated more easily in the demolding process, and is helpful for breaking vacuum to a certain extent. The film can be a plating layer or other smooth films and plating layers with non-stick properties.

The release film 3 may be one of FEP, NFEP, TPX, AF2400, with TPX (Transparent Polymer X) being preferred. In addition, the release film 3 may be a semipermeable film, such as an air/oxygen permeable film, the liquid photosensitive resin may not pass through, after each layer of demolding process is finished, the release film 3 falls back under the gravity and dead weight of the liquid photosensitive resin, and air between the release film 3 and the elastic plate 4 forms a layer of air layer on the upper surface of the release film 3 and the lower surface of the liquid photosensitive resin through the release film 3 due to the overflow of one part of the air and the existence of the air layer will obstruct the polymerization reaction of the liquid photosensitive resin in the region, which is generally called as dead zone (dead zone), and the release film 3 is configured as a semipermeable film to help reduce the adhesion force between the curing model and the release film 3, thereby reducing the demolding force.

In other embodiments of the present utility model, at least one of the opposite surfaces of the elastic plate 4 and the substrate 5 may be roughened, and the contact surface is in communication with the outside air through the roughness of the surface, so as to avoid vacuum adsorption.

Fig. 6-8 show three solutions for providing the resilient plate, the base plate with a roughened surface. That is, the rough surfaces are provided on the surfaces of the elastic plate 4 and the substrate 5 facing each other, and the rough surfaces are provided on the surfaces of the elastic plate 4 and the substrate 5 facing each other. The roughness is shown exaggerated and in practice, these are microstructures. The rough surface may be formed by etching the elastic plate/transparent substrate, or may be formed by a suitable coating on glass.

In the foregoing embodiment, the FEP break point type tape array is provided on the substrate 5, and is arranged at the edge position of the elastic plate 4 on the projection surface of the substrate 5. The central position of the elastic plate is still in a hollow and unsupported state, and under the gravity action of the liquid photosensitive resin, the middle recess can be caused, so that the precision is influenced. Thus, in another embodiment, after the FEP break-point tape array is arranged at the edge position, an arc-shaped protrusion 11 may be provided on the elastic plate/light-transmitting substrate, thereby forming a support in the middle region, as shown in fig. 9. In addition, an FEP breakpoint type adhesive tape array can be arranged in the middle area, and compared with the arc-shaped protrusions, the FEP breakpoint type adhesive tape is not easy to generate light scattering.

As one example, the demolding process includes:

step 1: as shown in fig. 10 (note: FEP break-point type tape is not shown), the module controls the printing platform 22 to descend to a certain height in the initial state of sheet printing. Specifically, when printing is started, the thickness of the layer of solidified model is the liquid photosensitive resin 23 between the printing platform 22 and the liquid containing device 211; when the resin between the layer newly generated by the curing model below the printing platform 22 and the liquid containing device 211 reaches the thickness of the layer of the curing model during the printing process, the exposure mechanism 90 exposes to light to cure the liquid photosensitive resin 23 in the designated area.

Step 2: as shown in fig. 11, this stage is a transition stage, the release film 3 and the elastic plate 4 are still in a vacuum state, the curing mold 231 drives the release film 3 to deform upwards through the adhesion force, and under the vacuum adsorption effect, the elastic plate 4 deforms synchronously, so that the same movement trend as that of the release film 3 is maintained.

Step 3: as shown in fig. 12, after further lifting, since the elastic modulus of the release film 3 is far smaller than that of the elastic plate 4, the release film 3 is deformed more and the elastic plate is deformed less under the action of the adhesive force, the vacuum between the release film 3 and the elastic plate 4 is broken, and the curing mold 231 and the release film 3 start to separate gradually. As shown in fig. 13, the release film 3 is greatly deformed by the adhesive force and a vacuum is formed in a partial space, when the vacuum state is broken. When in deformation, the release film 3 and the elastic plate 4 are subjected to tangential shearing force on the contact surface, and a movement trend is gradually formed; with the increase of deformation, the release film 3 and the elastic plate 4 are relatively displaced in the partial area where they are in contact, air enters the partial vacuum area 232 from A to B, and the vacuum is broken, so that the release film 3 and the elastic plate 4 are peeled off, and the elastic plate 4 falls back onto the separator, such as the FEP break point type adhesive tape 10.

Fig. 14 is a graph showing the change of the release force values before/after improvement with respect to the printing time, in which the abscissa s, the ordinate N, it can be seen that the release force after improvement is greatly reduced compared with that before improvement. In addition, after the demolding force is reduced, the demolding process can be completed through smaller deformation of the release film, the printing period is obviously shortened, and therefore the printing speed is improved.

In another embodiment, as shown in fig. 15, a schematic overall structure of a 3D printer including the above-mentioned liquid containing device includes a printing platform 22, a liquid containing device 211, a mounting base 20, a module 24 for lifting, a light machine 25, and a reflector 26 for reflecting radiant light to a reference surface. The liquid containing device 211 is mounted on the mounting base 20, and is usually detachably engaged. The structure of the liquid containing device 211 is shown in fig. 2-5, and includes a frame 1, a base 2, a release film 3, an elastic plate 4 and a base plate 5, and the specific structure is as described above. The liquid containing device 211 is fixedly installed on the installation base 20 of the 3D printer, and a detachable embedding manner is generally adopted. The release film 3 is disposed between the frame 1 and the shoe 2 of the resin tank 211, and the elastic plate 4 and the base plate 5 are disposed on the mounting base 20 of the 3D printer. The bottom of the liquid containing device 211 is a light-transmitting substrate 5, and a partition is provided on the substrate 5, in this embodiment, the partition is an FEP break point type adhesive tape 10, and an elastic plate 4 is placed above the partition, and the FEP break point type adhesive tape 10 separates the substrate 5 and the elastic plate 4, and forms a fluid channel therebetween. The release film 3 is positioned above the elastic plate 4, and the upper side of the elastic plate 4 is attached to the release film 3. The side walls of the frame 1 and the upper surface of the release film 3 enclose a region in which the printing solution (typically a liquid photosensitive resin) is stored. The exposure mechanism 90 emits radiation light 91 to expose the liquid photosensitive resin contained in the tank through the substrate 5, the elastic plate 4 and the release film 3 in this order, and the liquid photosensitive resin in a specified area is cured by controlling the radiation light 91. After curing is completed, the cured liquid photosensitive resin (i.e., the cured pattern) is taken out of the liquid holding device 211, and printing of the cured pattern is completed. The release film 3 and the elastic plate 4 are initially in a vacuum state, the curing model drives the release film 3 to deform upwards through adhesion force, and the elastic plate 4 deforms synchronously under the action of vacuum adsorption. After further lifting, as the elastic modulus of the release film 3 is far smaller than that of the elastic plate 4, the release film 3 is deformed more under the action of the adhesive force, and the elastic plate 4 is deformed less. When in deformation, the release film 3 and the elastic plate 4 are subjected to tangential shearing force on the contact surface and gradually form relative movement trend, and the vacuum state between the release film and the elastic plate is eliminated; with the increase of deformation, the release film 3 and the elastic plate 4 are relatively displaced in the partial area contacted with each other, and then stripping is completed, so that demolding is realized. The demolding force is small because the demolding is not performed in a vacuum state.

In this embodiment, the optical machine 25 and the reflective mirror 26 are the exposure mechanism 90 of the printer, and the radiation light 91 is reflected by the reflective mirror 26 after being emitted from the optical machine 25, and then is projected onto the liquid photosensitive resin 23 in the liquid containing device 211 to expose and cure the liquid photosensitive resin 23 in a designated area. And after the solidification is finished, taking the solidified liquid photosensitive resin (namely the solidified model) out of the liquid containing device to finish printing the solidified model. In the printing process of each layer, the printing platform 22 is driven by the module 24 to descend to a designated position, the exposure mechanism 90 exposes once, the liquid photosensitive resin 23 between the printing platform 22 and the liquid containing device 211 is solidified, the module 24 drives the printing platform 22 to ascend, demoulding of the solidified layer is completed, and the next layer is ready for printing.

Because a vacuum area exists between the base plate and the elastic plate in the traditional technical scheme, higher adsorption force can be generated. The substrate and the elastic plate are separated, so that the substrate and the elastic plate are in a non-vacuum state, the release film and the elastic plate are easy to deform, and vacuum is broken between the release film and the elastic plate through the elastic modulus difference of the release film and the elastic plate. After the vacuum adsorption force is broken, the demolding force is obviously reduced, the time for printing the sheet layer is shorter, and the forming time of 3D printing is effectively shortened.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. A liquid containing device for 3D printing, comprising:

the elastic plate is arranged below the release film;

2. The liquid containing apparatus for 3D printing as claimed in claim 1, wherein:

the elastic plate, the substrate and the release film are transparent.

3. The liquid containing apparatus for 3D printing as claimed in claim 1, wherein:

the fixing structure comprises an annular frame and an annular bottom support, and the bottom support is arranged below the frame.

4. A liquid containing apparatus for 3D printing as claimed in claim 3, wherein:

the release film is fixed between the frame and the shoe.

5. The liquid containing apparatus for 3D printing as claimed in claim 4, wherein:

the frame constitutes the lateral wall of flourishing liquid device, flourishing liquid device passes through the collet is fixed on the base of 3D printer.

6. The liquid containing apparatus for 3D printing as claimed in claim 1, wherein:

a spacer is provided between the base plate and the elastic plate to form a gap between the base plate and the elastic plate.

7. The liquid containing apparatus for 3D printing as defined in claim 6, wherein:

the separator is an FEP break point type adhesive tape, and the thickness of the FEP break point type adhesive tape is 0.1-0.2 mm.

8. The liquid containing apparatus for 3D printing as claimed in claim 7, wherein:

the FEP breakpoint type adhesive tapes are arranged on the substrate in an array mode and are arranged at the edge position of the elastic plate on the projection surface of the substrate.

9. The liquid containing apparatus for 3D printing according to claim 7, wherein an arc-shaped protrusion is provided at an opposite middle region of the base plate and the elastic plate.

10. The liquid containing apparatus for 3D printing according to claim 1, wherein at least one of the surfaces of the elastic plate opposite to the substrate is a roughened surface.

11. The liquid containing apparatus for 3D printing as claimed in claim 1, wherein:

the elastic plate is made of one of the following glasses: soda lime glass, medium alumina glass, high alumina glass.

12. The liquid containing apparatus for 3D printing as claimed in claim 1, wherein:

the release film is made of one of the following materials: FEP, NFEP, TPX, AF2400 and 2400.

13. The liquid containing apparatus for 3D printing of claim 1, wherein the release film is a semi-permeable film.

14. The liquid containing apparatus for 3D printing as claimed in claim 1, wherein a PET film is attached to the elastic plate.

15. The 3D printer is characterized by comprising a printing platform, a liquid containing device, a mounting base, a module and an exposure mechanism;

the printing platform is driven by the module to move;

the liquid containing device is arranged on the mounting base;

the liquid containing device comprises:

the elastic plate is arranged below the release film;

16. The 3D printer of claim 15, wherein:

the elastic plate, the substrate and the release film are transparent.

17. The 3D printer of claim 15, wherein:

18. The 3D printer of claim 17, wherein:

the release film is fixed between the frame and the shoe.

19. The 3D printer of claim 18, wherein:

20. The 3D printer of claim 15, wherein: