Pulsing release module, pulsing release resin tank, and 3D printing device and printing method

Abstract

The present disclosure relates to a pulsing release module, a pulsing release resin tank, and a 3D printing device and printing method. The pulsing release module comprises a resin tank assembly, a support assembly and a pulse gas supply assembly, wherein the resin tank assembly is provided with a release film; the support assembly is arranged below the resin tank assembly, the support assembly is provided with a support member, and a first preset distance is provided between the support member and the release film in a height direction and is configured to form a gas cavity between the support member and the release film; a gas inlet and a gas outlet, which are in communication with the gas cavity, are provided in the support member; and the pulse gas supply assembly comprises a gas oscillation assembly and a gas conveying line, the gas oscillation assembly being arranged on the gas conveying line, and the gas conveying line being connected to the gas inlet.

Description

Pulse stripping module, pulse stripping tray, 3D printing equipment and printing method

[0001] Related applications

[0002] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311643769.0 and invention name “Pulse peeling module, pulse peeling tray, 3D printing equipment and printing method”, the entire contents of which are incorporated by reference in this disclosure. Technical Field

[0003] The present disclosure relates to the field of 3D printing technology, and in particular to a pulse stripping module, a pulse stripping tray, a 3D printing device, and a printing method. Background Art

[0004] Stereolithography 3D printing technology (such as DLP technology and LCD technology) uses a light source to illuminate liquid photosensitive resin to solidify it and form it on a forming platform, thereby solidifying and forming the photosensitive material layer by layer to form a three-dimensional object. When stereolithography 3D printing uses a bottom-up forming method, each layer of the model is cured between the rigid surface of the material tray and the forming platform. After curing, since the printed model is bonded to the rigid surface of the material tray, the two need to be peeled off before the next layer of the model can be printed. During the peeling process, there will be a large peeling force and a large noise. When printing with specific materials (such as elastic materials) or printing specific models (such as models with cantilevered arms), if the peeling force is large, there may be risks of printing the board off, printing warping, etc., which will cause printing failure and may even cause damage to the printing equipment.

[0005] To reduce the peeling force during peeling of the printed model, a flexible release film is used in the prior art to replace the rigid surface of the material tray. Due to the ductility of the release film, the peeling between the cured printed model and the material tray can be converted from surface separation to linear separation, which can reduce the peeling force to a certain extent. When the build platform drives the printed model to separate from the flexible release film, the angle between the flexible release film and the bottom surface of the printed model must reach the critical peeling angle θ to achieve separation. As shown in Figure 4, due to the ductility of the flexible release film, it will undergo a certain degree of elastic deformation under the tensile force of the printed model, which will increase the peeling stroke and reduce the peeling efficiency. In addition, a rigid support member is usually provided under the flexible release film to maintain a certain rigidity of the material tray. When the build platform drives the printed model downward, the lower surface of the flexible release film and the upper surface of the rigid support member will adhere to each other. During peeling, the flexible release film must be separated from the rigid support member first, and then from the printed model. Due to the strong vacuum adsorption force of the rigid support member on the flexible release film, the peeling force will also increase, making the conversion from surface separation to linear separation less effective.

[0006] Summary of the Invention

[0007] The present disclosure provides a pulse peeling module, a pulse peeling tray, a 3D printing device and a printing method to solve the technical problems in the prior art of large peeling force and long peeling stroke when peeling a 3D printed model.

[0008] In a first aspect, the present disclosure provides a pulse stripping module, comprising:

[0009] A tray assembly, the tray assembly having a release film;

[0010] A support assembly is provided below the tray assembly and includes a support member. The support member and the release film have a first preset distance in height, so as to form a gas chamber between the support member and the release film. The support member is provided with an air inlet and an air outlet, each of which is in communication with the gas chamber.

[0011] The pulse gas providing component includes a gas oscillation component and a gas transmission pipeline. The gas oscillation component is arranged on the gas transmission pipeline, and the gas transmission pipeline is connected to the gas inlet.

[0012] Optionally, a sealing member is provided along the circumference of the support member, and the sealing member is used to connect with the tray assembly.

[0013] Optionally, the sealing member is provided with a flow port communicating with the gas chamber.

[0014] Optionally, an auxiliary member is provided on the side of the support member facing the release film, so that when the release film and the support member are attached to each other and have a tendency to move away from the support member, a peeling angle is formed between the release film and the support member.

[0015] Optionally, the number of the auxiliary members is at least two, and they are dispersedly arranged along the circumference of the support member to form a highly consistent gas chamber between the support member and the release film.

[0016] Optionally, the number of auxiliary parts is four, and they are respectively arranged corresponding to the four corners of the support member; and / or the number of auxiliary parts is four, and they are respectively arranged corresponding to the four edges of the support member.

[0017] Optionally, the auxiliary component is any one or more combinations of tape, plastic plate, metal gasket, foam, wooden sheet, and fiber cloth.

[0018] Optionally, the pulse gas supply assembly further includes a control valve to control the gas to enter the gas chamber according to preset requirements.

[0019] Optionally, the support member is a transparent rigid support member or a transparent flexible support member.

[0020] Optionally, when the supporting component is a transparent flexible supporting member, it further includes a rigid substrate arranged below the transparent flexible supporting member.

[0021] Optionally, the support member is one or more combinations of fluoropolymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, heat-sensitive resin, glass, and screen.

[0022] In a second aspect, the present disclosure provides a pulse stripping tray, comprising a release film and a support member, wherein the support member and the release film are spaced a second predetermined distance apart in a height direction to form a gas chamber between the support member and the release film; and the support member is provided with an air inlet and an air outlet, each of the air inlet and the air outlet being in communication with the gas chamber.

[0023] The gas inlet and gas outlet are used to connect with the pulse gas supply assembly.

[0024] Optionally, the support member is a transparent flexible support member.

[0025] Optionally, the transparent flexible support member is one or more combinations of fluoropolymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and heat-sensitive resin.

[0026] Optionally, the support assembly further includes a rigid substrate disposed below the transparent flexible support member.

[0027] Optionally, an auxiliary member is provided on the side of the support member facing the release film, so that when the release film and the support member are attached to each other and have a tendency to move away from the support member, a peeling angle is formed between the release film and the support member.

[0028] Optionally, the number of the auxiliary members is at least two, and they are dispersedly arranged along the circumference of the support member to form a highly consistent gas chamber between the support member and the release film.

[0029] Optionally, the number of auxiliary parts is four, and they are respectively arranged corresponding to the four corners of the support member; and / or the number of auxiliary parts is four, and they are respectively arranged corresponding to the four edges of the support member.

[0030] Optionally, the auxiliary component is any one or more combinations of tape, plastic plate, metal gasket, foam, wooden sheet, and fiber cloth.

[0031] Optionally, a position sensor is provided on the material tray body, and the position sensor is used to detect position data of the release film.

[0032] In a third aspect, the present disclosure provides a 3D printing device, comprising the pulse stripping module provided in the first aspect of the present disclosure or the pulse stripping tray provided in the second aspect of the present disclosure, and also comprising a molding platform, an optical machine and a control system, wherein the molding platform is arranged above the tray assembly, the optical machine is arranged below the support assembly, and the control system is respectively associated with the molding platform, the optical machine and the pulse gas providing assembly.

[0033] Optionally, the control system communicates with the pulse gas providing component to generate a control instruction according to a pre-configured control strategy and send the control instruction to the pulse gas providing component.

[0034] Optionally, the control strategy is configured to generate and send a first control instruction when it is detected that the release film of the 3D printing device is higher than a preset calibration position, the gas pressure in the 3D printing device is higher than a preset pressure range, the gas flow in the 3D printing device is higher than a preset range, the concentration of the gas in the 3D printing device is higher than a preset concentration range, or the bearing force of the lower surface of the release film of the 3D printing device is greater than the bearing force of the upper surface; wherein the first control instruction includes controlling the gas delivered by the pulse gas supply component to reduce;

[0035] When it is detected that the release film of the 3D printing device is lower than a preset calibration position, the gas pressure in the 3D printing device is lower than a preset pressure range, the gas flow in the 3D printing device is lower than a preset range, the concentration of the gas in the 3D printing device is lower than a preset concentration range, and the upper surface bearing force of the release film of the 3D printing device is less than the lower surface bearing force, a second control instruction is generated and sent; wherein the second control instruction includes controlling the increase of gas delivered by the pulse gas supply component.

[0036] Optionally, the building platform has an avoidance design for avoiding auxiliary parts.

[0037] Optionally, the avoidance design is at least one of an avoidance cut corner and an avoidance groove.

[0038] In a fourth aspect, the present disclosure provides a 3D printing method, which uses the 3D printing device provided in the third aspect of the present disclosure, comprising the following steps:

[0039] Obtain a collection of slice images corresponding to the 3D model to be printed, and calculate the printing difficulty value corresponding to each slice image;

[0040] Based on the printing difficulty value, determine the printing parameters and pulse airflow parameters corresponding to each slice image;

[0041] The model printing operation corresponding to each layer of the slice image is determined based on the printing parameters, and the model peeling operation corresponding to each layer of the slice image is determined based on the pulse airflow parameters.

[0042] Optionally, the pulse airflow parameter includes a pulse frequency, and the pulse frequency is directly proportional to the printing difficulty value.

[0043] Optionally, the mold peeling operation includes: during the mold peeling, introducing a pulsed air flow into the air inlet at a pulse frequency, so that the volume of the gas chamber changes periodically, and the release film oscillates periodically.

[0044] The present disclosure also provides a three-dimensional printing system, which includes: a material tray assembly, which has a release film; a support assembly, which has a support member, wherein a gas chamber is formed between the support member and the release film, and the gas chamber is connected to an air inlet and an air outlet; a gas supply assembly, which is configured to transport gas to the gas chamber and is configured to cause periodic changes in the volume of the gas chamber.

[0045] In certain embodiments, the gas supply assembly is configured to intermittently deliver gas to the gas chamber.

[0046] In some embodiments, the gas supply assembly delivers gas to the gas chamber at different flow rates, and the gas in the gas chamber is discharged through the gas outlet at the same flow rate.

[0047] The above technical solution provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0048] In the pulsed peeling module provided by the disclosed embodiments, when the printed workpiece is peeled from the release film, a pulsed gas supply assembly delivers a pulsed gas flow into the gas chamber through the air inlet, causing the gas volume within the gas chamber to fluctuate periodically, resulting in periodic oscillations in the release film. This allows the release film to vibrate in a wave-like manner during the peeling process, quickly breaking the vacuum between the release film and the support member. It also allows the critical peel angle between the bottom surface of the printed workpiece and the release film to be reached within a relatively short peeling stroke, thus reducing the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of board drop.

[0049] The pulse stripping material tray provided by the embodiment of the present disclosure has a second preset distance in the height direction through the support member release film to form a gas chamber, and an air inlet and an air outlet connected to the gas chamber are respectively provided on the support member. The pulse gas providing component inputs a pulse airflow into the gas chamber through the air inlet to cause the gas volume in the gas chamber to change periodically, so that the release film produces periodic oscillations, so that when the printed part is peeled off from the release film, the release film shakes in a wave-like manner during the peeling process, which can quickly break the vacuum adsorption state between the release film and the support member, and also can make the bottom surface of the printed part and the release film reach the critical value of the peeling angle within a shorter peeling stroke, which is beneficial to reduce the peeling force and peeling stroke, improve printing efficiency and printing success rate, and reduce the risk of board falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0051] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0053] FIG1 is a schematic structural diagram of a pulse stripping module provided in an embodiment of the present disclosure;

[0054] FIG2 is a schematic diagram showing the connection between the tray assembly and the support assembly provided in an embodiment of the present disclosure;

[0055] FIG3 is a schematic diagram showing the connection between a printed part and a pulse stripping module according to an embodiment of the present disclosure;

[0056] FIG4 is a schematic diagram of peeling off a release film in the prior art;

[0057] FIG5 is a schematic diagram of the stripping of a pulse stripping module provided in an embodiment of the present disclosure;

[0058] FIG6 is a top view of a pulse stripping tray provided in an embodiment of the present disclosure;

[0059] FIG7 is a cross-sectional view along AA in FIG6 provided in an embodiment of the present disclosure;

[0060] FIG8 is a cross-sectional view of a pulse stripping tray provided in an embodiment of the present disclosure;

[0061] FIG9 is a schematic diagram of the partial structure of the support assembly, pulse stripping tray and forming platform provided in an embodiment of the present disclosure;

[0062] FIG10 is a top view of a support assembly, a pulse stripping tray, and a forming platform provided in an embodiment of the present disclosure;

[0063] FIG11 is a partial structural diagram of a support assembly, a pulse stripping tray, and a forming platform provided in an embodiment of the present disclosure;

[0064] FIG12 is a partial structural diagram of a support assembly, a pulse stripping tray, and a forming platform provided in an embodiment of the present disclosure;

[0065] FIG13 is a schematic diagram of the partial structure of the support assembly, pulse stripping tray and forming platform provided in an embodiment of the present disclosure;

[0066] FIG14 is a top view of a support assembly, a pulse stripping tray, and a forming platform provided in an embodiment of the present disclosure;

[0067] FIG15 is a partial structural diagram of the support assembly, pulse stripping tray and forming platform provided in an embodiment of the present disclosure.

[0068] FIG16 is a schematic structural diagram of a 3D printing device provided in an embodiment of the present disclosure;

[0069] FIG17 is a control schematic diagram of a 3D printing device provided by an embodiment of the present disclosure;

[0070] FIG18 is a flowchart of a 3D printing method provided in an embodiment of the present disclosure.

[0071] It should be noted that, in FIG2 , FIG3 and FIG16 , the dotted line represents the initial position of the release film; and the dotted line in FIG16 represents the irradiation range of the light machine.

[0072] Description of reference numerals:

[0073] d. Peeling stroke;

[0074] 1. Tray assembly; 11. Release film; 12. Tray body; 13. Position sensor;

[0075] 2. Support assembly; 21. Support member; 21a. Transparent rigid support member; 21b. Transparent flexible support member; 211. Air inlet; 212. Air outlet; 22. Sealing member; 22a. First sealing member; 22b. Second sealing member; 221. Flow port; 23. Rigid substrate; 24. Connector;

[0076] 3. Pulse gas supply assembly; 31. Gas oscillation assembly; 32. Gas transmission pipeline; 33. Gas source; 34. Control valve;

[0077] 4. Molding platform; 5. Optical machine; 6. Control system; 7. Printed parts;

[0078] 81. Base; 82. Molding surface; 83. Avoidance design; 84. Auxiliary parts;

[0079] 100. Gas chamber. DETAILED DESCRIPTION

[0080] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0081] The disclosure below provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0082] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0083] 16 , the present disclosure provides a 3D printing device. In one embodiment, the 3D printing device may include a forming platform 4 , a tray assembly 1 , and a support assembly 2 .

[0084] The tray assembly 1 can be used to hold printing materials, and the forming platform 4 can be disposed on the side of the tray assembly 1 that holds the printing materials. In this embodiment, the forming platform 4 can have a forming surface 82. During the printing process, the printed part can be solidified layer by layer on the forming surface 82 to form the printed material into the desired printed part.

[0085] It should be noted that the 3D printing technologies applicable in the present disclosure may include DLP, LCD, Micro-LED, Mini-LED and other light-curing 3D printing, as well as other surface exposure 3D printing technologies, which are not limited here.

[0086] When using a stretch film tray in a 3D printing device, the build platform is pressed downward during the printing process, facilitating contact between the bottom of the printed part and the liquid photosensitive material. This generates a drainage force on the upper surface of the flexible release film, while the rigid support beneath it generates an electrostatic force on its lower surface. Under the dual action of the drainage and electrostatic forces, the flexible release film elastically deforms and moves downward toward the rigid support until it adheres, creating a vacuum between a portion of the release film and the rigid support. After the bottom printed model solidifies, the flexible release film must first be peeled off from the rigid support. This surface peeling process increases the peeling force and can lead to a sudden change in the peeling force value during the peeling process, resulting in printing failure or an abnormal release surface on that layer. After the surface peeling between the flexible release film and the rigid support is completed, the build platform drives the printed part further upward. Linear peeling can only be achieved when the peeling angle between the bottom surface of the printed part and the flexible release film reaches a critical value, θ. Due to the certain ductility of the flexible release film, the peeling distance d is relatively long, as shown in Figure 4.

[0087] In response to the challenges of large peeling force and long peeling stroke when peeling 3D printed models, the present disclosure provides a pulse peeling module, 3D printing equipment and printing method, which can form a gas chamber 100 through a release film 11 and a support member 21, and fill the gas chamber with a pulse airflow through the gas oscillation component 31 of the pulse gas providing component to achieve a change in the gas volume in the gas chamber 100, so that the release film 11 can oscillate periodically, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, avoid the surface peeling between the release film 11 and the support member 21 from affecting the peeling force, and significantly reduce the peeling force; the release film 11 can reach the critical value of the peeling angle faster during the oscillation process, which can reduce the peeling stroke, thereby improving printing efficiency and printing success rate, and reducing the risk of board falling.

[0088] 1 to 18 , the embodiment of the present disclosure provides a pulse stripping module, including a tray assembly 1, a support assembly 2 and a pulse gas providing assembly 3. The tray assembly 1 has a release film 11, which can be used to form a material trough for holding liquid photosensitive material (such as photosensitive resin) in combination with a tray body 12; the support assembly 2 is connected to the bottom of the tray assembly 1, and the support assembly 2 has a support member 21, which can be used to support the release film 11 during the downward pressing process of the molding platform 4. The support member 21 and the release film 11 have a first preset distance in the height direction, so as to form a gas chamber 100 between the support member 21 and the release film 11. The first preset distance is the thickness of the gas chamber, so as to avoid the lower surface of the release film 11 and the upper surface of the support member 21 from fitting together in the initial state, as shown in FIG1 ; the support member 21 is respectively provided with an air inlet 211 and an air outlet 212 connected to the gas chamber 100 2, which is convenient for airflow into and out of the gas chamber 100; the pulse gas providing component 3 includes a gas oscillation component 31 and a gas supply pipeline 32. The gas oscillation component 31 is arranged on the gas supply pipeline 32, and is used to convert the airflow in the gas supply pipeline 32 into a pulse airflow. When the printed part 7 is peeled off from the release film 11, the pulse gas providing component 3 inputs a pulse airflow into the gas chamber 100 through the air inlet 211, which can cause the gas volume in the gas chamber 100 to change periodically, and cause the release film 11 to oscillate periodically, so that the release film 11 shakes in a wave-like manner during the peeling process, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, and at the same time, it can also make the bottom surface of the printed part 7 and the release film 11 reach the critical value of the peeling angle θ within a shorter peeling stroke d, as shown in Figure 5, which is conducive to reducing the peeling force and peeling stroke, improving printing efficiency and printing success rate, and reducing the risk of board falling.

[0089] It should be noted that the release film 11 can be connected to the tray body 12 using a conventional film stretching mechanism. This allows the release film 11 to initially be horizontal, facilitating control of the thickness of each layer of the printed part 7 and preventing uneven thickness. Because the release film 11 is elastic, changes in air pressure at the air inlet 211 can cause slight changes in the volume of the air cavity, as shown in Figure 2. The magnitude of this change is reflected by the change in air pressure at the air outlet 212.

[0090] It should be noted that the first preset distance can be set as needed. In some embodiments of the present disclosure, the first preset distance is 0.01mm-10mm, such as 0.01mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or a value between any two point values. This is because during exposure and curing, the support member 21 is required to fit and support the bottom of the release film 11 in order to provide a stable molding surface for molding; if the thickness of the gas chamber 100 is too large, when printing a model with a smaller cross-section, it is difficult for the bottom of the print 7 to provide sufficient drainage force to the release film 11 so that it fits on the support member 21, which will cause the molding surface to be unstable, thereby causing uneven printing thickness between layers when the cross-sections between different layers of the print 7 change. In the present disclosure, when the release film 11 is vibrated by the pulsed airflow, the vacuum created by the contact between the release film 11 and the underlying support member 21 can be quickly broken during the peeling process after exposure and curing, allowing the entire gas chamber 100 to quickly return to its initial gas cavity state. The peeling force after breaking the vacuum is the same as that of the unattached gas cavity state, eliminating the need to increase the thickness of the gas chamber 100 to achieve this effect. When the first preset distance is 0.01mm-10mm, the gas chamber thickness is relatively thin, facilitating the support member 21 to adhere to and support the bottom of the release film 11 during molding, providing a stable molding surface for molding. This improves the molding accuracy of each cured layer and the consistency of the cured area, while also reducing the risk of zeroing anomalies in the first layer of photocuring printing.

[0091] It should be noted that the gas oscillator assembly 31 can be a conventional gas oscillator. The pulse gas supply assembly 3 also includes a gas source 33 connected to the gas oscillator assembly 31 for providing an initial gas flow. Gas source 33 can be nitrogen, oxygen, air, or an inert gas. A pressure detector and valve assembly can be provided on the gas pipeline 32 to facilitate detection of the pulsed gas flow in the gas pipeline 32.

[0092] In some embodiments, the pulse gas supply assembly 3 includes a control valve 34 to control the gas to enter the gas chamber 100 according to preset requirements. Specifically, the gas supply can be controlled continuously or intermittently based on the demand of the printed workpiece 7, or a continuous supply period and an intermittent supply period can be used. This is not limited here, and those skilled in the art can set it according to experimental requirements, process strategies, etc.

[0093] To ensure that airflow enters and exits the gas chamber only through the air inlet 211 and the air outlet 212, in some embodiments of the present disclosure, a seal 22 is provided along the circumference of the support member 21. The seal 22 is used to connect to the tray assembly 1 to ensure a seal between the support member and the tray assembly. Specifically, the seal 22 can be connected between the tray body 12 and the support member 21, as shown by the first seal 22a in Figure 2; the seal 22 can also be directly connected between the release film 11 and the support member 21, as shown by the second seal 22b in Figure 7. The seal 22 is also an auxiliary component 84, which is provided between the release film 11 and the support member 21, as shown by the auxiliary component 84 in Figure 8.

[0094] When the seal 22 is directly connected between the release film 11 and the support member 21, if the air inlet 211 and the air outlet 212 are located on the periphery of the seal 22, the pulsed airflow will be unable to enter the gas chamber 100 formed by the release film 11, the seal 22 and the support member 21. Therefore, in some embodiments of the present disclosure, a flow port 221 connected to the gas chamber is provided on the seal 22, as shown in Figure 6.

[0095] It should be noted that the air outlet 212 can be provided on the support member 21 or in a non-sealed area of ​​the sealing member 22 .

[0096] Since the support member 21 needs to provide a stable molding surface for the release film 11 when it is in contact with the release film 11, in some embodiments of the present disclosure, the support member 21 is a transparent rigid support member 21a, as shown in Figures 1 to 3. When the molding platform 4 and the printed part 7 are pressed down on the release film 11, the upper surface of the transparent rigid support member 21a is in contact with the bottom of the release film 11. The support member provides support and can provide a stable molding surface for exposure and curing.

[0097] In some embodiments, as shown in Figures 7-15, in order to ensure that the support surface of the support member 21 facing the release film 11 is lower than the release film 11, thereby better ensuring that the height (thickness) of the gas chamber 100 is controllable, the support assembly 2 may include a support member 21 and an auxiliary member 84. The support member 21 may be disposed on one side of the tray assembly 1, specifically on the side of the tray assembly 1 away from the forming platform 4. The auxiliary member 84 may be disposed on the side of the support member 21 facing the release film 11, so that when the release film 11 and the support member 21 are in contact and have a tendency to move away from the support member 21, a peeling angle is formed between the release film 11 and the support member 21. In addition, the auxiliary member 84 can also prevent the release film 11 from collapsing, thereby better ensuring that the gas chamber 100 meets the preset height.

[0098] The tray assembly 1 in this embodiment may be a stretched film structure. Specifically, the tray assembly 1 may further include a tray body 12 connected to the outer periphery of the release film 11. The release film 11 is connected to the tray body 12 in a stretched state, so that one end of the tray body 12 is closed. In this way, the tray assembly 1 can be used to hold printing materials.

[0099] Furthermore, the support member 21 can be used to support the release film 11 of the tray assembly 1 during the 3D printing process, thereby providing a flat support surface for the printed material located between the release film 11 and the molding surface 82 of the molding platform 4 during the 3D printing process, thereby improving the flatness of the cured layer. Specifically, the support member 21 can be made of a light-transmitting material, or at least a partially light-transmitting material, to allow light to pass through the support member 21 and through the release film 11 to cure the printed material in the tray assembly 1.

[0100] The auxiliary member 84 further provides auxiliary support for the release film 11, thereby forming a certain distance between the release film 11 and the support member 21, namely, the gas chamber 100. Specifically, the number of auxiliary members 84 can be one or more. When there are multiple auxiliary members 84, they can be arranged on one side of the support member 21 at intervals. Furthermore, the auxiliary member 84 can be arranged at the periphery of the support member 21. Of course, in some embodiments, it can also be arranged in the middle of the support member 21; or it can be arranged partially at the periphery and partially in the middle. The specific arrangement can be based on actual needs and is not specifically limited here.

[0101] It should be noted that during the 3D printing process, the formation of each solidified layer may include pressing down the forming platform 4 to drain the liquid, exposing the printed material to a light source to solidify it, and then raising the forming platform 4 to separate the solidified layer from the release film 11. After the forming platform 4 is pressed down, the release film 11 tends to adhere to the support surface of the support member 21 facing the release film 11, forming a vacuum adsorption that makes it difficult to separate. This results in the release film 11 exerting a large pulling force on the printed part during the process of raising the forming platform 4 to separate the printed part from the release film 11, which can easily lead to consequences such as printing failure or poor surface quality of the printed part.

[0102] In this embodiment, an auxiliary part 84 is further provided on the support part 21, so that a gas chamber 100 is formed between the release film 11 and the support part 21. Even when the forming platform 4 is pressed down to form vacuum adsorption between the release film 11 and the support part 21 to form a fit, since the auxiliary part 84 still forms a gas chamber 100 between the support part 21 and the release film 11, when the forming platform 4 rises to peel the printed part 7 from the release film 11, the release film 11 is driven to move in a direction away from the support part 21. At this time, a peeling angle α as shown in Figure 12 is formed between the release film 11 and the support part 21 due to the existence of the gas chamber. It should be noted that the existence of the peeling angle α can reduce the difficulty of breaking the vacuum environment between the release film 11 and the support member 21 when the release film 11 is pulled, that is, the release film 11 and the support member 21 are easily separated, thereby greatly reducing the peeling force between the release film 11 and the printed part 7 during the rising and peeling process of the forming platform 4, making it easier for the printed part 7 to be peeled off from the release film 11, thereby improving the printing success rate and printing efficiency, reducing the risk of the printed part 7 falling from the forming platform 4 during the rising and peeling process of the forming platform 4, and improving the quality of the printed part 7.

[0103] In one embodiment, the number of auxiliary members 84 is at least two, and they are dispersed along the circumference of the release film 11. Specifically, the number of auxiliary members 84 can be two, three, five, ten, etc., and they can be evenly dispersed around the gas chamber 100 or randomly dispersed.

[0104] In one embodiment, the auxiliary member 84 can be configured to form a gas chamber 100 with a uniform height between the support member 21 and the release film 11. It should be noted that this refers to the situation when the molding platform 4 does not press down the release film 11.

[0105] Furthermore, the height of the gas chamber 100 can be 0.2-0.3 mm, specifically 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, etc. Controlling the height can effectively reduce the peeling force between the printed part and the release film 11 .

[0106] In one application scenario, by providing gas into the gas chamber 100 , the vacuum adsorption between the release film 11 and the support member 21 can be broken during the rising process of the molding platform 4 , thereby making it easier to separate the release film 11 and the support member 21 .

[0107] It should be noted that the high degree of consistency here refers to consistency within a certain error range, and is not limited to strict consistency. Of course, in another embodiment, a gas chamber with a different height can be formed between the support member 21 and the release film 11, as long as the above-mentioned easy peeling requirement is met, which is not limited here.

[0108] In one embodiment, there may be four auxiliary members 84 , which are respectively disposed corresponding to the four corners of the support member 21 , as specifically shown in FIG. 8-11 .

[0109] In one embodiment, there may be four auxiliary members 84, which are respectively disposed on the four edges of the support member 21, as shown in Figures 13 to 15. The auxiliary members 84 may be located at the center of the corresponding edge, or at other locations.

[0110] In one embodiment, the auxiliary member 84 can be arranged according to the shape of the support member 21, and can be, for example, circular, polygonal, or irregular in shape. In one application scenario, the shape can be circular, in which case the auxiliary member 84 can be arranged around the circumference of the support member 21. In another application scenario, the shape can be polygonal, in which case the auxiliary member 84 can be arranged corresponding to the corners of the polygon or the edges of the polygon, without specific limitation herein.

[0111] In one embodiment, the auxiliary member 84 may be any one or a combination of tape, plastic plate, metal gasket, foam, wooden sheet, fiber cloth, etc., or may be other types of suitable materials.

[0112] In one embodiment, the auxiliary member 84 is a tape for bonding to the support member 21. The thickness of the tape is 0.1-0.3 mm, specifically 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, in some application scenarios, the tape can also be bonded to the release film 11.

[0113] Furthermore, the tape can be composed of a base material and an adhesive backing, and can be single-sided adhesive, double-sided adhesive, or unadhesive. The base material of the tape can be cast polypropylene film (CPP), oriented polypropylene film (OPP), biaxially oriented polypropylene film (BOPP), polyethylene (PE), uniaxially oriented polypropylene film (MOPP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), Teflon, Teflon fiber cloth, acetate cloth, cloth base, foam, metal foil, masking tape, etc. The adhesive backing can be made of water-based adhesive, oil-based adhesive, hot melt adhesive, natural rubber, synthetic rubber, etc., without specific limitation herein.

[0114] In some embodiments, the pulse gas supply assembly 3 further includes a control valve to control the intermittent flow of gas into the gas chamber 100. The provision of a control valve facilitates controlled gas flow into the gas chamber, allowing intermittent gas supply as needed, such as oscillating gas. Of course, gas can also be supplied continuously, or continuously for a period of time as needed and intermittently for a period of time. This is not a limitation and can be configured by those skilled in the art based on process strategies and other factors.

[0115] In some embodiments, the support member is a transparent rigid support member 21a or a transparent flexible support member 21b. When the support member 21 is a transparent flexible support member 21b, a gas chamber 100 is formed between the release film 11 and the transparent flexible support member 21b. An auxiliary member can be provided on the flexible support member 21b to support the release film 11 and better maintain the gas chamber 100 to meet a preset height (thickness), as shown in FIG8 . The auxiliary member 84 can be provided on the side of the support member 21 facing the release film 11, so that when the release film 11 and the support member 21 are attached and have a tendency to move away from the support member 21, a peeling cut angle is formed between the release film 11 and the support member 21.

[0116] In some embodiments, the support assembly 2 further includes a rigid substrate 23 disposed below the transparent flexible support member 21b to provide support, ensure the consistency of the release film 11 during printing, and provide a stable molding surface, as shown in Figure 7. The rigid substrate can be a glass support plate, a plastic support plate, or a display screen such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, etc., without specific limitation herein.

[0117] In some embodiments, the support member 21 and the rigid substrate 23 have a third preset distance in the height direction. In the initial state, the release film 11 , the transparent flexible support member 21 b and the transparent rigid substrate 23 are all in a separated state. When the molding platform 4 and the printed work 7 are pressed down on the release film 11, the bottom surface of the release film 11 is in contact with the upper surface of the transparent flexible support 21b, and the bottom surface of the transparent flexible support 21b is in contact with the upper surface of the rigid substrate 23, so that a stable molding surface can be provided for exposure and curing through the transparent rigid substrate 23; during peeling, the pulsed airflow enters between the release film 11 and the transparent flexible support 21b, and both the release film 11 and the transparent flexible support 21b will oscillate at high frequencies, and the oscillation directions are opposite, which intensifies the volume change of the gas in the gas chamber 100 and reduces the size of the intake pressure, thereby reducing the influence of the excessive oscillation amplitude of the release film 11 on the molding quality of the peeling surface of the solid polymer (i.e., the printed work 7), and can quickly break the vacuum adsorption effect formed by the adhesion between the release film 11 and the transparent flexible support 21b below. The transparent flexible support 21b and the transparent rigid substrate 23 will also be separated due to the oscillation, which will not affect the peeling of the printed work 7.

[0118] It should be noted that the third preset distance is smaller than the first preset distance to avoid the spacing between the release film 11 and the rigid substrate 23 being too large to affect the molding accuracy. In order to ensure that there is a third preset distance between the transparent flexible support 21b and the rigid substrate 23, a connecting member 24 with thickness is provided along the circumference of the transparent rigid substrate 23, as shown in Figure 7.

[0119] Since the release film 11 and the transparent flexible support member 21b need to withstand repeated pressure and peeling, in some embodiments of the present disclosure, the release film 11 and the transparent flexible support member 21b are fluoropolymer films. Since the fluoropolymer film has good mechanical strength, it can withstand repeated pressure and peeling of the forming platform 4. In addition, the fluoropolymer film also has the advantages of good chemical stability and good thermal stability, and is suitable for 3D printing. In some embodiments, the fluoropolymer film includes the following types: FEP (fluoroethylene propylene copolymer) film, PTFE (polytetrafluoroethylene) film, nFEP film (a film made by combining FEP resin and PTFE resin copolymer), PFA (polytetrafluoroethylene copolymer) film, PVDF (polyvinylidene fluoride) film, PVF (polyvinyl fluoride film) film, ETFE (ethylene-tetrafluoroethylene copolymer) film, etc.

[0120] In some embodiments, the transparent flexible support member 21b can also be a polydimethylsiloxane (PDMS) film or a polymethylpentene (PMP) film, both of which have the advantage of high transparency and will not affect the exposure and curing of the printed part 7. Among them, the PDMS film has high elasticity and resilience, and also has excellent weather resistance and temperature resistance (-60 to 200°C); the PMP film has a very low surface tension of only 24mN / m, which is even lower than some fluororesins. Compared with other materials, it has excellent peelability, and it is easy to peel off the release film 11 and the transparent flexible support member 21b.

[0121] In one embodiment, the support member 21 may be rigid, such as a hard support plate, specifically a glass support plate, a plastic support plate, etc., or a display screen, such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, etc., which are not specifically limited here.

[0122] In some embodiments, the support member 21 is one of fluoropolymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, heat-sensitive resin, glass, screen, or a combination of several of them.

[0123] In the above embodiment, the pulse release module (PRM) provided by the present invention can fill the gas chamber at the bottom of the material tray with pulse airflow (PA), forming pulse peeling when peeling the printed part 7. When the bottom layer of the printed part 7 is peeled off from the release film 11, under the action of the pulse airflow, the release film 11 vibrates at a high frequency, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, eliminate the vacuum adsorption force, reduce the peeling force during peeling, and avoid the sudden change of peeling force when the release film 11 is separated from the support member 21; after the release film 11 is separated from the support member 21, the release film 11 continues to generate physical oscillation motion under the action of the pulse airflow, providing line peeling from the edge to the center during the peeling process, realizing a side peeling effect, which can greatly reduce the peeling force value, improve the success rate of the release of the layer of printed part 7, improve printing efficiency and printing success rate, and reduce the risk of board falling.

[0124] Please refer to Figures 1 to 18. The second aspect of the embodiment of the present disclosure provides a pulse stripping material tray, which has a release film 11 and a support member 21. The support member 21 has a second preset distance from the release film 11 in the height direction, so as to form a gas chamber 100 between the support member 21 and the release film 11; the support member 21 is respectively provided with an air inlet 211 and an air outlet 212 which are connected to the gas chamber 100; the air inlet 211 and the air outlet 212 are used to connect with the pulse gas providing component 3. The pulse gas providing component 3 inputs a pulse airflow into the gas chamber through the air inlet 211, so that the gas volume in the gas chamber 100 changes periodically, and the release film 11 oscillates periodically, so that when the printed part 7 is peeled off from the release film 11, the release film 11 shakes in a wave-like manner during the peeling process, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, and at the same time, it can also make the bottom surface of the printed part 7 and the release film 11 reach the critical value of the peeling angle within a shorter peeling stroke, which is beneficial to reduce the peeling force and peeling stroke, improve printing efficiency and printing success rate, and reduce the risk of board falling.

[0125] In some embodiments, the pulse stripping tray may be the tray assembly in the first aspect of the embodiment of the present disclosure, and the second preset distance may be equal to the first preset distance.

[0126] In some embodiments, the support assembly 2 may include a support member 21 and an auxiliary member 84. The support member 21 may be disposed on one side of the tray assembly 1, specifically on the side of the tray assembly 1 away from the forming platform 4. The auxiliary member 84 may be disposed on the side of the support member 21 facing the release film 11, so that when the release film 11 and the support member 21 are in contact and tend to move away from the support member 21, a peeling angle is formed between the release film 11 and the support member 21.

[0127] The tray assembly 1 in this embodiment may be a stretched film structure. Specifically, the tray assembly 1 may further include a tray body 12 connected to the outer periphery of the release film 11. The release film 11 is connected to the tray body 12 in a stretched state, so that one end of the tray body 12 is closed. In this way, the tray assembly 1 can be used to hold printing materials.

[0128] Furthermore, the support member 21 can be used to support the release film 11 of the tray assembly 1 during the 3D printing process, thereby providing a flat support surface for the printed material located between the release film 11 and the molding surface 82 of the molding platform 4 during the 3D printing process, thereby improving the flatness of the cured layer. Specifically, the support member 21 can be made of a light-transmitting material, or at least a partially light-transmitting material, to allow light to pass through the support member 21 and through the release film 11 to cure the printed material in the tray assembly 1.

[0129] The auxiliary member 84 further provides auxiliary support for the release film 11, thereby forming a certain distance between the release film 11 and the support member 21, namely, the gas chamber 100. Specifically, the number of auxiliary members 84 can be one or more. When there are multiple auxiliary members 84, they can be arranged on one side of the support member 21 at intervals. Furthermore, the auxiliary member 84 can be arranged at the periphery of the support member 21. Of course, in some embodiments, it can also be arranged in the middle of the support member 21; or it can be arranged partially at the periphery and partially in the middle. The specific arrangement can be based on actual needs and is not specifically limited here.

[0130] It should be noted that during the 3D printing process, the formation process of each solidified layer may include pressing down the forming platform 4 to drain the liquid, exposing the printed material to a light source to solidify it, and then raising the forming platform 4 to separate the solidified layer from the release film 11. After the forming platform 4 is pressed down, the release film 11 tends to adhere to the support surface of the support member 21 facing the release film 11, forming a vacuum adsorption that is difficult to separate. This results in the release film 11 exerting a large pulling force on the printed part during the separation process between the printed part and the release film 11 when the forming platform 4 rises, which can easily lead to consequences such as printing failure or poor surface quality of the printed part.

[0131] In this embodiment, an auxiliary part 84 is further provided on the support part 21, so that a gas chamber 100 is formed between the release film 11 and the support part 21. Even when the forming platform 4 is pressed down to form vacuum adsorption between the release film 11 and the support part 21 to form a fit, since the auxiliary part 84 still forms a gas chamber 100 between the support part 21 and the release film 11, when the forming platform 4 rises to peel the printed part 7 from the release film 11, the release film 11 is driven to move in a direction away from the support part 21. At this time, a peeling angle α as shown in Figure 12 is formed between the release film 11 and the support part 21 due to the existence of the gas chamber 100. It should be noted that the existence of the peeling angle α can reduce the difficulty of breaking the vacuum environment between the release film 11 and the support member 21 when the release film 11 is pulled, that is, the release film 11 and the support member 21 are easily separated, thereby greatly reducing the peeling force between the release film 11 and the printed part 7 during the rising and peeling process of the forming platform 4, making it easier for the printed part 7 to be peeled off from the release film 11, thereby improving the printing success rate and printing efficiency, reducing the risk of the printed part 7 falling from the forming platform 4 during the rising and peeling process of the forming platform 4, and improving the quality of the printed part 7.

[0132] In one embodiment, the number of auxiliary members 84 is at least two, and they are dispersed along the circumference of the release film 11. Specifically, the number of auxiliary members 84 can be two, three, five, ten, etc., and they can be uniformly dispersed around the fixed gas chamber 100 or randomly dispersed.

[0133] In one embodiment, the auxiliary member 84 can be configured to form a gas chamber 100 with a uniform height between the support member 21 and the release film 11. It should be noted that this refers to the situation when the molding platform 4 does not press down the release film 11.

[0134] Furthermore, the height of the gas chamber 100 can be 0.2-0.3 mm, specifically 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, etc. Controlling the height can effectively reduce the peeling force between the printed part and the release film 11 .

[0135] In this way, ventilation design can be further performed to provide gas, such as at least one of oxygen, nitrogen, and inert gas, between the release film 11 and the support member 21 according to actual needs.

[0136] In one application scenario, by providing gas into the gas chamber 100 , the vacuum adsorption between the release film 11 and the support member 21 can be broken during the rising process of the molding platform 4 , thereby making it easier to separate the release film 11 and the support member 21 .

[0137] It should be noted that the high degree of consistency here refers to consistency within a certain error range, and is not limited to strict consistency. Of course, in another embodiment, a gas chamber with a different height can be formed between the support member 21 and the release film 11, as long as the above-mentioned easy peeling requirement is met, which is not limited here.

[0138] In one embodiment, there may be four auxiliary members 84 , which are respectively disposed corresponding to the four corners of the support member 21 , as specifically shown in FIG. 7-11 .

[0139] In one embodiment, there may be four auxiliary members 84, which are respectively disposed on the four edges of the support member 21, as shown in Figures 13 to 15. The auxiliary members 84 may be located at the center of the corresponding edge, or at other locations.

[0140] In one embodiment, the auxiliary member 84 can be arranged according to the shape of the support member 21, and can be, for example, circular, polygonal, or irregular in shape. In one application scenario, the shape can be circular, in which case the auxiliary member 84 can be arranged around the circumference of the support member 21. In another application scenario, the shape can be polygonal, in which case the auxiliary member 84 can be arranged corresponding to the corners of the polygon or the edges of the polygon, without specific limitation herein.

[0141] In one embodiment, the auxiliary member 84 may be any one or a combination of tape, plastic plate, metal gasket, foam, wooden sheet, fiber cloth, etc., or may be other types of suitable materials.

[0142] In one embodiment, the auxiliary member 84 is a tape for bonding to the support member 21. The thickness of the tape is 0.1-0.3 mm, specifically 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, in some application scenarios, the tape can also be bonded to the release film 11.

[0143] Furthermore, the tape can be composed of a base material and an adhesive backing, and can be single-sided adhesive, double-sided adhesive, or unadhesive. The base material of the tape can be cast polypropylene film (CPP), oriented polypropylene film (OPP), biaxially oriented polypropylene film (BOPP), polyethylene (PE), uniaxially oriented polypropylene film (MOPP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), Teflon, Teflon fiber cloth, acetate cloth, cloth base, foam, metal foil, masking tape, etc. The adhesive backing can be made of water-based adhesive, oil-based adhesive, hot melt adhesive, natural rubber, synthetic rubber, etc., without specific limitation herein.

[0144] In some embodiments, the support assembly 2 further includes a rigid substrate 23 disposed below the transparent flexible support member 21b. The rigid substrate may be a glass support plate, a plastic support plate, or a display screen such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, or other hard parts, which are not specifically limited herein. The rigid substrate 23 provides support, ensures consistency during printing of the release film (11), and provides a stable molding surface.

[0145] In some embodiments, the transparent flexible support member 21b is a fluoropolymer film, a polydimethylsiloxane film, or a polymethylpentene film. In some embodiments, the fluoropolymer film includes the following types: FEP (fluorinated ethylene propylene copolymer) film, PTFE (polytetrafluoroethylene) film, nFEP film (a film made by combining a copolymer of FEP resin and PTFE resin), PFA (polytetrafluoroethylene copolymer), PVDF (polyvinylidene fluoride) film, PVF (polyvinyl fluoride film), ETFE (ethylene-tetrafluoroethylene copolymer) film, etc.

[0146] In some embodiments, the transparent flexible support member 21b may also be a polydimethylsiloxane (PDMS) film or a polymethylpentene (PMP) film. Both have the advantage of high transparency and will not affect the exposure and curing of the printed part 7. The PDMS film has high elasticity and resilience, and excellent weather resistance and temperature resistance (-60 to 200°C). The PMP film has a very low surface tension of only 24mN / m, which is even lower than some fluororesins. Compared with other materials, it has excellent peelability, making it easy to peel the release film 11 from the transparent flexible support member 21b.

[0147] In some embodiments, the transparent flexible support member 21b is one of fluoropolymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and thermosensitive resin, or a combination of several thereof.

[0148] In the above embodiment, the pulse gas supply component 3 of the pulse release resin tank (PRRT) provided by the present invention inputs a pulse airflow into the gas chamber through the air inlet 211, so that the gas volume in the gas chamber 100 changes periodically, and the release film 11 oscillates periodically, so that when the printed part 7 is peeled off from the release film 11, the release film 11 shakes in a wave-like manner during the peeling process, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, and at the same time, it can also make the bottom surface of the printed part 7 and the release film 11 reach the critical value of the peeling angle within a shorter peeling stroke d, which is beneficial to reducing the peeling force and peeling stroke, improving printing efficiency and printing success rate, and reducing the risk of board falling.

[0149] The third aspect of the embodiment of the present disclosure provides a 3D printing device, please refer to Figures 1 to 18, including the pulse stripping module in the above embodiment or the pulse stripping tray provided in the second aspect of the present disclosure, and also including a molding platform 4, an optical machine 5 and a control system 6. The molding platform 4 is arranged above the tray assembly 1, and can drive the printed part 7 to move in the vertical direction to achieve the molding and stripping of the printed part 7; the optical machine 5 is arranged below the support assembly 2, and is used to penetrate the support member 21 and expose and cure the bottom layer of the printed part 7; the control system 6 is respectively associated with the molding platform 4, the optical machine 5 and the pulse gas supply assembly 3, and is used to send control signals to each component. The control system 6 in this embodiment is respectively associated with the molding platform 4, the optical machine 5 and the pulse gas supply assembly 3, including but not limited to connection, physical connection, communication connection, as long as it can enable each component to interact, communicate, and exchange data information.

[0150] In some embodiments of the present disclosure, the control system 6 communicates with the pulse gas providing component 3 to generate a control instruction according to a pre-configured control strategy and send the control instruction to the pulse gas providing component 3 .

[0151] The control system 6 in the embodiment of the present invention can also be used to control the pulse gas supply component 3 to increase or decrease the gas delivered based on the control instructions generated by the pre-configured control strategy. For example, the control strategy is configured as follows: when it is detected that the release film of the 3D printing device is higher than the preset calibration position, the gas pressure in the 3D printing device is higher than the preset pressure range, the gas flow in the 3D printing device is higher than the preset range, the concentration of the gas in the 3D printing device is higher than the preset concentration range, and the bearing capacity of the lower surface of the release film of the 3D printing device is greater than the bearing capacity of the upper surface, it indicates that the pulse gas supply component 3 has delivered too much gas to the 3D printer and the gas pressure and concentration formed in the 3D printing device need to be adjusted. Therefore, the control strategy at this time is to generate and send a first control instruction; wherein, the first control instruction includes controlling the pulse gas supply component 3 to reduce the gas delivered;

[0152] When it is detected that the release film of the 3D printing device is below a preset calibration position, the gas pressure in the 3D printing device is below a preset pressure range, the gas flow in the 3D printing device is below a preset range, the gas concentration in the 3D printing device is below a preset concentration range, or the upper surface bearing force of the release film of the 3D printing device is less than the lower surface bearing force, it indicates that the pulse gas supply component 3 has already delivered too little gas to the 3D printing device, which may affect the curing effect of the resin material and make it difficult to peel it from the material tray. The gas pressure and concentration formed in the 3D printing device need to be adjusted. Therefore, the control strategy at this time is to generate and send a second control instruction, which includes controlling the pulse gas supply component 3 to increase the gas delivered.

[0153] It should be noted that the height of the release film 11, the gas pressure, airflow, concentration, and the bearing capacity of the lower surface of the release film 11 can all be directly collected using corresponding sensors, or obtained through data processing based on the data collected by the sensors. For example, to obtain the bearing capacity of the upper surface of the release film 11 of a 3D printing device, the volume of the printing material can be detected and converted into weight to determine the bearing capacity of the release film 11 surface. By installing a weighing sensor at the bottom of the material tray and detecting the total weight of the material tray and printing material, the bearing capacity of the release film 11 surface can be determined, that is, the balance between the action and reaction forces on the upper and lower surfaces of the film.

[0154] Accordingly, in one embodiment, the build platform 4 includes a clearance feature 83 for clearing the auxiliary member 84. This clearance feature 83 prevents the build platform 4 from pressing against the auxiliary member 84 when the build platform 4 is pressed downward during 3D printing. It should be noted that if the build platform 4 presses against the auxiliary member 84, due to its thickness, the first layer of printing may be thicker, potentially causing the printed part to fall off the build platform 4 and other printing failures.

[0155] In one embodiment, the avoidance design 83 is at least one of a corner cut, a groove, etc. Specifically, the position of the forming platform 4 corresponding to the auxiliary component 84 can be directly cut away; or a concave structure can be provided at the position of the forming platform 4 corresponding to the auxiliary component 84 to accommodate the corresponding auxiliary component 84.

[0156] Specifically, in the embodiments shown in Figures 7 to 11 , the forming platform 4 has avoidance cutouts at locations corresponding to the auxiliary members 84. In the embodiments shown in Figures 13 to 15 , corresponding avoidance grooves are provided on the periphery of the forming platform 4 to offset the auxiliary members 84 when the forming platform 4 is pressed downward. Similarly, the embodiments shown in Figures 6 to 8 of this embodiment can also employ similar avoidance designs.

[0157] In the 3D printing device provided by the disclosed embodiments, the pulse stripping module can be controlled as an independent module. When pulse stripping is required, the control system 6 simply sends an action signal to the gas oscillation component 31, causing the gas pipeline 32 to output a pulsed airflow with a predetermined pulse frequency and output pressure, forming a closed-loop control system. The airflow pipeline configuration and control methods are simple. The pulse stripping module can also be integrated into the 3D printing device and controlled by the 3D printer's control system.

[0158] In some embodiments, the support assembly 2 is disposed on a base 81 , which is a portion of a housing of the 3D printing device.

[0159] A fourth aspect of the present disclosure provides a 3D printing method, as shown in FIG10 , which uses the 3D printing device in the above embodiment and includes the following steps:

[0160] Step 1: Obtain a collection of slice images corresponding to the 3D model to be printed, and calculate the printing difficulty value corresponding to each slice image;

[0161] Specifically, the three-dimensional model of the printed part 7 is input into the computer, and the collection of slice images corresponding to the printed part 7 is obtained through the control system 6 installed in the computer. The printing difficulty value corresponding to each layer of the slice image is calculated based on the cross-sectional information corresponding to the slice image. The method for confirming the printing difficulty value can refer to the Chinese patent application document with application number 202310235431.5.

[0162] Step 2: Based on the printing difficulty value, determine the printing parameters and pulse airflow parameters corresponding to each layer of the slice image;

[0163] Specifically, the determination of printing parameters can be made with reference to the Chinese patent application document with application number 202310235431.5. The pulse airflow parameters include pulse frequency and output air pressure. Among them, the pulse frequency is directly proportional to the printing difficulty value. The greater the printing difficulty value, the greater the pulse frequency. This is because when the printing difficulty value is large, it usually means that there are a large number of cross-sections in the layer of printed parts 7 or the minimum spacing between the cross-sections is small, etc., requiring fine printing and peeling. The greater the pulse frequency, the faster the vibration of the release film 11 and the greater the amplitude. The release film 11 and the bottom layer of the printed part 7 can reach the critical value of the peeling angle θ more quickly, reducing the peeling force while improving the peeling efficiency. Preferably, the pulse frequency range is 0.1Hz-50000Hz.

[0164] The output air pressure is directly proportional to the volume of the gas chamber. When the volume of the gas chamber is small, if the output air pressure is too high, the release film 11 will bulge, which is not conducive to the oscillation of the release film 11. When the volume of the gas chamber is large, if the output air pressure is too low, the oscillation of the release film 11 will be less obvious. Preferably, the output air pressure ranges from 0.1 Pa to 100,000 Pa.

[0165] Step 3: Determine the model printing operation corresponding to each layer of the slice image based on the printing parameters, and determine the model peeling operation corresponding to each layer of the slice image based on the pulse airflow parameters.

[0166] Specifically, liquid photosensitive resin material is contained in the material trough formed by the release film 11 and the material tray body 12; after printing starts, the printing of the printed part 7 is realized layer by layer by lifting and lowering the forming platform 4. When printing the nth layer, the forming platform 4 is pressed down to make the bottom of the printed part 7 contact with the liquid photosensitive resin material in the material tray, and the optical machine 5 performs exposure and curing according to the cross-sectional shape of the slice image corresponding to the layer; after the exposure is completed, the control system 6 communicates with the gas vibration component to deliver a pulsed airflow into the gas chamber to break the vacuum adsorption state between the release film 11 and the support member 21; after the release film 11 is separated from the support member 21, the pulsed airflow oscillates the release film 11, the forming platform 4 rises, and the peeling operation between the printed part 7 and the release film 11 is started. When the model is peeled off, a pulsed airflow is introduced into the air inlet 211 at a pulse frequency, so that the volume of the gas chamber changes periodically, and its change frequency is similar to the pulse frequency, so that the release film 11 produces periodic oscillations. The frequency and amplitude of this oscillation effect are related to the control signal sent by the control system 6 to the gas oscillation component 31, so that the peeling angle critical value θ between the release film 11 and the bottom layer of the printed part 7 can be reached more quickly, as shown in Figure 5, which can significantly reduce the peeling force and peeling stroke.

[0167] After the peeling is completed, the forming platform 4 is reset to zero, the pulsed airflow stops or weakens, and the oscillation of the release film 11 stops or weakens. At this time, the next layer (ie, the n+1 layer) can be printed.

[0168] In order to verify the peeling effect of the pulse peeling module provided in the embodiment of the present disclosure, the inventor applied the pulse peeling module provided in the present disclosure to the Reflex printer of Heige Technology, used Heige Technology PAU10 material for 3D printing, and provided the following verification examples:

[0169] Verification Example 1: Printing a cantilever beam model and a bridge model can be used to evaluate the effectiveness of pulse peeling and its effect on reducing support density. Since the cantilever beam model has a cantilever beam extending to one side, if the peeling force is too large during peeling, the cantilever beam will bend, resulting in a limited cantilever span. When printing using 3D printing equipment in the prior art, the forming span is usually 1.2mm; and when the bridge model has a larger span between the two fulcrums, if the peeling force is too large, the middle beam will bend. To avoid this problem, it is often necessary to increase the support density. When printing PAU10 material using 3D printing equipment in the prior art, the span between the two fulcrums is only 2.6mm.

[0170] When printing with a Reflex printer equipped with a pulse peeling module, the peeling effectiveness is improved in the pulse peeling mode due to the reduced peeling force. The forming span of a single cantilever beam is increased from 1.2mm to 1.6mm, and the forming span of a bridge model is increased from 2.6mm to 3.4mm. The equivalent calculated support density can be reduced by 20%.

[0171] Verification Example 2: Printing a miniature model can be used to evaluate the improvement in the printing success rate of small parts by pulse peeling, as well as the optimization effects of peeling force and printing time. Due to the small size of the miniature model, the printing and peeling difficulties are both high. When printing using the 3D printing equipment in the existing technology, some details may not be fully printed.

[0172] When printing with a Reflex printer equipped with a pulse peeling module, the miniature model can be printed completely, and the peeling force value during printing is reduced by 20%-50%, and the printing time is shortened by 40%.

[0173] Verification Example 3: Printing a detailed molded part test model to evaluate the optimization of pulse peeling on detailed molding. Due to the small cross-section of the detailed molded part test model, when printed using existing 3D printing equipment, the peeled state can completely form a cylinder with a diameter of 0.6mm and a height of 10mm, but details with a precision of 0.1mm may not be fully formed.

[0174] When printing with a Reflex printer equipped with a pulse peeling module, a cylinder with a diameter of 0.3mm and a height of 10mm can be completely formed, and the minimum molding detail can be within 0.08mm.

[0175] Verification Example 4: Printing a long-life test piece can be used to evaluate the optimization of the pulse peeling on the tray life.

[0176] When printing using a Reflex printer equipped with a pulse peeling module, there is no abnormality in the surface quality of the peeled print 7. Compared with the material tray in the prior art, the release film 11 in the present disclosure has a significantly reduced peeling force, and the life of the release film 11 can be increased by 27% to 38%.

[0177] Verification Example Five: Printing a peeling stroke test piece can be used to evaluate the optimization of the peeling stroke by pulse peeling. Please refer to Figures 4 and 5. When printing using the 3D printing equipment in the prior art, the release film 11 in the material tray assembly 1 will undergo elastic deformation under the pulling action of the bottom layer of the printed part 7 until the bottom layer of the printed part 7 and the release film 11 reach the critical value of the peeling angle θ. As shown in Figure 4, the peeling stroke is longer.

[0178] When printing with a Reflex printer equipped with a pulse peeling module, the release film 11 can undergo high-frequency oscillation under the action of the pulsed airflow, which can make the peeling angle critical value θ between the bottom layer of the printed part 7 and the release film 11 reach it more quickly. As shown in Figure 5, the peeling stroke can be reduced by 32% to 47%, which is conducive to improving the peeling efficiency.

[0179] It can be seen from the above embodiments that the pulse peeling module and pulse peeling tray provided in the embodiments of the present disclosure can significantly reduce the peeling force during peeling, which is beneficial to improving the molding accuracy of the model, improving the effectiveness of pulse peeling and improving the service life of the release film 11; after reducing the peeling stroke, the peeling time can be significantly reduced, the peeling efficiency can be improved and the printing time can be reduced.

[0180] The present disclosure provides a three-dimensional printing system, which includes: a material tray assembly, which has an at least partially transparent release film; a support assembly, which has an at least partially transparent support member, wherein a gas chamber is formed between the support member and the release film, and the gas chamber is connected to an air inlet and an air outlet; and a gas supply assembly, which is configured to deliver gas to the gas chamber and is configured to cause periodic changes in the volume of the gas chamber.

[0181] In some embodiments, the support member and the release film define a gas chamber. In other embodiments, the support member, the release film, and the sealing member define a gas chamber. It is understood that when the build platform drives the release film toward the support member, a vacuum is formed between the release film and the support member, which hinders the subsequent separation of the build platform (and the release film adhered to the build platform) from the support member. Gas provided by the gas supply assembly can be directed into the gas chamber to at least partially eliminate the vacuum, thereby facilitating separation of the release film from the support member.

[0182] To facilitate separation of the build platform (or the object solidified thereon) from the release film, the gas chamber of the present disclosure has a varying volume or capacity during the peeling process (i.e., the process of the build platform moving away from the release film or away from the support). The continuous or periodic variation in the volume or capacity of the gas chamber causes the air pressure within the gas chamber to rise or fall. During this pressure drop, the release film is subjected to a force tending to move the release film toward the support, while the object solidified on the build platform remains subjected to a force tending to move the object away from the support. This facilitates separation of the object solidified on the build platform from the release film.

[0183] It is understandable that during the peeling process, as the forming platform moves away from the release film or away from the support, the degree of extension of the release film will increase. After the predetermined peeling stroke, the peeling force between the solidified object on the forming platform and the release film reaches the predetermined peeling force, thereby separating the solidified object on the forming platform from the release film. Due to the provision of a pulsed airflow (or, the volume or capacity of the gas chamber continuously or periodically changes), at a distance less than the predetermined peeling stroke, the peeling force between the solidified object on the forming platform and the release film reaches the predetermined peeling force, thereby separating the solidified object on the forming platform from the release film. This shortens the overall peeling stroke, and the forming platform after peeling can move at a faster speed, thereby shortening the overall printing time.

[0184] In some embodiments, the gas supply assembly intermittently delivers gas to the gas chamber, that is, starts for a period of time and stops for a period of time, for example, starts for 1 second and stops for 0.5 seconds.

[0185] In some embodiments, the gas supply assembly delivers gas to the gas chamber at different flow rates, and the gas in the gas chamber is discharged through the gas outlet at the same flow rate. For example, the flow rate of the gas discharged through the gas outlet is a, the intake flow rate in a first time period is 1.2a, the intake flow rate in a subsequent second time period is 1.5a, and the intake flow rate in a subsequent third time period is 0.8a.

[0186] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0187] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0188] The foregoing are merely specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not to be limited to the embodiments shown herein, but is to be construed in the broadest manner consistent with the principles and novel features claimed herein. Industrial Applicability

[0189] The solution provided by the embodiment of the present disclosure can be applied to the field of 3D printing technology. In the embodiment of the present disclosure, the provided pulse stripping module includes a material tray assembly, a support assembly, and a pulse gas supply assembly; wherein, the pulse gas supply assembly inputs a pulse gas flow into the gas chamber, which can cause the gas volume in the gas chamber to change periodically, thereby causing the release film to oscillate periodically, and then quickly break the vacuum adsorption state between the release film and the support member, which is beneficial to reducing the peeling force and peeling stroke, improving printing efficiency and printing success rate, and reducing the risk of board falling. In the embodiment of the present disclosure, the provided pulse stripping material tray includes a release film and a support member, and a gas chamber is formed between the support member and the release film; the support member is respectively provided with an air inlet and an air outlet connected to the gas chamber, which are used to connect to the pulse gas supply assembly. In the embodiment of the present disclosure, the provided 3D printing device includes the above-mentioned pulse stripping module and the above-mentioned pulse stripping material tray. In an embodiment of the present disclosure, the 3D printing method provided includes the step of controlling a pulsed airflow, so that the release film produces periodic oscillations, and the vacuum adsorption state between the release film and the support member can be quickly broken, which is beneficial to reducing the peeling force and peeling stroke, improving printing efficiency and printing success rate, and reducing the risk of board drop. In an embodiment of the present disclosure, the 3D printing system provided includes a material tray assembly, a support assembly, and a gas supply assembly, so that the release film produces periodic oscillations, and the vacuum adsorption state between the release film and the support member can be quickly broken, which is beneficial to reducing the peeling force and peeling stroke, improving printing efficiency and printing success rate, and reducing the risk of board drop. It can be seen that the pulse peeling module provided in the embodiment of the present disclosure can improve printing efficiency and printing success rate, and reduce the risk of board drop.

Claims

1. A pulse stripping module, characterized in that: include: A material tray assembly (1), wherein the material tray assembly (1) has a release film (11); A support assembly (2), the support assembly (2) being arranged below the material tray assembly (1), the support assembly (2) comprising a support member (21), the support member (21) and the release film (11) having a first preset distance in a height direction, so as to form a gas chamber (100) between the support member (21) and the release film (11); the support member (21) being provided with an air inlet (211) and an air outlet (212) respectively connected to the gas chamber (100); A pulse gas supply component (3), the pulse gas supply component (3) comprising a gas oscillation component (31) and a gas supply pipeline (32), the gas oscillation component (31) being arranged on the gas supply pipeline (32), and the gas supply pipeline (32) being connected to the gas inlet (211).

2. The pulse stripping module according to claim 1, characterized in that: A sealing member (22) is provided along the circumference of the support member (21), and the sealing member (22) is used to be connected to the material tray assembly (1).

3. The pulse stripping module according to claim 2, characterized in that: The sealing member (22) is provided with a flow port (221) communicating with the gas chamber (100).

4. The pulse stripping module according to claim 1, characterized in that: An auxiliary part (84) is provided on the side of the support member (21) facing the release film (11), so that when the release film (11) and the support member (21) are attached to each other and have a tendency to move in a direction away from the support member (21), a peeling cut angle is formed between the release film (11) and the support member (21).

5. The pulse stripping module according to claim 4, characterized in that: The number of the auxiliary parts (84) is at least two, and they are dispersedly arranged along the circumference of the support part (21) to form a highly consistent gas chamber (100) between the support part (21) and the release film (11).

6. The pulse stripping module according to claim 5, characterized in that The number of the auxiliary parts (84) is four, and they are respectively arranged corresponding to the four corners of the support part (21); and / or the number of the auxiliary parts (84) is four, and they are respectively arranged corresponding to the four edges of the support part (21).

7. The pulse stripping module according to claim 4, characterized in that: The auxiliary component (84) is any one or more combinations of adhesive tape, plastic plate, metal gasket, foam, wooden sheet, and fiber cloth.

8. The pulse stripping module according to claim 1, characterized in that: The pulse gas supply component (3) also includes a control valve (34) to control the gas to enter the gas chamber (100) according to preset requirements.

9. The pulse stripping module according to any one of claims 1 to 8, characterized in that: The support member (21) is a transparent rigid support member (21a) or a transparent flexible support member (21b).

10. The pulse stripping module according to claim 9, characterized in that: When the support component (2) is a transparent flexible support member (21b), the support component (2) further comprises a rigid substrate (23) arranged below the transparent flexible support member (21b).

11. The pulse stripping module according to claim 1, characterized in that: The support member (21) is one or more combinations of fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, thermosensitive resin, glass, and screen.

12. A pulse stripping tray, characterized in that: The pulse stripping material tray comprises a release film (11) and a support member (21); the support member (21) and the release film (11) have a second preset distance in the height direction, so as to form a gas chamber (100) between the support member (21) and the release film (11); the support member (21) is provided with an air inlet (211) and an air outlet (212) respectively connected to the gas chamber; The gas inlet (211) and the gas outlet (212) are used to be connected to a pulse gas supply component (3).

13. The pulse stripping tray according to claim 12, characterized in that: The support member (21) is a transparent flexible support member (21b).

14. The pulse stripping tray according to claim 13, characterized in that: The transparent flexible support (21b) is one or more combinations of fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and thermosensitive resin.

15. The pulse stripping tray according to claim 13, characterized in that: The support member (21) also includes a rigid substrate (23) arranged below the transparent flexible support member (21b).

16. The pulse stripping tray according to claim 12, characterized in that: An auxiliary part (84) is provided on the side of the support member (21) facing the release film (11), so that when the release film (11) and the support member (21) are attached to each other and have a tendency to move in a direction away from the support member (21), a peeling cut angle is formed between the release film (11) and the support member (21).

17. The pulse stripping tray according to claim 16, characterized in that: The number of the auxiliary parts (84) is at least two, and they are dispersedly arranged along the circumference of the support part (21) to form a highly consistent gas chamber (100) between the support part (21) and the release film (11).

18. The pulse stripping tray according to claim 17, characterized in that: The number of the auxiliary parts (84) is four, and they are respectively arranged corresponding to the four corners of the support part (21); and / or the number of the auxiliary parts (84) is four, and they are respectively arranged corresponding to the four edges of the support part (21).

19. The pulse stripping tray according to claim 18, characterized in that: The auxiliary component (84) is any one or more combinations of adhesive tape, plastic plate, metal gasket, foam, wooden sheet, and fiber cloth.

20. The pulse stripping tray according to claim 12, characterized in that: The pulse stripping tray further comprises a tray body (12), on which a position sensor (13) is provided, and the position sensor (13) is used to detect position data of the release film (11).

21. A 3D printing device, comprising the pulse stripping module according to any one of claims 1 to 11 or the pulse stripping tray according to any one of claims 12 to 20, characterized in that: It also includes a molding platform (4), an optical machine (5) and a control system (6), wherein the molding platform (4) is arranged above the material tray assembly (1), the optical machine (5) is arranged below the support assembly (2), and the control system (6) is respectively associated with the molding platform (4), the optical machine (5) and the pulse gas supply assembly (3).

22. The 3D printing device according to claim 21, characterized in that: The control system (6) communicates with the pulse gas providing component (3) to generate control instructions according to a pre-configured control strategy and send the control instructions to the pulse gas providing component (3).

23. The 3D printing device according to claim 22, characterized in that: The control strategy is configured as: When it is detected that the release film (11) of the 3D printing device is higher than a preset calibration position, the gas pressure of the gas in the 3D printing device is higher than a preset pressure range, the gas flow of the gas in the 3D printing device is higher than a preset range, the concentration of the gas in the 3D printing device is higher than a preset concentration range, and the bearing force of the lower surface of the release film (11) of the 3D printing device is greater than the bearing force of the upper surface, a first control instruction is generated and sent; wherein the first control instruction includes controlling the gas delivered by the pulse gas supply component (3) to be reduced; When it is detected that the release film (11) of the 3D printing device is lower than a preset calibration position, the gas pressure in the 3D printing device is lower than a preset pressure range, the gas flow in the 3D printing device is lower than a preset range, the concentration of the gas in the 3D printing device is lower than a preset concentration range, and the upper surface bearing force of the release film (11) of the 3D printing device is lower than the lower surface bearing force, a second control instruction is generated and sent; wherein the second control instruction includes controlling the increase of gas delivered by the pulse gas supply component (3).

24. The 3D printing device according to claim 21, characterized in that: The molding platform (4) has an avoidance design (83) for avoiding auxiliary parts (84).

25. The 3D printing device according to claim 24, characterized in that: The avoidance design (83) is at least one of an avoidance cut corner and an avoidance groove.

26. A 3D printing method, using the 3D printing device according to any one of claims 21 to 25, characterized in that: The following steps are involved: Obtain a collection of slice images corresponding to the three-dimensional model to be printed, and calculate a printing difficulty value corresponding to each layer of the slice images; Based on the printing difficulty value, determining the printing parameters and pulse airflow parameters corresponding to each layer of the slice image; The model printing operation corresponding to each layer of the slice image is determined based on the printing parameters, and the model peeling operation corresponding to each layer of the slice image is determined based on the pulse airflow parameters.

27. The 3D printing method according to claim 26, characterized in that: The pulse airflow parameters include a pulse frequency, and the pulse frequency is directly proportional to the printing difficulty value.

28. The 3D printing method according to claim 27, characterized in that: The model stripping operation comprises: during model stripping, a pulsed airflow is introduced into the air inlet (211) at the pulse frequency, so that the volume of the gas chamber (100) changes periodically, and the release film (11) oscillates periodically.

29. A three-dimensional printing system, characterized in that: include: A material tray assembly (1) having a release film (11); A support assembly (2), the support assembly (2) comprising a support member (21), wherein a gas chamber (100) is formed between the support member (21) and the release film (11), and the gas chamber (100) is in communication with an air inlet (211) and an air outlet (212); A gas supply component is configured to deliver gas to the gas chamber (100) and to cause a periodic change in the volume of the gas chamber.

30. The three-dimensional printing system according to claim 29, characterized in that: The gas supply assembly is configured to intermittently deliver gas to the gas chamber (100).

31. The three-dimensional printing system according to claim 29, characterized in that: The gas supply component delivers gas to the gas chamber (100) at different flow rates, and the gas in the gas chamber (100) is discharged through the gas outlet (212) at the same flow rate.

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