CN110815818A

CN110815818A - 3D printing device, demolding method and liquid containing mechanism thereof

Info

Publication number: CN110815818A
Application number: CN201910740656.XA
Authority: CN
Inventors: 陈勇; 张靖; 金良; 谢建焕; 陈明
Original assignee: Zhejiang Xun Technology Co Ltd
Current assignee: Zhejiang Xun Technology Co Ltd
Priority date: 2018-08-14
Filing date: 2019-08-12
Publication date: 2020-02-21
Anticipated expiration: 2039-08-12
Also published as: CN110815818B

Abstract

The application discloses a 3D printing device, a demoulding method and a liquid containing mechanism thereof, and relates to the field of 3D printing, wherein the liquid containing mechanism comprises a material box base, a material box and a plurality of guide moving parts, the material box base is a rigid annular plate with a mounting groove and is detachably mounted on a base of the 3D printing device, the mounting groove of the material box base is covered by a transparent glass plate, and the glass plate is fixed on the upper surface of the material box base; the plurality of guide moving parts are fixed on the material box base in a dismountable way after being fixed with the peripheral edge of the material box; each guide motion part is a following part with an upper limit structure and a lower limit structure, the following parts are fixed with the peripheral edge of the material box, and the guide motion parts are used for enabling the material box to follow the printing mechanism for a certain distance between the upper limit structure and the lower limit structure so as to realize the demoulding of the film. The liquid containing mechanism can improve printing quality and reduce cost through the design of fixing the glass plate, separating and multi-section stripping, so that the thin film is not easy to deform.

Description

3D printing device, demolding method and liquid containing mechanism thereof

Technical Field

The application relates to the technical field of 3D printing, in particular to a 3D printing device and a demoulding method and a liquid containing mechanism thereof.

Background

3D printing is one of the rapid prototyping technologies, which is a technology for constructing an object by using an adhesive material such as powdered metal or plastic and the like and by using a digital model file as a base and by using a layer-by-layer printing mode, and the 3D printing is usually realized by using a digital technical material printer. The method is often used for manufacturing models in the fields of mold manufacturing, industrial design and the like, and is gradually used for directly manufacturing some products, and parts printed by the technology are already available.

The 3D printing is different from the printing of characters on a paper plane and the manufacturing of products in a traditional mode of milling and planing and the like, and is a series of technologies and methods for completing the manufacturing of articles in a three-dimensional layer-by-layer printing mode. The specific implementation mode is as follows: a computer three-dimensional design model is used as a blueprint, special materials such as metal powder, ceramic powder, plastics, cell tissues and the like are piled up layer by layer and bonded by means of laser beams, hot melting nozzles and the like through a software layering dispersion and numerical control forming system, and finally, an entity product is manufactured through overlaying forming.

Compared with the traditional manufacturing method, the 3D printing has many advantages, such as simplifying the process flow, manufacturing articles with complex space shapes, saving raw materials and the like. Therefore, 3D printing technology has been rapidly developed in recent years and applied to various fields, such as jewelry, footwear, industrial design, construction, engineering and construction, automobiles, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and others, and 3D printed articles have been made to reach deep into various fields of human life.

For example, chinese patent publication No. CN205685751U discloses a 3D printer, which includes a frame 10 and a resin box 20 disposed on the frame 10, as shown in fig. 1 and 2, the 3D printer includes an optical system and a light source disposed below the resin box 20, light emitted from the light source is emitted to the bottom of the resin box 20 through the optical system, and a printing head is disposed at the top end of the resin box 20.

This resin box 20 includes the bottom plate 201 by the aluminum plate preparation and sets up in the box body 202 on bottom plate 201 top, and the lower extreme four corners of box body 202 is equipped with four nut posts, is equipped with the counter sink 2011 that supplies the nut post to peg graft on bottom plate 201, and the lower extreme of bottom plate 201 is equipped with from upwards passing screw 203 of pegging graft in the nut post behind counter sink 2011, and screw 203 threaded connection is in the nut post, fixes resin box 20 on frame 10.

Typically, a transparent projection glass is placed in the resin case 20, and the printed film is placed in the case body 202.

However, in the prior art, the projection glass may not be tightly fixed, and the position may be easily moved, which may cause problems such as a change in distance and focal length, and may result in low printing accuracy.

In the printing process, due to the problem of vacuum adsorption force, the technical problems of large stripping sound, easy deformation of the film, short service life of the film and the like occur.

Moreover, because the existing resin box is designed in an integral way, the universality is poor, the resin box needs to be replaced in time after being damaged, the use cost is increased, and the problems of time and labor waste, high installation and operation requirements and the like exist because the resin box needs to be calibrated after being replaced with a new resin box.

Accordingly, those skilled in the art have made efforts to develop a 3D printing apparatus that can improve 3D printing quality, make a film less likely to be deformed, reduce cost, simplify mounting operations, and improve mounting calibration speed.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present application includes at least one of: poor 3D printing quality, easy deformation of the film, high cost and high installation operation requirements.

In order to achieve the above object, an aspect of the present application provides a 3D printing apparatus, including a base, a printing mechanism, a liquid containing mechanism, and an exposure mechanism, wherein the printing mechanism is located above the liquid containing mechanism, and the exposure mechanism is located below the liquid containing mechanism;

the liquid containing mechanism comprises a material box base, a material box and a plurality of guiding moving parts, wherein the material box is detachably arranged on the material box base through the plurality of guiding moving parts, and the upper part of the material box is opposite to the printing mechanism in a spaced manner;

the liquid containing mechanism also comprises a light-transmitting glass plate, the material box base is a rigid annular plate with a mounting groove and is detachably mounted on the base, the mounting groove of the material box base is covered by the glass plate, and the glass plate is fixed on the upper surface of the material box base;

the plurality of guide motion components are fixed with the peripheral edge of the material box and then detachably fixed on the material box base, and the material box is arranged on the glass plate;

the glass plate is used for placing a film on the upper surface of the glass plate in the material box;

each guiding motion part is a following part with an upper limit structure and a lower limit structure;

the printing mechanism is used for moving upwards during demoulding and pulling the printing object through the adsorption force between the film and the printing object so as to drive the material box to move together;

the plurality of guide motion components are used for enabling the material box to realize the stripping of the film after the material box follows the printing mechanism for a certain distance between the upper limit structure and the lower limit structure.

Optionally, each guiding motion component comprises a guiding rod, an upper spring, a lower spring, an upper spring adjusting piece and a lower spring adjusting piece, wherein the upper spring adjusting piece is of the upper limiting structure, and the lower spring adjusting piece is of the lower limiting structure;

the guide rod penetrates through the peripheral edge of the material box and then is fixed on the material box base;

the upper spring is sleeved on the part of the guide rod, which is positioned on the upper surface of the material box, the upper spring adjusting piece is adjustably fixed with the guide rod and is positioned on the upper spring, and the upper spring is abutted against the upper surface of the material box through the upper spring adjusting piece;

the lower spring is sleeved on the part of the guide rod below the lower surface of the material box, the lower spring adjusting piece is adjustably fixed with the guide rod and is located below the lower spring, and the lower spring is abutted to the lower surface of the material box through the lower spring adjusting piece.

Optionally, a raised stop structure is further provided on the guide bar and above the upper spring adjustment member.

Optionally, the 3D printing device further comprises an adjusting rod and an adjusting spring, the upper surface of the base is provided with a plurality of support columns, the material box base is detachably fixed on the support columns through the adjusting rod, the adjusting rod is sleeved with the adjusting spring, and two ends of the adjusting spring respectively abut against the upper surface of the support columns and the lower surface of the material box base.

Optionally, the top surface of the support column and the bottom end of the material box base are respectively provided with an adjusting hole matched with the adjusting rod, wherein the adjusting hole of the material box base is a through hole, the inner side surface of the adjusting hole on the top surface of the support column is provided with a thread, and the adjusting rod penetrates through the through hole and then is fixed with the adjusting hole of the support column.

Optionally, the guided motion component is a pneumatic component, a hydraulic component, or an electric component.

Another aspect of the present application provides a liquid containing mechanism in a 3D printing device, the liquid containing mechanism being located above a base included in the 3D printing device and below a printing mechanism included in the 3D printing device;

Optionally, the upper surface of the base is provided with a plurality of support columns, the material box base is detachably fixed on the support columns through adjusting rods included in the 3D printing device, adjusting springs are sleeved on the outer sides of the adjusting rods, and two ends of each adjusting spring respectively abut against the upper surfaces of the support columns and the lower surface of the material box base.

Another aspect of the present application provides a demolding method for a 3D printing apparatus, where the 3D printing apparatus includes a base, a printing mechanism, a liquid containing mechanism, and an exposure mechanism, where the printing mechanism is located above the liquid containing mechanism, and the exposure mechanism is located below the liquid containing mechanism;

the demoulding method comprises the following steps:

when the film is removed, the printing mechanism moves upwards and pulls the printing object through the adsorption force between the film and the printing object so as to drive the material box to move together;

the material box realizes the stripping of the film after the upper limit structure and the lower limit structure follow the printing mechanism for a certain distance by the guide motion parts.

Optionally, the demolding method further comprises:

adding a predicted material into the material box, and before demoulding, keeping the upward elastic force of the lower spring + the self weight of the material box + the weight of the predicted material as the downward elastic force of the upper spring so as to enable the film to be placed on the upper surface of the glass plate to be in a close state and have an adsorption force between the upper spring and the glass plate;

when the film is removed, the printing mechanism moves upwards to overcome the adsorption force, when the printing object is pulled, the film and the glass plate start to be slowly separated, oxygen enters between the film and the glass plate, the film removal between the film and the glass plate in the first stage is realized, at the moment, the adsorption force exists between the film and the printing object, the downward elastic force of the upper spring + the gravity of the material box + the gravity of the expected material is less than the upward elastic force of the lower spring + the upward force of the printing mechanism;

the upper spring and the lower spring drive the material box to move upwards for a certain distance along with the printing mechanism until the downward elastic force of the upper spring, the gravity of the material box and the estimated gravity of the material are greater than the upward elastic force of the lower spring and the upward force of the printing mechanism, the film and the glass plate are completely separated, and the film separation between the film and the printed object in the second stage is realized.

According to the 3D printing device, the demoulding method and the liquid containing mechanism, the material box and the material box base are arranged in a separated mode, the installation size of a designed projection surface cannot be influenced when the material box is replaced, the universality of the material box is guaranteed, and the manufacturing cost for replacing the material box can be reduced. Through fixing the glass board on this material box base, can guarantee all the time that the glass board is motionless printing the in-process, can improve 3D printing device's 3D and print precision and quality. The material box is connected with the material box base through the guide motion part, and the guide motion part enables the material box to follow the printing mechanism for a certain distance between the upper limit structure and the lower limit structure, so that sectional type demoulding can be realized, the deformation of the film in the demoulding process is reduced, the sound in the demoulding process is reduced, and the service life of the film is prolonged.

The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.

Drawings

FIG. 1 is a schematic structural diagram of a 3D printer in the prior art;

FIG. 2 is a schematic diagram of a prior art resin cartridge of the 3D printer of FIG. 1;

fig. 3 is a schematic structural diagram of a 3D printing apparatus according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a liquid containing mechanism of the 3D printing device of FIG. 3;

fig. 5 is a schematic cross-sectional structure view of a combination of a material box base and a material box of another 3D printing apparatus according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of another 3D printing apparatus according to another embodiment of the present application;

fig. 7 is a top view of a print arm of the 3D printing device of fig. 6;

FIG. 8 is a sectional view taken along line A-A of FIG. 7;

fig. 9 is a schematic perspective view of a printing arm of the 3D printing apparatus of fig. 6;

FIG. 10 is an exploded view of the magnetic feature configuration in the print arm of FIG. 9;

FIG. 11 is a view showing the installation of the rotation shaft, the electromagnetic cover plate, and the stop lever in the print arm of FIG. 9;

fig. 12 is a schematic perspective view of a platform assembly of the 3D printing apparatus of fig. 6;

fig. 13 is an enlarged partial cross-sectional structural schematic view of the material box base in fig. 6 respectively combined with the base and the material box;

FIG. 14 is an enlarged view of area B of FIG. 6;

fig. 15 is a schematic process diagram of a 3D printing apparatus demolding method according to another embodiment of the present disclosure.

Detailed Description

The technical contents of the preferred embodiments of the present application will be more clearly and easily understood by referring to the drawings attached to the specification. The present application may be embodied in many different forms of embodiments and the scope of the present application is not limited to only the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the size and thickness of each component are not limited in the present application. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

As shown in fig. 3 to 4, a 3D printing apparatus according to an embodiment of the present disclosure includes a printing mechanism 36 and a liquid containing mechanism 37 mounted on a base 35, where the printing mechanism 36 is located above the liquid containing mechanism 37, and the liquid containing mechanism 37 is located on the base 35.

This liquid containing mechanism 37 includes material box base 371 and material box 372, and this material box 372 is bottomless basin, and the shape can be circular basin, square basin or rectangle basin, and this application does not restrict, and this material box 372 can be through a plurality of direction moving part 38 demountable installation on this material box base 371, and this material box 372's top is spaced apart to be faced to this printing mechanism 36.

For example, the base 35 has a plurality of upward bracket columns 350, the material box base 371 is detachably fixed on the bracket columns 350 through an adjusting rod 351, an adjusting spring 352 is sleeved outside the adjusting rod 351, and two ends of the adjusting spring 352 respectively abut against the upper surfaces of the bracket columns 350 and the lower surface of the material box base 371. The adjusting rod 351 may be a screw or a bolt.

Adjusting holes (not shown) matched with the adjusting rods 351 are respectively formed in the top end surface of the support column 350 and the bottom end of the material box base 371, wherein the adjusting holes of the material box base 371 are through holes, threads are formed in the inner side surface of the adjusting holes in the top end surface of the support column 350, and the adjusting rods 351 are fixed with the adjusting holes of the support column 350 after penetrating through the through holes.

The liquid containing mechanism 37 further comprises a transparent glass plate, the material box base 371 is a rigid annular plate with a mounting groove, the mounting groove of the material box base 371 is covered by the glass plate, the glass plate is fixed on the upper surface of the material box base 371, and the material box 372 is arranged on the glass plate. For example, the glass plate is fixed on the upper surface of the material box base 371 by fixing glue at the periphery of the glass plate, for example, the fixing glue may be AB glue. The size and shape of the glass plate may be determined according to the size and shape of the material box 372.

The guiding moving parts 38 are detachably fixed to the material cassette base 371 after being fixed to the peripheral edge of the material cassette 372. For example, each guided movement element 38 is a follower element with an upper limit formation and optionally a lower limit formation, which is secured to the peripheral edge of the material cassette 372.

The printing mechanism 36 is used for moving upwards during stripping and pulling the printing object through the adsorption force between the film and the printing object so as to drive the material box 372 to move together; the plurality of guide movement members 38 are adapted to cause the material cartridge 372 to follow the printing mechanism a distance between the upper and lower limit configurations to effect stripping of the film.

For example, the plurality of guided motion components 38 are spring components, pneumatic components, hydraulic components, or electric components with an upper limit structure and optionally with a lower limit structure.

For example, the guiding moving parts 38 include a guiding rod 381, an upper spring 382, a lower spring 383, and an upper spring adjuster, the upper limiting structure being the upper spring adjuster, for example, the upper spring adjuster may be a nut, the lower limiting structure may be directly the material cartridge base 371, or a lower spring adjuster, for example, a nut.

The guiding rod 381 passes through the peripheral edge of the material box 372 and is fixed on the material box base 371.

The upper spring 382 is sleeved on the portion of the guide rod 381 above the upper surface of the material box 372, the upper spring adjusting member is adjustably fixed with the guide rod 381, the upper spring adjusting member is located above the upper spring 382, and the upper spring 382 is pressed against the upper surface of the material box 372 through the upper spring adjusting member.

The lower spring 383 is sleeved on the part of the guide rod 381 below the lower surface of the material box 372, and when the lower limit structure is the lower spring adjusting piece, the lower spring adjusting piece is adjustably fixed with the guide rod 381 and is located below the lower spring 383, and the lower spring 383 is abutted against the lower surface of the material box 372 through the lower spring adjusting piece; when the lower limiting structure is directly the material box base 371, the lower spring 383 abuts between the upper surface of the material box base 371 and the lower surface of the material box 372.

A raised stop structure (not shown) is also provided on the guide rod 381 above the upper spring adjustment member.

The film 39 can be a teflon film by stretching a film tool and placing the film 39 on the upper surface of the glass plate in the material box 372 by using a pressing ring 373, and the film 39 and the glass plate generate adsorption force to be adsorbed together.

After the material box 372 is filled with the expected material and before demoulding, the upward elastic force of the lower spring 383 + the self weight of the material box 372 + the weight of the expected material is kept equal to the downward elastic force of the upper spring 382, so that the film 39 is placed on the upper surface of the glass plate in a tight state. When the printing platform moves upwards to overcome the adsorption force during stripping, when the printing object is pulled, the upper spring 382 is compressed to generate downward stress, the lower spring 383 is elongated to reduce the upward elastic force, namely, the balance of the above equation is broken, so that the film 39 and the glass plate start to separate slowly, oxygen enters between the film 39 and the glass plate, and the stripping between the film and the glass plate in the first stage is realized. At this time, there is an adsorption force between the film and the print object, and the downward elastic force of the upper spring 382 + the self weight of the material box 372 and the expected gravity of the material are less than the upward elastic force of the lower spring 383 + the upward force of the print platform, so that the material box 372 will move upward a distance along with the print platform until the downward elastic force of the upper spring 382 + the gravity of the material box 372 + the expected gravity of the material > the upward elastic force of the lower spring 383 + the upward force of the print platform, the film 39 and the glass plate are completely separated, and the second stage of film release between the film and the print object is realized. After the second stage of stripping is completed, the printing platform continues to move upward to a predetermined film-drawing height (e.g., 6-10 millimeters (mm), such as 8 mm), completing a layer of printing process.

The amount of adsorption force generated by the stripping during printing is primarily dependent on the amount of oxygen permeability to the film, since oxygen can prevent the material from curing. In the first stage, the film and the glass plate are subjected to demoulding, and simultaneously, oxygen gradually permeates through the film to enter the upper part of the resin box along with the separation of the film and the glass plate and is attached to the contact surface of the material on the film. Through the sectional stripping, the existence of oxygen is always ensured on the contact surface of the film and the material, so that the stripping sound is small, and the service life of the film is prolonged.

Therefore, in the first and second-stage stripping processes, the material box can follow the printing mechanism for a certain distance to realize multi-stage stripping due to the elastic action of the upper spring and the lower spring, so that the film is prevented from being easily torn. Through sectional type demoulding, the deformation of the film in the demoulding process is reduced, the sound in the demoulding process is reduced, and the service life of the film is prolonged. Furthermore, the material box and the material box base are arranged in a separated mode, the installation size of a designed projection surface cannot be influenced when the material box is replaced, the universality of the material box is guaranteed, and the manufacturing cost for replacing the material box can be reduced. When the film is removed, the material box can move up and down along with the printing platform, and 3D printing of different layers is realized. Through fixing the glass board on this material box base, can guarantee all the time that the glass board is motionless, the plane of projection is motionless promptly printing the in-process, consequently, can improve 3D printing device's 3D and print precision and quality. In addition, the upper part of the material box is not provided with a projection surface, and the requirement on the flatness is extremely low.

In another embodiment of the present application, the material box 372 may not be connected to the material box base 371 through the guiding movement component 38, but the material box 372 is detachably fixed to the material box base 371 through the first buckle 57 and the second buckle 58, as shown in fig. 5, which is a schematic cross-sectional structure diagram of a combination of the material box base and the material box of another 3D printing apparatus according to another embodiment of the present application. A transparent glass plate 62 is fixed on the material box base 371, for example, the glass plate 62 is fixed on the upper surface of the material box base 371 by fixing glue at the periphery of the glass plate 62, for example, the fixing glue may be AB glue. Then, the material box 372 is located on the glass plate 62 and detachably fixed with the material box base 371 through the first buckle 57 and the second buckle 58.

The film 39 can be a teflon film by stretching a film tool and placing the film 39 on the upper surface of the glass plate 62 in the material box 372 by using a pressing ring 59, and the film 39 and the glass plate 62 are adsorbed together by generating adsorption force.

Therefore, the material box and the material box base are arranged in a separated mode, the installation size of a designed projection surface cannot be influenced when the material box is replaced, the universality of the material box is guaranteed, and the manufacturing cost for replacing the material box can be reduced.

The material box and the material box base are arranged in a separated mode, the installation size of a designed projection surface cannot be influenced when the material box is replaced, the universality of the material box is guaranteed, and the manufacturing cost for replacing the material box can be reduced. When the film is removed, the material box can move up and down along with the printing platform, and 3D printing of different layers is realized. Through fixing the glass board on this material box base, can guarantee all the time that the glass board is motionless, the plane of projection is motionless promptly printing the in-process, consequently, can improve 3D printing device's 3D and print precision and quality. In addition, the upper part of the material box is not provided with a projection surface, and the requirement on the flatness is extremely low.

As shown in fig. 6, fig. 6 is a schematic structural diagram of another 3D printing apparatus according to another embodiment of the present disclosure, where the 3D printing apparatus includes a printing mechanism 2, a liquid containing mechanism 3, and an exposure mechanism 4 mounted on a base 1, where the printing mechanism 2 is located above the liquid containing mechanism 3, and the exposure mechanism 4 is located below the liquid containing mechanism 3.

The printing mechanism 2 comprises a module 23 and a printing platform slidably mounted on the module 23, wherein the module 23 is vertically mounted on the base 1 and has a sliding groove capable of sliding up and down.

The printing platform comprises a printing arm 21 and a platform component 22 which is detachably mounted on the printing arm 21, the platform component 22 and the printing arm 21 are fixed through attraction of a magnetic part, the other end of the printing arm 21 is mounted in the sliding groove of the module 23, and the printing platform can slide up and down along the sliding groove through the printing arm 21.

The liquid containing mechanism 3 comprises a material box base 31 and a material box 32 which is detachably mounted on the material box base 31, the material box base 31 is horizontally mounted on the base 1, and the upper part of the material box 32 faces the printing mechanism 2 in an empty mode, namely faces the platform assembly 22 in an empty mode. The material box 32 is a bottomless basin, and may be a circular basin, a square basin or a rectangular basin, but the present application is not limited thereto.

In another embodiment of the present application, the liquid containing mechanism 3 further comprises a transparent glass plate 34, and the material box base 31 is a rigid annular plate with a mounting groove, such as a glass annular plate, a plastic annular plate and a metal annular plate, such as an aluminum annular plate and an aluminum alloy annular plate. The installation groove in the middle of the material box base 31 faces the bottom of the material box 32, the size and the shape of the installation groove are determined according to the size and the shape of the bottom of the material box 32, optionally, the area of the installation groove is larger than or equal to the area of the bottom of the material box 32, so that the light emitted by the exposure mechanism 4 can enter the material box 32 through the installation groove.

The glass plate 34 is fixedly installed on the material box base 31 and covers the installation groove of the material box base 31, and the material box 32 is arranged on the glass plate 34.

In another embodiment of the present application, the material cassette base 31 and the material cassette 32 are detachably fixed to each other at their peripheries by a plurality of guide moving members 5, for example, three or four or more guide moving members 5, and the material cassette 32 is fixed to the material cassette base 31 at four corners of its periphery by four guide moving members 5. In another embodiment of the present application, the material box 32 may be any other shape, for example, the overall shape of the material box 32 may be a cylinder.

The guiding moving members 5 are fixed to the peripheral edge of the material box 32 and then detachably fixed to the material box base 31, for example, the guiding moving members 5 penetrate through the peripheral edge of the material box 32 and then detachably fixed to the material box base 31, and each guiding moving member 5 is a following member having an upper limit structure and a lower limit structure, and the following member is fixed to the peripheral edge of the material box 32.

The printing mechanism 2 is used for moving upwards during demoulding and pulling the printing object through the adsorption force between the film and the printing object so as to drive the material box 32 to move together; the guiding movement components 5 are used for enabling the material box 32 to realize the stripping of the film 39 after a certain distance is formed between the upper limit structure and the lower limit structure along with the printing mechanism 2.

In another embodiment of the present application, the bottom edge of the material box 32 is further provided with a heating ring, and the printing solution can be heated by the heating ring, so that the printing solution cannot freeze even at low temperature. The heating ring is generally tightly attached around the bottom of the material box 32, and heating wires, thermistors and the like can be adopted.

As shown in fig. 6, the exposure mechanism 4 is located below the material box base 31 and is installed on the base 1, and the pattern light source emitted from the exposure opening 411 of the exposure mechanism 4 is directly emitted or reflected to the bottom of the material box 32. For example, the exposure mechanism 4 includes a projector 41 and a reflector 42, and a pattern light source emitted from an exposure port 411 of the projector 41 is reflected by the reflector 42, passes through a mounting groove of the material box base 31, and then is emitted to the bottom surface (i.e., the molding surface) of the stage assembly 22 through the glass plate 34 and the material box 32.

The base 1 is provided with a control screen (not shown), the control screen is connected with a control module (not shown) of the 3D printing device, specifically, a touch screen can be adopted, man-machine interaction can be achieved through the touch screen, and the printing process is more convenient and intelligent.

In this embodiment, as shown in fig. 7 to 11, the print arm 21 includes a print arm body 211, a connection end 2111 of the print arm body 211 is movably mounted on the module 23 of the 3D printing apparatus, a free end 2112 of the print arm body 211 is provided with a magnetic component 212, the magnetic component 212 includes a first magnet 2121 and a second magnet 2122 which are arranged up and down, a control switch 2123 is connected to the first magnet 2121 through a rotation shaft 2124, and the first magnet 2121 rotates along with the rotation of the control switch 2123.

In this embodiment, the first magnet 2121 is a strong magnet, and the second magnet 2122 is a weak magnet. The first magnet 2121 and the second magnet 2122 are vertically disposed in the magnet slot 213, wherein the second magnet 2122 located at the lower portion is fixedly installed in the magnet slot 213, i.e., the second magnet 2122 does not rotate with the rotation of the control switch 2123. The first magnet 2121 is movably mounted in the magnet slot 213, and in order to facilitate the rotation of the first magnet 2121, a certain distance may be left between the first magnet 2121 and the second magnet 2122, that is, the depth of the magnet slot 213 is greater than the sum of the thicknesses of the first magnet 2121 and the second magnet 2122. A cover plate 214 is fixedly mounted on the magnet slot 213 near the control switch 2123, and the cover plate 214 is used for covering the first magnet 2121 and preventing the first magnet 2121 from popping out of the magnet slot 213 when like poles repel each other, and is used for controlling the rotation angle of the first magnet 2121. The specific setting manner of the cover plate 214 controlling the rotation angle of the first magnet 2121 is as follows: the cover plate 214 is provided with a counter bore 2141 on the side close to the first magnet 2121, and a through hole 2142 for the rotation shaft 2124 to pass through is formed in the middle of the counter bore 2141. The counterbore 2141 is formed by a large diameter arc 2141a and a small diameter arc 2141 b; the bottom of the rotation shaft 2124 is provided with a limiting rod 2125, two ends of the limiting rod 2125 are respectively provided with 1 connecting

post

2125a and 2125b facing the first magnet 2121, the connecting

posts

2125a and 2125b are respectively placed in 2 connecting holes 2121a and 2121b of the first magnet 2121, the main body of the limiting rod 2125 is installed in a groove 2124a penetrating through the bottom of the rotation shaft 2124, the rotation shaft 2124 is rotated, and the limiting rod 2125 drives the first magnet 2121 to rotate. The distance from the connecting post 2125a of the limiting rod 2125 away from the rotating shaft 2124 to the rotating shaft 2124 is smaller than the radius of the large diameter arc 2141a but larger than the radius of the small diameter arc 2141b, so that the rotation angle of the limiting rod 2125 can be limited, and the first magnet 2121 can be controlled to rotate within the set angle in the magnet groove 213, thereby preventing over-rotation. To facilitate the rotation of the first magnet 2121, the 2 connection holes 2121a and 2121b of the first magnet 2121 are eccentrically disposed, i.e., the stopper 2125 is not disposed at the central region of the first magnet 2121.

The working principle of the magnetic component 212 is as follows: when the control switch 2123 is turned on, the same ends of the first magnet 2121 and the second magnet 2122 disposed above and below have the same polarity, and at this time, according to the principle that like poles repel each other, the first magnet 2121 and the second magnet 2122 repel each other above and below, and only the second magnet 2122 of the whole magnetic component 212 generates magnetism, that is, the magnetic component 212 is in a weak magnetic state. When the control switch 2123 is turned to the closed state, the same ends of the first magnet 2121 and the second magnet 2122 disposed above and below have different polarities, and at this time, according to the principle of opposite attraction, the first magnet 2121 and the second magnet 2122 attract each other above and below, and the magnetism of the entire magnetic component 212 is generated by the first magnet 2121 and the second magnet 2122, and at this time, the magnetic component 212 is in a strong magnetic state.

As shown in fig. 12, fig. 12 is a schematic perspective view of a platform assembly of the 3D printing apparatus of fig. 6, the platform assembly 22 includes a housing 221, an accommodating cavity 222 is provided on the housing 221 for the free end 2112 of the printing arm body to extend into, a magnetic metal 223 is provided at the bottom of the accommodating cavity 222 and corresponds to the bottom of the second magnet 2122, and the magnetic metal 223 may be an iron sheet or other metal capable of being attracted.

In order to ensure the precise mounting of the printing arm 21 and the platform assembly 22, the printing arm body 211 is provided with at least 3 positioning holes 215, and the accommodating cavity 222 is provided with elastic positioning columns corresponding to the positioning holes 215 one to one. The positioning post comprises a point location bead and an elastic piece, and the elastic piece enables the positioning bead to be elastically embedded in the positioning hole 215.

A U-shaped groove 225 into which the rotating shaft 2124 moves is further provided above the receiving chamber 222. The platform assembly housing 221 has an integral print table 224 at its lower end. The printing table 224 with an integrated structure facilitates printing and avoids liquid seepage.

The printing arm 21 and the platform assembly 22 of the 3D printing platform are fixed through the magnetic part 212 in an attracting mode, and the 3D printing platform is convenient to install and detach. In operation, the free end 2112 of the printing arm body 211 extends into the accommodating cavity 222 of the platform assembly 22, and the positioning hole 215 and the positioning post are aligned accurately. Then, the control switch 2123 is turned to make the same end of the first magnet 2121 and the same end of the second magnet 2122 have different polarities through the rotation shaft 2124, and the two magnets attract each other to generate a strong attraction force, so as to attract the magnetic metal member 223 at the bottom of the accommodating cavity 222, thereby stably mounting the platform assembly 22 on the printing arm 21. When it is desired to remove the platform assembly 22 from the print arm 21, the attraction between the first magnet 2121 and the second magnet 2122 is reduced by rotating the control switch 2123, so that the platform assembly 22 is quickly removed from the print arm 21.

In addition to the structure of the above embodiment, the magnetic member may also be an electromagnet instead of a common magnet. For example, the printing arm 21 includes a printing arm body 211, a connection end 2111 of the printing arm body 211 is movably mounted on the module 23 of the 3D printing apparatus, a free end 2112 of the printing arm body is provided with a magnetic component 212, and the magnetic component 212 includes an electromagnet and a control switch for controlling the electromagnetic property; the electromagnet is connected with a power supply, the control switch controls the on-off of the electromagnet power supply, when the electromagnet is switched on (namely, the electromagnet power supply is switched off), the electromagnet is nonmagnetic, and when the electromagnet is switched off (namely, the electromagnet power supply is switched on), the electromagnet is in a strong magnetic state. The magnetic attraction between the platform assembly 22 and the print arm 21 is achieved by an electromagnet.

In this embodiment, the detachable mounting manner of the material box base 31 and the material box 32 may be as follows.

As shown in fig. 13, which is a schematic view of a partial cross-sectional enlarged structure of the material box base in fig. 6 respectively combined with a base and a material box, with reference to fig. 6 and 13, the material box base 31 is a rigid annular plate with a mounting groove, and is detachably mounted on the base 1, for example, the base 1 has a plurality of upward support columns 11, for example, three or four support columns 11, respectively located at the periphery of the base 1, and optionally, in this embodiment, four support columns 11 are taken as an example for description, and then four support columns 11 are located at four corners of the base 1.

This material box base 31 is through adjusting 12 detachably fixes on this support post 11, for example, this regulation pole 12 can be screw or bolt, this support post 11 top surface and this material box base 31 bottom seted up respectively with this regulation pole 12 complex regulation hole, wherein, this material box base 31's regulation hole can be the through-hole, the regulation downthehole surface of this support post 11 top surface has the screw thread, the regulation hole on this support post 11 top surface is the screw hole promptly, this regulation pole 12 passes behind this through-hole again with this support post 11's regulation hole fixed. For example, one end of the adjusting rod 12 is installed in an adjusting hole of the material box base 31, the other end of the adjusting rod 12 is installed in an adjusting hole at the top end of the support column 11, and the adjusting rod 12 can be rotated to drive the material box base 31 to be adjusted downward by a certain distance. In this embodiment, one or more or all of the adjusting rods 12 around the material box base 31 may be adjusted to keep the material box base 31 at a horizontal position, for example, a horizontal bubble (not shown) may be disposed on the upper surface of the material box base 31.

In another embodiment of the present application, the adjusting rod 12 is sleeved with an adjusting spring 13, two ends of the adjusting spring 13 respectively abut against the upper surface of the support column 11 and the lower surface of the material box base 31, and the parallelism between the bottom surface of the whole material box 32 and the bottom surface (i.e. the molding surface) of the printing table 224 is adjusted by adjusting the up-and-down movement of one or more or all of the adjusting rods 12, so as to ensure that the thickness of the printing layer is completely consistent.

As shown in fig. 13, the mounting groove of the material box base 31 is covered by a transparent glass plate 34, and the glass plate 34 is fixed on the upper surface of the material box base 31, for example, the glass plate 34 is fixed on the upper surface of the material box base 31 by fixing glue at the periphery of the glass plate 34, for example, the fixing glue may be AB glue. The size and shape of the glass plate 34 may be determined according to the size and shape of the material box 32.

The combination of the material box base 31 and the material box 32 can be as shown in fig. 6, 13 and 14, wherein fig. 14 is an enlarged view of the area B in fig. 6, the following component includes a guide rod 50, an upper spring 51, a lower spring 52, an upper spring adjusting member 53 and a lower spring adjusting member 54, the upper limiting structure is the upper spring adjusting member 53, and the lower limiting structure is the lower spring adjusting member 54.

The guide rod 50 passes through the peripheral edge of the material box 32 and then is fixed on the material box base 31. For example, the edge of the material box 32 has an outward (e.g., horizontally outward) fixing plate 33, wherein the fixing plate 33 may be an outward extending edge of the material box 32, that is, the fixing plate 33 is a part of the material box 32, and may be integrally formed. In another embodiment of the present application, the fixing plate 33 may be a single fixing plate, and the fixing plate 33 is fixed to the upper edge of the material box 32, for example, by bolts or welding. The upper surface of the material box base 31 is provided with a fixing hole, the position of the fixing plate 33 corresponding to the fixing hole is provided with a through hole, the guide rod 50 passes through the through hole of the fixing plate 33 and then is fixed in the fixing hole on the upper surface of the material box base 31, for example, the fixing hole can be a threaded hole, and the fixing end of the guide rod 50, which is used for fixing with the material box base 31, is provided with a thread matched with the thread of the threaded hole.

To further fix the guide rod 50, the guide rod 50 may also be fixed on the material box base 31 through a nut 56, for example, the nut 56 is located on the upper surface of the material box base 31 to fix the guide rod 50 on the material box base 31, or the nut 56 is located on the lower surface of the material box base 31 to fix the guide rod 50 on the material box base 31, or two nuts 56 are located on the upper surface and the lower surface of the material box base 31 respectively to fix the guide rod 50 on the material box base 31, which is not limited in this embodiment.

The upper spring 51 is sleeved on the part of the guide rod 50 above the upper surface of the material box 32, the upper spring adjusting piece 53 is adjustably fixed with the guide rod 50, the upper spring adjusting piece 53 is positioned on the upper spring 51, and the upper spring 51 is abutted against the upper surface of the material box 32 through the upper spring adjusting piece 53. For example, the upper spring 51 is sleeved on the portion of the guide rod 50 above the fixing plate 33, and the upper spring adjusting member 53 adjustably fixed to the guide rod 50 is disposed at the top end of the upper spring 51, and the upper spring 51 is pressed against the upper surface of the fixing plate 33 by the upper spring adjusting member 53. The upper spring adjusting member 53 may be a nut, and the guide bar 50 is provided with a screw thread to be engaged with the upper spring adjusting member 53 corresponding to the upper spring adjusting member 53.

In order to limit the up-and-down adjustment range of the upper spring adjusting member 53 and prevent the upper spring adjusting member 53 from being loosened, a protruding stop structure 55 is further disposed on the guide rod 50 and above the upper spring adjusting member 53, for example, the stop structure 55 is disposed on the top of the guide rod 50, for example, the stop structure 55 is a circular ring with a diameter larger than that of the guide rod 50, and the stop structure 55 can be either integrally formed with the guide rod 50 or fixed to the guide rod 50 by a screw thread.

The lower spring 52 is sleeved on the part of the guide rod 50 below the lower surface of the material box 32, the lower spring adjusting piece 54 is adjustably fixed with the guide rod 50, the lower spring adjusting piece 54 is positioned below the lower spring 52, and the lower spring 52 is abutted against the lower surface of the material box 32 through the lower spring adjusting piece 54. For example, the lower spring 52 is sleeved on the portion of the guide rod 50 below the fixing plate 33, that is, the lower spring 52 is located between the material box base 31 and the fixing plate 33, the lower end of the lower spring 52 is provided with the lower spring adjusting member 54 adjustably fixed with the guide rod 50, and the lower spring 52 is abutted against the lower surface of the fixing plate 33 through the lower spring adjusting member 54. The lower spring adjustor 54 may be a nut, and the guide bar 50 is provided with a screw thread to be engaged with the lower spring adjustor 54 corresponding to the lower spring adjustor 54.

By adjusting the up-down position of the upper spring adjusting member 53 and/or the lower spring adjusting member 54, the up-down position of the material box 32 can be adjusted and the material box 32 can be placed in a horizontal position.

In another embodiment of the present application, the specific calculation of the elastic forces of the upper spring 51 and the lower spring 52 can be calculated from the elastic coefficients of the springs, for example, the formula F ═ kx, where F is the elastic force of the spring, k is the elastic coefficient, and x is the deformation amount, by calculating that the sum of the downward elastic force of the upper spring 51, the gravity of the material cartridge 32, and the expected gravity of the material is equal to the upward elastic force of the lower spring 52, so that the film in the resin cartridge 3 is placed on the glass plate 34 in a close equilibrium state.

During printing, a film 39 is placed on the upper surface of the glass plate 34 in the material box 32 through a film stretching tool and a pressing ring, the film 39 can be a Teflon film, and the film 39 and the glass plate 34 are adsorbed together by generating adsorption force.

After the material box 32 is filled with the expected material and before the material box is stripped, the upward elastic force of the lower spring 52 + the self weight of the material box 32 + the weight of the expected material is equal to the downward elastic force of the upper spring 51, so that the film 39 is placed on the upper surface of the glass plate 34 in a tight state. When the film is stripped, the printing platform moves upwards to overcome the adsorption force between the film 39 and the printing object, the printing object is pulled to drive the material box 32 to move upwards for a certain distance, the upper spring 51 is compressed to generate downward stress, the lower spring 52 is elongated to reduce the upward elastic force, namely the balance of the above equation is broken, the film 39 and the glass plate 34 start to separate slowly, oxygen enters between the film 39 and the glass plate 34, and the first stage of stripping between the film and the glass plate 34 is realized. At this time, there is an adsorption force between the film and the print object, and the downward elastic force of the upper spring 51 + the gravity of the material box 32 + the expected material gravity < the upward elastic force of the lower spring 52 + the upward force of the print platform, so that the material box 32 will move upward a distance along with the print platform until the film 39 and the glass plate 34 are completely separated when the downward elastic force of the upper spring 51 + the gravity of the material box 32 + the expected material gravity > the upward elastic force of the lower spring 52 + the upward force of the print platform, and the second stage of film release between the film and the print object is realized. After the second stage of stripping is completed, the printing platform continues to move upward to a predetermined film-drawing height (e.g., 6-10 millimeters (mm), such as 8 mm), completing a layer of printing process.

Moreover, during the first and second stages of stripping, the risk of damaging the film due to too fast stripping can be avoided because the upper spring 51 and the lower spring 52 allow the material cartridge 32 to follow the printing mechanism 2 for a certain distance to achieve stripping of the film.

The guiding movement part 5 described in the above embodiments realizes multiple demoulding by the up-down spring, in another embodiment of the present application, the guiding movement part 5 may also be a pneumatic part, a hydraulic part or an electric part with an upper limit structure and a lower limit structure, and realizes multiple demoulding.

Another embodiment of the present application further provides a demolding method for a 3D printing apparatus, where the 3D printing apparatus includes a base 1, a printing mechanism 2, a liquid containing mechanism 3, and an exposure mechanism 4, where the printing mechanism 2 is located above the liquid containing mechanism 3, and the exposure mechanism 4 is located below the liquid containing mechanism 3.

The liquid containing mechanism 3 comprises a material box base 31, a material box 32 and a plurality of guiding moving parts 5, wherein the material box 32 is detachably mounted on the material box base 31 through the plurality of guiding moving parts 5, and the upper part of the material box 32 is opposite to the printing mechanism 2 in a spaced mode.

The liquid containing mechanism 3 further comprises a transparent glass plate 34, the material box base 31 is a rigid annular plate with a mounting groove and is detachably mounted on the base 1, the mounting groove of the material box base 31 is covered by the glass plate 34, and the glass plate 34 is fixed on the upper surface of the material box base 31.

The guiding moving parts 5 are fixed with the peripheral edge of the material box 32 and then detachably fixed on the material box base 31, and the material box 32 is arranged on the glass plate 34.

Each guiding movement part 5 is a following part with an upper limit structure and a lower limit structure.

The glass plate 34 is used to place a film on its upper surface within the material box 32.

The demoulding method comprises the following steps:

step 151, in the demoulding process, the printing mechanism 2 moves upwards and pulls the printing object through the adsorption force between the film and the printing object to drive the material box 32 to move together;

in step 152, the guiding moving members 5 enable the material box 32 to realize the film stripping after the material box follows the printing mechanism 2 for a certain distance between the upper limit structure and the lower limit structure.

Each of the guide moving parts 5 includes a guide lever 50, an upper spring 51, a lower spring 52, an upper spring adjusting piece 53, and a lower spring adjusting piece 54, the upper spring adjusting piece 53 being the upper limit structure, and the lower spring adjusting piece 54 being the lower limit structure.

The guide rod 50 passes through the peripheral edge of the material box 32 and then is fixed on the material box base 31.

The upper spring 51 is sleeved on the part of the guide rod 50 above the upper surface of the material box 32, the upper spring adjusting piece 53 is adjustably fixed with the guide rod 50, the upper spring adjusting piece 53 is positioned on the upper spring 51, and the upper spring 51 is abutted against the upper surface of the material box 32 through the upper spring adjusting piece 53.

The lower spring 52 is sleeved on the part of the guide rod 50 below the lower surface of the material box 32, the lower spring adjusting piece 54 is adjustably fixed with the guide rod 50, the lower spring adjusting piece 54 is positioned below the lower spring 52, and the lower spring 52 is abutted against the lower surface of the material box 32 through the lower spring adjusting piece 54.

In this embodiment, the material is added to the material box 32, and before the film is removed, the upward elastic force of the lower spring 52 + the self weight of the material box 32 + the weight of the material is kept equal to the downward elastic force of the upper spring 51, so that the film 39 is placed on the upper surface of the glass plate 34 in a close state with an adsorption force therebetween.

When the film is removed, the printing mechanism 2 moves upwards to overcome the adsorption force, when the printing object is pulled, the film 39 and the glass plate 34 start to separate slowly, oxygen enters between the film 39 and the glass plate 34, the film is removed between the film and the glass plate 34 in the first stage, at this time, the adsorption force exists between the film and the printing object, the downward elastic force of the upper spring 51 + the gravity of the material box 32 + the gravity of the expected material < the upward elastic force of the lower spring 52 + the upward force of the printing mechanism 2.

The upper spring 51 and the lower spring 52 drive the material box 32 to move upwards for a certain distance along with the printing mechanism 2, until the downward elastic force of the upper spring 51 + the gravity of the material box 32 + the expected gravity of the material > the upward elastic force of the lower spring 52 + the upward force of the printing mechanism 2, the film 39 and the glass plate 34 are completely separated, and the second stage of film stripping between the film and the printed object is realized.

In summary, the amount of adsorption force generated by stripping during printing is largely dependent on the amount of oxygen permeability to the film, since oxygen can prevent the material from curing. In the first stage, the film and the glass plate are subjected to demoulding, and simultaneously, oxygen gradually permeates through the film to enter the upper part of the resin box along with the separation of the film and the glass plate and is attached to the contact surface of the material on the film. Through the sectional stripping, the existence of oxygen is always ensured on the contact surface of the film and the material, so that the stripping sound is small, and the service life of the film is prolonged.

Therefore, this 3D printing device adopts the disconnect-type design, for example this material box and the separation setting of this material box base, can not influence the mounting dimension who designs the plane of projection when this material box is changed, and the commonality of this material box of assurance can reduce the manufacturing cost who changes this material box. When the film is removed, the material box can move up and down along with the printing platform, and 3D printing of different layers is realized. Through fixing the glass board on this material box base, can guarantee all the time that the glass board is motionless, the plane of projection is motionless promptly printing the in-process, consequently, can improve 3D printing device's 3D and print precision and quality. The material box is connected with the material box base through the guide motion part, the guide motion part enables the material box to follow the printing mechanism for a certain distance to realize film stripping, sectional type film stripping is realized, the deformation of the film in the film stripping process is reduced, the sound in the film stripping process is reduced, and the service life of the film is prolonged. In addition, the upper part of the material box is not provided with a projection surface, and the requirement on the flatness is extremely low.

The foregoing detailed description of the preferred embodiments of the present application. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the concepts of the present application should be within the scope of protection defined by the claims.

Claims

1. A3D printing device is characterized by comprising a base (1), a printing mechanism (2), a liquid containing mechanism (3) and an exposure mechanism (4), wherein the printing mechanism (2) is positioned above the liquid containing mechanism (3), and the exposure mechanism (4) is positioned below the liquid containing mechanism (3);

the liquid containing mechanism (3) comprises a material box base (31), a material box (32) and a plurality of guide moving parts (5), the material box (32) is detachably mounted on the material box base (31) through the plurality of guide moving parts (5), and the upper part of the material box (32) is opposite to the printing mechanism (2) in a spaced mode;

the liquid containing mechanism (3) further comprises a light-transmitting glass plate (34), the material box base (31) is a rigid annular plate with a mounting groove, the rigid annular plate is detachably mounted on the base (1), the mounting groove of the material box base (31) is covered by the glass plate (34), and the glass plate (34) is fixed on the upper surface of the material box base (31);

the guide moving parts (5) are fixed with the peripheral edge of the material box (32) and then detachably fixed on the material box base (31), and the material box (32) is arranged on the glass plate (34);

the glass plate (34) is used for placing a film on the upper surface of the glass plate in the material box (32);

each guide motion part (5) is a following part with an upper limit structure and a lower limit structure;

the printing mechanism (2) is used for moving upwards during stripping and driving the material box (32) to move together through the adsorption force between the film and a printing object;

the guide moving parts (5) are used for enabling the material box (32) to realize film stripping after a certain distance is formed between the upper limit structure and the lower limit structure along with the printing mechanism (2).

2. The 3D printing device according to claim 1, wherein each guiding movement part (5) comprises a guiding rod (50), an upper spring (51), a lower spring (52), an upper spring adjusting piece (53) and a lower spring adjusting piece (54), the upper spring adjusting piece (53) is the upper limit structure, and the lower spring adjusting piece (54) is the lower limit structure;

the guide rod (50) penetrates through the peripheral edge of the material box (32) and then is fixed on the material box base (31);

the upper spring (51) is sleeved on the part, located above the upper surface of the material box (32), of the guide rod (50), the upper spring adjusting piece (53) and the guide rod (50) are fixed in an adjustable mode, the upper spring adjusting piece (53) is located above the upper spring (51), and the upper spring (51) is abutted to the upper surface of the material box (32) through the upper spring adjusting piece (53);

the lower spring (52) is sleeved on the part, located below the lower surface of the material box (32), of the guide rod (50), the lower spring adjusting piece (54) is adjustably fixed with the guide rod (50), the lower spring adjusting piece (54) is located below the lower spring (52), and the lower spring (52) is abutted to the lower surface of the material box (32) through the lower spring adjusting piece (54).

3. 3D printing device according to claim 2, wherein a raised stop (55) is further provided on the guide bar (50) above the upper spring adjustment (53).

4. The 3D printing device according to any one of claims 1 to 3, wherein the 3D printing device further comprises an adjusting rod (12) and an adjusting spring (13), the upper surface of the base (1) is provided with a plurality of support columns (11), the material box base (31) is detachably fixed on the support columns (11) through the adjusting rod (12), the adjusting spring (13) is sleeved outside the adjusting rod (12), and two ends of the adjusting spring (13) respectively abut against the upper surface of the support columns (11) and the lower surface of the material box base (31).

5. The 3D printing device according to claim 4, wherein adjusting holes matched with the adjusting rods (12) are respectively formed in the top end surface of the support column (11) and the bottom end of the material box base (31), the adjusting holes of the material box base (31) are through holes, threads are formed in the inner side surface of the adjusting holes in the top end surface of the support column (11), and the adjusting rods (12) are fixed with the adjusting holes of the support column (11) after penetrating through the through holes.

6. The 3D printing device according to claim 1, wherein the guided motion component is a pneumatic component, a hydraulic component, or an electric component.

7. A liquid containing mechanism (3) in a 3D printing device, characterized in that the liquid containing mechanism (3) is located above a base (1) comprised by the 3D printing device and below a printing mechanism (2) comprised by the 3D printing device;

the printing mechanism (2) is used for moving upwards during stripping and pulling the printing object through the adsorption force between the film and the printing object so as to drive the material box (32) to move together;

8. The liquid containing mechanism (3) as claimed in claim 7, wherein each guiding movement part (5) comprises a guiding rod (50), an upper spring (51), a lower spring (52), an upper spring adjusting piece (53) and a lower spring adjusting piece (54), the upper spring adjusting piece (53) is the upper limit structure, and the lower spring adjusting piece (54) is the lower limit structure;

9. The liquid containing mechanism (3) as claimed in claim 8, characterized in that a raised stop (55) is provided on the guide rod (50) above the upper spring adjustment member (53).

10. The liquid containing mechanism (3) according to any one of claims 7 to 9, wherein the upper surface of the base (1) is provided with a plurality of support columns (11), the material box base (31) is detachably fixed on the support columns (11) through an adjusting rod (12) included in the 3D printing device, an adjusting spring (13) is sleeved outside the adjusting rod (12), and two ends of the adjusting spring (13) respectively abut against the upper surface of the support columns (11) and the lower surface of the material box base (31).

11. The liquid containing mechanism (3) according to claim 10, wherein the top end surface of the support column (11) and the bottom end of the material box base (31) are respectively provided with an adjusting hole matched with the adjusting rod (12), wherein the adjusting hole of the material box base (31) is a through hole, the inner side surface of the adjusting hole on the top end surface of the support column (11) is provided with a screw thread, and the adjusting rod (12) is fixed with the adjusting hole of the support column (11) after passing through the through hole.

12. Liquid containing mechanism (3) according to claim 7, characterized in that the guided movement means are pneumatic, hydraulic or electric.

13. The demolding method of the 3D printing device is characterized in that the 3D printing device comprises a base (1), a printing mechanism (2), a liquid containing mechanism (3) and an exposure mechanism (4), wherein the printing mechanism (2) is located above the liquid containing mechanism (3), and the exposure mechanism (4) is located below the liquid containing mechanism (3);

the demolding method comprises the following steps:

when the film is removed, the printing mechanism (2) moves upwards and pulls the printing object through the adsorption force between the film and the printing object to drive the material box (32) to move together;

the material box (32) is enabled to follow the printing mechanism (2) between the upper limiting structure and the lower limiting structure for a certain distance through the guide moving parts (5) to realize the stripping of the film.

14. The demolding method according to claim 13, wherein each guide moving part (5) comprises a guide rod (50), an upper spring (51), a lower spring (52), an upper spring adjusting piece (53) and a lower spring adjusting piece (54), wherein the upper spring adjusting piece (53) is the upper limiting structure, and the lower spring adjusting piece (54) is the lower limiting structure;

15. The method of releasing a film of claim 14, further comprising:

adding a predicted material into the material box (32), and before demoulding, keeping the upward elastic force of the lower spring (52), the self weight of the material box (32) and the weight of the predicted material as the downward elastic force of the upper spring (51) so that the film (39) is placed on the upper surface of the glass plate (34) to be in a close state and has an adsorption force between the two;

when the film is stripped, the printing mechanism (2) moves upwards to overcome the adsorption force, when the printing object is pulled, the film (39) and the glass plate (34) start to separate slowly, oxygen enters between the film (39) and the glass plate (34), the film is stripped between the film and the glass plate (34) in a first stage, at the moment, the adsorption force exists between the film and the printing object, the downward elastic force of the upper spring (51), the gravity of the material box (32), the gravity of the expected material is less than the upward elastic force of the lower spring (52) and the upward force of the printing mechanism (2);

the upper spring (51) and the lower spring (52) drive the material box (32) to move upwards for a certain distance along with the printing mechanism (2), and when the downward elastic force of the upper spring (51), the gravity of the material box (32) and the gravity of the expected material are larger than the upward elastic force of the lower spring (52) and the upward force of the printing mechanism (2), the film (39) and the glass plate (34) are completely separated, so that the film separation between the film and the printed object in the second stage is realized.