CN112497754B

CN112497754B - Liquid level adjusting method and system, 3D printing method and device and storage medium

Info

Publication number: CN112497754B
Application number: CN202011344613.9A
Authority: CN
Inventors: 马跃科; 于清晓; 杜迪坤; 马劲松; 徐静
Original assignee: Shanghai Union Technology Corp
Current assignee: Shanghai Union Technology Corp
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-06-07
Anticipated expiration: 2040-11-25
Also published as: CN112497754A

Abstract

The application discloses a liquid level adjusting method and system, a 3D printing method and device and a storage medium. The liquid level adjusting method comprises the steps that before a component platform in the process that a 3D printing device is to manufacture an nth layer of cross section moves, a first liquid level value of a photocuring material in a container is detected based on a preset first liquid level reference condition to obtain a first detection result, wherein n is greater than 0; and selectively outputting a first control instruction for adjusting the liquid level of the photocuring material in the container according to the first detection result during the movement of the component platform, wherein the first control instruction comprises first adjustment amount information corresponding to the liquid level change. This application can adjust the liquid level simultaneously during component platform removes, need not pause 3D and prints, has improved printing efficiency.

Description

Liquid level adjusting method and system, 3D printing method and device and storage medium

Technical Field

The present application relates to the field of 3D printing technologies, and in particular, to a method and a system for adjusting a liquid level, a method and an apparatus for 3D printing, and a storage medium.

Background

The photocuring 3D entity printing technology is one of rapid prototyping technologies, and is generally used for dividing a printing model into a plurality of cross-sectional layers by taking materials such as liquid photosensitive resin, photopolymer and the like as solidification materials, and then constructing an entity in a layer-by-layer printing mode.

During photocuring 3D printing, a curing material such as a resin material cannot be kept on a printing reference surface due to gradual consumption in the printing process, and thus, the liquid level of the resin material needs to be adjusted during printing so that the resin material can be kept on the printing reference surface for printing. At present, the liquid level of a resin material needs to be adjusted for multiple times during 3D printing, and printing needs to be suspended and then the current liquid level needs to be adjusted each time, so that the printing efficiency is greatly reduced.

Disclosure of Invention

In view of the above-mentioned shortcomings of the related art, it is an object of the present application to provide a liquid level adjustment method and system, a 3D printing method and apparatus, and a storage medium to solve the problem of the liquid level adjustment causing the reduction of 3D printing efficiency.

To achieve the above and other related objects, a first aspect of the present application discloses a liquid level adjusting method applied to a 3D printing apparatus, the 3D printing apparatus including a member platform and a container for containing a light curing material, the liquid level adjusting method including the steps of: before the 3D printing equipment moves a component platform in the process of manufacturing the nth cross-section layer, detecting a first liquid level value of a photocuring material in the container based on a preset first liquid level reference condition to obtain a first detection result; wherein n > 0; selectively outputting a first control instruction for adjusting a liquid level of a light-curing material in the container during movement of the component platform according to the first detection result, wherein the first control instruction comprises first adjustment amount information corresponding to a liquid level change.

The second aspect of the application discloses a liquid level control system is applied to 3D printing apparatus, liquid level control system includes: a storage unit for storing at least one program; and the processing unit is connected with the storage unit and used for reading the at least one program to execute the liquid level adjusting method.

A third aspect of the present application discloses a 3D printing method applied to a 3D printing apparatus, the 3D printing apparatus including an energy radiation system, a component platform, a container for containing a photocurable material, and a liquid level adjustment mechanism for adjusting a liquid level of the photocurable material in the container, the 3D printing method including: acquiring a first level value of a photocuring material in the container before a component platform of the 3D printing equipment moves in the process of manufacturing the nth layer of cross section; detecting the first liquid level value based on a preset first liquid level reference condition to obtain a first detection result; controlling the component platform to move for a preset distance, and selectively outputting a first control instruction for adjusting the liquid level of the photocuring material in the container according to the first detection result during the movement of the component platform so as to control the liquid level adjusting mechanism to adjust the liquid level of the photocuring material in the container according to the first control instruction, wherein the first control instruction comprises first adjustment amount information corresponding to liquid level change; and controlling the energy radiation system to cure the nth cross-sectional layer on the component platform.

A fourth aspect of the present application discloses a 3D printing apparatus, comprising: a container for holding a photocurable material; an energy radiation system for irradiating the photo-curable material in the container to obtain a pattern cured layer; a member stage for attaching the irradiation-cured pattern cured layer; the Z-axis driving mechanism is connected with the component platform and used for controllably moving along the vertical axial direction to adjust the distance between the component platform and the printing reference surface and filling the photo-curing material to be cured; a level sensor for detecting a level of photocurable material in the container; a liquid level adjustment mechanism for adjusting the level of the photocurable material in the container; and the control device is connected with the energy radiation system, the Z-axis driving mechanism, the liquid level sensor and the liquid level adjusting mechanism and is used for adhering and stacking the pattern curing layer on the component platform to obtain the corresponding three-dimensional object by executing the 3D printing method.

A fifth aspect of the present application discloses a storage medium of a computer device storing at least one program which, when executed by a processor, performs the above-described liquid level adjustment method; alternatively, the program executes the 3D printing method described above when executed by a processor.

In summary, the present application provides a liquid level adjusting method and system, a 3D printing method and apparatus, and a storage medium, which improve printing efficiency by selectively outputting a first control command for adjusting a photocurable material in a container during movement of a member platform according to a first detection result obtained based on a first liquid level reference condition and a first liquid level value before the member platform moves during a process of manufacturing an nth cross-section layer so that liquid levels can be simultaneously adjusted during the movement of the member platform without pausing 3D printing.

Drawings

The specific features of the invention to which this application relates are set forth in the appended claims. The features and advantages of the invention to which this application relates will be better understood by reference to the exemplary embodiments described in detail below and the accompanying drawings. The brief description of the drawings is as follows:

FIG. 1 is a schematic flow chart of a liquid level control method according to an embodiment of the present disclosure.

FIG. 2 is a schematic flow chart of another embodiment of the liquid level control method of the present application.

FIG. 3 is a schematic diagram showing the relationship between the liquid level silence interval and the liquid level set interval in the liquid level regulation method of the present application.

FIG. 4 is a schematic structural diagram of a fluid level regulating system according to an embodiment of the present disclosure.

Fig. 5 is a schematic flow chart of a 3D printing method according to an embodiment of the present application.

Fig. 6 is a schematic flowchart of another embodiment of the 3D printing method according to the present application.

Fig. 7 is a schematic structural diagram of a 3D printing apparatus according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a 3D printing apparatus according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

Although the terms first, second, etc. may be used herein to describe various elements or parameters in some instances, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one element or parameter from another element or parameter. For example, the first level reference condition may be referred to as a second level reference condition, and similarly, the second level reference condition may be referred to as a first level reference condition, without departing from the scope of the various described embodiments. The first level reference condition and the second level reference condition are both describing one level reference condition, but they are not the same level reference condition unless the context clearly indicates otherwise. Similar situations also include a first level value and a second level value, a first detection result and a second detection result, and so on.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

3D printing is one of rapid prototyping technologies, and no matter DLP (Digital Light processing) equipment or SLA (Stereo Light curing molding) equipment, a component platform is used as a platform for 3D printing a solid component, and a 3D object is constructed in a layer-by-layer printing mode. When in printing, the light curing material is firstly irradiated through the energy radiation system to form a first curing layer, the first curing layer is attached to the component platform, and the component platform is driven by the Z-axis driving mechanism to ascend or descend for a preset distance.

In one embodiment, the 3D printing device is, for example, a DLP device, the energy radiation system of which is a projection device. For example, the projection device includes a DMD chip, a controller, and a memory module. Wherein the storage module stores therein a layered image layering the 3D component model. And after receiving the control signal of the controller, the DMD chip irradiates the light source of each pixel on the corresponding layered image to the bottom surface of the container or the surface of the light-cured material. In fact, the mirror is composed of hundreds of thousands or even millions of micromirrors, each micromirror represents a pixel, and the projected image is composed of these pixels. The DMD chip may be simply described as a semiconductor photo switch and a micromirror plate corresponding to the pixel points, and the controller allows/prohibits the light reflected from each of the micromirrors by controlling each of the photo switches in the DMD chip, thereby irradiating the corresponding layered image onto the photo-curable material directly or through the transparent bottom of the container, so that the photo-curable material corresponding to the shape of the image is cured to obtain the patterned cured layer.

In another embodiment, the 3D printing apparatus is, for example, an SLA apparatus, and the energy radiation system thereof includes a laser emitter, a lens group located on an outgoing light path of the laser emitter, and a lens group located on an outgoing light side of the lens group, wherein the laser emitter is controlled to adjust energy of an output laser beam, for example, the laser emitter is controlled to emit a laser beam with a preset power and stop emitting the laser beam, and for example, the laser emitter is controlled to increase power of the laser beam and decrease power of the laser beam. The lens group is used for adjusting the focusing position of the laser beam, the galvanometer group is used for controllably scanning the laser beam in a two-dimensional space on the surface or the bottom surface of the container, and the light-cured material scanned by the light beam is cured into a corresponding pattern cured layer.

In a further embodiment, the 3D printing device is, for example, an LCD (Liquid Crystal Display, Liquid Crystal area light source curing, abbreviated as LCD) device, and the energy radiation system is an LCD light source system. The LCD device comprises an LCD liquid crystal screen positioned above or below the container and a light source which is aligned above or below the LCD liquid crystal screen. And a control chip in the energy radiation device projects the layered image of the slice to be printed to a printing surface through an LCD screen, and the material to be cured in the container is cured into a corresponding pattern curing layer by using a pattern radiation surface provided by the LCD screen.

For a 3D printing device using a photo-curing material to manufacture a 3D component, during 3D printing, the liquid level of the photo-curing material needs to be kept at a printing reference surface for normal printing. Wherein the printing reference surface refers to a curable surface of the material to be molded. The distance of the printing reference plane from the emergent position of the energy radiation system is determined based on the spot size of the radiation beam radiated by the energy radiation system. In SLA-based printing devices the printing reference plane is the level of the material to be shaped. In actual operation, the light-cured material cannot be kept on the printing reference surface due to gradual consumption in the printing process, so that the liquid level height of the light-cured material needs to be adjusted during printing, so that the light-cured material can be kept on the printing reference surface for printing. The current-stage liquid level adjusting operation requires the liquid level of the resin material to be adjusted multiple times during 3D printing, and printing needs to be suspended to adjust the current liquid level each time of adjustment, so that the printing efficiency is greatly reduced.

In view of this, the present application provides a liquid level adjustment method for solving a problem of a reduction in 3D printing efficiency caused by liquid level adjustment, the liquid level adjustment method being applied to a 3D printing apparatus including a member platform and a container for containing a photocurable material.

Wherein the member platform is used for attaching the irradiation-cured pattern curing layer so as to form the 3D member through accumulation of the pattern curing layer. Specifically, the component platform is exemplified by a component plate. The component platform typically takes a preset printing reference surface located in the container as a starting position, and each solidified layer solidified on the printing reference surface is accumulated layer by layer to obtain a corresponding 3D printing component.

The container is used for containing light-cured materials. The volume of the container depends on the type of 3D printing device. In certain embodiments, the light-curable material includes any liquid or powder material susceptible to light curing, examples of which include: a photocurable resin liquid, or a resin liquid doped with a mixed material such as an additive, a pigment, or a dye. Powder materials include, but are not limited to: ceramic powder, color additive powder, etc. The materials of the container include but are not limited to: glass, plastic, resin, etc. In some implementations, the container is often referred to as a resin vat.

Referring to fig. 1, a schematic flow chart of an embodiment of the liquid level adjustment method according to the present application is shown, and as shown in the drawing, the liquid level adjustment method includes steps S101 and S102.

In step S101, before a component platform of a 3D printing apparatus moves during a process of manufacturing an nth layer of cross-section, detecting a first liquid level value of a photocurable material in a container based on a preset first liquid level reference condition to obtain a first detection result; wherein n > 0.

Wherein the process to produce the nth layer cross-section comprises all processes starting from the completion of the curing of the nth-1 th layer on the component platform until the completion of the curing of the nth layer on the component platform, wherein n > 0.

Taking the SLA device as an example, in one embodiment, the process to manufacture the nth cross-section layer comprises: after the n-1 th layer, for example, the ninth cured layer, is cured on the component platform, the component platform is driven by the Z-axis driving mechanism to descend for a predetermined distance, so that the photo-curing material to be cured is filled above the component platform again, and the energy radiation system irradiates again to obtain the tenth cured layer attached to the ninth cured layer.

In another embodiment, the 3D printing device is provided with a doctor mechanism for smoothing the material to be cured on the printing reference surface for the next photocuring operation before curing a layer of the material to be cured. In this case, the process to produce the nth cross-sectional layer comprises: after the (n-1) th layer, for example, the ninth cured layer, is cured on the component platform, the component platform is driven by the Z-axis driving mechanism to descend for a predetermined distance, so that the photo-curing material to be cured is filled above the component platform again, the scraper mechanism performs a leveling operation on the photo-curing material to be cured, and then the energy radiation system irradiates again to obtain the tenth cured layer attached to the ninth cured layer.

The first level value may be detected by a level sensor. The level sensor is an instrument for detecting the level of the photocurable material in the container. In one embodiment, the level sensor is a laser level sensor disposed above the vessel for detecting a level of photocurable material in the vessel. In particular, the laser level sensor detects the photocurable material in the region of the container edge that is not irradiated by the energy radiation system to obtain a more accurate level measurement. In another embodiment, the liquid level sensor may also be a liquid level measuring device, the liquid level measuring device includes a limiting member, a floating member and a distance measuring device, wherein the limiting member is used for communicating with the container so that the liquid level in the limiting member is the same as the liquid level in the container, and a guide portion is arranged inside the limiting member; the floating piece is limited in an area by the limiting piece and floats along with the liquid level under the action of the guide part; wherein the guide portion is used for preventing the floating piece from being adhered; the distance measuring device is arranged above the floating piece so as to obtain the liquid level by measuring the position of the floating piece.

It should be noted that the above liquid level sensor and its mounting position are merely examples, and the present application is not limited thereto. The level sensor may also be other types of sensors and located elsewhere so long as it is capable of detecting the level of photocurable material in the container.

The first liquid level value refers to a liquid level value of a photocuring material in a container before a component platform moves in the process that the 3D printing equipment is used for manufacturing the nth cross-section layer. Based on this, in an embodiment, the liquid level sensor may detect a current liquid level value as the first liquid level value before the member platform moves during the 3D printing device is to manufacture the nth cross-sectional layer. In order to improve the accuracy of the detected liquid level, in another embodiment, the liquid level sensor may further detect the liquid level value of the light-cured material in the container multiple times before the component platform moves during the process of manufacturing the nth layer of the cross-section by the 3D printing device, and process the obtained multiple liquid level values to obtain the first liquid level value, for example, average the obtained multiple liquid level values and use the average value as the first liquid level value, or screen the obtained multiple liquid level values, remove a value with a larger error, and average the screened liquid level value as the first liquid level value. In yet another embodiment, the level sensor may further acquire a level value of the photocurable material in the container in real time, and obtain the first level value based on at least one level value acquired in real time. Specifically, the liquid level sensor acquires the liquid level value of the photocuring material in the container in real time during 3D printing, and when the 3D printing device is to manufacture the nth cross-sectional layer, all the liquid level values acquired in real time are screened to obtain one or more liquid level values before the component platform moves in the process of manufacturing the nth cross-sectional layer, in one example, one liquid level value is acquired, and the liquid level value is taken as the first liquid level value. In another example, a plurality of level values are obtained, the obtained plurality of level values are processed to obtain the first level value, for example, the obtained plurality of level values are averaged and the average value thereof is used as the first level value, or the obtained plurality of level values are filtered, a value with a larger error is removed, and the filtered level values are averaged and used as the first level value.

The first liquid level reference condition is preset for measuring the condition of the obtained first liquid level value of the photocuring material in the container so as to selectively perform subsequent liquid level adjustment operation. In an embodiment, the first liquid level reference condition includes a preset first liquid level reference parameter, and a determination criterion for measuring a deviation degree between the first liquid level value and the first liquid level reference parameter.

The first liquid level reference parameter refers to a numerical value which the liquid level needs to reach when 3D printing is carried out. The first liquid level reference parameter is set according to the process parameters of the 3D printing equipment and is related to the printing reference surface. The criterion for measuring the degree of deviation between the first level value and the first level reference variable may be characterized by whether the deviation between the first level value and the first level reference variable is within a preset interval. The preset interval can be called a liquid level silent interval, and a corresponding liquid level adjusting mode is determined according to whether the first liquid level value is in the liquid level silent interval or not. The liquid level silence interval may be set according to experience of a person skilled in the art based on the 3D printing process parameters, or may be set based on parameters of a liquid level sensor for detecting a liquid level height of the photocurable material in the container, so that the number of times of adjusting the liquid level according to the liquid level silence interval can be increased as much as possible under the condition that the relationship between the first liquid level value and the liquid level silence interval is accurately obtained, and the 3D printing efficiency is improved. In this case, the first detection result obtained by detecting the first level value of the photocurable material in the container based on the preset first level reference condition may take two forms, that is, the deviation between the first level value and the first level reference parameter is within the level silence interval, and the deviation between the first level value and the first level reference parameter is not within the level silence interval. Therefore, the first detection result can be characterized in a 'yes/no' mode, and different liquid level adjusting modes are correspondingly provided according to whether the deviation between the first liquid level value and the first liquid level reference parameter is in the liquid level silence interval. In addition, the first detection result may also be characterized in a form including a first level value, a first level reference condition.

It should be noted that the above-mentioned characterization form of the first detection result is only an example, and the application is not limited thereto. The first detection result may be in other forms, as long as a person skilled in the art can obtain different liquid level adjustment modes according to different first detection results.

In step S102, a first control command for adjusting a level of the photocurable material in the container is selectively output according to the first detection result during the movement of the component stage. Wherein the first control instruction comprises first regulating quantity information corresponding to liquid level change.

And outputting a first control instruction for adjusting the liquid level of the photocuring material in the container to a liquid level adjusting mechanism of the 3D printing equipment so as to control the liquid level adjusting mechanism to adjust the liquid level of the photocuring material in the container. In one embodiment, the liquid level adjusting mechanism comprises a balance weight mechanism, and the first control instruction adjusts the liquid level height of the light-curing material in the container by controlling the lifting motion of the balance weight in the container. In another embodiment, the liquid level adjusting mechanism comprises a pumping pump mechanism, wherein a pumping pump in the pumping pump mechanism is respectively connected with the container and the liquid replenishing device through a conduit, and the first control instruction is used for adjusting the liquid level height of the photocuring material in the container by controlling the operation of the pumping pump. Wherein the pumping pump is a peristaltic pump, an impeller pump, a gear pump, a diaphragm pump, a screw pump or a piston pump.

It should be noted that the above-described counterbalance mechanism and pumping pump mechanism are examples only, and the present application is not limited thereto. The liquid level regulating mechanism can also be in other forms as long as the liquid level regulation of the photocuring material in the container can be realized.

The first regulating quantity information refers to information on the basis of which the liquid level regulating mechanism can operate to regulate the liquid level to a target liquid level, wherein the target liquid level refers to a liquid level value closer to a first liquid level reference parameter in a liquid level silence interval. For example, in the case where the liquid level adjustment mechanism includes a weight mechanism, the first adjustment amount information includes weight movement amount information. In the case where the liquid level adjustment mechanism includes a pumping pump mechanism, the first adjustment amount information includes pumping pump operating parameter information.

In one embodiment, the first adjustment amount information is determined based on the first detection result. For example, the fluid infusion amount may be obtained from the first level value and the first fluid level reference parameter included in the first detection result, and then converted into adjustment amount information that can represent an operating parameter of the fluid level adjustment mechanism.

In another embodiment, the first adjustment amount information is a preset fixed value. The fixed value may be set based on the process parameters of the 3D printing apparatus according to the experience of a person skilled in the art, as long as the adjusted first level value can be brought closer to the first level reference parameter in the first level reference condition. In addition, the fixed value can be set according to the unit adjustment amount of the liquid level adjusting mechanism and the parameters of the liquid level sensor. For example, a fixed value may be set depending on the resolution of the level sensor. In a specific example, the fixed value may be set at a value of 1/3 for the level sensor resolution. In another example, the fixed value may be set at a value of one time the resolution of the level sensor.

For convenience of description, the liquid level adjusting mechanism in the 3D printing apparatus is described as a balance weight mechanism, but the application is not limited thereto. In one embodiment, the first level value is determined based on at least one level value obtained in real time, the first detection result is characterized in the form of yes/no, and the first adjustment amount information is a preset fixed value. In this example, before the component stage moves during the 3D printing apparatus is to manufacture the nth cross-section layer, when it is determined that the deviation between the first level value and the first level reference parameter is not within the level silence interval, a first detection result of "no" is output, and during the movement of the component stage, a first control instruction including information of a fixed movement amount of the weight is output according to the detection result of "no" described above. This first control command is exported balance weight mechanism to fixed amount of movement of rising or descending is controlled to balance weight mechanism based on this instruction, makes balance weight mechanism adjust the liquid level of photocuring material in the container simultaneously during the component platform is removing, owing to need not suspend 3D printing process and carry out liquid level control, and then has improved 3D printing efficiency. When it is determined that the deviation between the first level value and the first level reference parameter is within the silence interval, outputting a first detection result of "yes", and outputting a first control command including information that the amount of movement of the weight is zero, during movement of the component platform, in accordance with the detection result of "yes". The first control instruction is output to the balance weight mechanism to control the balance weight mechanism not to move based on the instruction.

It should be noted that the output form of the first detection result, the information contained in the first control instruction, and the acquisition form of the first adjustment amount information are merely examples, and the present application is not limited thereto. The first detection result may also be in a form including a first level value and a first liquid level reference condition, the first adjustment amount information may be adjustment amount information obtained after processing the first detection result, the first control instruction may further include information on whether to control the liquid level adjustment mechanism to be activated to adjust the liquid level of the photocurable material in the container, and any combination may be performed as long as a person skilled in the art can obtain a control instruction for adjusting the liquid level based on the first liquid level reference condition and the first level value of the photocurable material and then adjust the operation of the liquid level adjustment mechanism according to the control instruction.

According to the liquid level adjusting method, the first control instruction for adjusting the photocuring material in the container is selectively output during the movement of the component platform according to the first detection result obtained based on the first liquid level reference condition and the first liquid level value before the component platform in the process of manufacturing the nth layer of cross section moves, so that the liquid level can be adjusted simultaneously during the movement of the component platform, 3D printing does not need to be suspended, and the printing efficiency is improved.

After the component platform moves for the preset distance, the liquid level change of the photocuring material in the container is also influenced due to the movement of the component platform, so that the liquid level adjusting method further comprises liquid level adjustment after the component platform moves, and the liquid level of the photocuring material in the container is ensured to be on a printing reference surface when the next layer is printed.

Referring to fig. 2, a schematic flow chart of another embodiment of the liquid level adjustment method according to the present application is shown, wherein the liquid level adjustment method includes steps S201-S204.

In step S201, before the 3D printing apparatus moves to a component platform in a process of manufacturing an nth layer of cross-section, detecting a first liquid level value of a light-cured material in a container based on a preset first liquid level reference condition to obtain a first detection result; wherein n > 0.

Step S201 is similar to step S101, and is not described herein again.

In step S202, a first control command for adjusting a level of the photocurable material in the container is selectively output according to the first detection result during the movement of the component platform. Wherein the first control instruction comprises first regulating quantity information corresponding to liquid level change.

Step S202 is similar to step S102, and is not described herein again.

In step S203, after the 3D printing apparatus moves a preset distance while the member platform is about to manufacture the nth cross-sectional layer, a second liquid level value of the light-curing material in the container is detected based on a preset second liquid level reference condition to obtain a second detection result.

In addition, in the case that the 3D printing apparatus includes a scraper mechanism, step S203 includes detecting a second liquid level value of the photocurable material in the container based on a preset second liquid level reference condition after the member platform moves a preset distance and the scraper mechanism completes the coating work in the process that the 3D printing apparatus is to manufacture the nth cross-sectional layer, so as to obtain a second detection result.

Wherein the preset distance is preset according to the device parameters of the 3D printing and the model parameters of the 3D printing component. After the n-1 th layer is cured on the component platform, the component platform is driven by the Z-axis driving mechanism to descend and move for a preset distance, so that the light curing material to be cured is filled above the component platform again, and a subsequent energy radiation system irradiates again to obtain the attached n-th layer of the cross section.

The second liquid level value may be obtained by detecting with a liquid level sensor, and the obtaining manner of the second liquid level value is similar to that of the first liquid level value, which is not described herein again.

The second liquid level value refers to a liquid level value of the photocuring material in the container after the component platform moves a preset distance in the process that the 3D printing equipment is used for manufacturing the nth cross-section layer. Or the second liquid level value refers to a liquid level value of the photocuring material in the container after the component platform moves a preset distance and the scraper mechanism finishes coating work in the process that the 3D printing equipment is used for manufacturing the nth cross-section layer. Hereinafter, for convenience of description, it is exemplified that the 3D printing apparatus includes a blade mechanism, but the present application is not limited thereto.

In one embodiment, the liquid level sensor may detect a current liquid level value as the second liquid level value after the component platform moves a preset distance and the blade mechanism completes the coating work in the process that the 3D printing device is to manufacture the nth cross-section layer. In order to improve the accuracy of the detected liquid level, in another embodiment, the liquid level sensor may further detect the liquid level value of the photocurable material in the container multiple times after the component platform moves a preset distance and the scraper mechanism completes the coating work in the process that the 3D printing device is to manufacture the nth layer of the cross-section, and process the obtained multiple liquid level values to obtain the second liquid level value, for example, average the obtained multiple liquid level values and use the average value thereof as the second liquid level value, or screen the obtained multiple liquid level values, remove a value with a larger error, and average the screened liquid level value as the second liquid level value. In yet another embodiment, the level sensor may further acquire a level value of the photocurable material in the container in real time, and obtain the second level value based on at least one level value acquired in real time. Specifically, the liquid level sensor acquires the liquid level value of the photocuring material in the container in real time during 3D printing, and when the 3D printing device is used for manufacturing the nth cross-section layer, all the liquid level values acquired in real time are screened to obtain one or more liquid level values after the component platform moves a preset distance and the scraper mechanism completes coating work in the process of manufacturing the nth cross-section layer, in one example, one liquid level value is acquired, and the liquid level value is used as the second liquid level value. In another example, a plurality of level values are obtained, the obtained plurality of level values are processed to obtain the second level value, for example, the obtained plurality of level values are averaged and the average value is used as the second level value, or the obtained plurality of level values are filtered, a value with a larger error is removed, and the filtered level values are averaged and used as the second level value.

The second liquid level reference condition is preset and is used for measuring the condition of a second liquid level value of the photocuring material in the obtained container so as to selectively perform subsequent liquid level adjusting operation. In an embodiment, the second liquid level reference condition includes a preset second liquid level reference parameter, and a determination criterion for measuring a degree of deviation between the second liquid level value and the second liquid level reference parameter.

And the second liquid level reference parameter refers to a numerical value which the liquid level needs to reach when 3D printing is carried out. The second liquid level reference parameter is set according to the process parameters of the 3D printing equipment and is related to the printing reference surface. Specifically, the second liquid level reference parameter is the first liquid level reference parameter. The judgment standard for measuring the deviation degree between the second liquid level value and the second liquid level reference parameter can be represented by whether the deviation between the second liquid level value and the second liquid level reference parameter is within a preset interval or not. The preset interval can be called a liquid level setting interval, and a corresponding liquid level adjusting mode is determined according to whether the second liquid level value is in the liquid level setting interval. The liquid level setting interval can be set according to experience of a person skilled in the art based on process parameters of a 3D object to be printed by the 3D printing apparatus, for example, according to requirements of surface smoothness, dimensional accuracy and the like of the 3D object to be printed. Or may be set based on parameters of a level sensor for detecting the level of photocurable material in the container. In this case, the second detection result obtained by detecting the second level value of the photocurable material in the container based on the preset second level reference condition may take two forms, that is, the deviation between the second level value and the second level reference parameter is within the level setting range, and the deviation between the second level value and the second level reference parameter is not within the level setting range. Therefore, the second detection result can be represented in a 'yes/no' mode, and different liquid level adjusting modes are correspondingly arranged according to whether the deviation between the second liquid level value and the second liquid level reference parameter is within the liquid level setting interval or not. In addition, the second detection result may also be characterized in a form comprising a second level value, the second level reference condition.

It should be noted that the above-mentioned characterization form of the second detection result is only an example, and the present application is not limited thereto. The second detection result can be in other forms, as long as a person skilled in the art can obtain different liquid level adjusting modes according to different second detection results.

In addition, the liquid level silent interval can be set according to the liquid level setting interval, so that the number of times of adjusting the liquid level according to the liquid level silent interval can be increased by setting the interval, and the frequency of adjusting the liquid level in the liquid level setting interval is reduced. In an example, the liquid level silence interval is set to be in a range of one-quarter to one-half of the liquid level set interval, e.g., the liquid level silence interval is set to one-third of the liquid level set interval.

Please refer to fig. 3, which is a schematic diagram illustrating a relationship between a liquid level silence interval and a liquid level setting interval in the liquid level adjusting method of the present application. As shown, the dotted line n represents the current level value during printing, the interval between AB represents the level silence interval, and the interval between CD represents the level setting interval. As shown in the figure, the liquid level silence interval is included in the liquid level setting interval, and during 3D printing, when the current liquid level value n is within the liquid level setting interval, the printing condition is satisfied, and printing can be performed. According to the above, when the current liquid level value n is located in the liquid level silence interval, the liquid level is not required to be adjusted by the liquid level adjusting mechanism during the movement of the component platform in the process of manufacturing the nth layer of the cross section; when the current liquid level value n is positioned outside the silence interval and within the liquid level setting interval, adjusting the liquid level through a liquid level adjusting mechanism simultaneously during the movement of the component platform in the process of manufacturing the nth layer of cross section; when the current liquid level value n is located outside the liquid level setting interval, after the component platform in the process of manufacturing the nth layer of cross section moves for a preset distance, or after the component platform in the process of manufacturing the nth layer of cross section moves for the preset distance and the scraper mechanism finishes coating work, the liquid level is adjusted through the liquid level adjusting mechanism.

In step S204, a second control command for adjusting the liquid level of the light-curing material in the container is selectively output according to the second detection result, wherein the second control command includes second adjustment amount information corresponding to the liquid level change.

And outputting a second control instruction for adjusting the liquid level of the photocuring material in the container to a liquid level adjusting mechanism of the 3D printing equipment so as to control the liquid level adjusting mechanism to adjust the liquid level of the photocuring material in the container. The liquid level adjusting mechanism is as described above and will not be described in detail herein.

The second adjustment amount information is information on the basis of which the liquid level adjustment mechanism can operate to adjust the liquid level to a target liquid level, wherein the target liquid level is a liquid level value closer to a second liquid level reference parameter within a liquid level setting interval. For example, in the case where the liquid level adjustment mechanism includes a weight mechanism, the second adjustment amount information includes weight movement amount information. In the case where the liquid level adjustment mechanism includes a pumping pump mechanism, the second adjustment amount information includes pumping pump operating parameter information.

In one embodiment, the second adjustment amount information is determined based on the second detection result. For example, the fluid infusion amount may be obtained from the second level value and the second level reference parameter included in the second detection result, and then converted into adjustment amount information that can represent the operating parameter of the fluid level adjustment mechanism.

In another embodiment, the second adjustment amount information is a preset fixed value. The fixed value may be set based on the process parameters of the 3D printing device according to the experience of a person skilled in the art, as long as the adjusted second level value can be brought closer to the second level reference parameter in the second level reference condition. In addition, the fixed value can be set according to the unit regulating quantity of the liquid level regulating mechanism and the parameters of the liquid level sensor. For example, a fixed value may be set depending on the resolution of the level sensor.

For convenience of description, the liquid level adjusting mechanism in the 3D printing apparatus is described as a balance weight mechanism, but the application is not limited thereto. In one embodiment, it is exemplified that the first level value and the second level value are determined based on at least one level value obtained in real time, the first detection result is characterized in the form of yes/no, the first adjustment amount information is a preset fixed value, the second detection result includes the form of the second level value and the second level reference condition, and the second adjustment amount information is determined based on the second detection result. In this example, the adjustment of the liquid level during which the 3D printing device is to manufacture the nth cross-section layer is divided into two stages. Firstly, in a first stage, before a component platform moves in a process that a 3D printing device is to manufacture an n-th layer of a cross section, when the deviation between a first liquid level value and a first liquid level reference parameter is determined not to be in a liquid level silent interval, outputting a first detection result of 'no', and during the movement of the component platform, outputting a first control instruction according to the detection result of 'no', wherein the first control instruction comprises fixed movement amount information of a balance weight. The first control instruction is output to the balance weight mechanism to control the balance weight mechanism to ascend or descend for a fixed movement amount based on the instruction, so that the balance weight mechanism simultaneously adjusts the liquid level of the photocuring material in the container during the movement of the component platform. Then, in a second stage, after the component platform moves for a preset distance, or when the component platform moves for the preset distance and the scraper mechanism finishes coating work, when it is determined that the deviation between the second liquid level value and the second liquid level reference parameter is within the liquid level setting interval, the output second control instruction comprises information that the movement amount of the balance weight is zero, and the second control instruction is output to the balance weight mechanism so as to control the balance weight mechanism not to move based on the instruction. The energy radiation system is irradiated again to produce the n +1 th layer; or, when the deviation between the second liquid level value and the second liquid level reference parameter is determined not to be in the liquid level setting interval, the required liquid supplement amount can be obtained through calculation according to the second liquid level value and the second liquid level reference parameter, and then the second liquid level value and the second liquid level reference parameter are converted into regulating variable information capable of representing the movement amount of the balance weight mechanism, so that the balance weight mechanism is controlled to move based on the regulating variable information to adjust the liquid level. After the conditioning is completed, the energy radiation system is irradiated again to manufacture the n +1 th layer.

Or, in the first stage, when it is determined that the deviation between the first level value and the first level reference parameter is within the silence interval, outputting a first detection result of "no", and during the movement of the component platform, outputting a first control command including information that the amount of movement of the weight is zero, based on the detection result of "no". The first control instruction is output to the balance weight mechanism to control the balance weight mechanism not to move based on the instruction. Then, in a second stage, after the component platform moves for a preset distance, or when the component platform moves for the preset distance and the scraper mechanism finishes coating work, when it is determined that the deviation between the second liquid level value and the second liquid level reference parameter is within the liquid level setting interval, the output second control instruction comprises information that the movement amount of the balance weight is zero, and the second control instruction is output to the balance weight mechanism so as to control the balance weight mechanism not to move based on the instruction. The energy radiation system is irradiated again to produce the n +1 th layer; or when the deviation between the second liquid level value and the second liquid level reference parameter is determined not to be in the liquid level setting interval, the required liquid supplementing amount can be obtained through calculation according to the second liquid level value and the second liquid level reference parameter, and then the required liquid supplementing amount is converted into the regulating amount information capable of representing the movement amount of the balance weight mechanism, so that the balance weight mechanism is controlled to move based on the regulating amount information to carry out liquid level regulation. After the conditioning is completed, the energy radiation system is irradiated again to manufacture the n +1 th layer.

It should be noted that the output form of the first detection result and the second detection result, the information contained in the first control instruction and the second control instruction, and the obtaining form of the first adjustment amount information and the second adjustment amount information are only examples, and the application is not limited thereto. Any combination of the existing manners can be made as long as a person skilled in the art can obtain a control instruction for adjusting the liquid level based on the first liquid level reference condition and the first liquid level value of the light-cured material, and the second liquid level reference condition and the second liquid level value of the light-cured material, and then adjust the operation of the liquid level adjusting mechanism according to the control instruction.

According to the liquid level adjusting method, in the first stage, before the component platform in the process of manufacturing the nth cross-section layer moves, the first control instruction for adjusting the photocuring material in the container is selectively output during the movement of the component platform according to the first detection result obtained based on the first liquid level reference condition and the first liquid level value, so that the liquid level can be adjusted simultaneously during the movement of the component platform, 3D printing does not need to be suspended, and the printing efficiency is improved. In the second stage, after the component platform moves, a second control instruction for adjusting the photocuring material in the container is selectively output according to a second detection result obtained based on a second liquid level reference condition and a second liquid level value, on one hand, the liquid level is further ensured to be on a printing reference surface during printing, and the printing quality is improved, on the other hand, although 3D printing needs to be suspended during adjusting the liquid level in the second stage, due to the addition of the first stage, the liquid level of the photocuring material in the container is finely adjusted when each layer is printed, so that the liquid level is closer to a liquid level reference parameter, the frequency that the second liquid level value is outside a liquid level setting interval is reduced, namely, the frequency for suspending printing operation to adjust the liquid level is reduced, and the printing efficiency is further improved.

Referring to fig. 4, a schematic structural diagram of the liquid level regulating system of the present application in one embodiment is shown, and as shown in the figure, the liquid level regulating system includes a storage unit 41 and a processing unit 42. The storage unit 41 is used for storing at least one program. The memory unit includes a non-volatile memory and a system bus. The nonvolatile memory is, for example, a solid state disk or a usb disk. The system bus is used to connect the non-volatile memory with the CPU, wherein the CPU may be integrated in the memory unit or packaged separately from the memory unit and connected to the non-volatile memory through the system bus.

The processing unit 42 is connected to the memory unit 41. The processing unit includes: a CPU or a chip integrated with a CPU, a programmable logic device (FPGA), and a multi-core processor. The processing unit also includes memory, registers, and the like for temporarily storing data. The processing unit is adapted to read the at least one program to perform the liquid level adjustment method as described above.

The application also provides a 3D printing method, which is applied to 3D printing equipment, wherein the 3D printing equipment comprises an energy radiation system, a component platform, a container for containing the photocuring material and a liquid level adjusting mechanism for adjusting the liquid level of the photocuring material in the container.

Wherein the energy radiation system is used for irradiating the photo-curable material in the container to obtain the pattern cured layer.

The member platform is used for attaching the irradiation-cured pattern curing layer so as to form the 3D member through accumulation of the pattern curing layer. Specifically, the component platform is exemplified by a component plate. The component platform typically takes a preset printing reference surface located in the container as a starting position, and each solidified layer solidified on the printing reference surface is accumulated layer by layer to obtain a corresponding 3D printing component.

The liquid level regulating mechanism is used for regulating the liquid level of the photocuring material in the container. In one embodiment, the liquid level adjusting mechanism comprises a balance weight mechanism, and the first control instruction adjusts the liquid level height of the light-curing material in the container by controlling the lifting motion of the balance weight in the container. In another embodiment, the liquid level adjusting mechanism comprises a pumping pump mechanism, wherein a pumping pump in the pumping pump mechanism is respectively connected with the container and the liquid replenishing device through a conduit, and the first control instruction is used for adjusting the liquid level height of the photocuring material in the container by controlling the operation of the pumping pump. Wherein the pumping pump is a peristaltic pump, an impeller pump, a gear pump, a diaphragm pump, a screw pump or a piston pump. It should be noted that the above-mentioned balance weight mechanism and pumping pump mechanism are merely examples, and the present application is not limited thereto. The liquid level regulating mechanism can also be in other forms as long as the liquid level regulation of the photocuring material in the container can be realized.

Please refer to fig. 5, which is a flowchart illustrating a 3D printing method according to an embodiment of the present application. As shown, the illustrated 3D printing method includes steps S501-S504.

In step S501, a first level value of the photocurable material in the container is obtained before the 3D printing apparatus moves the member platform during the process of manufacturing the nth layer of the cross-section.

In another embodiment, the 3D printing device is provided with a doctor mechanism for smoothing the material to be cured on the printing reference surface for the next photocuring operation before curing a layer of the material to be cured. In this case, the process to manufacture the nth cross-sectional layer comprises: after the (n-1) th layer, for example, the ninth cured layer, is cured on the component platform, the component platform is driven by the Z-axis driving mechanism to descend for a predetermined distance, so that the photo-curing material to be cured is filled above the component platform again, the scraper mechanism performs a leveling operation on the photo-curing material to be cured, and then the energy radiation system irradiates again to obtain the tenth cured layer attached to the ninth cured layer.

The level of the photocurable material in the container may be detected by a level sensor to obtain a first level value of the photocurable material in the container.

The level sensor is an instrument for detecting the level of the photocurable material in the container. In one embodiment, the level sensor is a laser level sensor disposed above the vessel for detecting a level of photocurable material in the vessel. In particular, the laser level sensor detects the photocurable material in the region of the container edge that is not irradiated by the energy radiation system to obtain a more accurate level measurement. In another embodiment, the liquid level sensor may also be a liquid level measuring device, the liquid level measuring device includes a limiting member, a floating member and a distance measuring device, wherein the limiting member is used for communicating with the container so that the liquid level in the limiting member is the same as the liquid level in the container, and a guide portion is arranged inside the limiting member; the floating piece is limited in an area by the limiting piece and floats along with the liquid level under the action of the guide part; wherein the guide portion is used for preventing the floating piece from being adhered; the distance measuring device is arranged above the floating piece so as to obtain the liquid level by measuring the position of the floating piece.

It should be noted that the above liquid level sensor and the installation position thereof are only examples, and the present application is not limited thereto. The level sensor may also be other types of sensors and located elsewhere so long as it is capable of detecting the level of photocurable material in the container.

The first liquid level value refers to a liquid level value of a photocuring material in a container before a component platform moves in the process that the 3D printing equipment is used for manufacturing the nth cross-section layer. Based on this, in an embodiment, the liquid level sensor may detect a current liquid level value as the first liquid level value before the member platform moves during the 3D printing apparatus is to manufacture the nth cross-sectional layer. In order to improve the accuracy of the detected liquid level, in another embodiment, the liquid level sensor may further detect the liquid level value of the light-cured material in the container multiple times before the component platform moves during the process of manufacturing the nth layer of the cross-section by the 3D printing device, and process the obtained multiple liquid level values to obtain the first liquid level value, for example, average the obtained multiple liquid level values and use the average value as the first liquid level value, or screen the obtained multiple liquid level values, remove a value with a larger error, and average the screened liquid level value as the first liquid level value. In yet another embodiment, the liquid level sensor may further acquire a level value of the photocurable material in the container in real time, and obtain the first level value based on at least one level value acquired in real time. Specifically, the liquid level sensor acquires the liquid level value of the photocuring material in the container in real time during 3D printing, and when the 3D printing device is to manufacture the nth cross-sectional layer, all the liquid level values acquired in real time are screened to obtain one or more liquid level values before the component platform moves in the process of manufacturing the nth cross-sectional layer, in one example, one liquid level value is acquired, and the liquid level value is taken as the first liquid level value. In another example, a plurality of level values are obtained, the obtained plurality of level values are processed to obtain the first level value, for example, the obtained plurality of level values are averaged and the average value thereof is used as the first level value, or the obtained plurality of level values are filtered, a value with a larger error is removed, and the filtered level values are averaged and used as the first level value.

In step S502, the first liquid level value is detected based on a preset first liquid level reference condition to obtain a first detection result.

Wherein the first liquid level reference condition is preset for measuring the condition of the obtained first liquid level value of the light-cured material in the container so as to selectively perform subsequent liquid level adjusting operation. In an embodiment, the first liquid level reference condition includes a preset first liquid level reference parameter, and a determination criterion for measuring a deviation degree between the first liquid level value and the first liquid level reference parameter.

It should be noted that the above-mentioned characterization form of the first detection result is only an example, and the present application is not limited thereto. The first detection result may be in other forms, as long as a person skilled in the art can obtain different liquid level adjustment modes according to different first detection results.

In step S503, the component platform is controlled to move by a preset distance, and a first control instruction for adjusting the liquid level of the light-cured material in the container is selectively output according to a first detection result during the movement of the component platform, so as to control the liquid level adjusting mechanism to adjust the liquid level of the light-cured material in the container according to the first control instruction, where the first control instruction includes first adjustment amount information corresponding to a change in the liquid level.

The preset distance is preset according to the device parameters of the 3D printing and the model parameters of the 3D printing component. After the n-1 th layer is cured on the component platform, the component platform is driven by the Z-axis driving mechanism to descend and move for a preset distance, so that the light curing material to be cured is filled above the component platform again, and a subsequent energy radiation system irradiates again to obtain the attached n-th layer of the cross section.

The first regulating quantity information refers to information on the basis of which the liquid level regulating mechanism can operate to regulate the liquid level to a target liquid level, wherein the target liquid level refers to a liquid level value closer to a first liquid level reference parameter in a liquid level silence interval. For example, in the case where the liquid level adjustment mechanism includes a weight mechanism, the first adjustment amount information includes weight movement amount information. In a case where the liquid level adjustment mechanism includes a pumping pump mechanism, the first adjustment amount information includes pumping pump operating parameter information.

In one embodiment, the first adjustment amount information is determined based on the first detection result. For example, the fluid supply amount may be obtained from the first level value and the first level reference parameter included in the first detection result, and then converted into adjustment amount information that can characterize the operating parameter of the fluid level adjustment mechanism.

In another embodiment, the first adjustment amount information is a preset fixed value. The fixed value may be set based on the process parameters of the 3D printing apparatus according to the experience of a person skilled in the art, as long as the adjusted first level value can be brought closer to the first level reference parameter in the first level reference condition. In addition, the fixed value can be set according to the unit regulating quantity of the liquid level regulating mechanism and the parameters of the liquid level sensor. For example, a fixed value may be set depending on the resolution of the level sensor. In a specific example, the fixed value may be set at a value of 1/3 for the level sensor resolution. In another example, the fixed value may be set at a value of one time the resolution of the level sensor.

For convenience of description, the liquid level adjusting mechanism in the 3D printing apparatus is described as a balance weight mechanism, but the application is not limited thereto. In one embodiment, during the operation of the 3D printing device, the liquid level sensor acquires the liquid level value of the light-cured material in the container in real time, and when the 3D printing device is to manufacture the nth layer of the cross-section layer, all the liquid level values acquired in real time are screened to obtain a liquid level value before the component platform moves in the process of manufacturing the nth layer of the cross-section layer as the first liquid level value. Then, detecting the first liquid level value based on a preset first liquid level reference condition to obtain a first detection result, wherein, when it is detected that the deviation between the first level value and the first level reference parameter is not within the level silence interval, outputting a first detection result indicating that a deviation between the first level value and the first level reference is not within the level silence interval, and during movement of the control member platform, outputting a first control instruction including information of a fixed movement amount of the balance weight to a liquid level adjusting mechanism (balance weight mechanism) according to the detection result to control the balance weight mechanism to ascend or descend by the fixed movement amount, so that the counterbalance mechanism simultaneously adjusts the level of the photocurable material in the container during movement of the component platform, because 3D printing process does not need to be suspended to carry out liquid level adjustment, 3D printing efficiency is further improved. When detecting that the deviation between the first liquid level value and the first liquid level reference parameter is in the silence interval, outputting a first detection result representing that the deviation between the first liquid level value and the first liquid level reference parameter is in the silence interval, and during the movement of the control component platform, outputting a first control instruction comprising information that the movement amount of the balance weight is zero to the balance weight mechanism according to the detection result so as to control the balance weight mechanism not to move.

In step S504, the energy radiation system is controlled to cure the nth cross-sectional layer on the member platform.

After controlling the energy radiation system to cure the nth layer of cross-sectional layer on the member platform, steps S501-S504 are repeated to start the process of the 3D printing apparatus to manufacture the (n + 1) th layer of cross-sectional layer, and finally the 3D object with the accumulated pattern cured layer is formed on the member platform.

According to the 3D printing method, the liquid level is adjusted simultaneously during the movement of the component platform, 3D printing does not need to be suspended, and the printing efficiency is improved.

However, after the component platform moves for the preset distance, since the movement of the component platform also affects the liquid level change of the photocurable material in the container, the 3D printing method of the present application further includes liquid level adjustment after the component platform moves, so as to ensure that the liquid level of the photocurable material in the container is at the printing reference surface when the next layer is printed.

Referring to fig. 6, which is a schematic flowchart illustrating another embodiment of the 3D printing method of the present application, as shown in the figure, the 3D printing method includes steps S601-S607.

In step S601, a first level value of the photocurable material in the container is obtained before the 3D printing apparatus moves the member platform during the process of manufacturing the nth layer of the cross-section.

Step S601 is similar to step S501, and is not described herein again.

In step S602, the first liquid level value is detected based on a preset first liquid level reference condition to obtain a first detection result.

Step S602 is similar to step S502 described above, and is not described herein again.

In step S603, the component platform is controlled to move a preset distance, and a first control command for adjusting the liquid level of the photocurable material in the container is selectively output according to a first detection result during the movement of the component platform, so as to control the liquid level adjustment mechanism to adjust the liquid level of the photocurable material in the container according to the first control command, where the first control command includes first adjustment amount information corresponding to a change in the liquid level.

Step S603 is similar to step S503, and is not described herein again.

In step S604, after controlling the component platform to move the preset distance, a second level value of the light-cured material in the container is obtained.

Further, in a case where the 3D printing apparatus includes a blade mechanism, step S604 includes acquiring a second level value of the photocurable material in the container after controlling the member stage to move the preset distance and controlling the blade mechanism to perform a coating operation on the surface of the photocurable material in the container.

In step S605, the second level value is detected based on a preset second level reference condition to obtain a second detection result.

And the second liquid level reference parameter refers to a numerical value which the liquid level needs to reach when 3D printing is carried out. The second liquid level reference parameter is set according to the process parameters of the 3D printing equipment and is related to the printing reference surface. Specifically, the second liquid level reference parameter is the first liquid level reference parameter. The judgment standard for measuring the deviation degree between the second liquid level value and the second liquid level reference parameter can be represented by whether the deviation between the second liquid level value and the second liquid level reference parameter is within a preset interval or not. The preset interval can be called a liquid level setting interval, and a corresponding liquid level adjusting mode is determined according to whether the second liquid level value is in the liquid level setting interval or not. The liquid level setting interval can be set according to experience of a person skilled in the art based on process parameters of a 3D object to be printed by the 3D printing apparatus, for example, according to requirements of surface smoothness, dimensional accuracy and the like of the 3D object to be printed. Or may be set based on parameters of a level sensor for detecting the level of photocurable material in the container. In this case, the second detection result obtained by detecting the second level value of the photocurable material in the container based on the preset second level reference condition may take two forms, that is, the deviation between the second level value and the second level reference parameter is within the level setting range, and the deviation between the second level value and the second level reference parameter is not within the level setting range. Therefore, the second detection result can be represented in a 'yes/no' mode, and different liquid level adjusting modes are correspondingly arranged according to whether the deviation between the second liquid level value and the second liquid level reference parameter is within the liquid level setting interval or not. In addition, the second detection result may also be characterized in a form comprising a second level value, the second level reference condition.

In addition, the liquid level silent interval can be set according to the liquid level setting interval, so that the frequency of adjusting the liquid level according to the liquid level silent interval can be increased by setting the interval, and the frequency of adjusting the liquid level in the liquid level setting interval is reduced. In one example, the level silence interval is set to be in a range of one-quarter to one-half of the level set interval.

In step S606, a second control instruction for adjusting the liquid level of the light-cured material in the container is selectively output according to a second detection result, so as to control the liquid level adjusting mechanism to adjust the liquid level of the light-cured material in the container according to the second control instruction, where the second control instruction includes second adjustment amount information corresponding to the liquid level change.

The second regulation amount information is information that the liquid level regulation mechanism can operate based on the information to regulate the liquid level to a target liquid level, wherein the target liquid level is a liquid level value closer to a second liquid level reference parameter within a liquid level setting interval. For example, in the case where the liquid level adjustment mechanism includes a weight mechanism, the second adjustment amount information includes weight movement amount information. In the case where the liquid level adjustment mechanism includes a pumping pump mechanism, the second adjustment amount information includes pumping pump operating parameter information.

For convenience of description, the liquid level adjusting mechanism in the 3D printing apparatus is described as a balance weight mechanism, but the application is not limited thereto. In one embodiment, the adjustment of the liquid level during the 3D printing device to manufacture the nth cross-section layer is divided into two stages. Firstly, in a first stage, a liquid level value is acquired as a first liquid level value before a component platform moves in the process that the 3D printing equipment is to manufacture the nth layer of cross section. And then, detecting the first liquid level value based on a preset first liquid level reference condition to obtain a first detection result, wherein when the deviation between the first liquid level value and the first liquid level reference parameter is detected not to be in the liquid level silence interval, the first detection result representing that the deviation between the first liquid level value and the first liquid level reference parameter is not in the liquid level silence interval is output. Then, the control component platform moves for a preset distance, and during the movement of the control component platform, a first control instruction comprising information of the fixed movement amount of the balance weight is output to the liquid level adjusting mechanism (balance weight mechanism) according to the detection result so as to control the balance weight mechanism to ascend or descend for the fixed movement amount, so that the balance weight mechanism simultaneously adjusts the liquid level of the photocuring material in the container during the movement of the component platform. Then, in the second stage, after the control member platform moves for the preset distance, or after the control member platform moves for the preset distance and the scraper mechanism finishes the coating work, a liquid level value is acquired as a second liquid level value. And then, detecting the second liquid level value based on a preset second liquid level reference condition to obtain a second detection result, wherein when the deviation between the second liquid level value and the second liquid level reference parameter is detected to be within a liquid level setting interval, a second control instruction comprising information that the movement amount of the balance weight is zero is output to the balance weight mechanism, so that the balance weight mechanism does not move. Simultaneously, the energy radiation system is irradiated again to manufacture the n +1 th layer; or when the deviation between the second liquid level value and the second liquid level reference parameter is detected not to be in the liquid level setting interval, the required liquid supplementing amount is obtained through calculation according to the second liquid level value and the second liquid level reference parameter, then the required liquid supplementing amount is converted into adjustment amount information capable of representing the movement amount of the balance weight mechanism, and a second control instruction comprising the adjustment amount information is output to the balance weight mechanism, so that the balance weight mechanism moves based on the adjustment amount information to perform liquid level adjustment. After the conditioning is completed, the energy radiation system is irradiated again to manufacture the n +1 th layer.

Or, in a first phase, when detecting that the deviation between the first level value and the first level reference parameter is within the silence interval, outputting a first detection result representing that the deviation between the first level value and the first level reference parameter is within the silence interval. And then, controlling the component platform to move for a preset distance, and outputting a first control instruction comprising information that the movement amount of the balance weight is zero to the balance weight mechanism according to the detection result during the movement of the component platform so as to control the balance weight mechanism not to move. Then, in the second stage, after the control member platform moves for the preset distance, or after the control member platform moves for the preset distance and the scraper mechanism finishes the coating work, a liquid level value is acquired as a second liquid level value. And then, detecting the second liquid level value based on a preset second liquid level reference condition to obtain a second detection result, wherein when the deviation between the second liquid level value and the second liquid level reference parameter is detected to be within a liquid level setting interval, a second control instruction comprising information that the movement amount of the balance weight is zero is output to the balance weight mechanism, so that the balance weight mechanism does not move. At the same time, the energy radiation system irradiates again to manufacture the n +1 th layer; or when the deviation between the second liquid level value and the second liquid level reference parameter is detected not to be in the liquid level setting interval, the required liquid supplementing amount is obtained through calculation according to the second liquid level value and the second liquid level reference parameter, then the required liquid supplementing amount is converted into adjustment amount information capable of representing the movement amount of the balance weight mechanism, and a second control instruction comprising the adjustment amount information is output to the balance weight mechanism, so that the balance weight mechanism moves based on the adjustment amount information to perform liquid level adjustment. After the conditioning is completed, the energy radiation system is irradiated again to manufacture the n +1 th layer.

In step S607, the energy radiation system is controlled to cure the nth cross-sectional layer on the member platform.

After controlling the energy radiation system to cure the nth layer of cross-sectional layer on the member platform, steps S601-S607 are repeated to start the process of the 3D printing apparatus to manufacture the (n + 1) th layer of cross-sectional layer, and finally the 3D object accumulated by the pattern cured layer is formed on the member platform.

The 3D printing method divides the liquid level adjustment into two stages, and the liquid level adjustment is carried out simultaneously in the first stage during the movement of the component platform, so that the 3D printing is not required to be suspended, and the printing efficiency is improved. Detect the second liquid level value again and confirm whether to carry out liquid level control at the second stage, on the one hand can further ensure that the liquid level is in the printing reference surface when printing, improve and print the quality, on the other hand, although need pause 3D when the second stage is adjusted the liquid level and print, nevertheless because the joining of first stage makes all finely tune the liquid level of photocuring material in the container when printing every layer, make it more be close to liquid level reference parameter, thereby reduced the second liquid level value and be in the frequency outside the liquid level settlement interval, reduced the frequency that pause printing operation carried out liquid level control promptly, further improved printing efficiency.

The application also provides a 3D printing apparatus for adjust the liquid level of photocuring material in the container during 3D prints, in order to improve 3D printing efficiency.

For convenience of description, the 3D printing apparatus is exemplified as an SLA apparatus. Referring to fig. 7, which is a schematic structural diagram of the 3D printing apparatus according to an embodiment of the present disclosure, as shown, the 3D printing apparatus includes a container 11, a component platform 12, a Z-axis driving mechanism 13, an energy radiation system 14, a control device 15, a liquid level sensor 16, and a liquid level adjusting mechanism (not shown).

The container 11 is used for containing a light-curing material. The capacity of the container depends on the type of the 3D printing device, and in general, the container capacity in the SLA-based printing device is larger than the container capacity in the DLP-based printing device because the printing format (or radiating format) of the SLA-based 3D printing device is larger than that of the DLP-based 3D printing device.

In certain embodiments, the light-curable material includes any liquid or powder material susceptible to light curing, examples of which include: a photocurable resin liquid, or a resin liquid doped with a mixed material such as an additive, a pigment, or a dye. Powder materials include, but are not limited to: ceramic powder, color additive powder, etc. The materials of the container include but are not limited to: glass, plastic, resin, etc. Wherein the volume of the container depends on the type of the 3D printing device. In some implementations, the container is often referred to as a resin vat.

The member platform 12 is used to attach a pattern cured layer cured by irradiation so as to build up a 3D member via the pattern cured layer. Specifically, the component platform is exemplified by a component plate. The component platform typically takes a preset printing reference surface located in the container as a starting position, and each solidified layer solidified on the printing reference surface is accumulated layer by layer to obtain a corresponding 3D printing component.

The Z-axis driving mechanism 13 is connected to the component platform 12, and is used for controllably moving the component platform 12 in the vertical axial direction to adjust the distance between the component platform 12 and the printing reference surface and filling the photo-curing material to be cured. Wherein, the printing reference surface refers to the initial surface of the light-cured material irradiated. In order to accurately control the irradiation energy of each cured layer, the Z-axis driving mechanism needs to drive the component platform to move to a position where the minimum distance between the component platform and the printing reference surface is the layer thickness of the cured layer to be cured. In an embodiment where the 3D printing apparatus is an SLA apparatus with top surface laser scanning, the preset printing reference surface is generally located at a liquid level containing a resin liquid; in an embodiment where the 3D printing device is a bottom-exposed DLP device, the preset printing reference plane is typically located at the bottom of the container, or at a certain height from a preset position of the bottom, such as a DLP device using CLIP technology.

The energy radiation system 14 is used to irradiate the photocurable material in the container to obtain a patterned cured layer. Specifically, the energy radiation system illuminates the photocurable material within the container to yield the 3D component according to each layered image in print data generated based on a three-dimensional model of the pre-printed 3D component. In some implementation scenarios, the energy radiation system is also often referred to as an optical system.

The level sensor 16 is used to detect the level of photocurable material in the container. In this example, the level sensor is a laser level sensor disposed above the vessel for detecting the level of photocurable material in the vessel. In particular, the laser level sensor detects the photocurable material in the region of the container edge that is not irradiated by the energy radiation system to obtain a more accurate level measurement. In addition, the liquid level sensor can also be a liquid level measuring device, the liquid level measuring device comprises a limiting piece, a floating piece and a distance measuring device, wherein the limiting piece is communicated with the container so that the liquid level in the limiting piece is the same as the liquid level in the container, and a guide part is arranged on the inner side of the limiting piece; the floating piece is limited in an area by the limiting piece and floats along with the liquid level under the action of the guide part; wherein the guide part is used for preventing the floating piece from being stuck; the distance measuring device is arranged above the floating piece so as to obtain the liquid level by measuring the position of the floating piece.

The level adjustment mechanism (not shown) is used to adjust the level of the photocurable material in the container. In one embodiment, the liquid level adjusting mechanism comprises a balance weight mechanism, and the balance weight mechanism controls the height of the liquid level by lifting and lowering a balance weight. In a specific example, the balance weight mechanism comprises a balance weight arranged in the container and a lifting mechanism driving the balance weight to lift. In another embodiment, the liquid level adjusting mechanism comprises a pumping pump mechanism, wherein a pumping pump in the pumping pump mechanism is respectively connected with the container and the liquid replenishing device through a conduit, and the pumping pump mechanism is used for adjusting the liquid level height of the photocuring material in the container through the conduit by controlling the operation of the pumping pump. Wherein the pumping pump is a peristaltic pump, an impeller pump, a gear pump, a diaphragm pump, a screw pump or a piston pump.

The control device 15 is connected to the energy radiation system 14, the Z-axis driving mechanism 13, the liquid level sensor 16 and the liquid level adjusting mechanism, and is used for performing the 3D printing method to adhere and stack the pattern cured layer on the component platform 12 to obtain the corresponding three-dimensional object. The control device 25 is an electronic device including a processor, for example, the control device is a computer device, an embedded device, or an integrated circuit integrated with a CPU.

For example, the control device includes: the device comprises a processing unit, a storage unit and a plurality of interface units. Each interface unit is respectively connected with a device which is independently packaged in 3D printing equipment such as an energy radiation system, a Z-axis driving mechanism, a liquid level sensor and a liquid level adjusting mechanism and transmits data through interfaces. The control device further comprises at least one of: a prompting device, a human-computer interaction device and the like. The interface unit determines its interface type according to the connected device, which includes but is not limited to: universal serial interface, video interface, industrial control interface, etc.

For example, the interface unit includes: USB interface, HDMI interface and RS232 interface, wherein, USB interface and RS232 interface all have a plurality ofly, and the USB interface can connect man-machine interaction device etc. RS232 interface connection detection device and Z axle actuating mechanism, and the HDMI interface connection energy radiation system (optical system). The storage unit is used for storing files required by 3D printing equipment for printing. The file includes: the CPU runs the required program files and configuration files, etc.

The memory unit includes a non-volatile memory and a system bus. The nonvolatile memory is, for example, a solid state disk or a usb disk. The system bus is used to connect the non-volatile memory with the CPU, wherein the CPU may be integrated in the memory unit or packaged separately from the memory unit and connected with the non-volatile memory through the system bus.

The processing unit includes: a CPU or a chip integrated with a CPU, a programmable logic device (FPGA), and a multi-core processor. The processing unit also includes memory, registers, etc. for temporarily storing data.

The processing unit may be an industrial control unit that controls each device to execute in time sequence, for example, after the processing unit obtains a first level value of the light-cured material in a container before the component platform moves in a process of manufacturing an nth layer of cross section by the 3D printing apparatus, the processing unit controls the Z-axis driving mechanism to move the component platform to a distance position away from a preset printing reference surface and simultaneously controls the liquid level adjusting mechanism to perform liquid level adjustment, then transmits a layered image to the energy radiation system, and repeats the above process after the energy radiation system finishes irradiation to pattern and cure the light-cured material. Or after the processing unit obtains a first liquid level value of the photocuring material in the container before the component platform moves in the process of manufacturing the nth layer of the cross section by the 3D printing device, the Z-axis driving mechanism is controlled to move the component platform to a distance position away from a preset printing reference surface, the liquid level adjusting mechanism is controlled to perform liquid level adjustment, then after a second liquid level value of the photocuring material in the container after the component platform moves a preset distance in the process of manufacturing the nth layer of the cross section by the 3D printing device is obtained, the liquid level adjusting mechanism is controlled to perform liquid level adjustment operation, the layered image is transmitted to the energy radiation system, and after the energy radiation system finishes irradiation to pattern and cure the photocuring material, the process is repeated.

The utility model provides a 3D printing apparatus obtains the liquid level value of photocuring material in the container through level sensor to carry out liquid level control through liquid level control mechanism when the component platform removes, need not pause 3D and print, improved printing efficiency.

In order to be able to improve the printing quality, in an embodiment, the 3D printing apparatus is provided with a scraper mechanism for flattening the material to be cured on the printing reference surface before curing a layer of the material to be cured for the next photocuring operation. Referring to fig. 8, which is a schematic structural diagram of the 3D printing apparatus according to an embodiment of the present disclosure, as shown, the 3D printing apparatus includes a container 21, a component platform 22, a Z-axis driving mechanism 23, an energy radiation system 24, a control device 25, a liquid level sensor 26, a scraper mechanism 27, and a liquid level adjusting mechanism (not shown).

The container 21, the component platform 22, the Z-axis driving mechanism 23, the energy radiation system 24, the control device 25, the liquid level sensor 26, and the liquid level adjusting mechanism are similar to the container 11, the component platform 12, the Z-axis driving mechanism 13, the energy radiation system 14, the control device 15, the liquid level sensor 16, and the liquid level adjusting mechanism, and thus, the description thereof is omitted.

The scraper mechanism 27 is located above the component platform 22, and the control device 25 is further connected to the scraper mechanism 27 for controlling the scraper mechanism 27 to smooth the photo-curable material on a printing reference surface during a printing operation.

Specifically, the control device 25 is connected to the energy radiation system 24, the Z-axis driving mechanism 23, the liquid level sensor 26, the scraper mechanism 27 and the liquid level adjusting mechanism, and is configured to perform the 3D printing method to adhere and stack the pattern cured layer on the component platform 22 to obtain the corresponding three-dimensional object. The control device 25 is an electronic device including a processor, for example, the control device is a computer device, an embedded device, or an integrated circuit integrated with a CPU.

For example, the control device includes: the device comprises a processing unit, a storage unit and a plurality of interface units. Each interface unit is respectively connected with a device which is independently packaged in 3D printing equipment such as an energy radiation system, a Z-axis driving mechanism, a liquid level sensor, a liquid level adjusting mechanism, a scraper mechanism and the like and transmits data through interfaces. The control device further comprises at least one of the following: a prompting device, a human-computer interaction device and the like. The interface unit determines its interface type according to the connected device, which includes but is not limited to: universal serial interface, video interface, industrial control interface, etc.

The memory unit includes a non-volatile memory and a system bus. The nonvolatile memory is, for example, a solid state disk or a usb disk. The system bus is used to connect the non-volatile memory with the CPU, wherein the CPU may be integrated in the memory unit or packaged separately from the memory unit and connected to the non-volatile memory through the system bus.

The processing unit may be an industrial control unit that controls each device to execute in time sequence, for example, after the processing unit obtains a first level value of the light-cured material in a container before the component platform moves in a process of manufacturing an nth layer of cross section by the 3D printing apparatus, the processing unit controls the Z-axis driving mechanism to move the component platform to a distance position away from a preset printing reference surface and simultaneously controls the liquid level adjusting mechanism to perform liquid level adjustment, then transmits a layered image to the energy radiation system, and repeats the above process after the energy radiation system finishes irradiation to pattern and cure the light-cured material. Or after the processing unit obtains a first liquid level value of the photocuring material in the container before the component platform moves in the process of manufacturing the nth layer of the cross section by the 3D printing device, the Z-axis driving mechanism is controlled to move the component platform to a distance position away from a preset printing reference surface, the liquid level adjusting mechanism is controlled to perform liquid level adjustment, then after the component platform moves a preset distance in the process of manufacturing the nth layer of the cross section by the 3D printing device and the scraper mechanism finishes coating work, the liquid level adjusting mechanism is controlled to perform liquid level adjustment operation, a layered image is transmitted to the energy radiation system, and after the energy radiation system finishes irradiation to pattern and cure the photocuring material, the process is repeated.

It should be noted that, through the above description of the embodiments, those skilled in the art can clearly understand that part or all of the present application can be implemented by software and combined with necessary general hardware platform. Based on this understanding, the present application also provides a storage medium of a computer device, the storage medium storing at least one program which, when executed by a processor, performs any of the aforementioned liquid level adjustment methods, or which, when executed by a processor, performs any of the aforementioned 3D printing methods.

With this understanding in mind, the technical solutions of the present application and/or portions thereof that contribute to the prior art may be embodied in the form of a software product that may include one or more machine-readable media having stored thereon machine-executable instructions that, when executed by one or more machines such as a computer, network of computers, or other electronic devices, may cause the one or more machines to perform operations in accordance with embodiments of the present application. The machine-readable medium may include, but is not limited to, floppy diskettes, optical disks, CD-ROMs (compact disc-read only memories), magneto-optical disks, ROMs (read only memories), RAMs (random access memories), EPROMs (erasable programmable read only memories), EEPROMs (electrically erasable programmable read only memories), magnetic or optical cards, flash memory, or other type of media/machine-readable medium suitable for storing machine-executable instructions. For example, the aforementioned print program stored in the control device and the data processing program stored in the data processing apparatus are each saved in a storage server provided in a service mall via a storage medium. The service mall is exemplified as follows: APP shopping malls, software downloading websites, and the like. The storage server may be a single server, a distributed service cluster, a server based on a cloud architecture, etc.

The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.

The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A liquid level adjusting method is applied to a 3D printing device, and is characterized in that the 3D printing device comprises a component platform and a container for containing a light curing material, and the liquid level adjusting method comprises the following steps:

before the 3D printing equipment moves a component platform in the process of manufacturing an nth cross-section layer, detecting a first liquid level value of a photocuring material in the container based on a preset first liquid level reference condition to obtain a first detection result; wherein n > 0;

selectively outputting a first control instruction for adjusting the liquid level of the photocuring material in the container according to the first detection result during the movement of the component platform, wherein the first control instruction comprises first adjustment amount information corresponding to the liquid level change, and the first adjustment amount information is that a liquid level adjusting mechanism can be operated based on the information to adjust the liquid level to be close to a liquid level value corresponding to a first liquid level reference parameter;

after the component platform moves for a preset distance in the process that the 3D printing equipment is used for manufacturing the nth cross-section layer, detecting a second liquid level value of the photocuring material in the container based on a preset second liquid level reference condition to obtain a second detection result;

and selectively outputting a second control instruction for adjusting the liquid level of the photocuring material in the container according to the second detection result, wherein the second control instruction comprises second adjustment amount information corresponding to the liquid level change, and the second adjustment amount information is that the liquid level adjusting mechanism can be operated based on the information to adjust the liquid level to be close to the liquid level value corresponding to the second liquid level reference parameter.

2. The method of claim 1, wherein the step of detecting a first level value of the photocurable material in the container based on a preset first level reference condition to obtain a first detection result comprises:

and acquiring the level value of the photocuring material in the container in real time, and obtaining the first level value based on at least one level value acquired in real time.

3. The liquid level adjustment method according to claim 1, characterized in that the first adjustment amount information is determined based on the first detection result, or the first adjustment amount information is a preset fixed value.

4. The liquid level adjustment method according to claim 1, wherein the first control instruction is output to a liquid level adjustment mechanism of the 3D printing apparatus.

5. The liquid level adjusting method according to claim 1, wherein the 3D printing device further comprises a scraper mechanism, and the step of detecting a second liquid level value of the light-cured material in the container based on a preset second liquid level reference condition after the component platform moves a preset distance in the process that the 3D printing device is to manufacture the nth cross-section layer to obtain a second detection result comprises: and after the component platform moves a preset distance and the scraper mechanism finishes coating work in the process that the 3D printing equipment is used for manufacturing the nth cross-section layer, detecting a second liquid level value of the photocuring material in the container based on a preset second liquid level reference condition to obtain a second detection result.

6. The liquid level adjusting method as claimed in claim 1 or 5, wherein the step of detecting a second liquid level value of the light-curing material in the container based on a preset second liquid level reference condition to obtain a second detection result comprises:

and acquiring the level value of the photocuring material in the container in real time, and obtaining the second level value based on at least one level value acquired in real time.

7. The liquid level adjustment method according to claim 1, characterized in that the second adjustment amount information is determined based on the second detection result, or the second adjustment amount information is a preset fixed value.

8. The liquid level adjustment method according to claim 1, wherein the second control instruction is output to a liquid level adjustment mechanism of the 3D printing apparatus.

9. The utility model provides a liquid level control system, is applied to 3D printing apparatus, its characterized in that, liquid level control system includes:

a storage unit for storing at least one program; and

a processing unit connected to the memory unit for reading the at least one program to perform the method of level adjustment according to any one of claims 1-8.

10. A3D printing method is applied to a 3D printing device, the 3D printing device comprises an energy radiation system, a component platform, a container for containing a light-curing material and a liquid level adjusting mechanism for adjusting the liquid level of the light-curing material in the container, and the 3D printing method comprises the following steps:

acquiring a first level value of a photocuring material in the container before a component platform of the 3D printing equipment moves in the process of manufacturing the nth layer of cross section;

detecting the first liquid level value based on a preset first liquid level reference condition to obtain a first detection result;

controlling the component platform to move for a preset distance, and selectively outputting a first control instruction for adjusting the liquid level of the photocuring material in the container according to the first detection result during the movement of the component platform so as to control the liquid level adjusting mechanism to adjust the liquid level of the photocuring material in the container according to the first control instruction, wherein the first control instruction comprises first adjustment amount information corresponding to liquid level change, and the first adjustment amount information is that the liquid level adjusting mechanism can operate based on the information to adjust the liquid level to be close to a liquid level value corresponding to a first liquid level reference parameter;

after the component platform is controlled to move the preset distance, a second liquid level value of the photocuring material in the container is obtained;

detecting the second liquid level value based on a preset second liquid level reference condition to obtain a second detection result;

selectively outputting a second control instruction for adjusting the liquid level of the photocuring material in the container according to the second detection result so as to control the liquid level adjusting mechanism to adjust the liquid level of the photocuring material in the container according to the second control instruction, wherein the second control instruction comprises second adjustment quantity information corresponding to liquid level change, and the second adjustment quantity information is that the liquid level adjusting mechanism can operate based on the information so as to adjust the liquid level to be close to a liquid level value corresponding to a second liquid level reference parameter;

and

controlling the energy radiation system to cure the nth cross-sectional layer on the component platform.

11. The 3D printing method according to claim 10, wherein the step of obtaining a first level value of the photocurable material in the container comprises: and acquiring the level value of the photocuring material in the container in real time, and obtaining the first level value based on at least one level value acquired in real time.

12. The 3D printing method according to claim 10, wherein the first adjustment amount information is determined based on the first detection result or the first adjustment amount information is a preset fixed value.

13. The 3D printing method according to claim 10, wherein the 3D printing device further comprises a doctor blade mechanism, and the step of obtaining a second level value of the photocurable material in the container after controlling the component platform to move the preset distance comprises: and controlling the component platform to move the preset distance and controlling the scraper mechanism to perform coating operation on the surface of the photocuring material in the container, and then acquiring a second liquid level value of the photocuring material in the container.

14. The 3D printing method according to claim 10, wherein the step of obtaining a second level value of the photocurable material in the container comprises: and acquiring the level value of the photocuring material in the container in real time, and obtaining the second level value based on at least one level value acquired in real time.

15. The 3D printing method according to claim 10, wherein the second adjustment amount information is determined based on the second detection result, or the second adjustment amount information is a preset fixed value.

16. A3D printing apparatus, comprising:

a container for holding a photocurable material;

an energy radiation system for irradiating the photo-curable material in the container to obtain a pattern cured layer;

a member stage for attaching the irradiation-cured pattern cured layer;

the Z-axis driving mechanism is connected with the component platform and is used for controllably moving along the vertical axial direction to adjust the distance between the component platform and the printing reference surface and filling the photocuring material to be cured;

a level sensor for detecting a level of photocurable material in the container;

the liquid level adjusting mechanism is used for adjusting the liquid level of the photocuring material in the container; and

a control device connected to the energy radiation system, the Z-axis driving mechanism, the liquid level sensor, and the liquid level adjusting mechanism, for attaching the stacked patterned cured layer on the member platform to obtain the corresponding three-dimensional object by performing the 3D printing method according to any one of claims 10 to 12 and 14 to 15.

17. The 3D printing device according to claim 16, wherein the 3D printing device further comprises a doctor blade mechanism, and the control means is configured to adjust the level of light curable material in the container by performing the 3D printing method according to claim 13.

18. The 3D printing apparatus of claim 16, wherein the fluid level adjustment mechanism comprises a counterbalance mechanism or a pumping pump mechanism.

19. The 3D printing apparatus of claim 18, wherein the pumping pump mechanism comprises a pumping pump that is a peristaltic pump, a vane pump, a gear pump, a diaphragm pump, a screw pump, or a piston pump.

20. A storage medium of a computer device, characterized in that at least one program is stored which, when being executed by a processor, performs a method of level adjustment according to any one of claims 1-8; alternatively, the program when executed by a processor performs the 3D printing method as claimed in any one of claims 10 to 15.