CN112519222B

CN112519222B - Release device and method based on adsorption cavity

Info

Publication number: CN112519222B
Application number: CN202110176955.2A
Authority: CN
Inventors: 季鹏凯
Original assignee: Yuanzhi Technologies Shanghai Co ltd
Current assignee: Yuanzhi Technologies Shanghai Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-06-25
Anticipated expiration: 2041-02-07
Also published as: CN112519222A

Abstract

The invention relates to a release device and a method based on an adsorption cavity, the device comprises a liquid tank body and a light-transmitting release plate, photosensitive materials are arranged in the liquid tank body, light beams selectively irradiate the photosensitive materials through the release plate to print a curing model layer by layer, the curing model and a release film are controlled to move away from each other in the layer-by-layer printing process, a supporting plate is arranged on the other side of the release plate relative to the curing model, a gap is formed between the supporting plate and the release plate to form the adsorption cavity, the adsorption cavity is connected with a medium source and can perform medium control on the adsorption cavity through the medium source, and the release plate is alternated in a printing working position and a peeling working position. The invention improves the separation speed between the light-transmitting component and the curing model, improves the three-dimensional printing speed and improves the heat dissipation effect.

Description

Release device and method based on adsorption cavity

Technical Field

The invention belongs to the technical field of photocuring three-dimensional printing, and particularly relates to a release device and a release method based on an adsorption cavity.

Background

In the existing photocuring three-dimensional (3D) printer based on release film, in the process of each layer of illumination curing, a model can be bonded on the release film, the curing model is usually separated from the release film by adopting a mode that a platform combined with the curing model moves upwards greatly and then descends to return to the position with the set layer thickness distance, and the forming platform does reciprocating motion to slow the separation speed. Although the separation speed can be increased by inclining the release film, the platform still needs to be raised to a larger height and then lowered for resin reflow. If adopt the running roller to roll to make from type membrane and solidification model separation from type membrane lower surface, then promote the platform again and make the solidification model with separate the type face complete separation, and let photosensitive resin backward flow fill, then because the number of piles of printing process is many, roll the friction can reduce life-span and the light transmission performance from the type membrane by the running roller many times, and running roller scanning formula roll process also occupies longer time, and increase the removal actuating mechanism of running roller, the mechanism complexity increases, still generally the upper and lower reciprocating motion that needs the platform in addition comes separation and resin backward flow, equipment reliability and printing speed all remain to promote. Moreover, these release methods do not provide an effective solution for dissipating heat generated by polymerization during printing. There is a need for a more efficient and compact separation scheme for the model and the release film, which can improve the speed and efficiency of the photo-curing three-dimensional printing and improve the heat dissipation performance to improve the stability of the device.

Disclosure of Invention

The invention aims to provide a release device and a release method based on an adsorption cavity, which can improve the separation speed between a light-transmitting component and a curing model, improve the three-dimensional printing speed and improve the heat dissipation effect.

The invention provides a release device based on an adsorption cavity, which comprises a liquid tank body and a light-transmitting release plate, wherein photosensitive material is arranged in the liquid tank body, light beams selectively irradiate the photosensitive material through the release plate to print and form a curing model layer by layer, the curing model and the release plate can be controlled to relatively move away from each other in the layer-by-layer printing process, a light-transmitting support plate is arranged on the other side of the release plate relative to the curing model, a gap is formed between the support plate and the release plate and is sealed to form the adsorption cavity, the adsorption cavity is communicated with a medium source, the medium source injects or extracts a preset volume of light-transmitting liquid medium into or from the adsorption cavity, so that the release plate is alternated in a printing working position and a peeling working position, and when the medium source injects the preset volume of the liquid medium into the adsorption cavity, the release plate moves to a printing working position, and light beams selectively irradiate the photosensitive material through the supporting plate, the adsorption cavity and the release plate; when the separation plate is at a separation working position, the medium source extracts the liquid medium in the adsorption cavity, the separation plate moves towards one side of the supporting plate and is separated from the curing model, and the outward movement of the separation plate is limited through the supporting plate.

A release device based on an adsorption cavity comprises a liquid tank body and a light-transmitting release plate, wherein a photosensitive material is arranged in the liquid tank body, light beams selectively irradiate the photosensitive material through the release plate to print, form and solidify a model layer by layer, the curing model and the release plate can be controlled to move away from each other in the layer-by-layer printing process, and the curing model further comprises a positioning part, and the other side of the release plate opposite to the curing model is provided with a light-permeable supporting plate, a gap is arranged between the supporting plate and the release plate, and is sealed to form an adsorption cavity, the adsorption cavity is communicated with a medium source, the medium source injects a light-permeable liquid medium into the adsorption cavity or extracts the liquid medium, the separation plate is alternated between a printing working position and a stripping working position, the medium source injects a light-transmitting liquid medium with preset volume or pressure intensity into the adsorption cavity, the separation plate moves to a printing working position, and the printing working position of the separation plate is positioned through the positioning part; the light beam penetrates through the supporting plate, the adsorption cavity and the release plate to selectively irradiate the photosensitive material, when the release plate is in a stripping working position, the medium source extracts the light-transmitting liquid medium in the adsorption cavity, the release plate moves towards one side of the supporting plate and is stripped from the curing model, and the outward movement of the release plate is limited through the supporting plate.

The positioning part is the end part of the liquid tank body, or the positioning part is arranged on the inner wall of the liquid tank body.

The two opposite sides of the adsorption cavity are provided with a plurality of openings connected with the medium source, and when the ion plate is stripped, the opening on one side of the adsorption cavity draws out the liquid medium in the adsorption cavity before the opening on the other side.

An elastic part is arranged between the separation plate and the supporting plate, the elastic part is arranged along two opposite sides of the separation plate, and the elastic force of the elastic part on one side is greater than that of the elastic part on the other side.

An elastic sealing element is arranged between the positioning part and the release plate; the elastic force of the sealing element along one side of the separation plate is larger than that of the opposite other side.

The release device based on the adsorption cavity further comprises a forming platform and a light-transmitting assembly, the liquid tank body is of a cylinder sleeve structure, and the light-transmitting assembly comprises the release plate and the corresponding support plate; the forming platform is fixedly connected with the liquid tank body or the frame, the forming platform and the liquid tank body are kept sealed in the printing process, the light-transmitting component is in sliding sealing fit with the inner wall of the liquid tank body, the forming platform, the liquid tank body and the light-transmitting component form a sealed printing working cavity, the printing working cavity is communicated with a printing material source, and the printing material source fills photosensitive material with preset pressure into the working cavity; or, printing material source fills into the photosensitive material of predetermineeing pressure to the work intracavity, printing material source links firmly with liquid cell body or frame, at the printing in-process keep sealed between printing material component and the liquid cell body, the inner wall sliding seal cooperation of shaping platform and liquid cell body, shaping platform, liquid cell body and printing material component have formed sealed printing work chamber, print work chamber and printing material source intercommunication.

The pipelines for injecting and extracting the liquid medium are provided with radiators.

The two sides of the liquid tank internal curing model are respectively provided with a first light-transmitting component and a second light-transmitting component, the first light-transmitting component and the second light-transmitting component are respectively in sliding seal fit with the inner wall of the liquid tank body, a sealed working cavity is formed by the first light-transmitting component, the second light-transmitting component and the liquid tank body, the working cavity is communicated with a printing material source, the printing material source is filled with photosensitive material with preset pressure intensity in the working cavity, and a first adsorption cavity of the first light-transmitting component and a second adsorption cavity of the second light-transmitting component are respectively communicated with the medium source.

The printing device also comprises a forming platform, a light-transmitting component and a control module, wherein the forming platform is fixedly connected with the liquid tank body or the frame, and the sealing is kept between the forming platform and the liquid tank body in the printing process; the light-transmitting component is in sliding seal fit with the inner wall of the liquid tank body, the forming platform, the liquid tank body and the light-transmitting component form a sealed working cavity, the working cavity is communicated with a printing material source, and the printing material source charges photosensitive material with preset pressure into the working cavity; printing opacity subassembly includes the separation plate with correspond the backup pad still includes the sliding sleeve, the sliding sleeve links firmly with the backup pad, the sliding sleeve cooperates with the inner wall sliding seal of liquid cell body, the separation plate cooperates with the inner wall sliding seal of sliding sleeve the sliding sleeve is kept away from the location portion that backup pad department set up towards the shaping platform and is fixed a position the printing work position of separation plate, sliding sleeve and backup pad form sealed absorption chamber.

A release method based on an adsorption cavity adopts a photocuring three-dimensional printing device which comprises a liquid tank body and a light-transmitting release film, wherein photosensitive materials are arranged in the liquid tank body, light beams selectively irradiate the photosensitive materials through the release film to print a formed curing model layer by layer, the curing model and the release film are controlled to relatively move away in the layer-by-layer printing process, a light-transmitting support plate is arranged on the other side of the release film relative to the curing model, a gap is formed between the support plate and the release film, a support ring is arranged between the support plate and the release film, a sealed adsorption cavity is formed among the support plate, the support ring and the release film, the adsorption cavity is communicated with a medium source, the medium source is used for alternately arranging the release film at a printing working position and a peeling working position by injecting or extracting the light-transmitting liquid medium with preset volume or pressure into the adsorption cavity, a medium source injects a light-transmitting liquid medium with preset volume or pressure intensity into the adsorption cavity, when the release film is in a printing working position, the release film is in a plane structure, and the light beam selectively irradiates the photosensitive material through the release film; when the release film is in a peeling working position, the medium source extracts the light-transmitting liquid medium in the adsorption cavity, one side of the release film, facing the support plate, generates a deformation bulge and peels off the curing model, and the outward bulge of the release film is limited through the support plate, and the method comprises the following steps:

(1) when the release film is positioned at a printing working position, selectively irradiating the photosensitive material through the light beam transmitting the support plate, the adsorption cavity and the release film to be cured to form a cured layer according to the layer pattern of the cured model;

(2) pumping out a transparent liquid medium in the adsorption cavity through a medium source, so that one side of the release film facing the support plate is subjected to convex deformation and is stripped from the curing model, and injecting the liquid medium with preset volume or pressure intensity into the adsorption cavity through the medium source after stripping so that the release film is restored to a printing working position;

(3) controlling the solidified curing model and the release film to move relatively far away from each other to a preset distance;

(4) repeating the steps (1) to (3), and printing layer by layer to obtain a finally formed curing model; the step (2) and the step (3) are carried out synchronously; or, firstly, carrying out the step (2) and then carrying out the step (3); alternatively, step (3) is performed first, and then step (2) is performed.

And (4) keeping the solidification model moving in a single direction in the step (3) until the printing surface of the solidification model and the printing working position of the release film reach a preset distance.

And (2) in the process of pumping out the liquid medium in the adsorption cavity by using the medium source, monitoring the vacuum degree or pressure intensity in the adsorption cavity to judge the separation condition between the release film and the curing model, and when the release film is detected to be separated from the curing model, stopping stripping the working position state.

The release method based on the adsorption cavity uses the release device based on the adsorption cavity, and comprises the following steps:

(1) when the release plate is positioned at a printing working position, selectively irradiating the photosensitive material through the support plate, the adsorption cavity and the release plate by light beams according to the layer pattern of the curing model to be cured to form a cured layer;

(2) pumping out a light-transmitting liquid medium in the adsorption cavity through a medium source, moving the ion plate towards one side of the support plate to be stripped from the curing model, and injecting a liquid medium with a preset volume or pressure intensity into the adsorption cavity through the medium source after stripping so as to restore the ion plate to a printing working position;

(3) controlling the solidified curing model and the release plate to move relatively far away from each other to a preset distance;

In the process of peeling the separation plate from the curing model, one side of the separation plate is peeled from the curing model and is inclined, and then the separation plate is integrally separated from the curing model.

Advantageous effects

Firstly, the invention can utilize the medium source to accurately control the amount of the light-permeable liquid medium injected into or extracted from the adsorption cavity, utilize the incompressibility of the liquid, accurately and quickly control the state of the light-permeable component, realize the quick separation between the light-permeable component and the curing model, and also improve the pressure of the photosensitive material, so that the tension of the forming platform on the curing model in the stripping (separating and releasing) process between the light-permeable component and the curing model is reduced, the deformation or separation possibility of the model in the stripping process is greatly reduced, and the printing precision and the printing speed are effectively improved.

Second, through producing the deformation of the relative solidification model of keeping away from the direction each other or peeling off from the relative solidification model of template and keeping away from the removal of direction from the type membrane for the forming platform can keep unidirectional movement, so avoided the forming platform to realize peeling off through reciprocating motion, avoided the influence of forming platform's actuating mechanism clearance (like the backlash or the backlash of lead screw pair etc.) to forming platform position precision, do benefit to and promote the printing precision, also do benefit to and promote printing speed.

Third, the liquid medium that adsorbs the intracavity can flow the change in the circulation process of reinjection into after being taken out, can take away from type membrane and near photosensitive material because of the light beam shines the heat that takes place the photocuring reaction and produce, liquid medium has bigger heat capacity than gaseous medium and can carry more heats, be favorable to dispelling the heat from type membrane and photosensitive material, especially can utilize the effect that the promotion of refrigerated medium kept photosensitive material temperature, be favorable to promoting the stability that equipment printed.

Drawings

Fig. 1 is a schematic structural view of an embodiment of a light-transmitting member of the present invention using a release film.

Fig. 2 is a schematic structural view of an embodiment of the light-transmitting member of the present invention using an off-plate.

Fig. 3 to 5 are schematic diagrams of a printing process according to embodiment 1 of the present invention.

Fig. 6 to 7 are schematic structural views of a plurality of openings or a photosensitive material pressurization in embodiment 2 of the present invention.

Fig. 8 to 10 are schematic structural views of a light-transmitting member adopting an off-plate in embodiment 3 of the present invention.

Fig. 11 to 12 are schematic structural diagrams of a light-transmitting assembly sliding in a cylinder sleeve according to embodiment 4 of the present invention.

Fig. 13 to 14 are schematic structural views of a dual light-transmitting assembly in embodiment 5 of the present invention.

Fig. 15 to 16 are schematic structural views of a light-transmitting member of embodiment 6 of the present invention, in which an off-plate is used and a photosensitive material is pressurized.

FIGS. 17 to 18 are schematic views of another structure of a light-transmitting member using an off-plate in embodiment 7 of the present invention

Fig. 19 to 22 are schematic structural diagrams of a light transmission assembly based on an off-plate sliding in a cylinder liner in embodiment 8 of the present invention.

Fig. 23 to 24 are schematic structural diagrams of a release plate slidably sleeved in a cylinder sleeve in embodiment 9 of the present invention.

FIG. 25 is a schematic structural view of an embodiment of the light-transmitting member of the present invention using an off-plate and without a positioning portion;

FIG. 26 is a printing flow diagram of the present invention.

FIG. 27 is a graph showing the variation of the distance S between the molding bed and the release surface and the volume Q of the liquid medium in the adsorption chamber with time t.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Example 1

Fig. 1 illustrates a photo-curing three-dimensional printing device, which comprises a liquid tank 2, wherein the liquid tank 2 comprises a liquid tank body 21, a light-transmitting parting piece, a supporting plate 35 and a supporting ring 26. The release element in this embodiment adopts a release film 33, the release film 33 is arranged at the bottom of the liquid tank body 21, and a photosensitive material 5 is filled in a working tank (or called as a working cavity) formed by the release film 33 and the liquid tank body 21. The support ring 26 is disposed between the release film 33 and the support plate 35, and an upper surface of the support ring 26 may contact the release film 33 and a lower surface thereof contacts the support plate 35. The release film 33, the support ring 26 and the support plate 35 form a sealed adsorption cavity 38, the support ring 26 can be integrated on the support plate 35 to form an integrated structure, which is also called as a support plate, the sealed adsorption cavity 38 is formed by a gap between the release film 33 and the support plate 35, and a liquid medium 71 is arranged in the adsorption cavity 38.

Fig. 1 shows that the light beam 39 emitted by the light source 37 can be transformed by the mirror assembly 36 and then illuminates the photosensitive material 5. The surface of the transparent release member contacting the photosensitive material 5 is a release surface, such as the upper surface of the release film 33 in fig. 1 to 3, and the surface of the curing mold 51 contacting the release surface is a printing surface, such as the lower surface of the curing mold 51 in fig. 1 or 3. Fig. 3 shows that the forming platform 1 can be driven by the driving mechanism 15 to move in a direction away from the release film 33. The driving mechanism 15 can be a screw pair and a guide rail mechanism, or other mechanisms for realizing the movement of the forming platform 1.

Fig. 1 and 3 show that a transition region 26a may also be provided at a portion of the support ring 26 facing the adsorption cavity, for example, the transition region 26a is formed by a circular arc or an oblique line shape that is formed by a ramp-like converging transition from a light-transmissive release member (release film 33) to a support plate 35. When the release film 33 is vacuum-absorbed toward the supporting plate 35, the peripheral region of the release film 33 is supported by the transition region 26a to form a slope shape, as shown in fig. 3, thereby avoiding sudden change or right-angle deformation of curvature of the release film 33, avoiding local stress concentration of the release film 33, and greatly increasing reliability and service life of the release film 33. The release film 33 is generally made of a transparent organic film material, and may be a release film material commonly used in the industry, such as a polytetrafluoroethylene film (teflon film), an FEP resin (fluorinated ethylene propylene copolymer), or a PET film, and has elasticity, so that the release film 33 is forced to deform toward the supporting plate 35 under the action of the atmospheric pressure of the photosensitive material 5 side or the pressurized photosensitive material 5, and may be attached to the supporting plate 35, and the supporting plate 35 may be made of a transparent plate material, such as glass, PMMA (polymethyl methacrylate), COC (Cyclic olefin copolymer), or quartz. Utilize backup pad 35 to limit from the deformation range of type membrane 33, can ensure to separate from type membrane 33 and solidification model 51, photosensitive material 5 can fill the backward flow simultaneously and leave the clearance between type face and the solidification model 51, can prevent again from the too big damage or life-span of reducing of type membrane deformation.

In the printing process, as shown in fig. 3, the medium source 4 injects a liquid medium 71 with a set volume or pressure into the adsorption cavity 38, the transparent release film 33 is in a flat printing working position state, a preset distance is formed between the forming platform 1 and the release film 33 or between the release surfaces, the light beam 39 emitted by the light source 37 selectively irradiates the photosensitive material 5 through the support plate 35, the adsorption cavity 38 and the release film 33 to form a preset cured layer, the curing model 51 is combined on the forming platform 1, the forming platform 1 can move away from the transparent plate 3 relatively, so that the light beam 39 irradiates the cured layer formed by the photosensitive material 5 layer by layer to form the curing model 51, which is combined on the forming platform 1. For example, in fig. 3, the medium source 4 is a plunger pump, the volume of the liquid medium injected into the adsorption cavity is controlled by controlling the distance that the plunger 76 moves in the cylinder 75, and a heat dissipation fin 72 may be provided outside the cylinder 75 to dissipate heat from the liquid medium 71.

After the completion of the curing of one layer, as shown in fig. 4, the irradiation of the light beam 39 is stopped, and the liquid medium 71 in the adsorption chamber 38 is extracted by the medium source 4. As the plunger 76 moves downwards in fig. 4, so that the space in the cylinder housing 75 is increased, and optimally, the medium source 4 is arranged at a position below the adsorption cavity 38, the liquid medium 71 flows out of the adsorption cavity to the medium source 4 rapidly under the action of gravity, so that the release film 33 is deformed towards the direction of the support plate 35 rapidly under the action of gravity and pressure of the photosensitive material 5 above as shown in fig. 4, cracks are formed at the edge of the combination with the curing mold 51, the separation of the release film 33 and the curing mold 51 is accelerated, and the release film 33 can be completely separated from the printing surface of the curing mold 51 by the medium source 4 pumping enough liquid medium or keeping the stripping working position for a certain time. Fill photosensitive material 5 from the clearance backward flow between type membrane 33 and the solidification model 51, the separation perhaps pastes to the backup pad 35 from type membrane 33, and the backup pad 35 is spacing to this deformation from type membrane 33, and the backup pad 35 has injectd the maximum deflection from type membrane 33 and is supporting and protecting from type membrane 33. As shown in fig. 5, the plunger 76 is moved to the lowermost position, and the release film 33 abuts on the supporting plate 35 and forms a large gap with the curing mold 51, so that the photosensitive material 51 can be quickly filled with the reflow. Fig. 5 illustrates that in the above process, the forming platform 1 can also move upward away from the release film 33 along the arrow shown in the figure until the next layer is printed at the preset position.

Then the medium source 4 is stopped and the liquid medium 71 with the set volume is re-injected into the adsorption cavity, the release film 33 is restored to the flat state, the forming platform 1 may move to the preset position for printing the next layer at this time, a layer thickness gap of the printed layer is formed between the printing surface of the curing mold 51 and the printing working position of the release film 33, the state shown in fig. 3 is returned, and then the light beam 39 shown in fig. 3 is continued to irradiate the photosensitive material according to the layer pattern information of the next layer, so as to form a new cured layer to be combined on the curing mold 51. This is repeated until printing is completed. The structure and the method can accelerate the separation speed of the release film 33 and the curing model 51, can simultaneously carry out the separation process and the movement of the forming platform, further improve the printing speed, and can quickly take away heat by radiating heat in the stripping process of the liquid medium 71, thereby being beneficial to radiating the release film 33 and the photosensitive material 51, improving the printing speed and the printing quality and improving the stability of equipment.

Example 2

Fig. 6 to 8 show that the opening 28 communicating with the adsorption chamber is disposed as low as possible, for example, the opening is illustrated in fig. 6 as being disposed at the lowermost position of the support ring 26, and fig. 7 shows that the first opening 28-1 or the second opening 28-2 may also be disposed on the support plate 35, for example, vertically penetrating the support plate 35. It may be more convenient to provide holes in the support plate 35. Fig. 8 shows the light-transmitting plate 35 and the support ring 26 as one piece, with openings provided in the area between the support ring 26 and the support plate 35. In short, the opening 28-1 or the opening 28-2 is preferably disposed at a position as far as possible below the adsorption cavity 38, so as to facilitate the outflow of the liquid medium 71 during the peeling process, and the release film 33 may cover the opening 28-1 or the opening 28-2 only at last, so as to better prevent the liquid medium 71 in the adsorption cavity from being difficult to further flow out after the opening is covered by the release film 33 too early, avoid or reduce the residue, facilitate the deformation of the release film 33 toward the support plate 35 and facilitate the rapid peeling, and of course, facilitate the subsequent injection of the liquid medium 71. The liquid medium for the light source 39 may be water, lubricant, coolant, or other light transmissive liquid material. The liquid medium can be used for facilitating heat dissipation of the release film 33 and the photosensitive material 5, for example, in each cycle process repeated in fig. 3 to 5, the liquid medium 71 in the adsorption cavity can be sucked out and re-injected once, and the liquid medium with higher heat capacity than gas can achieve faster heat dissipation. Liquid medium 71 can hardly be compressed, and is more easily and quickly drawn out or injected into the mold, so that the release film is controlled, the printing speed is increased, and the alternating process of frequent printing positions and peeling positions is favorable for the liquid medium to be more energy-saving, simpler and more efficient than a gas medium, and the equipment is small and exquisite. And compare gas, it is sealed more easily, do benefit to reduction equipment cost and convenient maintenance. The clearance between the release film 33 and the support plate 35 is h, i.e. the thickness of the support ring 26 or the height of the adsorption cavity, and the clearance h defines the deformation of the release film 33, and the support plate 35 is used for limiting and supporting the release film 33 in the peeling process.

In order to improve the heat dissipation effect, fig. 6 to fig. 7 may also schematically provide a plurality of medium sources, for example,

medium sources

4a and 4b are provided in the figures, and fig. 6 illustrates that two medium sources 4b inject a preset volume of liquid medium 71 into the adsorption cavity to form a printing work position, and the medium sources 4b keep a state of continuing heat dissipation. The light beam 39 selectively irradiates the photosensitive material 5 to form a curing mold 51, then the medium source 4b extracts the liquid medium 71 in the adsorption cavity, as shown in fig. 7, the supporting plate enters a peeling working position to peel off the curing mold 51, and the release film 33 is attached to the supporting plate 35. The media source 4a may then be allowed to inject liquid media into the adsorption cavity to restore the print station, while the liquid media in the media source 4b may continue to dissipate heat. The alternative work through two medium sources can let the liquid medium heat dissipation more abundant, promotes the radiating effect by a wide margin, can keep the temperature from type membrane 33 or photosensitive material 5, does benefit to and promotes printing speed and printing accuracy. A plurality of openings can be arranged in the adsorption cavity and communicated with the same medium source 4 respectively, the openings are far away from each other as far as possible, and for example, the periphery of the adsorption cavity is provided with a plurality of openings which are communicated with the medium source. If the backup pad with leave the absorption chamber that the type membrane formed when not very flat placing, when forming and peel off the work position in-process, liquid medium can be detained in the low department of slope, and set up a plurality of trompils through the absorption chamber periphery, no matter the absorption chamber side is lower can let liquid medium flow out through the trompil nearby, ensure that the process of peeling off reliably goes on, reduce the influence to the environment, for example reduce to the planarization such as ground or desktop or the influence of environmental vibration to the printing process, promote equipment operational reliability and stability. The support ring 26 may be integrated with the support plate 35 by an adhesive in the above-described embodiments, the support ring 26 may not be transparent to light, and the support ring 26 and the support plate 35 may be different parts of the same component.

As shown in fig. 8, the forming platform 1 is in sliding sealing fit with the inner wall of the liquid tank 21, the supporting plate 35 and the release film 33 are fixedly sealed with one end of the liquid tank 21, a sealed working chamber is formed inside the liquid tank 21, the sealed working chamber is communicated with the printing material source 59, and the pressure of the photosensitive material 5 in the working chamber can be controlled to be a set value or range by using the printing material source 59. In the stripping process, the medium source 4 extracts the liquid medium in the adsorption cavity, so that the release film 33 protrudes and deforms towards the direction of the support plate 35 under the pressure of the photosensitive material 5, and can be attached to the support plate 35, and meanwhile, the forming platform 1 can move for a set distance away from the direction of the release film. Then, a liquid medium with a preset volume can be injected into the adsorption cavity, the release film 33 is restored to the printing position, the next layer of printing can be performed, and the light beam 39 (not shown in the figure) selectively irradiates the photosensitive material 5 in the liquid tank 21 through the support plate 35, the adsorption cavity and the release film 33 to form the curing model 51. After being pumped out by the medium source 4, the liquid medium can flow through the medium box 49 with the radiator 72-1, the medium source 4 is pumped out by the medium box 49 and injected into the adsorption cavity after being radiated by the radiator 72-1, the heat radiation of the release film and the photosensitive material 5 by the medium is favorably realized, and the medium source 4 can adopt a pumping device, such as a gear pump or other pumps for realizing accurate volume control. The photosensitive material 5 of pressure boost can be more quick fill to from between type membrane 33 and the solidification model 51, promote printing speed, and owing to can promote the pressure of photosensitive material 5, peel off in-process photosensitive material 5 and also can push solidification model 51 to forming platform 1, make from type membrane 33 to the effort of solidification model by the thrust balance of photosensitive material 5, reduce the pulling force that receives forming platform 1 of the stripping off in-process of solidification model 51, do benefit to the deformation that reduces the solidification model, promote printing precision and stability. Due to incompressibility of the liquid medium, the medium source 4 still can realize the printing working position of the release film by injecting the liquid medium with the preset volume into the adsorption cavity, the influence of the pressure of the photosensitive material 5 can be avoided, the mutual independence of the pressure control of the photosensitive material 5 and the control of the printing working position or the peeling working position of the release film is realized, and the realization mode is simple and reliable. In the printing process, the photosensitive material 5 can circularly flow from the printing material source 59 to the printing material box 55 through the working cavity and the valve 57, the heat generated by the polymerization reaction of the photosensitive material irradiated by the light beam 39 is taken away by utilizing the flow of the photosensitive material 5 to dissipate heat, especially the photosensitive material 5 close to the accessory of the release film 33 is taken away, the heat can be effectively carried, and a radiator 72-2 can be arranged on a pipeline to accelerate the heat dissipation of the photosensitive material. In addition, a valve 58 can be arranged, and after printing is finished, the valve 58 can be opened to flow the photosensitive material 58 in the liquid tank 21 back to the printing material box 55. The structure that adopts overhead light source still to indicate in the picture can let photosensitive material 5's weight can not be used from type membrane 33 on, does benefit to and keeps the leveling state when printing the work position from type membrane 33.

Example 3

As shown in fig. 2, 9 and 10, the light-transmitting member is a separation plate 31, the separation plate 31 is in sliding sealing fit with the inner side of the liquid tank 21, it is shown in the drawings that a positioning portion 24 is provided on the inner wall of the liquid tank 21, for example, the positioning portion 24 is formed on the inward-protruding portion of the inner wall of the liquid tank 24, the positioning portion 24 may be a circumferential structure or a multi-segment structure along the circumference, or may be a separate component installed on the inner wall of the liquid tank, the separation plate 31 is in sliding sealing fit with the inner wall of the liquid tank 21, and is positioned upwards by the positioning portion 24 to determine a printing working position, an elastic sealing member 27 is provided between the positioning portion 24 and the separation plate 31, and the lower portion of the liquid tank 21 is fixedly connected with and sealed with the support plate. A sealed adsorption cavity is formed by the support plate 35, the liquid tank body 21 and the release plate 31, and is communicated with the medium source 4. In the printing process, as shown in fig. 2, the medium source 4 injects a liquid medium 71 with a set volume or pressure into the adsorption cavity, the light-transmitting release plate 31 moves to the positioning portion 24 of the liquid tank body 21 and is located at a printing working position, a set distance is formed between the forming platform 1 and the release plate 31, and the light beam 39 selectively irradiates the photosensitive material 5 in the working cavity through the support plate 35, the liquid medium 71 and the release plate 31 to complete one-layer printing; then the medium source 4 draws out the liquid medium 71 in the adsorption cavity, the release plate 31 moves away from the forming platform 1, and can be abutted to the supporting plate 35 for limiting, as shown in fig. 10, and is in a stripping working position, so that the separation (stripping) of the release plate 31 and the curing mold 51 is realized, and meanwhile, the forming platform 1 can move upwards for a set distance as shown by an arrow in the figure. The media source 4 can then inject the liquid media 71 into the suction chamber again, and return to the printing position shown in fig. 2, so that the solidified layers solidified layer by layer are combined to form the solidified model 51, and the solidified model 51 is combined on the forming platform 1. The rigid light-transmitting release plate 31 is moved to realize the conversion between the printing working position and the peeling working position, and is more reliable and durable than the elastic release film 33 which is converted through elastic deformation, and the leveling of the release surface 32 (as shown in fig. 25) is easier to realize. In addition, a plurality of openings can be provided, for example, the opening 28 is provided in fig. 9, and the opening 28-1 is further provided and is respectively communicated with the medium sources 4 and 4-1 through pipelines, during the separation process, the medium source 4 can be firstly operated to suck the medium 71 in the adsorption cavity, the medium source 4-1 is firstly kept out of operation, so that the stress part on the adsorption cavity side of the separation plate 31 is balanced and obliquely moves towards the opening for firstly sucking the medium, the separation plate 31 is obliquely stripped from the solidified layer in a manner of being "torn" from the solidified layer, then, the other medium source 4-1 can also start to suck the medium, the separation plate 31 is completely separated from the solidified layer, and the inclination of the separation plate is realized through different time sequences of liquid medium suction along the openings on two opposite sides of the separation plate, as shown in fig. 10. The periphery that can also set up more than 3 openings at the backup pad, the best can be each other the equidistant setting of circumference, can let each opening in turn open in the course of separation, for example the medium in the absorption intracavity is taken out in proper order to the clockwise direction of circumference, can let the incline direction of off-plate constantly change along the circumference direction so, make off-plate "tear" from solidification model 51 in a plurality of directions are in proper order, can further reduce the atress of the separation process of solidified layer, accelerate the separation rate, reduce the deformation of model 51, promote the printing accuracy. In addition, as shown in fig. 25, the release plate 31 and the liquid tank 21 can slide along the axial direction without using the positioning part 24, and keep sealing mutually, for example, a sealing part 27 is arranged between the release plate and the liquid tank, and the volume of the medium 71 in the adsorption cavity is controlled by the medium source 4 to control the position of the release plate 31, so that the release plate can be alternately changed between the printing working position and the stripping working position.

Example 4

Fig. 11 illustrates that the forming platform 1 is fixedly connected to the liquid tank 21 or the frame 91, and the forming platform 1 and the liquid tank 21 are kept sealed in the printing process, the light-transmitting component includes the release film 33 and the supporting plate 35, the light-transmitting component is in sliding sealing fit with the inside of the liquid tank 21, for example, the supporting plate 35 is in sliding sealing fit with the inner wall of the liquid tank 21, and the sealing ring 27 can be arranged between the supporting plate 35 and the liquid tank 21 to enhance the sealing effect. Set up from type membrane 33 above backup pad 35, set up from type membrane 33 and backup pad 35 and predetermine the clearance and form sealed absorption chamber. The forming platform 1, the liquid tank 21, the support plate 35 and the release film 33 form a sealed working cavity, the working cavity is communicated with the printing material source 59, and the printing material source 59 fills photosensitive material 5 with preset pressure intensity into the working cavity. In the printing process, the light beam 39 emitted by the light source 37 selectively irradiates the photosensitive material 5 in the liquid tank 21 through the support plate 35, the adsorption cavity and the release film 33 to form a curing model 51, the curing model 51 is combined on the lower surface of the forming platform 1, after one layer of printing is completed, stopping irradiating the light beam 39, pumping the liquid medium release film in the adsorption cavity by the medium source 4 to enter a stripping working position, after the stripping is finished, the medium source 4 injects the preset volume of liquid medium 71 into the adsorption cavity again, the release film 33 recovers the printing working position, meanwhile, the support plate 35 is brought to the release film 33 and is connected with the driving mechanism 15 through a connecting piece 38 (comprising a transverse connecting piece 38b and a vertical connecting piece 38 a), the driving mechanism 15 drives the support plate 35 and the release film 33 to move downwards away from the forming platform 1 for a set distance, e.g., layer thickness, and then the beam is cured by the next layer of radiation, and so on until the pattern is printed. After printing, the printing material source 59 can be stopped, preferably, the pressure intensity in the working cavity is reduced, then the forming platform 1 is taken down from the liquid tank 21 or the frame 91, and the curing model 51 can be taken out, as shown in fig. 12, the structure can ensure reliable sealing of the working cavity and facilitate taking out of the curing model 51, a platform structure can be formed above the device, and the device is convenient to use, simple and attractive.

Example 5

Fig. 13 and 14 show that two sets of release films 33 and transparent support plates 35 are arranged on two sides of a curing model 51 in a liquid tank 21 for realizing bidirectional simultaneous printing, a first transparent component 20-1 and a second transparent component 20-2 are respectively arranged on the left side and the right side in the figure, the first transparent component 20-1 comprises the release film 33-1, the support plate 35-1 and a sliding seal 27 between the support plate 35-1 and the inner wall of the liquid tank 21, and the second transparent component 20-2 comprises the release film 33-2, the support plate 35-2 and a sliding seal 27 between the support plate 35-2 and the inner wall of the liquid tank 21. The first light-transmitting component 20-1 and the second light-transmitting component 20-2 are in sliding sealing fit in the liquid tank body 21 and form a sealed working cavity with the liquid tank body 21. The working chamber is in communication with a printing material source 59, and the printing material source 5 charges the photosensitive material 5 at a predetermined pressure into the working chamber. A sealed first adsorption cavity is formed by the release film 33-1 and the support plate 35-1, a sealed second adsorption cavity is formed by the release film 33-1 and the support plate 35-1, and the first adsorption cavity and the second adsorption cavity are respectively communicated with the medium source 4. When the medium source 4 injects a predetermined volume of liquid medium into the two adsorption cavities, as shown in fig. 13, the release film 33 is in a printing position of a planar state, the light beams 39-1 and 39-2 irradiate the photosensitive material through the support plate and the release film on two sides, respectively, and a cured layer is formed on two sides of the curing mold 51 at the same time. Then, as shown in fig. 14, the light beam irradiation is stopped, the medium source 4 extracts the liquid medium from the two adsorption cavities to form a peeling working position, and simultaneously the first light transmission component 20-1 and the second light transmission component 20-2 can also move away from each other respectively, as shown in fig. 14, the first light transmission component and the second light transmission component move along two hollow arrows respectively, the release films 33-1 and 33-2 press the support plates 35-1 and 35-2 respectively under the pressure of the photosensitive material 5, the release films on the left side and the right side are separated from the two sides of the curing mold 51 respectively, and the photosensitive material is filled in the gaps between the curing mold 51 and the release films in a backflow mode respectively. Then the medium source 4 injects a liquid medium with a preset volume into the two adsorption cavities, the two adsorption cavities are restored to the printing working position again, the first light-transmitting component 20-1 and the second light-transmitting component 20-2 move to the preset position for printing of the next layer, the illumination curing printing of the next layer is started, and the operation is repeated. In addition, the first light transmission member 20-1 and the second light transmission member 20-2 may also be similar to the light transmission members shown in fig. 19 to 24, and include an off-plate 31 and a support plate 35, respectively, and a gap between the off-plate and the support plate in the first light transmission member 20-1 is sealed to form a first absorption cavity, and a gap between the off-plate and the support plate in the second light transmission member 20-2 is sealed to form a second absorption cavity.

Example 6

Fig. 15 and 16 show that the parting member adopts a light-transmitting parting plate 31, the parting plate 31 is in sliding sealing fit with the inner side of the liquid tank body 21, the upper end of the liquid tank body 21 is shown in the drawings to be provided with a section of transition sleeve 23, the parting plate 31 is in sliding sealing fit with the transition sleeve 23, the parting plate is positioned downwards by the upper end surface of the liquid tank body 21, namely, a positioning part, the upper part of the liquid tank body 21 is fixedly connected and sealed with a support plate 35, and the upper end of the specific liquid tank body 21 is provided with a section of transition sleeve 23 which is fixedly connected and sealed with the support plate. A sealed adsorption cavity is formed by the support plate 35, the liquid tank body 21 (specifically, the transition sleeve 23) and the ion plate 31, and the adsorption cavity is communicated with the medium source 4. A sealing ring 27 may also be provided between the release plate 31 and the transition sleeve 23. The forming platform 1 is in sliding sealing fit with the inner wall of the liquid tank body 21, can slide along the axis of the liquid tank body 21 and keeps sealing fit. The forming platform 1, the liquid tank 21 and the release plate 27 form a sealed working cavity, and the working cavity is communicated with a printing material source 59. The surface of the release plate 31 contacting the photosensitive material 5 is a release surface, and the surface of the curing model 51 contacting the release surface is a printing surface. In the printing process, the medium source 4 injects a liquid medium 71 with a set volume into the adsorption cavity, the transparent release plate 31 moves to the positioning portion 24 of the liquid tank 21 to be positioned, and is located at a printing working position, the printing material source 59 injects a photosensitive material 5 with a preset pressure into the working cavity, a set distance is formed between the forming platform 1 and the release plate 31, the light beam 39 selectively irradiates the photosensitive material 5 in the working cavity through the support plate 35, the liquid medium 71 and the release plate 31 to complete one-layer printing, the medium source 4 extracts the liquid medium 71 in the adsorption cavity, the release plate 31 moves away from the forming platform 1 under the pressure action of the photosensitive material 5 and can be attached to the support plate 35 to be limited, and is located at a peeling working position as shown in fig. 16, so that the separation (peeling) of the release plate 31 and the curing model 51 is realized. At the same time, the forming table 1 may be moved downward by a set distance as indicated by the arrow in the figure. The medium source 4 can then inject the liquid medium 71 into the adsorption cavity again to restore the printing position, as shown in fig. 15, so that the solidified layers solidified layer by layer are combined to form a solidified model 51, and the solidified model 51 is combined on the forming platform 1. Can promote photosensitive material 5 through the pressurization and flow back to the clearance of solidifying between layer and the type board for printing speed utilizes the pressure balance of photosensitive material and medium, and the level and smooth state of removable control type board promotes the printing precision.

Example 7

Fig. 17 and 18 show that it is also possible to provide an elastic element 47 (possibly also with an elastic seal 27) directly between the plate 31 and the plate 35, close to the transition sleeve 23, the elastic element 47 simultaneously acting as a seal, keeping the suction chamber sealed and separating it from the working chamber. When the medium source 4 draws the liquid medium 71, the pressure of the photosensitive material 5 will push the separation plate 31 to compress the elastic member 47 to move toward the transparent support frame 35. Fig. 18 shows that the releasing plate 31 can have a plurality of elastic members 47 with different elasticity, for example, in fig. 17 and 18, when the medium in the adsorption cavity is extracted, the releasing plate 31 will firstly compress the area with small acting force of the elastic member 47, i.e. the area with small elastic force of the elastic member 47 is firstly inclined and moved towards the direction of the supporting plate, the releasing plate 31 can be firstly inclined and separated from the curing mold at the separation working position, as shown in fig. 18, if the acting force on the right side of the elastic member 47 is smaller than that on the left side, the releasing plate 31 is firstly inclined and moved upwards on the right side, so that the separation acting force can be reduced and the separation speed can.

Example 8

Fig. 19 and 20 show that the forming platform 1 is fixedly connected and sealed with the liquid tank 21, the light-transmitting component comprises an ion plate 31 and a support plate 35, and the light-transmitting component is in sliding sealing fit with the inner wall of the liquid tank 21, for example, the light-transmitting component is in sliding sealing fit with the inner wall of the liquid tank through the ion plate 31 or a sliding sleeve 78. For example, a sealing ring 27 may be disposed between the supporting plate 35 and the releasing plate 31, the sealing ring 27 has elasticity, and the sealing ring 27 is engaged with and sealed with the inner wall of the liquid tank 21, so that the supporting plate 35 and the releasing plate 31 can slide along the liquid tank 21 and maintain a sealing engagement. The support plate 35, the release plate 31 and the sealing ring 27 form a sealed adsorption chamber. The centrifugal plate 31, the liquid tank 21 and the forming platform 1 form a sealed working cavity. In the printing process, the medium source 4 injects a liquid medium 71 with a preset volume into the adsorption cavity, the release plate 31 is located at a printing working position, the printing material source 59 is filled with the photosensitive material 5 with a preset pressure intensity in the working cavity, the light beam 39 irradiates the photosensitive material 5 in the working cavity to complete one-layer printing, the medium source 4 can extract the liquid medium 71, the release plate 31 can compress the sealing ring 27 under the pressure intensity of the photosensitive material 5 to form the release working position, and the curing model 51 is formed and combined on the forming platform 1 repeatedly. Fig. 19 also shows that a plurality of media sources 4 can be distributed around the circumference, and the release plate 31 can be moved obliquely toward the support plate by different speeds of the liquid media pumped out from the media sources 4. The support plate 35 can be moved away from the forming table 1. The difference between the structure shown in fig. 20 and fig. 19 is that the sealing ring 27 is disposed between the release plate 31 and the liquid tank 21, the elastic member 47 is further disposed between the release plate 31 and the support plate 35, and the release plate 31, the support plate 35 and the elastic member 47 form a sealed adsorption cavity. So do benefit to the reliability that promotes the sealed chamber and let elastic component 47 from type board 31 and backup pad 35 sealing connection, can let the mode of type board 31 slope removal peel off through the difference of effects such as elastic component 47 surrounding elasticity equally. The difference between the structure shown in fig. 21 and 22 and the solution shown in fig. 20 is that the elastic member 47 is eliminated, another sealing ring 27-2 is arranged between the supporting plate 35 and the liquid tank body 21, and a sealed adsorption cavity is formed among the release plate 31, the supporting plate 35 and the liquid tank body 21. Therefore, the separation plate 31 and the supporting plate 35 can relatively independently slide in the liquid tank body, and the position of the separation plate 31 can be controlled as long as the volume of the liquid medium in the adsorption cavity is controlled by using the medium source 4, so that the flexible control of the printing working position and the stripping working position is realized. The support plate 35 in each embodiment may be controlled to move by a drive mechanism (not shown). The embodiment shown in fig. 19 to 22 controls the alternation of the separation plate between the printing working position and the stripping working position by controlling the volume of the medium in the adsorption cavity, so that the positioning part 24 is not needed, and the structure is simpler.

Example 9

Fig. 23 and fig. 24 show that the supporting plate 35 is fixedly connected with the sliding sleeve 78, the sliding sleeve is in sliding sealing fit with the inner wall of the liquid tank 21, a sealing ring 27-1 can be arranged between the sliding sleeve and the inner wall of the liquid tank 21, the release plate 31 is in sliding sealing fit with the inner wall of the sliding sleeve 78, and a sealing ring 27-2 can be arranged between the release plate 31 and the sliding sleeve 78. The centrifugal plate 31, the support plate 35 and the sliding sleeve 78 form a sealed suction chamber. The sliding sleeve 78 can be understood as a part of the support plate 35, which corresponds to the support plate 35 being formed turned upwards. The centrifugal plate 31, the sliding sleeve 78, the liquid tank 21 and the forming platform 1 form a sealed working cavity, and the working cavity is filled with photosensitive material 5 with set pressure. In fig. 23, the medium source 4 injects a predetermined volume of liquid medium 71 into the adsorption cavity, and the release plate 31 is moved and positioned by the positioning portion 24 disposed on the side of the sliding sleeve 78 facing the forming platform 1 away from the supporting plate 35, so as to realize the printing position. In addition, an elastic member 47 may be provided in an extension between the off-plate and the support plate 35 as shown in fig. 24, so that the sealed chamber 27-2 between the off-plate 31 and the sliding sleeve 78 may be eliminated. In the printing process, the light beam 39 penetrates through the selective photosensitive material 5 of the adsorption cavity to form a solidified layer, then the medium source 4 extracts the liquid medium in the adsorption cavity, the release plate moves to the supporting plate 35 under the action of the pressurized photosensitive material 5 and is switched to a stripping working position, and certainly, the elastic piece 47 can have different acting forces along the circumference of the release plate 31 when being compressed, or a plurality of elastic pieces 47 are arranged on the circumference, the acting force (elastic force) of the elastic piece on one side is larger than that on the other side, so that the release plate 31 can obliquely move to be stripped from the solidified model 51, and the stripping force is reduced. The sliding sleeve 78 can drive the separation plate 31 and the supporting plate 35 to move together, the structure is more stable, and in addition, the positioning part 24 at the upper end of the sliding sleeve 78 can be used for more accurately controlling the leveling state and the position of the printing working position of the separation plate 31. It is also possible to provide a through hole in the sliding sleeve 78 as shown in the figure, through which the printing material source 59 communicates with the printing work chamber, so that it is possible to avoid providing a through hole in the bath body 21, and to easily achieve the input of the photosensitive material even in the initial stage of printing, i.e., in a state where the release plate 31 is in close contact with the forming table 1. In the figure, a boss 13 is further arranged on the side, facing the release plate, of the forming platform 1, and the curing mold 51 is combined on the boss 13, so that the positioning part 24 of the sliding sleeve 78 can be embedded into the periphery of the boss 13 at the initial stage of printing, and the gap between the release plate 31 and the forming platform 1 can be controlled arbitrarily. The embodiments shown in fig. 19-24 may also be similarly formed to the simultaneous two-sided printing embodiment shown in fig. 13 and 14.

Fig. 26 illustrates a flow chart of a three-dimensional photocuring printing method, in which a printer is started to import three-dimensional model information and corresponding layer pattern information, a preset distance is provided between the molding platform 1 and a release member (e.g., a release film 33 or a release plate 31), and the release member is in a printing station, i.e., in a state where photocuring can be performed, such as a flat planar state. Then the light beam 39 selectively irradiates the photosensitive material 5 through the parting member to complete the illumination and solidification of the current layer pattern, after a layer is solidified, the medium source extracts the transparent liquid medium in the adsorption cavity, the parting member is a stripping working position, and the parting member can be attached to the supporting plate. In the stripping working position, the pressure of the photosensitive material 5 can be synchronously increased, so that the stripping (separation) of the curing model and the release piece is accelerated. At the same time, the distance between the forming table 1 and the release element can be increased, for example, the forming table 1 is moved in a direction away from the release element until a predetermined distance, for example, the layer thickness of the cured layer, is reached. Then, a medium source injects a liquid medium with a set volume into the adsorption cavity, the release piece is a printing work position, and the pressure of the photosensitive material 5 in the printing work position can be synchronously adjusted back to accelerate the release piece to return to a flat state; the print side of the curing mould 51 is moved to a print layer thickness distance from the profile. And introducing the layer pattern of the next layer, wherein the layer pattern of the next layer becomes the current layer pattern, repeating the steps to ensure that the light beam 39 selectively irradiates the photosensitive material 5 through the parting piece, and repeating the steps until the three-dimensional model is printed.

Generally, during printing, the release member (release film 33 or release plate 31) is alternately in two states, namely a planar state of the printing station, and a peeling station, such as a state that the release film 33 deforms and protrudes toward the support plate 35, or the release plate 31 moves toward the support plate 35, although the release plate 31 may slightly deform and protrude toward the support plate 35, and the switching between the two states is controlled by the media source 4. In addition, in the process of stripping the release film or the release plate from the curing model, the vacuum degree or the pressure intensity in the adsorption cavity can be monitored, and whether the release film or the release plate is separated from the curing model or not is judged according to the change of the vacuum degree or the pressure intensity. For example, a sensor 77 may be provided in the line 45 or the adsorption chamber 38, and the sensor 77 may be used to detect a vacuum or pressure within the adsorption chamber 38, such as shown in FIG. 1. When the vacuum degree or the pressure intensity changes suddenly, for example, the vacuum degree decreases rapidly or the pressure intensity increases rapidly, it indicates that the separation between the release film 33 or the release plate 31 and the curing model 51 is achieved, and then the peeling station can be stopped, i.e., the medium source 4 can start to inject the liquid medium with the set volume into the adsorption cavity, so that the release film 33 or the release plate 31 is restored to the flat printing station, and thus the separation speed and the printing speed can be further increased. For example, the patterns of different cured layers may be different, the time required for separation may be different, and time may be saved by monitoring the peeling state, thereby increasing the printing speed.

Fig. 27 shows the profile of the distance S between the forming table 1 and the release film or plate and the volume Q of the liquid medium in the adsorption chamber 38 (e.g. the medium source 4, if a plunger pump, can be represented by the displacement of the plunger 76) over time t. The left ordinate in the figure represents the spacing S between the forming table 1 and the release element (release film 33 or release plate 31), the right ordinate represents the volume Q of the liquid medium in the adsorption chamber 38, and the abscissa represents the time t. The time periods t1 and t2 in the figure illustrate one layer printing process, and the entire printing process is a repeated process of a plurality of layer printing processes. In the process of t1, the light beam selectively irradiates the photosensitive material 5 to form a cured layer, the medium source 4 injects a liquid medium with a preset volume into the adsorption cavity, the release film is a printing working position, a printing layer thickness distance delta is formed between the printing surface of the cured model 51 and the release film 33 or the release plate 31, and at the moment, the light beam 39 can selectively irradiate and cure the photosensitive material in the working cavity to form the cured model 51. The solidification model 51 or the forming platform 1 or the supporting plate 35 directly move to the preset position in a one-way mode, the reciprocating motion process can be avoided, namely, the solidification model 51 or the forming platform 1 or the supporting plate 35 keeps moving in a one-way mode in the process of moving to the preset position of the printing of the next layer, the distance between the printing surface of the solidification model 51 and the printing working position of the release film 33 or the release plate 31 is preset until the printing surface of the solidification model 51 and the printing working position of the release film 33 or the release plate 31 are reached, so that the time can be saved more, the faster printing speed can be realized, the reciprocating motion of the forming platform 1 is cancelled, the influence of the gap (such as the backlash or the backlash) of the. At the stage t2, the liquid medium in the adsorption cavity is rapidly reduced, that is, the liquid medium in the adsorption cavity is rapidly pumped out by the medium source 4, the release film 33 or the release plate 31 is deformed towards the support plate 35 under the pressure of the photosensitive material 5 and is possibly attached to the support plate 35, so that the release surface is peeled from the curing mold 51, the photosensitive material 5 fills and reflows to the gap between the release surface and the printing surface of the curing mold 51, and then the next stage t1 is carried out. In addition, the curing model 51 or the forming platform 1 can move for a large distance first and then move back to a preset position, namely the curing model 51 is peeled in a reciprocating motion mode, a larger gap between the curing model and a release surface can be realized, peeling and backflow of photosensitive materials in the printing process of the large model are facilitated, the reciprocating movement distance of the curing model 51 can be greatly reduced by adopting the method disclosed by the invention, and the printing speed can still be improved for the large model.

The distance between the release film 33 or the release plate 31 and the support plate 35 can be determined by experiments, and may be different according to the area size and material difference of the release film 33 or the release plate 31. Generally, the distance should be as long as possible to ensure reliable separation of the release film 33 or the release sheet 31 from the curing mold 51, and possibly without damage or reduced life of the release film 33 due to excessive deformation.

The light curing light source can adopt 355nm or 405nm ultraviolet light to carry out ultraviolet light curing or different light sources such as 405nm to 600nm visible light to carry out visible light curing according to the specific characteristics of the photosensitive material. The light imaging device can be realized by adopting a plurality of modes such as SLA (stereo Lithography), DLP (digital light processing), Laser scanning (Laser), LED screen, LCD screen and the like, and can also utilize screens such as mobile phone screen, IPAD screen, other display screens and the like as imaging light sources, and certainly, the light can also be adjusted by matching with corresponding mirror groups.

The photosensitive material of the invention is any photosensitive resin liquid which can initiate polymerization reaction under illumination, powder materials such as ceramic powder, metal powder, plastic powder or other powder materials can be mixed in the resin liquid, and cells, medicines, pigments and the like can be mixed in the resin.

The description uses directional terms such as "above," "below," "left," "right," etc., for convenience in description based on the specific drawings, and not for limitation of the invention. In practical applications, the actual upper or lower position may differ from the figure due to the spatial variation of the structure as a whole. But such variations are intended to be within the scope of the invention.

Claims

1. The utility model provides a from type device based on absorption chamber, includes liquid groove body (21) and non-light tight from type board (31), inside photosensitive material (5) of being equipped with of liquid groove body (21), light beam (39) see through from type board (31) selective irradiation photosensitive material (5) successive layer and print shaping solidification model (51), solidification model (51) and from type between board (31) are printing the controllable relative removal of keeping away from of in-process, its characterized in that one by one: a light-permeable supporting plate (35) is arranged on the other side, opposite to the curing model (51), of the release plate (31), a gap exists between the supporting plate (35) and the release plate (31), the absorbing cavity (38) is formed in a sealed mode, the absorbing cavity (38) is communicated with a medium source (4), the medium source (4) injects a preset volume of light-permeable liquid medium (71) into the absorbing cavity or extracts the preset volume of liquid medium (71), so that the release plate (31) is alternated between a printing working position and a peeling working position, when the medium source (4) injects a preset volume of liquid medium (71) into the absorbing cavity, the release plate (31) moves to the printing working position, and a light beam (39) selectively irradiates the photosensitive material (5) through the supporting plate (35), the absorbing cavity (38) and the release plate (31); when the separation plate (31) is at a separation working position, the medium source (4) extracts the liquid medium (71) in the adsorption cavity (38), the separation plate (31) moves towards one side of the supporting plate (35) and is separated from the solidification model (51), and the outward movement of the separation plate (31) is limited through the supporting plate (35).

2. The utility model provides a from type device based on absorption chamber, includes liquid groove body (21) and non-light tight from type board (31), inside photosensitive material (5) of being equipped with of liquid groove body (21), light beam (39) see through from type board (31) selective irradiation photosensitive material (5) successive layer and print shaping solidification model (51), solidification model (51) and from type between board (31) are printing the controllable relative removal of keeping away from of in-process, its characterized in that one by one: the device is characterized by further comprising a positioning part (24), a light-permeable supporting plate (35) is arranged on the other side, opposite to the curing model (51), of the release plate (31), a gap exists between the supporting plate (35) and the release plate (31), an adsorption cavity (38) is formed in a sealing mode, the adsorption cavity (38) is communicated with a medium source (4), the medium source (4) injects a light-permeable liquid medium (71) into the adsorption cavity or extracts the liquid medium (71), so that the release plate (31) is alternated between a printing working position and a peeling working position, the medium source (4) injects a light-permeable liquid medium (71) with a preset volume or pressure into the adsorption cavity, the release plate (31) moves to the printing working position, and the printing working position of the release plate (31) is positioned through the positioning part (24); light beam (39) are transmitted through a support plate (35), an adsorption cavity (38) and a release plate (31) to selectively irradiate photosensitive material (5), when the release plate (31) is stripped at a working position, a medium source (4) extracts a light-transmitting liquid medium in the adsorption cavity (38), the release plate (31) moves towards one side of the support plate (35) and is stripped from a curing model (51), and the outward movement of the release plate (31) is limited through the support plate (35).

3. The release device based on the adsorption cavity according to claim 2, wherein: the positioning part (24) is the end part of the liquid tank body (21), or the positioning part (24) is arranged on the inner wall of the liquid tank body (21).

4. An adsorption chamber based release device according to claim 1 or 2, wherein: and a plurality of openings (28) connected with the medium source (4) are formed in two opposite sides of the adsorption cavity (38), and when the centrifugal plate (31) is used for stripping, the openings (28) on one side of the adsorption cavity (38) draw out the liquid medium (71) in the adsorption cavity (38) before the openings on the other side.

5. An adsorption chamber based release device according to claim 1 or 2, wherein: an elastic part (47) is arranged between the separation plate (31) and the supporting plate (35), the elastic part (47) is arranged along two opposite sides of the separation plate (31), and the elastic force of the elastic part on one side is greater than that of the elastic part on the other side.

6. The release device based on the adsorption cavity according to claim 2, wherein: an elastic sealing piece (27) is arranged between the positioning part (24) and the release plate (31); the sealing element (27) has a greater elastic force along one side of the release plate than along the opposite side.

7. An adsorption chamber based release device according to claim 1 or 2, wherein: the device is characterized by also comprising a forming platform (1) and a light-transmitting component, wherein the liquid tank body (21) is of a cylinder sleeve structure, and the light-transmitting component comprises the centrifugal plate (31) and the corresponding supporting plate (35); the forming platform (1) is fixedly connected with the liquid tank body (21) or the frame (91), the forming platform (1) and the liquid tank body (21) are kept sealed in the printing process, the light-transmitting component is in sliding sealing fit with the inner wall of the liquid tank body (21), the forming platform (1), the liquid tank body (21) and the light-transmitting component form a sealed printing working cavity, the printing working cavity is communicated with a printing material source (59), and the printing material source (59) fills photosensitive material (5) with preset pressure into the working cavity; or, the supporting plate (35) of the light-transmitting component is fixedly connected with the liquid tank body (21) or the frame (91), the light-transmitting component and the liquid tank body (21) are kept sealed in the printing process, the forming platform (1) is in sliding sealing fit with the inner wall of the liquid tank body (21), the forming platform (1), the liquid tank body (21) and the light-transmitting component form a sealed printing working cavity, the printing working cavity is communicated with the printing material source (59), and the printing material source (59) fills the photosensitive material (5) with preset pressure into the working cavity.

8. An adsorption chamber based release device according to claim 1 or 2, wherein: the pipelines for injecting and extracting the liquid medium are provided with radiators.

9. An adsorption chamber based release device according to claim 1 or 2, wherein: the printing liquid tank is characterized in that a first light-transmitting component (20-1) and a second light-transmitting component (20-2) are respectively arranged on two sides of a curing model (51) in the liquid tank body (21), the first light-transmitting component (20-1) and the second light-transmitting component (20-2) are respectively in sliding sealing fit with the inner wall of the liquid tank body (21), the first light-transmitting component (20-1), the second light-transmitting component (20-2) and the liquid tank body (21) form a sealed working cavity, the working cavity is communicated with a printing material source (59), the printing material source (59) fills photosensitive material (5) with preset pressure into the working cavity, and a first adsorption cavity of the first light-transmitting component (20-1) and a second adsorption cavity of the second light-transmitting component (20-2) are respectively communicated with a medium source.

10. An adsorption chamber based release device according to claim 1 or 2, wherein: the printing device further comprises a forming platform (1), wherein the forming platform (1) is fixedly connected with the liquid tank body (21) or the frame (91), sealing is kept between the forming platform (1) and the liquid tank body (21) in the printing process, and the printing device further comprises a light-transmitting assembly, and the light-transmitting assembly comprises the separation plate (31) and the corresponding supporting plate (35); the light-transmitting component is in sliding seal fit with the inner wall of the liquid tank body (21), the forming platform (1), the liquid tank body (21) and the light-transmitting component form a sealed working cavity, the working cavity is communicated with a printing material source (59), and the printing material source (59) fills photosensitive material (5) with preset pressure intensity into the working cavity; printing opacity subassembly includes from template (31) and corresponding backup pad (35), still include sliding sleeve (78), sliding sleeve (78) links firmly with backup pad (35), sliding sleeve (78) and the inner wall sliding seal cooperation of cistern body (21), from the inner wall sliding seal cooperation of template (31) and sliding sleeve (78) location is fixed a position from the printing work position of template (31) to location of locating portion (24) that backup pad (35) department set up is kept away from towards forming platform (1) to sliding sleeve (78), from template (31), sliding sleeve (78) and backup pad (35) formation sealed absorption chamber.

11. The release method based on the adsorption cavity is characterized in that a photocuring three-dimensional printing device is adopted and comprises a liquid tank body (21) and a light-permeable release film (33), wherein photosensitive materials (5) are arranged in the liquid tank body (21), light beams (39) selectively irradiate the photosensitive materials (5) through the release film (33) to print a formed curing model (51) layer by layer, the curing model (51) and the release film (33) are controllably and relatively far away from each other in the layer-by-layer printing process, a light-permeable supporting plate (35) is arranged on the other side of the release film (33) relative to the curing model (51), a gap exists between the supporting plate (35) and the release film (33), a supporting ring (26) is arranged between the supporting plate (35) and the release film (33), and a sealed adsorption cavity (38) is formed among the supporting plate (35), the supporting ring (26) and the release film (33), the adsorption cavity (38) is communicated with a medium source (4), the medium source (4) injects a light-permeable liquid medium with preset volume or pressure into the adsorption cavity or extracts the liquid medium, so that the release film (33) is alternated between a printing working position and a peeling working position, the medium source (4) injects a light-permeable liquid medium (71) with preset volume or pressure into the adsorption cavity, when the release film (33) is in the printing working position, the release film (33) is in a plane structure, and the light beam (39) selectively irradiates the photosensitive material (5) through the release film (33); when the release film (33) is in a peeling working position, the medium source (4) extracts the light-transmitting liquid medium in the adsorption cavity (38), one side of the release film (33) facing the supporting plate (35) generates a deformation bulge and peels off the curing model (51), and the outward bulge of the release film (33) is limited through the supporting plate (35), and the method comprises the following steps:

step (1): when the release film (33) is positioned at a printing working position, selectively irradiating the photosensitive material (5) through the support plate (35), the adsorption cavity (38) and the release film (33) by a light beam (39) according to a layer pattern of the curing model (51) to be cured to form a cured layer;

step (2): pumping out a light-transmitting liquid medium (71) in the adsorption cavity (38) through a medium source (4), so that the release film (33) protrudes towards one side of the support plate (35) to deform and is peeled from the curing model (51), and injecting the liquid medium (71) with preset volume or pressure into the adsorption cavity (38) through the medium source (4) after peeling so that the release film (33) is restored to a printing working position;

and (3): controlling the solidified curing model (51) and the release film (33) to move relatively far away from each other to a preset distance;

and (4): repeating the steps (1) to (3), and printing layer by layer to obtain a finally formed curing model (51); the step (2) and the step (3) are carried out synchronously; or, firstly, carrying out the step (2) and then carrying out the step (3); alternatively, step (3) is performed first, and then step (2) is performed.

12. The release method based on adsorption cavity according to claim 11, characterized in that: and (4) in the step (3), the curing model (51) keeps moving in a single direction until the printing surface of the curing model (51) and the printing working position of the release film (33) reach a preset distance.

13. The release method based on adsorption cavity according to claim 11, characterized in that: in the step (2), in the process of pumping out the liquid medium in the adsorption cavity (38) by using the medium source (4), the separation condition between the release film (33) and the curing model (51) is judged by monitoring the vacuum degree or the pressure in the adsorption cavity (38), and when the separation between the release film (33) and the curing model (51) is detected, the stripping working position state is stopped.

14. An adsorption chamber-based release method, characterized in that the adsorption chamber-based release device of claim 1 or 2 is used, comprising the following steps:

step (1): when the release plate (31) is positioned at a printing working position, selectively irradiating the photosensitive material (5) through the support plate (35), the adsorption cavity (38) and the release plate (31) by a light beam (39) according to a layer pattern of the curing model (51) to be cured to form a cured layer;

step (2): pumping out a light-transmitting liquid medium (71) in the adsorption cavity (38) through a medium source (4), moving the centrifugal plate (31) towards one side of the support plate (35) to be stripped from the solidified model (51), and injecting the liquid medium (71) with preset volume or pressure into the adsorption cavity (38) through the medium source (4) after stripping so as to restore the centrifugal plate (31) to a printing working position;

and (3): controlling the solidified solidifying model (51) and the distance plate (31) to move relatively to a preset distance;

15. The release method based on adsorption cavity according to claim 14, characterized in that: in the process of peeling the separation plate (31) from the curing model (51), one side of the separation plate (31) is peeled and inclined from the curing model (51) and then the whole separation plate is separated from the curing model (51).