3D printing system and method

Abstract

Disclosed are a 3D printing system and a method. The system comprises: a 3D printer, a controller and a gas separation apparatus. The controller communicates with the 3D printer, and is used to control the 3D printer to perform 3D printing. The controller also communicates with the gas separation apparatus, and is used to generate a control instruction on the basis of a pre-configured control strategy, and to send the control instruction to the gas separation apparatus. The gas separation apparatus is used to, based on the received control instruction, separate a target gas from air received from outside, so as to convey the target gas to the 3D printer. The present disclosure solves the technical problem in the prior art of there being no suitable stable gas supply apparatus for 3D printing.

Description

3D printing system and method Technical Field

[0001] The present application relates to the field of gas preparation, and more specifically, to a 3D printing system and method. Background Art

[0002] In DLP technology's light-curing 3D printing, there is adhesion between the cured resin and the material tray. This adhesive force needs to be overcome when the cured resin is peeled off from the material tray. The greater the adhesive force, the lower the 3D printing efficiency will be. In order to reduce the adhesive force, an oxygen-rich area needs to be formed between the resin and the material tray.

[0003] However, the preparation of oxygen-rich gas by cryogenic distillation, membrane separation, and pressure swing adsorption methods in related technologies has disadvantages such as large production volume, large investment, high energy consumption, complex operation, high requirements on the cleanliness of the input air, strict requirements on the degree of purification, and unstable gas supply.

[0004] Therefore, in the related art, there is a technical problem that there is no suitable stable air supply device for 3D printing in the prior art.

[0005] To address the above-mentioned problems, no effective solutions have been proposed so far.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a 3D printing system and method to at least solve the technical problem that there is no suitable stable air supply device for 3D printing.

[0008] According to one aspect of an embodiment of the present application, a 3D printing system is provided, comprising: a 3D printer, a controller, and a gas separation device, wherein the controller communicates with the 3D printer and is used to control the 3D printer to perform 3D printing; the controller also communicates with the gas separation device and is used to generate control instructions according to a preconfigured control strategy and send them to the gas separation device; the gas separation device is used to separate a first target gas from air received from the outside based on the received control instructions, and deliver the first target gas to the 3D printer.

[0009] Optionally, the control strategy is configured to: generate and send a first control instruction to the gas separation device in response to a start-up operation or a timed start-up operation triggered by a user; wherein the first control instruction includes starting the operation of delivering a first target gas; and generate and send a second control instruction to the gas separation device in response to a shutdown operation or a timed shutdown operation triggered by a user; wherein the second control instruction includes stopping the operation of delivering the first target gas.

[0010] Optionally, the control strategy is configured as follows: when it is detected that the 3D printer enters the working state, a first control instruction is generated and sent to the gas separation device; wherein, the first control instruction includes starting the operation of delivering the first target gas; when it is detected that the 3D printer exits the working state, a second control instruction is generated and sent to the gas separation device; wherein, the second control instruction includes stopping the operation of delivering the first target gas.

[0011] Optionally, the control strategy is configured as follows: when one or more of the following is detected: the 3D printer is turned on, the light source of the 3D printer starts to expose, the forming platform of the 3D printer moves for the nth time, a print task start instruction is received, or the printing material of the 3D printer reaches a preset position, the 3D printer is determined to enter a working state; when one or more of the following is detected: the 3D printer is turned off, the light source of the 3D printer stops exposing, the forming platform of the 3D printer moves for the mth time, a print task stop instruction is received, or the printing material of the 3D printer is lower than a preset position, the 3D printer is determined to exit a working state; wherein m and n are integers, and m is greater than n.

[0012] Optionally, the control strategy is configured to: generate and send a third control instruction when it is detected that the release film of the 3D printer is higher than a preset calibration position, the pressure of the first target gas in the 3D printer is higher than a preset pressure range, the airflow of the first target gas in the 3D printer is higher than a preset range, the concentration of the first target gas in the 3D printer is higher than a preset concentration range, and the bearing force of the lower surface of the release film of the 3D printer is greater than the bearing force of the upper surface; wherein the third control instruction includes controlling the gas delivered by the gas separation device to reduce; and generate and send a fourth control instruction when it is detected that the release film of the 3D printer is lower than a preset calibration position, the pressure of the first target gas in the 3D printer is lower than a preset pressure range, the airflow of the first target gas in the 3D printer is lower than a preset range, the concentration of the first target gas in the 3D printer is lower than a preset concentration range, and the bearing force of the upper surface of the release film of the 3D printer is less than the bearing force of the lower surface; wherein the fourth control instruction includes controlling the gas delivered by the gas separation device to increase.

[0013] Optionally, the gas separation device is built into the 3D printer or is independently provided apart from the 3D printer.

[0014] Optionally, the gas separation device includes: an air receiving device, a gas separation module, and a first target gas output module, wherein the air receiving device is used to receive and respond to a control instruction from the controller, wherein when the air receiving device receives the first control instruction, it starts to receive air from the outside, and when the air receiving device receives the second control instruction, it stops receiving air from the outside; the gas separation module is used to separate the air to obtain a first target gas and transport it to the first target gas output module; the first target gas output module is used to output the first target gas to the 3D printer when the first target gas is received.

[0015] Optionally, a pressure difference unit is provided on the first target gas output module, and the pressure difference unit is used to detect the pressure of the first target gas and send it to the controller.

[0016] Optionally, a gas concentration sensor is provided on the first target gas output module, and the gas concentration sensor is used to detect the concentration of the first target gas and send it to the controller.

[0017] Optionally, the 3D printer includes a material tray and a release film and an inflation cavity provided at the bottom of the material tray. The release film is provided above the inflation cavity. The inflation cavity is used to accommodate the first target gas. A position sensor is provided on the material tray. The position sensor is used to detect the position data of the release film and send it to the controller.

[0018] Optionally, the gas separation device includes one or more of a nitrogen adsorption module and a nitrogen separation module.

[0019] Optionally, the first target gas includes oxygen-rich gas, and the gas separation module includes a nitrogen adsorption module; the nitrogen adsorption module is connected to the first target gas output module, and the nitrogen adsorption module is used to transport the remaining gas after nitrogen adsorption to the first target gas output module.

[0020] Optionally, an oxygen-rich gas outlet is provided on the nitrogen adsorption module, wherein the nitrogen adsorption module is used to release the high-pressure adsorbed nitrogen after discharging the remaining gas after nitrogen adsorption through the oxygen-rich gas outlet, and to perform the next nitrogen adsorption after mixing the released gas with the air received from the outside.

[0021] Optionally, the nitrogen adsorption module includes a separation valve and a molecular sieve tower, wherein the separation valve is used to control the gas flow route within the nitrogen adsorption module, wherein the separation valve is provided with an air inlet for receiving air, an air vent for air flowing to the molecular sieve tower, and an exhaust port for removing residual gas; the molecular sieve tower is used to perform high-pressure adsorption of nitrogen in the air, obtain residual gas after high-pressure adsorption, and release the high-pressure adsorbed nitrogen.

[0022] Optionally, the gas separation device further includes: a flow limiting ring, wherein the flow limiting ring is used to limit the flow rate of the first target gas when it is discharged from the oxygen-rich gas outlet.

[0023] Optionally, at least two molecular sieve towers are provided, and the vent of the separation valve is used to switch between the at least two molecular sieve towers.

[0024] Optionally, the molecular sieve tower includes a first molecular sieve tower and a second molecular sieve tower, and the vent of the separation valve includes a first vent and a second vent, the first vent is connected to the first molecular sieve tower, and the second vent is connected to the second molecular sieve tower.

[0025] Optionally, in the first state, the separation valve controls the air inlet and the first air vent to be connected, and the second air vent to be connected to the exhaust port; in the second state, the separation valve controls the air inlet and the second air vent to be connected, and the first air vent to be connected to the exhaust port; wherein the separation valve cyclically switches between the first state and the second state according to a predetermined period.

[0026] Optionally, when the first molecular sieve tower performs high-pressure adsorption on nitrogen in the air, the second molecular sieve tower performs equal pressure on the first molecular sieve tower, prompting the first molecular sieve tower to reduce pressure and release the nitrogen adsorbed at high pressure; when the second molecular sieve tower performs high-pressure adsorption on nitrogen in the air, the first molecular sieve tower performs equal pressure on the second molecular sieve tower, prompting the second molecular sieve tower to reduce pressure and release the nitrogen adsorbed at high pressure.

[0027] Optionally, the gas separation device further includes a regulating component, which is used to limit the flow rate and / or direction of the first target gas when it is delivered to the first target gas output module.

[0028] Optionally, the regulating component includes one or more of a flow limiting ring, a speed regulating valve, a pressure regulating valve, a one-way valve, and a flow limiting valve.

[0029] Optionally, a speed regulating valve and / or a one-way valve is provided in the air receiving device.

[0030] Optionally, the gas separation device also includes: a filter, an oil-free air compressor and a cooling unit, wherein the filter is used to filter dust and water vapor in the air to obtain filtered air; the oil-free air compressor is used to increase the gas pressure of the filtered air and increase the gas flow rate of the filtered air to obtain compressed air; the cooling unit is used to cool the compressed air to obtain treated air.

[0031] Optionally, the system further includes: a residual gas reflux channel, and a low-oxygen gas output device, wherein the gas separation device is further used to separate oxygen from the external air and / or the second target gas refluxed in the residual gas reflux channel to obtain a third target gas; the residual gas reflux channel is used to reflux the second target gas to the air receiving device; and the low-oxygen gas output device is used to output the third target gas upon receiving the third target gas.

[0032] Optionally, the gas separation device is provided with a first gas outlet and a second gas outlet, and the second target gas is discharged through the first gas outlet and flows to the air pretreatment device through the residual gas reflux channel.

[0033] Optionally, the first target gas output module is used to receive and output the first target gas separated in the gas separation device and discharged from the second gas outlet.

[0034] Optionally, the first target gas output module is provided with a speed regulating valve for opening an oxygen-rich gas output channel.

[0035] Optionally, an oxygen concentration sensor is provided on the first target gas output module, and the oxygen concentration sensor is used to detect the oxygen concentration of the received first target gas.

[0036] Optionally, the first target gas output module is provided with a one-way valve for controlling the flow direction of air.

[0037] Optionally, the pressure difference unit is further used to control the opening of the speed regulating valve on the first target gas output module based on the pressure of the first target gas.

[0038] Optionally, the gas separation device is used to perform high-pressure adsorption on the nitrogen in the air received in the air receiving device, and discharge the first target gas remaining after the high-pressure adsorption from the second gas outlet; and after the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain the second target gas, so that the second target gas can flow back to the gas separation device through the residual gas reflux channel for circulation treatment.

[0039] Optionally, the hypoxic gas output device is provided with a speed regulating valve for opening the hypoxic gas output channel.

[0040] Optionally, the hypoxic gas output device is provided with an oxygen concentration sensor, and the oxygen concentration sensor is used to detect the oxygen concentration of the received third target gas.

[0041] Optionally, the hypoxic gas output device is provided with a one-way valve for controlling the flow direction of air.

[0042] Optionally, the air receiving device is provided with a speed regulating valve for adjusting the air inflow speed and / or a one-way valve for controlling the air flow direction.

[0043] Optionally, a switch valve is provided on the residual gas reflux channel, wherein the switch valve is used to open the residual gas reflux channel.

[0044] According to another aspect of an embodiment of the present application, a 3D printing method is also provided, which is executed by a controller, including: generating a control instruction according to a pre-configured control strategy and sending it to a gas separation device, so that the gas separation device separates a first target gas from the air received from the outside based on the received control instruction and delivers it to the 3D printer.

[0045] Optionally, the gas separation device separates a first target gas from the air received from the outside based on the received control instruction to deliver it to the 3D printer, including: using an air receiving device to receive outside air, and conducting the received air to an air pretreatment device; using the air pretreatment device to process the air received by the air receiving device to obtain treated air, and conducting the treated air to the gas separation device; using the gas separation device to perform high-pressure adsorption on the nitrogen in the treated air, and discharging the remaining part of the first target gas after the high-pressure adsorption from the second air outlet to deliver it to the 3D printer.

[0046] Optionally, when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, the method further includes: when an oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration, opening the speed regulating valve on the first target gas output module to output the first target gas.

[0047] Optionally, the method further includes: adjusting the opening of the speed control valve on the air receiving device and the speed control valve on the first target gas output module according to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the first target gas output module.

[0048] Optionally, when a pressure differential unit is provided on the first target gas output module, the method further includes: detecting the air pressure of the first target gas based on the pressure differential unit, and using the pressure differential unit to control the speed control valve on the first target gas output module and the opening of the speed control valve on the air receiving device based on the air pressure of the first target gas.

[0049] Optionally, the first target gas is used to supply oxygen for a 3D printing process.

[0050] Optionally, the method further includes: after discharging part of the first target gas, releasing the high-pressure adsorbed nitrogen to obtain a second target gas; using a residual gas reflux channel to return the second target gas to the air pretreatment device, and circulating it in combination with the air received from the air receiving device; using an oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel to detect the oxygen concentration in the second target gas after circulation treatment; when the oxygen concentration sensor detects that the current oxygen concentration is the target oxygen concentration, obtaining a third target gas, and opening the speed control valve on the low-oxygen gas output device to output the third target gas.

[0051] Optionally, the method further includes: adjusting the opening of the speed regulating valve on the air receiving device and the speed regulating valve on the hypoxic gas output device according to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device.

[0052] Optionally, the method also includes: when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed control valve is provided on the first target gas output module, adjusting the opening of the speed control valve on the first target gas output module according to the current concentration and target oxygen concentration detected by the oxygen concentration sensor on the low oxygen gas output device.

[0053] Optionally, the third target gas is used as a curing protection gas in post-processing of 3D printing.

[0054] According to another aspect of the present application, a gas supply assembly is provided, comprising: an air receiving device, a gas separation device, a residual gas reflux channel, and a low-oxygen gas output device, wherein the air receiving device is used to receive external air; the gas separation device is used to separate oxygen from the external air and / or the second target gas flowing back in the residual gas reflux channel to obtain a third target gas; the residual gas reflux channel is used to return the second target gas to the air receiving device; and the low-oxygen gas output device is used to output the third target gas when receiving the third target gas.

[0055] Optionally, an air pre-treatment device is further included, the air outlet of the air receiving device is communicated with the air inlet of the air pre-treatment device, and the air outlet of the air pre-treatment device is communicated with the air inlet of the gas separation device.

[0056] Optionally, the air pretreatment device includes: a filter, an air compressor and a cooling unit, wherein the filter is used to remove dust and water vapor in the air received by the air receiving device to obtain filtered air; the air compressor is used to increase the gas pressure of the filtered air and increase the gas flow rate of the filtered air to obtain compressed air; and the cooling unit is used to cool the compressed air to obtain the treated air.

[0057] Optionally, the gas separation device is provided with a first gas outlet and a second gas outlet, and the second target gas is discharged through the first gas outlet and flows to the air pretreatment device through the residual gas reflux channel.

[0058] Optionally, a first target gas output module is further included, which is used to receive and output the first target gas separated by the gas separation device and discharged from the second gas outlet.

[0059] Optionally, the first target gas output module is provided with a speed regulating valve for opening an oxygen-rich gas output channel.

[0060] Optionally, an oxygen concentration sensor is provided on the first target gas output module, and the oxygen concentration sensor is used to detect the oxygen concentration of the received first target gas.

[0061] Optionally, the first target gas output module is provided with a one-way valve for controlling the flow direction of air.

[0062] Optionally, a pressure difference unit is provided on the first target gas output module, and the pressure difference unit is used to detect the pressure of the first target gas and control the opening of the speed control valve on the first target gas output module based on the pressure of the first target gas.

[0063] Optionally, the gas separation device is used to perform high-pressure adsorption on the nitrogen in the air received in the air receiving device, and discharge the first target gas remaining after the high-pressure adsorption from the second gas outlet; and after the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain the second target gas, so that the second target gas can flow back to the gas separation device through the residual gas reflux channel for circulation treatment.

[0064] Optionally, the gas separation device includes: a separation valve, a molecular sieve tower and a flow limiting ring, wherein the separation valve is used to control the gas flow route within the gas separation device, wherein the separation valve is provided with an air inlet for receiving the treated air, an air vent for the treated air to flow to the molecular sieve tower, and an exhaust port for discharging the residual gas; the molecular sieve tower is used to perform high-pressure adsorption on the nitrogen in the treated air, and after the first target gas remaining after the high-pressure adsorption is discharged from the second gas outlet, the high-pressure adsorbed nitrogen is released to obtain the second target gas; the flow limiting ring is used to limit the flow rate of the first target gas when it is discharged from the second gas outlet.

[0065] Optionally, when the molecular sieve tower includes a first molecular sieve tower and a second molecular sieve tower, and the vent of the separation valve includes a first vent and a second vent, the first vent is connected to the first molecular sieve tower, and the second vent is connected to the second molecular sieve tower.

[0066] Optionally, in the first state, the separation valve controls the air inlet and the first air vent to be connected, and the second air vent to be connected to the exhaust port; in the second state, the separation valve controls the air inlet and the second air vent to be connected, and the first vent to be connected to the exhaust port; the separation valve cyclically switches between the first state and the second state according to a predetermined period.

[0067] Optionally, the first molecular sieve tower and the second molecular sieve tower are connected through the limiting ring.

[0068] Optionally, when the first molecular sieve tower performs high-pressure adsorption on the nitrogen in the treated air, the second molecular sieve tower performs equal pressure on the first molecular sieve tower, prompting the first molecular sieve tower to reduce pressure and release the high-pressure adsorbed nitrogen; when the second molecular sieve tower performs high-pressure adsorption on the nitrogen in the treated air, the first molecular sieve tower performs equal pressure on the second molecular sieve tower, prompting the second molecular sieve tower to reduce pressure and release the high-pressure adsorbed nitrogen.

[0069] Optionally, the hypoxic gas output device is provided with a speed regulating valve for opening the hypoxic gas output channel.

[0070] Optionally, the hypoxic gas output device is provided with an oxygen concentration sensor, and the oxygen concentration sensor is used to detect the oxygen concentration of the received third target gas.

[0071] Optionally, the hypoxic gas output device is provided with a one-way valve for controlling the flow direction of air.

[0072] Optionally, the air receiving device is provided with a speed regulating valve for adjusting the air inflow speed and / or a one-way valve for controlling the air flow direction.

[0073] Optionally, a switch valve is provided on the residual gas reflux channel, wherein the switch valve is used to open the residual gas reflux channel.

[0074] According to another aspect of the present application, a gas preparation method is provided, comprising: receiving outside air using an air receiving device and conducting the received air to an air pretreatment device; processing the air received by the air receiving device using the air pretreatment device to obtain treated air, and conducting the treated air to a gas separation device; performing high-pressure adsorption on nitrogen in the treated air using the gas separation device, and discharging a portion of a first target gas remaining after the high-pressure adsorption from a second gas outlet, and after discharging the portion of the first target gas, releasing the high-pressure adsorbed nitrogen to obtain a second target gas; returning the second target gas to the air pretreatment device using a residual gas reflux channel, and performing a circulated treatment in combination with the air received from the air receiving device; detecting the oxygen concentration in the second target gas after the circulated treatment using an oxygen concentration sensor on a hypoxic gas output device connected to the residual gas reflux channel; obtaining a third target gas when the oxygen concentration sensor detects that the current oxygen concentration is the target oxygen concentration, and opening a speed regulating valve on the hypoxic gas output device to output the third target gas.

[0075] Optionally, the method further includes: adjusting the opening of the speed regulating valve on the air receiving device and the speed regulating valve on the hypoxic gas output device according to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device.

[0076] Optionally, the method also includes: when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed control valve is provided on the first target gas output module, adjusting the opening of the speed control valve on the first target gas output module according to the current concentration and target oxygen concentration detected by the oxygen concentration sensor on the low oxygen gas output device.

[0077] Optionally, the third target gas is used as a curing protection gas in post-processing of 3D printing.

[0078] According to another aspect of the present application, a gas preparation method is provided, comprising: using an air receiving device to receive external air, and conducting the received air to an air pretreatment device; using the air pretreatment device to process the air received by the air receiving device to obtain treated air, and conducting the treated air to a gas separation device; using the gas separation device to perform high-pressure adsorption on nitrogen in the treated air, and discharging the remaining portion of the first target gas after the high-pressure adsorption from a second gas outlet.

[0079] Optionally, when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, the method further includes: when an oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration, opening the speed regulating valve on the first target gas output module to output the first target gas.

[0080] Optionally, the method further includes: adjusting the opening of the speed control valve on the air receiving device and the speed control valve on the first target gas output module according to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the first target gas output module.

[0081] Optionally, when a pressure differential unit is provided on the first target gas output module, the method further includes: detecting the air pressure of the first target gas based on the pressure differential unit, and using the pressure differential unit to control the speed control valve on the first target gas output module and the opening of the speed control valve on the air receiving device based on the air pressure of the first target gas.

[0082] Optionally, the first target gas is used to supply oxygen for a 3D printing process.

[0083] According to another aspect of the present application, a gas preparation method is provided, comprising: receiving outside air using an air receiving device and conducting the received air to an air pretreatment device; processing the air received by the air receiving device using the air pretreatment device to obtain treated air, and conducting the treated air to a gas separation device; performing high-pressure adsorption on nitrogen in the treated air using the gas separation device, and discharging a portion of a first target gas remaining after the high-pressure adsorption from a second gas outlet, and after discharging the portion of the first target gas, releasing the high-pressure adsorbed nitrogen to obtain a second target gas; returning the second target gas to the air pretreatment device using a residual gas reflux channel for circulation treatment in combination with the air received from the air receiving device; detecting the oxygen concentration of the second target gas after the circulation treatment using an oxygen concentration sensor on a hypoxic gas output device connected to the residual gas reflux channel; obtaining a third target gas when the oxygen concentration sensor on the hypoxic gas output device detects that the current oxygen concentration is the hypoxic gas target oxygen concentration, and opening a speed regulating valve on the hypoxic gas output device to output the third target gas.

[0084] Optionally, when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, the method further includes: when the oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration of oxygen-rich gas, opening the speed regulating valve on the first target gas output module to output the first target gas.

[0085] Optionally, the method further includes: adjusting the opening of a speed regulating valve on the hypoxic gas output device according to a current oxygen concentration detected by an oxygen concentration sensor on the hypoxic gas output device and a target oxygen concentration of the hypoxic gas.

[0086] Optionally, the method further includes: adjusting the opening of the speed control valve on the first target gas output module according to the current oxygen concentration detected by the oxygen concentration sensor on the first target gas output module and the target oxygen concentration of the oxygen-rich gas.

[0087] Optionally, when a pressure differential unit is provided on the first target gas output module, the method further includes: detecting the gas pressure of the first target gas based on the pressure differential unit, and using the pressure differential unit to control the opening of the speed control valve on the first target gas output module based on the gas pressure of the first target gas.

[0088] Optionally, the third target gas is used as a curing protection gas for post-processing of 3D printing, and the first target gas is used to supply oxygen for the printing process of the 3D printing.

[0089] In an embodiment of the present application, a controller is used to communicate with a 3D printer and a gas separation device. On the one hand, the controller can communicate with the 3D printer to enable it to perform 3D printing. On the other hand, the controller can communicate with the gas separation device to enable it to separate a first target gas from the air received from the outside according to the received control instructions, and deliver the first target gas to the 3D printer to help the 3D printer achieve better printing effects, thereby solving the technical problem that there is no stable gas supply device suitable for 3D printing.

[0090] In addition, in the embodiment of the present application, based on the air receiving device, the air pretreatment device, the gas separation device, the residual gas reflux channel, the low-oxygen gas output device, and the connection relationship between the various devices, the air supply component can receive air from the outside, and after processing the air, the gas separation device is used to adsorb the nitrogen in the treated air, and the treated air is divided into a first target gas with a higher oxygen concentration, and a second target gas with a lower oxygen concentration, and the second target gas is returned to the air pretreatment device through the residual gas reflux channel, and is subjected to a cyclic treatment process such as air treatment and high-pressure nitrogen adsorption together with the air received from the outside by the air receiving device. In this process, the gas separation device in the air supply component will continuously adsorb nitrogen on the gas flowing into it, that is, after multiple cycles of treatment, it can be obtained. The first target gas with higher oxygen concentration and the second target gas with lower oxygen concentration are received, and the second target gas will flow to the low-oxygen gas output device. When the second target gas received by the low-oxygen gas output device becomes the third target gas, the speed regulating valve can be opened to output the low-oxygen gas, thereby achieving the purpose of using the gas supply component to prepare the third target gas with higher nitrogen concentration and the first target gas with higher oxygen concentration. Moreover, the gas supply component has no consumables during its service life cycle and does not require part replacement. The overall size of the component is relatively small, and it is more convenient to use. By adjusting the opening of each speed regulating valve in the gas supply component, the flow rate and concentration of the third target gas and the first target gas can also be accurately controlled, thereby achieving the technical effect of stable gas supply, thereby solving the technical problem that there is no stable gas supply device suitable for 3D printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0092] FIG1 is a schematic diagram of a 3D printing system according to an embodiment of the present application;

[0093] FIG2 is a first schematic diagram of a 3D printing system provided according to an optional embodiment of the present application;

[0094] FIG3 is a second schematic diagram of a 3D printing system provided according to an optional embodiment of the present application;

[0095] FIG4 is a flow chart of a 3D printing method according to an embodiment of the present application;

[0096] FIG5 is a schematic diagram of an air supply assembly according to an embodiment of the present application;

[0097] FIG6 is a flow chart of a gas preparation method 1 provided according to an embodiment of the present application;

[0098] FIG7 is a flow chart of a second gas preparation method according to an embodiment of the present application;

[0099] FIG8 is a flow chart of a gas preparation method 3 provided according to an embodiment of the present application;

[0100] FIG9 is a schematic diagram of an air supply assembly provided according to an optional embodiment of the present application;

[0101] FIG10 is a schematic diagram of an oxygen-enriched gas preparation component according to an optional embodiment of the present application;

[0102] FIG11 is a schematic diagram of air pressure feedback control provided according to an optional embodiment of the present application;

[0103] FIG12 is a schematic diagram showing a comparison of curing efficiency between a 3D printing curing process assisted by an air supply assembly and a traditional curing method according to an optional embodiment of the present application. DETAILED DESCRIPTION

[0104] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0105] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0106] In DLP (Dry Lithium-ion) 3D printing, the print surface is located between a tray and a build platform. The light-curing resin receives UV light projected from a specific pattern from the bottom, causing a cross-linking reaction and curing. The cured resin adheres to the build platform and the tray. To cure the next layer, the build platform is raised to separate the cured resin from the tray. Once separated, the build platform is lowered to a distance equal to the thickness of the layer above the tray, where UV light is applied again to cure the part. This process repeats to complete the 3D printing process. During this process, an adhesive force forms between the tray and the cured resin. This force must be overcome during peeling to separate the resin from the tray. The greater the adhesive force, the lower the 3D printing efficiency. To reduce this peeling force, an oxygen-rich zone can be created between the resin and the tray. Due to oxygen inhibition, the resin between the cured resin and the tray will not cure, thus reducing the adhesive force and improving 3D printing efficiency. As mentioned above, an oxygen-rich zone is necessary to reduce adhesive force, so an oxygen supply is required for the 3D printer.

[0107] Currently, the more mature methods of producing oxygen from air include cryogenic distillation, membrane separation, and pressure swing adsorption.

[0108] Cryogenic distillation liquefies air through compression and cooling. Utilizing the different boiling points of oxygen and nitrogen, continuous gas-liquid contact and heat exchange occur in a distillation tower, separating the high-boiling-point oxygen from the low-boiling-point nitrogen. This method requires high production volume, requires significant investment, consumes a lot of energy, and is complex to operate. It is only suitable for large-scale oxygen production and is not suitable for 3D printing.

[0109] Membrane separation generates gas pressure at both ends of a membrane. Driven by this pressure, the separation is achieved by exploiting the differences in the adsorption capacity of individual elements on the polymer membrane surface and their dissolution and diffusion within the membrane. While the membrane separation process is simple, easy to operate, and highly reliable, it can only achieve an oxygen concentration of 40-50%. Furthermore, the membranes are expensive and require high levels of cleanliness and purification of the input air, making it unsuitable for 3D printing.

[0110] PSA (Pressure Swing Adsorption) separates oxygen and nitrogen from the air by selectively adsorbing them with molecular sieves. This separation is achieved by taking advantage of the molecular sieve's greater adsorption capacity for nitrogen than for oxygen. This method quickly and conveniently generates oxygen, offering low cost, simple operation, simple equipment, high reliability, and a compact size. It can achieve oxygen concentrations up to 95%, making it ideal for oxygen enrichment equipment in 3D printing.

[0111] The PSA oxygen generation method is used in oxygen concentrators in the medical industry to provide high-concentration oxygen for patients to breathe. However, the PSA oxygen generation system architecture and overall solution used in the 3D printing industry differ from those in the medical industry. Traditional medical oxygen concentrators are based on human needs and are characterized by high oxygen output, uncontrollable oxygen flow and pressure, and the addition of humidification or atomization functions to meet human oxygen needs. These devices are large and costly. Oxygen concentrators used in 3D printing require stable oxygen output, controllable airflow and pressure, high oxygen concentration, and low airflow. Traditional home PSA oxygen concentrators, because users rarely use them, do not dry the gas inlet. Undried gas entering the molecular sieve prematurely reduces the life of the molecular sieve and makes it impossible to maintain oxygen concentration.

[0112] In response to the above problems, an embodiment of the present application provides an embodiment of a 3D printing system. Figure 1 is a schematic diagram of a 3D printing system provided according to an embodiment of the present application. As shown in Figure 1, the system includes: a 3D printer, a controller and a gas separation device, wherein the controller communicates with the 3D printer and is used to control the 3D printer to perform 3D printing; the controller also communicates with the gas separation device and is used to generate control instructions according to a pre-configured control strategy and send them to the gas separation device; the gas separation device is used to separate the first target gas from the air received from the outside based on the received control instructions, and deliver it to the 3D printer.

[0113] The embodiment of the present application adopts a method in which the controller communicates with the 3D printer and the gas separation device. On the one hand, the controller can communicate with the 3D printer to enable it to perform 3D printing. On the other hand, the controller can communicate with the gas separation device to enable it to separate the first target gas from the air received from the outside according to the received control instructions, and deliver the first target gas to the 3D printer to help the 3D printer achieve better printing effects, thereby solving the technical problem that there is no stable gas supply device suitable for 3D printing.

[0114] It should be noted that the above-mentioned controller can be a built-in controller of a 3D printer, a controller on a gas separation device, or an independent controller.

[0115] The controller in the embodiments of the present application can generate control instructions based on a preconfigured control strategy. The control instructions generated by the controller can be used to control the gas separation device to start or stop delivering the first target gas. Controlling the gas separation device to start or stop delivering the first target gas can be performed at any desired time, as illustrated below by an example.

[0116] For example, the control strategy can be configured as follows: in response to a user-triggered start-up operation or a timed start-up operation, a first control instruction is generated and sent to the gas separation device; wherein the first control instruction includes starting the delivery of the first target gas; in response to a user-triggered shutdown operation or a timed shutdown operation, a second control instruction is generated and sent to the gas separation device; wherein the second control instruction includes stopping the delivery of the first target gas. Through the above-mentioned user-triggered operation (wherein the operation can be real-time or timed), the start or stop of the input of the first target gas to the gas separation device can be controlled based on the needs of the user. By adopting the above-mentioned processing, it is possible to effectively realize flexible control of the use and disabling of the first target gas based on the needs of the user.

[0117] For another example, the control strategy can also be configured as follows: upon detecting that the 3D printer has entered an operating state, a first control instruction is generated and sent to the gas separation device; wherein the first control instruction includes starting the operation of delivering the first target gas; upon detecting that the 3D printer has exited an operating state, a second control instruction is generated and sent to the gas separation device; wherein the second control instruction includes stopping the operation of delivering the first target gas. Through the above processing, the input of the first target gas to the gas separation device is started or stopped based on the operating state of the 3D printer, so that whether to input the first target gas to the gas separation device is triggered by the operating state of the 3D printer, starting the operation of delivering the first target gas when the 3D printer enters an operating state, and stopping the operation of delivering the first target gas when the 3D printer exits an operating state, thereby realizing intelligent control of the delivery of the first target gas based on the state of the 3D printer.

[0118] Whether the 3D printer enters or exits the working state can be determined based on the individual components or the entire state of the 3D printer. For example, the 3D printer is determined to be in the working state when one or more of the following is detected: the 3D printer is turned on, the light source of the 3D printer begins exposure, the build platform of the 3D printer descends for the nth time, a print task start instruction is received, or the printing material of the 3D printer reaches a preset position. This indicates that the 3D printer needs to start 3D printing at this time, and the gas separation device needs to output the first target gas to the 3D printer to form an oxygen-rich area between the resin and the material tray. Therefore, the control strategy at this time is to generate a first control instruction, and this first control instruction is used to start the operation of delivering the first target gas. The 3D printer is determined to have exited the working state when one or more of the following is detected: the 3D printer is turned off, the light source of the 3D printer stops exposure, the build platform of the 3D printer descends for the mth time (where m and n are integers and m is greater than n), a print task stop instruction is received, or the printing material of the 3D printer falls below the preset position. This indicates that the 3D printer has finished 3D printing and the gas separation device no longer needs to continue outputting the first target gas to the 3D printer. Therefore, the control strategy at this time is to generate a second control instruction, and the second control instruction is used to stop the operation of delivering the first target gas.

[0119] It should be noted that the above-mentioned 3D printer is turned on, the light source starts to expose, the molding platform is lowered, the printing task starts, and the position of the printing material can all be determined based on the corresponding detection equipment or the corresponding operation instructions received. For example, turning on the machine, exposing, lowering, and starting the printing task may all involve corresponding instructions, and the corresponding operations can be determined based on the corresponding instructions. The liquid level detection can be obtained based on sensor detection. For example, when the liquid level sensor detects that the liquid level has reached a preset position, it determines that printing can be started, that is, entering the working state. In addition, it should be pointed out that the above-mentioned various judgment objects can be judged based on one of them, and of course they can also be judged based on a combination of multiple ones, depending on the specific judgment accuracy requirements.

[0120] The controller in the embodiment of the present application generates control instructions based on a pre-configured control strategy, which can also be used to control the gas separation device to increase or decrease the delivery of the first target gas. For example, the above control strategy can be configured as follows: when it is detected that the release film of the 3D printer is higher than a preset calibration position, the pressure of the first target gas in the 3D printer is higher than a preset pressure range, the airflow of the first target gas in the 3D printer is higher than a preset range, the concentration of the first target gas in the 3D printer is higher than a preset concentration range, or the bearing force of the lower surface of the release film of the 3D printer is greater than the bearing force of the upper surface, it indicates that the gas separation device has delivered too much first target gas to the 3D printer and needs to adjust the pressure and oxygen concentration of the first target gas formed in the 3D printer. Therefore, the control strategy at this time is to generate a third control instruction, and the third control instruction is used to reduce the delivery of the first target gas. When it is detected that the release film of the 3D printer is lower than the preset calibration position, the pressure of the first target gas in the 3D printer is lower than the preset pressure range, the airflow of the first target gas in the 3D printer is lower than the preset range, the concentration of the first target gas in the 3D printer is lower than the preset concentration range, and the bearing capacity of the upper surface of the release film of the 3D printer is less than the bearing capacity of the lower surface, it means that the gas separation device has delivered too little first target gas to the 3D printer, which may affect the curing effect of the resin material and make it difficult to peel it from the material tray. It is necessary to adjust the pressure and oxygen concentration of the first target gas formed in the 3D printer. Therefore, the control strategy at this time is to generate a fourth control instruction, and the fourth control instruction is used to increase the delivery of the first target gas.

[0121] It should be noted that the height of the release film, the gas pressure, airflow, concentration, and the bearing capacity of the lower surface of the release film can all be directly collected based on the corresponding sensors, or they can be obtained after 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 of a 3D printer, the volume of the printed material can be detected and converted into weight to determine the bearing capacity of the release film surface; by setting a weighing sensor at the bottom of the material tray and detecting the total weight of the material tray and the printed material, the bearing capacity of the release film surface can be determined. That is, the balance of the action and reaction forces on the upper and lower surfaces of the film. In addition, since the upper projection technology does not require the installation of a film or the passage of oxygen, the upper projection is not considered here, so the upper surface and small surface are used for description.

[0122] As an optional embodiment, the gas separation device is built into the 3D printer or independently installed from the 3D printer. The installation location of the gas separation device can be selected based on the actual application and can be built into the 3D printer, independently installed from the 3D printer, built into the 3D printer but detachable, etc.

[0123] As an optional embodiment, the gas separation device includes: an air receiving device, a gas separation module, and a first target gas output module, wherein the air receiving device is used to receive and respond to control instructions from the controller, wherein when the air receiving device receives the first control instruction, it starts to receive air from the outside, and when the air receiving device receives the second control instruction, it stops receiving air from the outside; the gas separation module is used to separate the air to obtain a first target gas and transport it to the first target gas output module; the first target gas output module is used to output the first target gas to a 3D printer when receiving the first target gas.

[0124] When the air receiving device receives the first control instruction from the controller, it means that the gas separation device is needed to prepare the first target gas at this time. The air receiving device responds to the first control instruction and starts to receive air from the outside. The air can obtain the first target gas by passing through the gas separation device as raw gas. When the air receiving device receives the second control instruction from the controller, it means that the gas separation device is no longer needed to prepare the first target gas at this time. The air receiving device responds to the second control instruction and stops receiving air from the outside. Similarly, when the air receiving device receives the third control instruction, it means that the delivery of the first target gas needs to be reduced at this time, which can also be achieved by controlling the air receiving device to reduce the amount of air received from the outside. When the air receiving device receives the fourth control instruction, it means that the delivery of the first target gas needs to be increased at this time, which can also be achieved by controlling the air receiving device to increase the amount of air received from the outside.

[0125] The gas separation module receives air from the air receiving module and separates the air according to its gas components. For example, nitrogen, oxygen, etc. can be separated from the air to obtain the first target gas. The first target gas can be accurately delivered to the 3D printer through the first target gas output module to form an oxygen-rich area between the curing resin and the material tray to assist 3D printing.

[0126] As an optional embodiment, the first target gas output module is provided with a pressure differential unit for detecting the pressure of the first target gas and transmitting it to the controller. The pressure differential unit on the first target gas output module can monitor the pressure of the first target gas during output, and transmit the pressure monitoring result to the controller. The controller can then obtain a pre-set pressure value and, in combination with the monitored output pressure of the first target gas, control the opening of the speed regulating valve on the first target gas output module to achieve the desired output pressure of the first target gas.

[0127] As an optional embodiment, the first target gas output module is provided with a gas concentration sensor for detecting the concentration of the first target gas and transmitting the result to the controller. By providing the gas concentration sensor on the first target gas output module, the gas concentration of the first target gas during output can be monitored, for example, the oxygen concentration of the first target gas. The gas concentration monitoring result can be transmitted to the controller. The controller can then obtain a set gas concentration value and, in combination with the detected gas concentration of the first target gas, control the opening of the speed control valve on the first target gas output module to achieve the desired first target gas concentration.

[0128] As an optional embodiment, the 3D printer includes a material tray and a release film and an inflation cavity arranged at the bottom of the material tray. The release film is arranged above the inflation cavity. The inflation cavity is used to accommodate the first target gas. A position sensor is provided on the material tray. The position sensor is used to detect the position data of the release film and send it to the controller.

[0129] The first target gas output module delivers the first target gas to the inflation chamber, and the inflation chamber uses the first target gas in the chamber to form an oxygen-rich area near the release film. The position sensor provided on the material tray can be used to detect the position of the release film and send the position data of the release film to the controller. The controller can determine whether the position of the release film is higher than the preset calibration position based on the position data. If so, the controller can send a third control instruction to the gas separation device to reduce the first target gas delivered by the gas separation device. If not, the controller can send a fourth control instruction to the gas separation device to increase the first target gas delivered by the gas separation device.

[0130] As an optional embodiment, the gas separation device includes one or more of a nitrogen adsorption module and a nitrogen separation module. When performing gas separation on the air from the air receiving device, the gas separation device can adsorb and / or separate nitrogen in the air through the nitrogen adsorption module and / or the nitrogen separation module to increase the proportion of oxygen in the remaining gas, thereby obtaining an oxygen-enriched first target gas.

[0131] As an optional embodiment, the first target gas includes oxygen-rich gas, and the gas separation module includes a nitrogen adsorption module; the nitrogen adsorption module is connected to the first target gas output module, and the nitrogen adsorption module is used to transport the remaining gas after nitrogen adsorption to the first target gas output module.

[0132] As an optional embodiment, the first target gas includes nitrogen-rich gas, and the gas separation module includes a nitrogen adsorption module; the nitrogen adsorption module is provided with an oxygen-rich gas outlet, and the nitrogen adsorption module is connected to the first target gas output module, wherein the nitrogen adsorption module is used to release the high-pressure adsorbed nitrogen after the remaining gas after nitrogen adsorption is discharged through the oxygen-rich gas outlet, and then transport the released gas to the first target gas output module. After the nitrogen adsorption module adsorbs nitrogen in the air, the concentration of oxygen in the remaining gas increases, becoming oxygen-rich gas, that is, the first target gas. The first target gas is discharged through the oxygen-rich gas outlet on the nitrogen adsorption module, and then the nitrogen adsorbed by the nitrogen adsorption module is released, so that after the released gas is mixed with air received from the outside, the nitrogen adsorption module can perform the next nitrogen adsorption.

[0133] As an optional embodiment, the nitrogen adsorption module includes a separation valve and a molecular sieve tower, wherein the separation valve is used to control the gas flow route within the nitrogen adsorption module, wherein the separation valve is provided with an air inlet for receiving air, an air vent for air flowing to the molecular sieve tower, and an exhaust port for removing residual gas; the molecular sieve tower is used to perform high-pressure adsorption of nitrogen in the air, obtain residual gas after high-pressure adsorption, and release the high-pressure adsorbed nitrogen.

[0134] Air enters through the air inlet of the separation valve. At this time, the air inlet of the separation valve is connected to the air vent of the separation valve. The air enters the molecular sieve tower through the air vent of the separation valve for high-pressure nitrogen adsorption operation. The remaining gas after high-pressure adsorption enters the first target gas output module through the oxygen-rich gas exhaust port. After the molecular sieve tower performs high-pressure nitrogen adsorption, it needs to be depressurized and released. At this time, the air vent of the separation valve is connected to the exhaust port of the separation valve, that is, the nitrogen obtained after the molecular sieve tower is depressurized and released is discharged through the exhaust port of the separation valve, thus completing an adsorption cycle. After that, the air inlet of the separation valve is connected to the air vent of the separation valve, and high-pressure nitrogen adsorption is performed again, and so on, to complete the division of the air according to different gas components and obtain residual gas and oxygen-rich gas respectively.

[0135] As an optional embodiment, the gas separation device may further include: a flow limiting ring, wherein the flow limiting ring is used to limit the flow rate of the first target gas when it is discharged from the oxygen-rich gas outlet.

[0136] As an optional embodiment, at least two molecular sieve towers are provided, and the vent of the separation valve is used to switch between the at least two molecular sieve towers. By providing multiple molecular sieve towers in the nitrogen adsorption module, the multiple molecular sieve towers can simultaneously perform high-pressure nitrogen adsorption on air, achieving rapid production of the first target gas. Alternatively, the multiple molecular sieve towers can be cyclically and alternately performed high-pressure nitrogen adsorption on air, achieving continuous production of the first target gas, and so on.

[0137] As an optional embodiment, the molecular sieve tower includes a first molecular sieve tower and a second molecular sieve tower, and the vent of the separation valve includes a first vent and a second vent, the first vent being connected to the first molecular sieve tower, and the second vent being connected to the second molecular sieve tower. To improve the gas preparation efficiency of the gas supply assembly, the molecular sieve tower in the nitrogen adsorption module can be provided with multiple molecular sieve towers. For example, the molecular sieve tower can include a first molecular sieve tower and a second molecular sieve tower. Correspondingly, the interface connecting the separation valve and the molecular sieve tower, i.e., the vent, also includes a first vent and a second vent.

[0138] As an optional embodiment, in a first state, the separation valve controls the air inlet to be connected to the first air vent, and the second air vent to be connected to the exhaust port; in a second state, the separation valve controls the air inlet to be connected to the second air vent, and the first air vent to be connected to the exhaust port; wherein the separation valve cyclically switches between the first state and the second state according to a predetermined period. To improve the gas preparation efficiency of the gas supply assembly, in this embodiment, the first molecular sieve tower and the second molecular sieve tower need to alternately perform high-pressure nitrogen adsorption and pressure-reduced nitrogen release. To ensure that this process can proceed in an orderly manner, the separation valve in this embodiment is a two-position four-way valve, which can switch its internal flow route between the two states.

[0139] As an optional embodiment, when the first molecular sieve tower performs high-pressure adsorption on nitrogen in the air, the second molecular sieve tower performs equal pressure on the first molecular sieve tower, prompting the first molecular sieve tower to reduce pressure and release the high-pressure adsorbed nitrogen; when the second molecular sieve tower performs high-pressure adsorption on nitrogen in the air, the first molecular sieve tower performs equal pressure on the second molecular sieve tower, prompting the second molecular sieve tower to reduce pressure and release the high-pressure adsorbed nitrogen.

[0140] In the first state of the separation valve, air enters the first molecular sieve tower through the first air vent of the separation valve for pressurization. The first molecular sieve tower adsorbs nitrogen under high pressure to obtain oxygen-rich gas. Since the first molecular sieve tower and the second molecular sieve tower are connected, the first molecular sieve tower equalizes the pressure of the second molecular sieve tower, promoting the first molecular sieve tower to reduce the pressure and discharge the adsorbed nitrogen. The first molecular sieve tower is depressurized and desorbed. At this time, the separation valve is in the second state, and the nitrogen adsorbed by the first molecular sieve tower is discharged and discharged through the exhaust port of the separation valve. The first molecular sieve tower is regenerated to facilitate the next nitrogen adsorption. While the first molecular sieve tower is reducing the pressure and desorbing, the second molecular sieve tower is currently adsorbing nitrogen under high pressure. Part of the oxygen-rich gas remaining after the second molecular sieve tower adsorbs nitrogen is discharged from the oxygen-rich gas outlet, and part flows into the first molecular sieve tower to flush the first molecular sieve tower so that the nitrogen in the first molecular sieve tower can be quickly discharged, removing the residual nitrogen in the adsorbent in the first molecular sieve tower, thereby improving the regeneration ability of the molecular sieve tower and enhancing the nitrogen adsorption performance. The high-pressure adsorption and reduced-pressure desorption processes of the second molecular sieve tower are similar to those of the first molecular sieve tower and will not be described in detail here. The first and second molecular sieve towers alternately cycle through the air to perform the above treatment, efficiently obtaining residual gas and oxygen-rich gas.

[0141] As an optional embodiment, the gas separation device further includes a regulating assembly configured to limit the flow rate and / or direction of the first target gas when delivered to the first target gas output module. The regulating assembly provided on the gas separation device can receive control instructions from the controller and, in response to the control instructions, regulate the flow rate and / or direction of the first target gas when delivered to the first target gas output module.

[0142] As an optional embodiment, the regulating component includes one or more of a flow limiting ring, a speed regulating valve, a pressure regulating valve, a one-way valve, and a flow limiting valve.

[0143] Among them, the flow limiting ring can be used to limit the flow rate of the remaining gas when it is transported to the first target gas output module. The first molecular sieve tower and the second molecular sieve tower can be connected through the flow limiting ring. On the one hand, it can ensure that the first molecular sieve tower and the second molecular sieve tower can allow the oxygen-rich gas remaining after high-pressure adsorption of nitrogen to enter the first target gas output module through the flow limiting ring. On the other hand, it can promote pressure equalization between the first molecular sieve tower and the second molecular sieve tower.

[0144] As an optional embodiment, a speed regulating valve and / or a one-way valve is provided in the air receiving device.

[0145] By varying the opening of the speed regulating valve on the air receiving device, the rate at which air flows into the gas separation device can be controlled, and the oxygen concentration in the first target gas can also be controlled. For example, the slower the air inflow rate, the longer the nitrogen adsorption module takes to adsorb nitrogen from the air, and the higher the oxygen concentration in the first target gas delivered to the first target gas output device. The one-way valve only allows air outside the gas separation device to enter the gas separation device as feed gas, while preventing the first target gas from flowing back through the air receiving device. This ensures that the first target gas can be smoothly delivered to the first target gas delivery module.

[0146] It should be noted that the above-mentioned speed regulating valves can be replaced by electric speed regulating valves.

[0147] As an optional embodiment, the gas separation device also includes: a filter, an oil-free air compressor and a cooling unit, wherein the filter is used to filter dust and water vapor in the air to obtain filtered air; the oil-free air compressor is used to increase the gas pressure of the filtered air and increase the gas flow rate of the filtered air to obtain compressed air; the cooling unit is used to cool the compressed air to obtain treated air.

[0148] The filter removes dust and moisture from the air, effectively extending the life of the nitrogen adsorption module. Clean, dry air, or filtered air, passes through the filter and flows to the oil-free air compressor, which increases the air pressure and flow rate. This pressurization and acceleration of the air raises its temperature, which is then cooled by the cooling system to ensure the treated air is not too hot.

[0149] As an optional embodiment, the gas separation device in the above system is used to separate gases, and the separated gases can be used for different purposes. For example, it can be used to separate oxygen-rich gas for 3D printing, and can also separate low-oxygen gas for post-processing of 3D printing.

[0150] As an optional embodiment, the above system also includes: a residual gas reflow channel, and a low-oxygen gas output device, wherein the gas separation device is also used to separate the oxygen in the second target gas reflowing in the external air and / or the residual gas reflow channel to obtain a third target gas; the residual gas reflow channel is used to reflow the second target gas to the air receiving device; the low-oxygen gas output device is used to output the third target gas when receiving the third target gas. Based on the above structure, the gas separation device can not only provide oxygen-rich gas for 3D printing, but also output low-oxygen gas based on the separation process, thereby realizing the separation of two gases used in the 3D printing process based on the gas separation device, that is, achieving low-cost and efficient 3D printing.

[0151] As an optional embodiment, the gas separation device is provided with a first gas outlet and a second gas outlet, and the second target gas is discharged through the first gas outlet and flows to the air pre-treatment device through the residual gas return channel. By setting the above-mentioned gas outlet, it is possible to achieve that the second target gas with a relatively high oxygen concentration is discharged from the first gas outlet, flows to the air pre-treatment device through the residual gas return channel, merges with the pre-treated external air, and undergoes gas separation again to obtain a third target gas with a lower oxygen concentration.

[0152] As an optional embodiment, the first target gas output module is configured to receive and output the first target gas separated by the gas separation device and discharged from the second gas outlet. By providing the first target gas output module, the oxygen concentration in the first target gas and the flow rate of the first target gas can be better controlled.

[0153] As an optional embodiment, the first target gas output module is provided with a speed regulating valve for opening the oxygen-enriched gas output channel. The speed regulating valve on the first target gas output module can be used to control the gas flow rate and oxygen concentration of the oxygen-enriched gas (i.e., the first target gas). For example, a larger opening of the speed regulating valve on the first target gas output module increases the flow rate of the first target gas and decreases the oxygen concentration, and so on.

[0154] As an optional embodiment, the first target gas output module is provided with an oxygen concentration sensor for detecting the oxygen concentration of the received first target gas. The oxygen concentration sensor can be used to monitor the oxygen concentration of the first target gas received by the oxygen-enriched output device, thereby facilitating opening the speed regulating valve on the oxygen-enriched output device to output the first target gas when the oxygen concentration of the first target gas is sufficiently high.

[0155] As an optional embodiment, the first target gas output module is provided with a one-way valve for controlling air flow. The one-way valve only allows the first target gas to flow out of the first target gas output module, while preventing outside air from flowing in. This ensures that the inflow of outside air does not affect the oxygen concentration of the first target gas and the second target gas, thereby reducing the gas supply efficiency.

[0156] As an optional embodiment, the pressure differential unit is further configured to control the opening of a speed regulating valve on the first target gas output module based on the pressure of the first target gas. This pressure differential unit can monitor the pressure of the first target gas during output. The pressure differential unit can also automatically control the opening of the speed regulating valve by obtaining a pre-set pressure value and combining it with the monitored output pressure of the first target gas to achieve the desired output pressure of the first target gas.

[0157] As an optional embodiment, the gas separation device is used to perform high-pressure adsorption on the nitrogen in the air received in the air receiving device, and discharge the first target gas remaining after the high-pressure adsorption from the second gas outlet; and after the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain the second target gas, so that the second target gas can flow back to the gas separation device through the residual gas reflux channel for circulation treatment.

[0158] As an optional embodiment, the hypoxic gas output device is provided with a speed regulating valve for opening the hypoxic gas output channel. The speed regulating valve on the hypoxic gas output device can be fully opened to allow smooth air intake to the gas supply assembly. When preparing the hypoxic gas, the speed regulating valve on the hypoxic gas output device can be used to control the output flow rate of the hypoxic gas (i.e., the second target gas or the third target gas) and the nitrogen concentration in the hypoxic gas. For example, the greater the opening of the speed regulating valve on the hypoxic gas output device, the greater the output flow rate of the second target gas or the third target gas, the lower the nitrogen concentration in the second target gas or the third target gas, and so on.

[0159] As an optional embodiment, the hypoxic gas output device is provided with an oxygen concentration sensor for detecting the oxygen concentration of the received third target gas. The oxygen concentration sensor can be used to monitor the oxygen concentration of the third target gas received by the hypoxic gas output device, thereby facilitating opening the speed regulating valve on the hypoxic gas output device to output the third target gas only when the oxygen concentration of the residual gas is sufficiently low.

[0160] As an optional embodiment, the hypoxic gas output device is provided with a one-way valve for controlling air flow. The one-way valve only allows the second target gas to flow from the gas separation device or the residual gas return channel to the hypoxic gas output device, while preventing outside air from flowing from the hypoxic gas output device to the gas separation device or the residual gas return channel. This ensures that after the processed gas is separated into the first target gas and the second target gas by the gas separation device, the ingress of outside air does not affect the oxygen concentration of the first target gas and the second target gas, thereby reducing the gas supply effect.

[0161] As an optional embodiment, the air receiving device is provided with a speed regulating valve for adjusting the air inflow speed and / or a one-way valve for controlling the air flow direction. By changing the opening of the speed regulating valve on the air receiving device, the speed at which the air flows into the air supply assembly can be controlled. At the same time, the oxygen concentration in the third target gas can also be controlled. For example, the slower the air inflow speed, the lower the oxygen concentration in the third target gas output at the low-oxygen gas output device. The one-way valve only allows external air to enter as raw gas, and does not allow the second target gas that flows back from the residual gas reflux channel to the air pretreatment device to flow from the air receiving device to the outside world, thereby ensuring that the second target gas can be smoothly combined with the air received from the air receiving device for circulation processing to obtain a third target gas with a sufficiently low oxygen concentration.

[0162] As an optional embodiment, a switch valve is provided on the residual gas reflux channel, wherein the switch valve is used to open the residual gas reflux channel. By providing the switch valve on the residual gas reflux channel, the state of the residual gas reflux channel can be controlled. When it is necessary to prepare low-oxygen gas, the switch valve on the residual gas reflux channel can be opened to allow the second target gas to reflux to the air pretreatment device, thereby increasing the nitrogen concentration of the gas in the gas supply component, so as to obtain a third target gas with a lower oxygen concentration at the low-oxygen gas output device. When the switch valve on the residual gas reflux channel is closed, the second target gas no longer refluxes to the air pretreatment device, and the nitrogen concentration of the gas in the gas supply component is lower than the nitrogen concentration of the gas when the switch valve is open. That is, at this time, the gas supply component can more efficiently prepare the first target gas.

[0163] Based on the above embodiments and optional embodiments, the present application proposes an optional implementation method, which is described below.

[0164] An optional embodiment of the present application provides a 3D printing system. Figure 2 is a schematic diagram of the 3D printing system provided according to the optional embodiment of the present application. Figure 3 is a schematic diagram of the 3D printing system provided according to the optional embodiment of the present application. As shown in Figures 2 and 3, the gas separation device in the 3D printing system includes: a filter, a compressor, a separation valve, a molecular sieve tower, a flow limiting ring, a speed regulating valve, and a pressure differential unit. The following describes the process for preparing oxygen-enriched gas based on this gas separation device.

[0165] Air flows into the filter, which removes dust and moisture from the air. Dust and moisture significantly affect the efficiency of the molecular sieve column in producing oxygen-enriched gas. Therefore, filters can effectively extend the life of the molecular sieve column. After passing through the filter, the clean, dry air is pressurized and accelerated by an oil-free air compressor, which increases the pressure and flow rate. After this pressurization and acceleration, the air enters the cooling system. Since the pressurized air temperature rises, the cooling system cools it down to ensure that the output oxygen-enriched gas temperature does not exceed 50%. After passing through the cooling system, the cooled air enters the separation valve, a two-position, four-way valve. Port 1 is the air inlet, ports 2 and 3 are the ports connected to the molecular sieve column, and port 4 is the exhaust. The valve's channel switching logic switches port 1 to port 2 and port 3 to port 4 simultaneously. The second switching connects port 1 to port 3 and port 2 to port 4 simultaneously. The separation valves function by cyclically switching the gas path, circulating pressurized air into the molecular sieve tower while simultaneously discharging the gas from within. After passing through the separation valves, the pressurized gas enters the two inner chambers of the molecular sieve tower. The adsorbed nitrogen is discharged from the molecular sieve tower's air inlet as the separation valves switch. The molecular sieve tower adsorbs nitrogen from the air during pressurization, collecting the remaining unabsorbed oxygen-rich gas for purification to produce high-purity oxygen-rich gas. During depressurization, the molecular sieve tower releases the adsorbed nitrogen back into the ambient air through the separation valve. Upon the next pressurization, it can adsorb nitrogen again and produce oxygen-rich gas. This entire process is a cyclical, dynamic cycle. After exiting the molecular sieve tower, the oxygen-rich gas enters a flow restriction ring, which increases the pressure within the molecular sieve tower, thereby increasing the concentration of the output oxygen-rich gas. After passing through the flow restriction ring, the oxygen-enriched gas enters the check valve. This check valve further increases the pressure inside the molecular sieve tower, thereby increasing the concentration of the output oxygen-enriched gas while preventing it from flowing back out and being discharged. The oxygen-enriched gas then flows through the electric speed regulating valve and the differential pressure unit. The differential pressure unit detects the output pressure of the oxygen-enriched gas and feeds it back to the electric speed regulating valve, which adjusts the flow rate in real time, thereby changing the output pressure. The electric speed regulating valve regulates the flow rate in the pipeline, while the differential pressure unit monitors the air pressure in real time, achieving closed-loop pressure feedback and regulation.

[0166] Based on the above-mentioned gas separation device, oxygen-rich gas is prepared to meet the high oxygen concentration requirements in photocuring 3D printing, and the oxygen concentration and flow rate can be controlled, and the gas concentration and flow rate can be precisely controlled. The oxygen concentration control accuracy reaches 1%, and the gas flow rate control accuracy reaches 0.01L / min. The above-mentioned gas separation device can feedback the gas concentration and control and adjust it according to the feedback gas concentration, flow rate, and air pressure, so that the oxygen concentration is distributed according to the needs of 3D printing to achieve closed-loop control. At the same time, the above-mentioned gas separation device is provided with a special drying module at the gas input end to dry the input air. After the air compressor compresses the air, the drying module can be added or reduced according to the service life to ensure that the moisture content of the air input to the molecular sieve tower is extremely low, ensuring that the service life meets the requirements.

[0167] Therefore, the use of the above-mentioned gas separation device can achieve the separation of nitrogen in the air in photocuring 3D printing to obtain oxygen-rich gas, and transport the oxygen-rich gas to the air inlet at the material tray to form an oxygen-rich environment required for resin curing. The gas separation device in the embodiment of the present application can meet the requirements of oxygen concentration, flow rate and air pressure in the oxygen-rich gas, and can reduce the adhesion without affecting the printing accuracy. It can also achieve precise adjustment of the oxygen concentration, flow rate and air pressure in the oxygen-rich gas, and can adapt to the use of various material trays and platforms without causing accuracy or other impacts, while meeting the requirements for service life.

[0168] According to an embodiment of the present application, a 3D printing method is further provided. The method is executed by a controller. FIG4 is a flow chart of the 3D printing method provided according to an embodiment of the present application. As shown in FIG4 , the method includes the following steps:

[0169] S401 , generating a control instruction according to a pre-configured control strategy and sending the control instruction to the gas separation device, so that the gas separation device separates the first target gas from the air received from the outside based on the received control instruction and delivers the first target gas to the 3D printer.

[0170] In an embodiment of the present application, a controller is used to communicate with a 3D printer and a gas separation device. On the one hand, the controller can communicate with the 3D printer to enable it to perform 3D printing. On the other hand, the controller can communicate with the gas separation device to enable it to separate a first target gas from the air received from the outside according to the received control instructions, and deliver the first target gas to the 3D printer to help the 3D printer achieve better printing effects, thereby solving the technical problem that there is no stable gas supply device suitable for 3D printing.

[0171] As an optional embodiment, the above-mentioned gas separation device, based on the control instruction received, separates the first target gas from the air received from the outside world for delivery to the 3D printer. The following processing methods can be adopted: an air receiving device is used to receive the outside air, and the received air is conducted to the air pretreatment device; the air pretreatment device is used to process the air received by the air receiving device to obtain treated air, and the treated air is conducted to the gas separation device; the gas separation device is used to perform high-pressure adsorption on the nitrogen in the treated air, and the remaining part of the first target gas after the high-pressure adsorption is discharged from the second air outlet for delivery to the 3D printer. Through the above steps, the air receiving device is used to receive the outside air, and after the air is processed by the air pretreatment device, the gas separation device is used to adsorb the nitrogen in the treated air, so that the first target gas with a higher oxygen concentration can be obtained at the second air outlet.

[0172] As an optional embodiment, when a first target gas output module is connected to the second gas outlet of the gas separation device and a flow control valve is provided on the first target gas output module, the method further includes: when an oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is a target oxygen concentration, opening the flow control valve on the first target gas output module to output the first target gas. By connecting the first target gas output module to the second gas outlet, the oxygen concentration in the first target gas and the flow rate of the first target gas can be better controlled.

[0173] As an optional embodiment, the method further includes adjusting the openings of a flow control valve on the air receiving device and a flow control valve on the first target gas output module based on a current oxygen concentration and a target oxygen concentration detected by an oxygen concentration sensor on the first target gas output module. For example, a larger opening of the flow control valve on the first target gas output module increases the flow rate of the first target gas and decreases the oxygen concentration, and so on.

[0174] As an optional embodiment, when a pressure differential unit is provided on the first target gas output module, the method further includes: detecting the pressure of the first target gas based on the pressure differential unit, and using the pressure differential unit to control the speed control valve on the first target gas output module and the opening of the speed control valve on the air receiving device based on the pressure of the first target gas. The pressure differential unit on the first target gas output module can monitor the pressure of the first target gas during output. The pressure differential unit can also automatically control the opening of the speed control valve by obtaining a pre-set pressure value and combining it with the output pressure of the first target gas it monitors to achieve the desired output pressure of the first target gas.

[0175] As an optional embodiment, the first target gas is used to supply oxygen for the printing process of 3D printing.

[0176] As an optional embodiment, the method further includes: after discharging the portion of the first target gas, releasing the high-pressure adsorbed nitrogen to obtain a second target gas; using a residual gas reflux channel to return the second target gas to the air pretreatment device, and circulating it in combination with the air received from the air receiving device; using an oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel to detect the oxygen concentration in the second target gas after the circulation treatment; when the oxygen concentration sensor detects that the current oxygen concentration is the target oxygen concentration, obtaining a third target gas, and opening the speed control valve on the low-oxygen gas output device to output the third target gas. An air receiving device is used to receive external air, and after using an air pretreatment device to process the air, a gas separation device is used to adsorb nitrogen in the treated air, and the treated air is divided into a first target gas with a higher oxygen concentration and a second target gas with a lower oxygen concentration. The second target gas is returned to the air pretreatment device through the residual gas reflux channel, and is subjected to a cyclic treatment process such as air treatment and high-pressure nitrogen adsorption together with the air received from the outside by the air receiving device. During this process, the gas separation device will continuously adsorb nitrogen on the gas flowing into it, that is, after multiple cycles of treatment, a second target gas with a lower oxygen concentration can be obtained, and the second target gas will flow to the low-oxygen gas output device. When the second target gas received by the low-oxygen gas output device is the third target gas, the speed control valve is opened to output the third target gas.

[0177] As an optional embodiment, the method further includes adjusting the openings of the speed control valves on the air receiving device and the speed control valves on the hypoxic gas output device based on the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device. For example, a larger opening of the speed control valve on the hypoxic gas output device may result in a lower nitrogen concentration in the third target gas and a higher flow rate. Conversely, if the opening of the speed control valve on the hypoxic gas output device remains unchanged, a smaller opening of the speed control valve on the air receiving device may result in a higher nitrogen concentration in the third target gas and a lower flow rate, and so on.

[0178] As an optional embodiment, the method further includes: when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, adjusting the opening of the speed regulating valve on the first target gas output module based on the current oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device and the target oxygen concentration. For example, a larger opening of the speed regulating valve on the first target gas output module increases the output flow rate of the third target gas and decreases the nitrogen concentration in the third target gas, and so on.

[0179] As an optional embodiment, the third target gas is used as a curing protective gas in post-3D printing processing. Low-oxygen gas can be used in any field requiring low oxygen (anti-oxidation), such as industrial packaging, food packaging, and 3D printing post-curing. In 3D printing post-curing applications, using low-oxygen gas as a curing protective atmosphere can prevent oxygen inhibition of the resin on the surface of the printed part to be cured, thereby improving the curing effect and quality.

[0180] Low-oxygen gas holds a wide range of application prospects in the relevant technology. For example, it can be used to store fruits and vegetables to inhibit mold growth and pests, thereby achieving better preservation. Low-oxygen gas, applied to food packaging, does not chemically react with or be absorbed by food. This reduces the oxygen content within the packaging, significantly inhibiting the growth and reproduction of microorganisms such as bacteria and mold, and slowing down oxidation and spoilage, thereby preserving food freshness. Packaging food with low-oxygen gas can also effectively prevent food from being crushed, stuck together, or lumped together, preserving its geometric shape, dryness, crispness, color, and flavor. For example, low-oxygen gas can be supplied to a food sealing machine. After placing food in a sealed container, high-pressure low-oxygen gas is supplied to remove oxygen from the container. For example, low-oxygen supply sealing technology can remove oxygen from the packaging bag, placing it in a low-oxygen environment. This reduces the effects of oxygen on fruits and vegetables, meat products, seafood, dairy products, and the like, extending their shelf life and preserving their original nutrients while maintaining their original color and flavor.

[0181] Hypoxic gas can also be used for hypoxic training, which involves artificially creating a low oxygen environment or inhaling hypoxic gas to simulate the low oxygen conditions of high altitudes. Hypoxic fitness involves artificially reducing the oxygen content in the gym to below normal levels. To adapt to the low oxygen and low air pressure, people experience an increase in heart rate and blood output, which in turn increases the number of oxygen-carrying red blood cells and hemoglobin in the blood. This enhances the blood's oxygen transport capacity and its ability to diffuse oxygen to tissues. Consequently, the body's oxygen utilization rate increases. Hypoxic gas can be supplied to specific gym systems for hypoxic training.

[0182] In addition, low-oxygen gas can also be used for post-curing treatment of 3D printing, etc. The following is an explanation of the application of low-oxygen gas in 3D printing technology.

[0183] 3D printing technology uses 3D printing equipment to create three-dimensional solids layer by layer based on a 3D model of an object. 3D printing can overcome structural obstacles that are currently inaccessible to traditional machining, enabling the simplified production of arbitrarily complex structural components.

[0184] Current 3D printing technologies include stereolithography (SLA), digital light processing (DLP), liquid crystal display (LCD), fused deposition modeling (FDM), and selective laser sintering (SLS). Among them, prints made with 3D printing technologies such as SLA, DLP, and LCD require post-curing (photocuring) to fully solidify the material in order to improve the physical and mechanical properties of the material.

[0185] The curing of photocurable resins consumes free radicals due to competition between oxygen and free radical polymerization reactions, a phenomenon known as oxygen inhibition. 3D printed parts are cured in air, with the curing chamber filled with air. The oxygen content in air is 21%. Oxygen inhibition can cause the surface of the printed part to not fully cure, preventing it from achieving good density and surface hardness. Therefore, reducing or removing oxygen during post-curing can achieve better surface curing. Oxygen-isolating curing methods include water-bath curing, solvent-based curing, and nitrogen-filled curing. Water-based curing can produce less than ideal curing results due to water absorption by the resin and the presence of dissolved oxygen in the water. Solvent-based curing reduces the light intensity reaching the printed part as the light path passes through the solvent. Furthermore, the solvent can also absorb water or dissolve oxygen in the air, which can compromise the curing effect. Therefore, nitrogen-filled curing offers the best curing results in the prior art.

[0186] In order to reduce the oxygen concentration, the existing technology uses high-purity nitrogen to reduce the oxygen concentration during the curing process. The traditional way to obtain high-concentration nitrogen is to purchase nitrogen tanks or use large-scale nitrogen production equipment. The method of using nitrogen tanks to supply nitrogen is not safe for home use due to the high internal pressure of the nitrogen tanks. In addition, the storage capacity of nitrogen tanks is limited and they need to be replaced after use. It is impossible to obtain nitrogen continuously for a long time. The operating pressure will also change with the consumption, and the continuous stability of the gas supply is insufficient. Large-scale nitrogen production equipment has a large overall size and a high nitrogen production output, which is not suitable for ordinary household or civilian use. Ordinary household or civilian use requires small equipment.

[0187] Therefore, in the related art, nitrogen tanks are commonly used to supply nitrogen to reduce the oxygen concentration in the air. However, nitrogen tanks are not safe and convenient to use, and the gas supply is not stable, making them unsuitable for ordinary household or civilian use. Therefore, the related art has a technical problem of not having a stable gas supply device suitable for 3D printing.

[0188] In response to the above problems, an embodiment of the present application provides an air supply component. Figure 5 is a schematic diagram of the air supply component provided according to an embodiment of the present application. As shown in Figure 5, the air supply component includes: an air receiving device, a gas separation device, a residual gas reflux channel, and a low-oxygen gas output device, wherein the air receiving device is used to receive external air; the gas separation device is used to separate the oxygen in the external air and / or the second target gas refluxed in the residual gas reflux channel to obtain a third target gas; the residual gas reflux channel is used to reflux the second target gas to the air receiving device; and the low-oxygen gas output device is used to output the third target gas when the third target gas is received.

[0189] In an embodiment of the present application, based on the air receiving device, the air pretreatment device, the gas separation device, the residual gas reflux channel, the low-oxygen gas output device, and the connection relationship between the various devices, the air supply component can receive air from the outside, and after processing the air, the gas separation device is used to adsorb the nitrogen in the treated air, and the treated air is divided into a first target gas with a higher oxygen concentration, and a second target gas with a lower oxygen concentration. The second target gas flows back to the air pretreatment device through the residual gas reflux channel, and is subjected to a cyclic treatment process such as air treatment and high-pressure nitrogen adsorption together with the air received from the outside by the air receiving device. During this process, the gas separation device in the air supply component will continuously adsorb nitrogen on the gas flowing into it, that is, after multiple cycles of treatment, a second target gas with a higher oxygen concentration can be obtained. The invention relates to a method for producing a first target gas and a second target gas with a lower oxygen concentration, and the second target gas will flow to the low-oxygen gas output device. When the second target gas received by the low-oxygen gas output device is the third target gas, the speed regulating valve can be opened to output the third target gas, thereby achieving the purpose of using the gas supply component to prepare the third target gas with a higher nitrogen concentration and the first target gas with a higher oxygen concentration. Moreover, the gas supply component has no consumables during its service life and does not require parts replacement. The overall size of the component is relatively small, the equipment is miniature, simple, convenient for civilian use, and more convenient to use. Moreover, by adjusting the opening of each speed regulating valve in the gas supply component, the flow rate and concentration of the third target gas and the first target gas can also be accurately controlled, thereby achieving the technical effect of stable gas supply, thereby solving the technical problem that there is no stable gas supply device suitable for 3D printing.

[0190] It should be noted that the second target gas and the third target gas in the embodiment of the present application are both low-oxygen gases, but the oxygen concentration of the second target gas is greater than the oxygen concentration of the third target gas. For example, the oxygen concentration of the second target gas can be 5%-21%, and the oxygen concentration of the third target gas can be lower than 5%, such as 1%, 2%, 3%, 4%, etc. The first target gas is an oxygen-rich gas, such as an oxygen concentration higher than 21%, such as an oxygen concentration of 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc.

[0191] As an optional embodiment, the air supply assembly further includes an air pre-treatment device, wherein the air outlet of the air receiving device is connected to the air inlet of the air pre-treatment device, and the air outlet of the air pre-treatment device is connected to the air inlet of the gas separation device. By adding the air pre-treatment device between the air receiving device and the gas separation device, the received external air can be pre-treated before gas separation, thereby achieving better gas separation and extending the service life of the air supply assembly.

[0192] As an optional embodiment, the air pretreatment device includes: a filter, an air compressor and a cooling unit, wherein the filter is used to remove dust and water vapor from the air received by the air receiving device to obtain filtered air; the air compressor is used to increase the gas pressure of the filtered air and increase the gas flow rate of the filtered air to obtain compressed air; and the cooling unit is used to cool the compressed air to obtain treated air. The function of the filter is to filter dust and water vapor from the air, thereby effectively improving the life of the gas separation device. The clean and dry gas, i.e. the filtered air, flows to the air compressor after passing through the filter. The air compressor can increase the gas pressure and increase the air flow rate. After the air is pressurized and accelerated, the temperature rises, and the cooling system is used to cool the compressed air to ensure that the temperature of the treated air is not too high.

[0193] As an optional embodiment, the gas separation device is provided with a first gas outlet and a second gas outlet. The second target gas is discharged through the first gas outlet and flows to the air pretreatment device through a residual gas return channel. After being discharged from the first gas outlet, the second target gas with a relatively high oxygen concentration flows to the air pretreatment device through the residual gas return channel, where it merges with the pretreated external air and undergoes gas separation again to obtain a third target gas with an even lower oxygen concentration.

[0194] As an optional embodiment, the gas supply assembly further includes a first target gas output module configured to receive and output the first target gas separated by the gas separation device and discharged from the second gas outlet. In this embodiment, the provision of the first target gas output module allows for better control of the oxygen concentration in the first target gas and the flow rate of the first target gas.

[0195] As an optional embodiment, the first target gas output module is provided with a speed regulating valve for opening the oxygen-rich gas output channel. When it is necessary to use the gas supply assembly to prepare oxygen-rich gas, the speed regulating valve on the first target gas output module can be used to control the gas flow rate and oxygen concentration of the oxygen-rich gas (i.e., the first target gas). For example, the larger the opening of the speed regulating valve on the first target gas output module, the greater the flow rate of the first target gas, the lower the oxygen concentration, and so on. When it is necessary to use the gas supply assembly to prepare hypoxic gas, the speed regulating valve on the first target gas output module can be used to control the output flow rate of the hypoxic gas (i.e., the second target gas or the third target gas) and the nitrogen concentration in the hypoxic gas. For example, the larger the opening of the speed regulating valve on the first target gas output module, the greater the output flow rate of the second target gas or the third target gas, the lower the nitrogen concentration in the second target gas or the third target gas, and so on. When it is necessary to use the gas supply assembly to simultaneously prepare oxygen-rich gas and low-oxygen gas, the speed control valve on the first target gas output module can be used to control the oxygen concentration in the oxygen-rich gas and the nitrogen concentration in the low-oxygen gas. For example, the larger the opening of the speed control valve on the first target gas output module, the lower the oxygen concentration in the first target gas, the higher the nitrogen concentration in the second target gas or the third target gas, and so on.

[0196] As an optional embodiment, the first target gas output module is provided with an oxygen concentration sensor for detecting the oxygen concentration of the received first target gas. This oxygen concentration sensor can be used to monitor the oxygen concentration of the first target gas received by the oxygen-enriched output device, thereby ensuring that the oxygen concentration of the first target gas is sufficiently high before opening the speed regulating valve on the oxygen-enriched output device to output the first target gas.

[0197] As an optional embodiment, the first target gas output module is provided with a one-way valve for controlling air flow. This one-way valve only allows the first target gas to flow out of the first target gas output module, while preventing air from outside the gas supply assembly from flowing into the gas supply assembly through the first target gas output module. This ensures that the inflow of outside air does not affect the oxygen concentration of the first and second target gases, thereby reducing the gas supply efficiency.

[0198] As an optional embodiment, the first target gas output module is provided with a pressure differential unit, which is used to detect the pressure of the first target gas and control the opening of the speed control valve on the first target gas output module based on the pressure of the first target gas. The pressure differential unit on the first target gas output module can monitor the pressure of the first target gas during output. The pressure differential unit can also automatically control the opening of the speed control valve by obtaining a pre-set pressure value and combining it with the output pressure of the first target gas it monitors to achieve the desired output pressure of the first target gas.

[0199] As an optional embodiment, a gas separation device is used to perform high-pressure adsorption on nitrogen in the air received in the air receiving device, and discharge the first target gas remaining after the high-pressure adsorption from the second gas outlet; and after the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain a second target gas, so that the second target gas can flow back to the gas separation device through the residual gas reflux channel for circulation treatment.

[0200] As an optional embodiment, the gas separation device includes: a separation valve, a molecular sieve tower and a flow limiting ring, wherein the separation valve is used to control the gas flow route within the gas separation device, wherein the separation valve is provided with an air inlet for receiving treated air, an air vent for the treated air to flow to the molecular sieve tower, and an exhaust port for discharging residual gas; the molecular sieve tower is used to perform high-pressure adsorption on the nitrogen in the treated air, and after the remaining first target gas after the high-pressure adsorption is discharged from the second outlet, the high-pressure adsorbed nitrogen is released to obtain a second target gas; the flow limiting ring is used to limit the flow rate of the first target gas when it is discharged from the second outlet.

[0201] The treated air enters through the air inlet of the separation valve. At this time, the air inlet of the separation valve is connected to the air vent of the separation valve. The treated air enters the molecular sieve tower through the air vent of the separation valve for high-pressure nitrogen adsorption operation. The remaining first target gas after adsorption is discharged from the second air outlet through the flow limiting ring. After the molecular sieve tower performs high-pressure nitrogen adsorption, it needs to be depressurized and released. At this time, the air vent of the separation valve is connected to the exhaust port of the separation valve, that is, the second target gas obtained after the molecular sieve tower is depressurized and released flows to the residual gas reflux channel through the exhaust port of the separation valve, thus completing an adsorption cycle. After the second target gas enters the residual gas reflux channel, the air inlet of the separation valve is connected to the air vent of the separation valve, and high-pressure nitrogen adsorption is performed again, and so on, to complete the division of the treated air according to different gas components, and obtain the second target gas and the first target gas respectively.

[0202] As an optional embodiment, when the molecular sieve tower includes a first molecular sieve tower and a second molecular sieve tower, and the vent of the separation valve includes a first vent and a second vent, the first vent is connected to the first molecular sieve tower, and the second vent is connected to the second molecular sieve tower. To improve the gas preparation efficiency of the gas supply assembly, the gas separation device can be provided with multiple molecular sieve towers. For example, the molecular sieve tower can include a first molecular sieve tower and a second molecular sieve tower. Correspondingly, the interface connecting the separation valve and the molecular sieve tower, i.e., the vent, also includes a first vent and a second vent.

[0203] As an optional embodiment, in the first state, the separation valve controls the air inlet to be connected to the first air vent, and the second air vent to be connected to the exhaust port; in the second state, the separation valve controls the air inlet to be connected to the second air vent, and the first air vent to be connected to the exhaust port; the separation valve cyclically switches between the first state and the second state according to a predetermined period. To improve the gas preparation efficiency of the gas supply assembly, in this embodiment, the first molecular sieve tower and the second molecular sieve tower need to alternately perform high-pressure nitrogen adsorption and pressure-reduced nitrogen release. To ensure that this process can proceed in an orderly manner, the separation valve in this embodiment is a two-position four-way valve, which can switch its internal flow route between the two states.

[0204] As an optional embodiment, the first molecular sieve tower and the second molecular sieve tower are connected via a flow restrictor ring. This connection ensures that the first molecular sieve tower and the second molecular sieve tower can discharge the remaining first target gas from the second gas outlet after high-pressure nitrogen adsorption, and promotes pressure equalization between the first molecular sieve tower and the second molecular sieve tower.

[0205] As an optional embodiment, when the first molecular sieve tower performs high-pressure adsorption on the nitrogen in the treated air, the second molecular sieve tower performs equal pressure on the first molecular sieve tower, prompting the first molecular sieve tower to reduce pressure and release the high-pressure adsorbed nitrogen; when the second molecular sieve tower performs high-pressure adsorption on the nitrogen in the treated air, the first molecular sieve tower performs equal pressure on the second molecular sieve tower, prompting the second molecular sieve tower to reduce pressure and release the high-pressure adsorbed nitrogen.

[0206] In the first state of the separation valve, the treated air enters the first molecular sieve tower through the first air vent of the separation valve for pressurization. The first molecular sieve tower adsorbs nitrogen under high pressure to obtain the first target gas. Due to the effect of the flow limiting ring, the first molecular sieve tower and the second molecular sieve tower are in a connected state. At this time, the first molecular sieve tower balances the pressure of the second molecular sieve tower, promoting the first molecular sieve tower to reduce the pressure and discharge the adsorbed nitrogen. The first molecular sieve tower reduces the pressure and desorbs. At this time, the separation valve is in the second state, and the nitrogen adsorbed by the first molecular sieve tower is discharged and flows to the residual gas reflux channel through the exhaust port of the separation valve. The first molecular sieve tower It is regenerated to facilitate the next nitrogen adsorption. While the first molecular sieve tower is undergoing pressure reduction and desorption, the second molecular sieve tower is currently adsorbing nitrogen at high pressure. A portion of the first target gas remaining after the second molecular sieve tower adsorbs nitrogen will be discharged from the second gas outlet through the flow limiting ring, and a portion will flow into the first molecular sieve tower to flush the first molecular sieve tower so that the second target gas in the first molecular sieve tower can quickly flow to the residual gas reflux channel to remove the residual nitrogen in the adsorbent in the first molecular sieve tower, thereby improving the regeneration capacity of the molecular sieve tower and enhancing the adsorption performance of nitrogen. The high-pressure adsorption and pressure reduction and desorption process of the second molecular sieve tower is similar to that of the first molecular sieve tower and will not be repeated here. The first molecular sieve tower and the second molecular sieve tower can efficiently obtain the second target gas and the first target gas by performing the above-mentioned treatment on the treated air in turn.

[0207] As an optional embodiment, the hypoxic gas output device is provided with a speed regulating valve for opening the hypoxic gas output channel. Similar to the speed regulating valve on the first target gas output module, the speed regulating valve on the hypoxic gas output channel can also be used to adjust the oxygen concentration and flow rate of the second target gas and the third target gas, as well as the oxygen concentration of the first target gas. When it is necessary to use the gas supply assembly to prepare oxygen-rich gas, the speed regulating valve on the hypoxic gas output device can be fully opened so that the gas supply assembly can smoothly intake air. When it is necessary to use the gas supply assembly to prepare hypoxic gas, the speed regulating valve on the hypoxic gas output device can be used to control the output flow rate of the hypoxic gas (i.e., the second target gas or the third target gas) and the nitrogen concentration in the hypoxic gas. For example, the larger the opening of the speed regulating valve on the hypoxic gas output device, the greater the output flow rate of the second target gas or the third target gas, the smaller the nitrogen concentration in the second target gas or the third target gas, and so on. When it is necessary to use the gas supply assembly to simultaneously prepare oxygen-rich gas and low-oxygen gas, the speed regulating valve on the low-oxygen gas output device can be used to control the oxygen concentration in the oxygen-rich gas and the nitrogen concentration in the low-oxygen gas. For example, the larger the opening of the speed regulating valve on the low-oxygen gas output device, the lower the nitrogen concentration in the second target gas or the third target gas, the higher the nitrogen concentration, and so on.

[0208] As an optional embodiment, the hypoxic gas output device is provided with an oxygen concentration sensor for detecting the oxygen concentration of the received third target gas. The oxygen concentration sensor can be used to monitor the oxygen concentration of the third target gas received by the hypoxic gas output device, thereby ensuring that the oxygen concentration of the residual gas is sufficiently low before opening the speed regulating valve on the hypoxic gas output device to output the third target gas.

[0209] As an optional embodiment, the hypoxic gas output device is provided with a one-way valve for controlling the direction of air flow. This one-way valve only allows the second target gas to flow from the gas separation device or the residual gas return channel to the hypoxic gas output device, while preventing air outside the gas supply assembly from flowing from the hypoxic gas output device to the gas separation device or the residual gas return channel. This ensures that after the processed gas is separated into the first target gas and the second target gas by the gas separation device, the ingress of outside air does not affect the oxygen concentration of the first target gas and the second target gas, thereby reducing the gas supply effect.

[0210] As an optional embodiment, the air receiving device is provided with a speed regulating valve for adjusting the air inflow speed and / or a one-way valve for controlling the air flow direction. By changing the opening of the speed regulating valve on the air receiving device, the speed at which the air flows into the air supply assembly can be controlled. At the same time, the oxygen concentration in the third target gas can also be controlled. For example, the slower the air inflow speed, the lower the oxygen concentration in the third target gas output at the low-oxygen gas output device. The one-way valve only allows air outside the air supply assembly to enter the air supply assembly as raw gas, and does not allow the second target gas that flows back from the residual gas reflux channel to the air pretreatment device to flow from the air receiving device to the outside world, thereby ensuring that the second target gas can be smoothly combined with the air received from the air receiving device for circulation processing to obtain the third target gas with a sufficiently low oxygen concentration.

[0211] As an optional embodiment, a switch valve is provided on the residual gas reflux channel, wherein the switch valve is used to open the residual gas reflux channel. By providing the switch valve on the residual gas reflux channel, the state of the residual gas reflux channel can be controlled. When the gas supply assembly needs to be used to prepare low-oxygen gas, the switch valve on the residual gas reflux channel can be opened to allow the second target gas to flow back to the air pretreatment device, thereby increasing the nitrogen concentration of the gas in the gas supply assembly, so as to obtain a third target gas with a lower oxygen concentration at the low-oxygen gas output device. When the switch valve on the residual gas reflux channel is closed, the second target gas no longer flows back to the air pretreatment device, and the nitrogen concentration of the gas in the gas supply assembly is lower than the nitrogen concentration of the gas when the switch valve is open. That is, at this time, the gas supply assembly can more efficiently prepare the first target gas.

[0212] It should be noted that the above-mentioned speed regulating valves can be replaced by electric speed regulating valves, and concentration detection sensors and flow sensors can be added to the oxygen-rich gas and low-oxygen gas output ports to achieve real-time automatic adjustment of the concentration and flow of the oxygen and nitrogen ports.

[0213] According to an embodiment of the present application, a gas preparation method is further provided. FIG6 is a flow chart of a gas preparation method 1 according to an embodiment of the present application. As shown in FIG6 , the method includes the following steps:

[0214] Step S202: using an air receiving device to receive outside air and directing the received air to an air pre-treatment device;

[0215] Step S604: using an air pre-treatment device to process the air received by the air receiving device to obtain treated air, and then conducting the treated air to the gas separation device;

[0216] Step S606: Using a gas separation device to perform high-pressure adsorption on the nitrogen in the treated air, and discharging the remaining portion of the first target gas from the second gas outlet after the high-pressure adsorption, and after discharging the portion of the first target gas, releasing the high-pressure adsorbed nitrogen to obtain a second target gas;

[0217] Step S608, using the residual gas reflux channel to return the second target gas to the air pre-treatment device, and combining it with the air received from the air receiving device for circulatory treatment;

[0218] Step S610, using an oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel to detect the oxygen concentration in the second target gas after the circulation treatment;

[0219] Step S612: When the oxygen concentration sensor detects that the current oxygen concentration is the target oxygen concentration, the speed regulating valve on the hypoxic gas output device is opened to output the third target gas.

[0220] Through the above steps, an air receiving device is used to receive external air, and after the air is processed by an air pretreatment device, a gas separation device is used to adsorb nitrogen in the processed air, and the processed air is divided into a first target gas with a higher oxygen concentration, and a second target gas with a lower oxygen concentration. The second target gas is returned to the air pretreatment device through the residual gas reflux channel, and is subjected to a cyclic treatment process such as air treatment and high-pressure nitrogen adsorption together with the air received from the outside by the air receiving device. During this process, the gas separation device will continuously adsorb nitrogen on the gas flowing into it, that is, after multiple cycles of treatment, a second target gas with a lower oxygen concentration can be obtained, and the second target gas will flow to the low-oxygen gas output device. When the second target gas received by the low-oxygen gas output device is the third target gas, the speed regulating valve is opened to output the third target gas.

[0221] As an optional embodiment, the method further includes adjusting the openings of the speed control valves on the air receiving device and the speed control valves on the hypoxic gas output device based on the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device. For example, a larger opening of the speed control valve on the hypoxic gas output device may result in a lower nitrogen concentration in the third target gas and a higher flow rate. Conversely, if the opening of the speed control valve on the hypoxic gas output device remains unchanged, a smaller opening of the speed control valve on the air receiving device may result in a higher nitrogen concentration in the third target gas and a lower flow rate, and so on.

[0222] As an optional embodiment, the method further includes: when a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, adjusting the opening of the speed regulating valve on the first target gas output module based on the current oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device and the target oxygen concentration. For example, a larger opening of the speed regulating valve on the first target gas output module increases the output flow rate of the third target gas and decreases the nitrogen concentration in the third target gas, and so on.

[0223] As an optional embodiment, the third target gas is used as a curing protective gas in post-3D printing processing. Low-oxygen gas can be used in any field requiring low oxygen (anti-oxidation), such as industrial packaging, food packaging, and 3D printing post-curing. In 3D printing post-curing applications, using low-oxygen gas as a curing protective atmosphere can prevent oxygen inhibition of the resin on the surface of the printed part to be cured, thereby improving the curing effect and quality.

[0224] According to an embodiment of the present application, a gas preparation method is further provided. FIG7 is a flow chart of a second gas preparation method according to an embodiment of the present application. As shown in FIG7 , the method includes the following steps:

[0225] Step S702: using an air receiving device to receive outside air and directing the received air to an air pre-treatment device;

[0226] Step S704: using an air pre-treatment device to process the air received by the air receiving device to obtain treated air, and then conducting the treated air to the gas separation device;

[0227] In step S706 , a gas separation device is used to perform high-pressure adsorption on the nitrogen in the treated air, and the remaining first target gas after the high-pressure adsorption is discharged from the second gas outlet.

[0228] Through the above steps, the air receiving device is used to receive the outside air, and the air is treated by the air pretreatment device. Then, the gas separation device is used to adsorb the nitrogen in the treated air, so that the first target gas with a higher oxygen concentration can be obtained at the second gas outlet.

[0229] As an optional embodiment, if a first target gas output module is connected to the second gas outlet of the gas separation device and a flow control valve is provided on the first target gas output module, the method further includes: when an oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration, opening the flow control valve on the first target gas output module to output the first target gas. In this embodiment, by connecting the first target gas output module to the second gas outlet, the oxygen concentration in the first target gas and the flow rate of the first target gas can be better controlled.

[0230] As an optional embodiment, the method further includes adjusting the openings of a flow control valve on the air receiving device and a flow control valve on the first target gas output module based on a current oxygen concentration and a target oxygen concentration detected by an oxygen concentration sensor on the first target gas output module. For example, a larger opening of the flow control valve on the first target gas output module increases the flow rate of the first target gas and decreases the oxygen concentration, and so on.

[0231] As an optional embodiment, when a pressure differential unit is provided on the first target gas output module, the method further includes: detecting the pressure of the first target gas based on the pressure differential unit, and using the pressure differential unit to control the opening of the speed control valve on the first target gas output module and the speed control valve on the air receiving device based on the pressure of the first target gas. The pressure differential unit on the first target gas output module can monitor the pressure of the first target gas during output. The pressure differential unit can also automatically control the opening of the speed control valve by obtaining a pre-set pressure value and combining it with the output pressure of the first target gas it monitors to achieve the desired output pressure of the first target gas.

[0232] As an optional embodiment, the first target gas is used to supply oxygen for the 3D printing process. The first target gas can be used in any field requiring oxygen, such as medical and household applications. When applied to 3D printing scenarios, the oxygen-rich gas can help reduce the peeling force between the resin and the bottom of the material tray after curing during the printing process, thereby increasing printing speed. For example, it can be applied to a 3D printer to provide oxygen to the material tray, so that during the light curing process, oxygen inhibition is formed between the bottom of the material tray and the molded print part, reducing the adhesion force and the separation force, thereby improving printing efficiency.

[0233] According to an embodiment of the present application, a gas preparation method is further provided. FIG8 is a flow chart of a gas preparation method 3 provided according to an embodiment of the present application. As shown in FIG8 , the method includes the following steps:

[0234] Step S802: using an air receiving device to receive outside air and directing the received air to an air pre-treatment device;

[0235] Step S804: using an air pre-treatment device to process the air received by the air receiving device to obtain treated air, and then conducting the treated air to the gas separation device;

[0236] Step S806: Using a gas separation device to perform high-pressure adsorption on the nitrogen in the treated air, and discharging the remaining portion of the first target gas from the second gas outlet after the high-pressure adsorption, and after discharging the portion of the first target gas, releasing the high-pressure adsorbed nitrogen to obtain a second target gas;

[0237] Step S808, using the residual gas reflux channel to reflux the second target gas to the air pre-treatment device, and combining it with the air received from the air receiving device for circulatory treatment;

[0238] Step S810, using an oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel to detect the oxygen concentration in the second target gas after the circulation treatment;

[0239] Step S812: When the oxygen concentration sensor on the hypoxic gas output device detects that the current oxygen concentration is the target oxygen concentration of the hypoxic gas, the speed regulating valve on the hypoxic gas output device is opened to output the third target gas.

[0240] Through the above steps, an air receiving device is used to receive external air, and after the air is processed by an air pretreatment device, a gas separation device is used to adsorb nitrogen in the processed air, and the processed air is divided into a first target gas with a higher oxygen concentration and a second target gas with a lower oxygen concentration. The first target gas is discharged from the second gas outlet, and the second target gas is returned to the air pretreatment device through the residual gas reflux channel, and is subjected to a cyclic treatment process such as air treatment and high-pressure nitrogen adsorption together with the air received from the outside by the air receiving device. During this process, the gas separation device in the air supply assembly will continuously adsorb nitrogen on the gas flowing into it, that is, after multiple cycles of treatment, a first target gas with a higher oxygen concentration and a second target gas with a lower oxygen concentration can be obtained, and the second target gas will flow to the low-oxygen gas output device. When the second target gas received by the low-oxygen gas output device is the third target gas, the speed regulating valve is opened to output the third target gas.

[0241] As an optional embodiment, when a first target gas output module is connected to the second gas outlet of the gas separation device and a flow control valve is provided on the first target gas output module, the method further includes: when an oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration of the oxygen-rich gas, opening the flow control valve on the first target gas output module to output the first target gas. In this embodiment, by connecting the first target gas output module to the second gas outlet, the oxygen concentration in the first target gas and the flow rate of the first target gas can be better controlled.

[0242] As an optional embodiment, the method further includes adjusting the opening of a flow control valve on the hypoxic gas output device based on a current oxygen concentration detected by an oxygen concentration sensor on the hypoxic gas output device and a target oxygen concentration of the hypoxic gas. For example, a larger opening of the flow control valve on the hypoxic gas output device results in a lower nitrogen concentration in the third target gas and a higher flow rate, and so on.

[0243] As an optional embodiment, the method further includes adjusting the opening of a speed control valve on the first target gas output module based on a current oxygen concentration detected by an oxygen concentration sensor on the first target gas output module and a target oxygen concentration of the oxygen-enriched gas. For example, a larger opening of the speed control valve on the first target gas output module results in a lower oxygen concentration in the first target gas and a higher nitrogen concentration in the third target gas, and so on.

[0244] As an optional embodiment, when a pressure differential unit is provided on the first target gas output module, the method further includes: detecting the pressure of the first target gas based on the pressure differential unit, and using the pressure differential unit to control the opening of the speed control valve on the first target gas output module based on the pressure of the first target gas. The pressure differential unit on the first target gas output module can monitor the pressure of the first target gas during output. The pressure differential unit can also automatically control the opening of the speed control valve by obtaining a pre-set pressure value and combining it with the output pressure of the first target gas it monitors to achieve the desired output pressure of the first target gas.

[0245] As an optional embodiment, the third target gas is used as a curing shielding gas in the post-processing of 3D printing, while the first target gas is used to supply oxygen for the printing process. Through the method of this embodiment, both oxygen-rich gas and oxygen-deficient gas can be prepared simultaneously. The oxygen-rich gas can be used in the 3D printing process (front-end) of the 3D printing system, while the oxygen-deficient gas can be used in the post-processing (post-curing process) of the 3D printing system, thus achieving a closed-loop 3D printing system and improving efficiency.

[0246] Based on the above embodiments and optional embodiments, the present application proposes an optional implementation method, which is described below.

[0247] Figure 9 is a schematic diagram of a gas supply assembly according to an optional embodiment of the present application. As shown in Figure 9, the gas supply assembly is mainly divided into two channels, including a channel for preparing low-oxygen gas, a channel for preparing oxygen-rich gas, and a nitrogen circulation channel. The main components involved include a 1# speed regulating valve, a 1# check valve, a filter, an air compressor, a separation valve, a molecular sieve column, a 2# speed regulating valve, a 2# check valve, a 3# speed regulating valve, a 3# check valve, an on-off valve, an oxygen concentration flow sensor, and a nitrogen concentration flow sensor. The following describes the connection of each channel and the specific functions of the components.

[0248] (1) Preparation of oxygen-rich gas channel

[0249] The prepared oxygen-rich gas channel flows through: 1# speed regulating valve, 1# check valve, filter, air compressor, cooling system, separation valve, molecular sieve tower, flow limiting ring, 2# check valve, 2# speed regulating valve, and oxygen concentration flow sensor.

[0250] 1) 1# speed regulating valve

[0251] Air enters from port 1 of the 1# speed regulating valve and flows out from port 2. The function of the 1# speed regulating valve is to limit the air entry speed. The smaller the regulated flow rate, the smaller the output oxygen-rich gas flow rate and the higher the oxygen concentration.

[0252] 2) 1# one-way valve

[0253] After passing through the 1# speed regulating valve, the air flows from port 1 to port 2 of the 1# one-way valve. The function of the 1# one-way valve is to provide a channel for air to only enter but not exit, while limiting the nitrogen in the nitrogen circulation channel from being discharged from the air inlet.

[0254] 3) Filter

[0255] After passing through the 1# one-way valve, the low-concentration nitrogen in the air and nitrogen circulation channel flows into the filter. The function of the filter is to filter the dust and water vapor in the air, which can effectively increase the life of the molecular sieve tower.

[0256] 4) Air compressor

[0257] After the clean and dry gas passes through the filter, it is pressurized and accelerated by the air compressor at port 1 and flows through port 2. The function of the air compressor is to increase the gas pressure and increase the air flow rate.

[0258] 5) Cooling system

[0259] After being pressurized and accelerated, the air flows from port 1 to port 2 of the cooling system. Since the air is pressurized, its temperature rises. The function of the cooling system is to lower the temperature of the air to ensure that the temperature of the output nitrogen and oxygen-rich gas is not too high.

[0260] 6) Separation valve

[0261] After passing through the cooling system, the cooled air enters the separation valve, which is a two-position, four-way valve. The valve body's channel switching logic switches the first port 1 to 2 while simultaneously connecting ports 3 to 4. The second switch connects ports 1 to 3 while simultaneously connecting ports 2 to 4 (cross-connection). The separation valve's function is to alternately switch the gas path, circulating pressurized air into the molecular sieve tower while simultaneously discharging the gas inside the tower. After passing through the separation valve, the pressurized gas enters the molecular sieve tower through ports 1 and 2, and exits through ports 3 and 4. By switching the separation valve, the adsorbed nitrogen is discharged from ports 1 and 2 of the molecular sieve tower.

[0262] 7) Molecular sieve tower

[0263] The molecular sieve tower is designed to adsorb nitrogen from the air during pressurization. The remaining unabsorbed oxygen-rich gas is collected and purified to become high-purity oxygen-rich gas. During decompression, the molecular sieve transfers the adsorbed nitrogen from ports 1 and 2 of the molecular sieve tower through ports 2 and 3 of the separation valve, and then to port 4, where it is discharged back into the ambient air. During the next pressurization, it can adsorb nitrogen again and produce oxygen-rich gas. The entire process is a periodic dynamic cycle.

[0264] There are multiple adsorption molecular sieves in the molecular sieve. Adding a pressure equalization process during the adsorption process can further improve the recovery rate of oxygen-rich gas and reduce energy consumption. Taking the process of the adsorption molecular sieve tower on the left as an example, the cycle operation sequence is as follows:

[0265] 1. Pressurization / adsorption: The raw gas enters the adsorption molecular sieve tower on the left for pressurization, and the molecular sieve adsorbs nitrogen to produce oxygen-rich gas;

[0266] 2. Pressure equalization: Due to the effect of the flow limiting ring and the connection of the output ports of the left and right molecular sieve towers 3 and 4, the left molecular sieve tower equalizes the pressure of the right molecular sieve tower, so that the gas discharged from the left molecular sieve tower after decompression is effectively utilized;

[0267] 3. Venting: The left molecular sieve tower is depressurized for desorption, the adsorbed nitrogen is discharged, and the molecular sieve is regenerated, thereby realizing the recycling of the molecular sieve;

[0268] 4. Flushing: Use part of the product gas separated by the right molecular sieve tower to flush the vented left molecular sieve tower to remove the residual nitrogen in the adsorbent, improve the regeneration ability of the molecular sieve, and enhance the adsorption performance of nitrogen;

[0269] 5. Pressure equalization: Due to the effect of the flow limiting ring and the connection of the output ports of the left and right molecular towers 3 and 4, the right molecular sieve tower and the left molecular sieve tower are pressure-equalized, so that the gas discharged from the right molecular sieve tower after decompression is effectively utilized.

[0270] 8) Current limiting ring

[0271] After the oxygen-rich gas is output from ports 3 and 4 of the molecular sieve, it enters the flow-limiting ring. The function of the flow-limiting ring is to increase the pressure inside the molecular tower and thus increase the oxygen concentration in the output oxygen-rich gas.

[0272] 9) 2# one-way valve

[0273] After passing through the flow limiting ring, the oxygen-rich gas flows from port 1 to port 2 of the 2# one-way valve. The function of this one-way valve is to further increase the pressure inside the molecular tower, thereby increasing the oxygen concentration of the output oxygen-rich gas and preventing the oxygen-rich gas from flowing back and being discharged.

[0274] 10) 2# speed regulating valve

[0275] After passing through the 2# one-way valve, the oxygen-rich gas flows from port 1 to port 2 of the 2# speed regulating valve. The function of this valve is to limit the output flow of the oxygen-rich gas. Adjusting the speed regulating valve can adjust the output concentration of both the oxygen-rich gas and the nitrogen.

[0276] Among them, a pressure differential unit can also be provided in the above-mentioned oxygen-enriched gas preparation channel. Figure 10 is a schematic diagram of an oxygen-enriched gas preparation component provided according to an optional embodiment of the present application. As shown in Figure 10, the component includes: a filter, a compressor, a separation valve, a molecular sieve column, a flow limiting ring, a speed regulating valve, and a pressure differential unit. The following describes the process of preparing oxygen-enriched gas based on the oxygen-enriched gas preparation component.

[0277] Air flows into the filter, which removes dust and moisture from the air. Dust and moisture significantly affect the efficiency of the molecular sieve in producing oxygen-enriched gas. Therefore, the filter can effectively extend the life of the molecular sieve column. After passing through the filter, the clean, dry air is pressurized and accelerated by an air compressor, which increases the pressure and flow rate. After this pressurization and acceleration, the air enters the cooling system. Since the pressurized air temperature rises, the cooling system cools it down to ensure that the output oxygen-enriched gas temperature does not exceed 50%. After passing through the cooling system, the cooled air enters the separation valve, a two-position, four-way valve. Port 1 is the air inlet, ports 2 and 3 are the ports connecting to the molecular sieve column, and port 4 is the exhaust. The valve's channel switching logic switches port 1 to port 2 and port 3 to port 4 at the first switch. The second switch switches port 1 to port 3 and port 2 to port 4 at the second switch. The separation valves alternately switch the gas flow path, circulating pressurized air into the molecular sieve tower while simultaneously discharging the gas from within. After passing through the separation valves, the pressurized air enters the two inner chambers of the molecular sieve tower. The adsorbed nitrogen is discharged from the tower's air inlet as the separation valves switch. The molecular sieve tower adsorbs nitrogen from the air during pressurization, collecting the remaining unabsorbed oxygen-rich gas for purification to produce high-purity oxygen-rich gas. During depressurization, the molecular sieve releases the adsorbed nitrogen from the molecular sieve tower through the separation valve and returns it to the ambient air. Upon the next pressurization, it can adsorb nitrogen again to produce oxygen-rich gas, a process that occurs in a cyclical, dynamic cycle. After exiting the molecular sieve, the oxygen-rich gas enters a flow restriction ring, which raises the pressure within the molecular sieve tower, thereby increasing the concentration of the output oxygen-rich gas. After passing through the flow restriction ring, the oxygen-rich gas enters a check valve, which further raises the pressure within the molecular sieve tower, thereby increasing the concentration of the output oxygen-rich gas while preventing backflow and discharge. Figure 11 is a schematic diagram of air pressure feedback control according to an optional embodiment of the present application. As shown in Figure 11, oxygen-enriched gas flows through an electric speed control valve and a pressure differential unit. The pressure differential unit detects the output pressure of the oxygen-enriched gas and feeds it back to the electric speed control valve to adjust the flow rate in real time, thereby changing the output pressure. The electric speed control valve regulates the flow rate of the pipeline, while the pressure differential unit monitors the air pressure in real time, achieving closed-loop pressure feedback and regulation.

[0278] The oxygen-rich gas prepared based on the above-mentioned oxygen-rich gas preparation component can meet the high oxygen concentration requirements in photocuring 3D printing, and can control the oxygen concentration and flow rate, and accurately control the gas concentration and flow rate. The oxygen concentration control accuracy reaches 1%, and the gas flow rate control accuracy reaches 0.01L / min. The above-mentioned oxygen-rich gas preparation component can feedback the gas concentration, and control and adjust the gas concentration, flow rate, and air pressure according to the feedback, so that the oxygen concentration is distributed according to the needs of 3D printing, realizing closed-loop control. At the same time, the above-mentioned oxygen-rich gas preparation component is provided with a special drying module at the gas input end to dry the input air. After the air compressor compresses the air, the drying module can be added or reduced according to the service life to ensure that the moisture content of the air input by the molecular sieve is extremely low, so as to ensure that the service life meets the requirements.

[0279] Therefore, the use of the above-mentioned preparation of oxygen-enriched gas components can realize the requirements for oxygen concentration, flow rate and air pressure in the oxygen-enriched gas in light-curing 3D printing, which can reduce the adhesion without affecting the printing accuracy, and can realize precise adjustment of the oxygen concentration, flow rate and air pressure in the oxygen-enriched gas, and can adapt to the use of various material trays and platforms without causing accuracy or other impacts, while meeting the requirements for service life.

[0280] (2) Preparation of low oxygen gas channel

[0281] Prepare the low-oxygen gas channel flowing through: 1# speed regulating valve, 1# one-way valve, filter, air compressor, cooling system, separation valve, molecular sieve tower, separation valve, 3# one-way valve, 3# speed regulating valve, nitrogen concentration flow sensor.

[0282] On the basis of the above-mentioned preparation of oxygen-rich gas channel, the 4th port of the separation valve is connected. The 4th port of the separation valve is used to discharge the nitrogen adsorbed on the molecular tower. Part of the nitrogen returns to the filter through the nitrogen circulation channel, and part of the nitrogen flows to the 3# one-way valve, flowing from port 1 to port 2 of the 3# one-way valve. The function of the 3# one-way valve is to prevent the backflow of low-oxygen gas and the entry of air from the low-oxygen gas output port. After passing through the 3# one-way valve, the low-oxygen gas flows from port 1 to port 2 of the 3# speed regulating valve, and finally outputs the low-oxygen gas. The function of the 3# speed regulating valve is to control the flow rate of the low-oxygen gas output and adjust the output concentration of the oxygen-rich gas.

[0283] (3) Nitrogen circulation channel

[0284] The nitrogen circulation channel flows through: molecular sieve tower, separation valve, switch valve, filter, air compressor, cooling system, molecular sieve tower.

[0285] The nitrogen circulation channel recirculates nitrogen output from the separation valve back into the oxygen-enriched gas preparation channel, further increasing the nitrogen concentration in the hypoxic gas output channel. The #1 check valve restricts the discharge of refluxed nitrogen, ensuring it is not discharged through the air inlet channel. The #3 check valve increases the internal pressure of the nitrogen circulation channel, ensuring that some nitrogen re-enters the oxygen-enriched gas preparation channel and some is output to the hypoxic gas output port.

[0286] The following describes methods for preparing oxygen-rich gas, preparing low-oxygen gas, and preparing oxygen-rich gas and low-oxygen gas simultaneously based on the above-mentioned gas supply assembly.

[0287] (1) Preparation of oxygen-rich gas

[0288] Start the machine, fully open the 1# speed regulating valve and the 3# speed regulating valve, close the switch valve of the nitrogen circulation channel, and obtain oxygen-rich gas with different flow rates and concentrations by adjusting the 2# speed regulating valve and monitoring the oxygen concentration flow sensor.

[0289] (2) Preparation of low-oxygen gas

[0290] Start the machine and open the switch valve of the nitrogen circulation channel. The flow rate of the 3# speed regulating valve remains unchanged. The smaller the flow rate of the 1# speed regulating valve and the 2# speed regulating valve, the greater the nitrogen concentration of the low-oxygen gas and the smaller the flow rate; the larger the flow rate of the 1# speed regulating valve and the 2# speed regulating valve, the smaller the nitrogen concentration of the low-oxygen gas and the larger the flow rate; the flow rate of the 1# speed regulating valve and the 2# speed regulating valve remains unchanged, the smaller the flow rate of the 3# speed regulating valve, the greater the nitrogen concentration of the low-oxygen gas.

[0291] (3) Simultaneous preparation of oxygen-rich gas and low-oxygen gas

[0292] Start the machine, open the switch valve of the nitrogen circulation channel, fully open the 1# speed control valve, the larger the flow of the 2# speed control valve, the lower the oxygen concentration of the oxygen-rich gas, and the higher the nitrogen concentration of the low-oxygen gas; the smaller the flow of the 2# speed control valve, the higher the oxygen concentration of the oxygen-rich gas, and the lower the nitrogen concentration of the low-oxygen gas; the larger the flow of the 3# speed control valve, the lower the nitrogen concentration of the low-oxygen gas, and the higher the oxygen concentration of the oxygen-rich gas; the smaller the flow of the 3# speed control valve, the higher the nitrogen concentration of the low-oxygen gas, and the lower the oxygen concentration of the oxygen-rich gas.

[0293] In summary, the optional embodiment of the present invention adds a gas path connecting the exhaust port of the separation valve, adds a one-way valve and a speed regulating valve, and circulates the air through the molecular tower for a second time, thereby obtaining a low-oxygen gas with a high nitrogen concentration. The gas supply assembly provided by the optional embodiment of the present application can output low-oxygen gas with a high nitrogen concentration while also outputting oxygen-rich gas with a high oxygen concentration. It is suitable for three application scenarios: preparing oxygen-rich gas, preparing low-oxygen gas, and preparing oxygen-rich gas and low-oxygen gas at the same time. The concentration and flow rate of the output oxygen and nitrogen can be adjusted. In addition, the gas supply assembly provided by the optional embodiment of the present application has no consumables during its service life, does not require part replacement, and has high gas supply stability. Figure 12 is a schematic diagram comparing the curing efficiency of the gas supply assembly assisted 3D printing curing process and the traditional curing method according to the optional embodiment of the present application. It can be seen that the curing efficiency of nitrogen supplied by the nitrogen tank is the highest, close to 94%, followed by the low-oxygen gas curing provided by the gas supply assembly provided by the optional embodiment of the present application. The curing efficiency is second only to the curing efficiency of nitrogen supplied by the nitrogen tank, with an efficiency of close to 92%. The curing efficiency of special reagents, water, air, etc. is relatively low. The gas supply assembly provided in the optional embodiment of the present application provides low-oxygen gas curing, which is a safe, convenient, low-cost and efficient curing method compared to other curing methods.

[0294] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0295] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0296] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0297] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0298] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0299] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0300] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A 3D printing system, comprising: 3D printer, controller and gas separation device, wherein: The controller is in communication with the 3D printer and is configured to control the 3D printer to perform 3D printing; The controller is also in communication with the gas separation device and is configured to generate control instructions according to a preconfigured control strategy and send them to the gas separation device; The gas separation device is configured to separate the first target gas from the air received from the outside based on the received control instruction, so as to deliver the first target gas to the 3D printer.

2. The system according to claim 1, wherein: The control strategy is configured as: In response to a user-triggered start-up operation or a timed start-up operation, a first control instruction is generated and sent to the gas separation device; wherein the first control instruction includes starting the operation of delivering a first target gas; In response to a user-triggered shutdown operation or a timed shutdown operation, a second control instruction is generated and sent to the gas separation device; wherein the second control instruction includes an operation of stopping the delivery of the first target gas.

3. The system according to claim 1, wherein: The control strategy is configured as: When it is detected that the 3D printer enters the working state, a first control instruction is generated and sent to the gas separation device; wherein the first control instruction includes starting the operation of delivering the first target gas; When it is detected that the 3D printer exits the working state, a second control instruction is generated and sent to the gas separation device; wherein the second control instruction includes stopping the operation of delivering the first target gas.

4. The system according to claim 3, wherein: The control strategy is configured as: When detecting one or more of the following: the 3D printer is turned on, the light source of the 3D printer starts to be exposed, the molding platform of the 3D printer moves for the nth time, a printing task start instruction is received, and the printing material of the 3D printer reaches a preset position, determining that the 3D printer enters a working state; When it is detected that the 3D printer is turned off, the light source of the 3D printer stops exposing, the molding platform of the 3D printer moves for the mth time, a printing task stop instruction is received, and the printing material of the 3D printer is lower than a preset position, it is determined that the 3D printer has exited the working state; wherein m and n are integers, and m is greater than n.

5. The system according to claim 1, wherein: The control strategy is configured as: When it is detected that the release film of the 3D printer is higher than a preset calibration position, the air pressure of the first target gas in the 3D printer is higher than a preset air pressure range, the airflow of the first target gas in the 3D printer is higher than a preset range, the concentration of the first target gas in the 3D printer is higher than a preset concentration range, and the bearing force of the lower surface of the release film of the 3D printer is greater than the bearing force of the upper surface, a third control instruction is generated and sent; wherein the third control instruction includes controlling the gas delivered by the gas separation device to reduce one or more of the following; When it is detected that the release film of the 3D printer is lower than a preset calibration position, the air pressure of the first target gas in the 3D printer is lower than a preset air pressure range, the airflow of the first target gas in the 3D printer is lower than a preset range, the concentration of the first target gas in the 3D printer is lower than a preset concentration range, and the upper surface bearing force of the release film of the 3D printer is less than the lower surface bearing force, a fourth control instruction is generated and sent; wherein, the fourth control instruction includes controlling the increase of gas delivered by the gas separation device.

6. The system according to claim 1, wherein: The gas separation device is built into the 3D printer or is independently arranged apart from the 3D printer.

7. The system according to claim 2 or 3, wherein: The gas separation device comprises: an air receiving device, a gas separation module, and a first target gas output module, wherein: The air receiving device is configured to receive and respond to a control instruction from the controller, wherein when the air receiving device receives the first control instruction, it starts to receive air from the outside, and when the air receiving device receives the second control instruction, it stops receiving air from the outside; The gas separation module is configured to separate air to obtain the first target gas and transport it to the first target gas output module; The first target gas output module is configured to output the first target gas to the 3D printer upon receiving the first target gas.

8. The system according to claim 7, wherein: The first target gas output module is provided with a pressure difference unit, and the pressure difference unit is configured to detect the first target gas. The gas pressure is then sent to the controller.

9. The system according to claim 7, wherein: The first target gas output module is provided with a gas concentration sensor, and the gas concentration sensor is configured to detect the first target gas concentration and send it to the controller.

10. The system according to claim 5, wherein: The 3D printer includes a material tray, a release film and an inflation cavity arranged at the bottom of the material tray, the release film is arranged above the inflation cavity, the inflation cavity is arranged to accommodate the first target gas, and a position sensor is arranged on the material tray, and the position sensor is arranged to detect the position data of the release film and send it to the controller.

11. The system according to claim 7, wherein: The gas separation device includes one or more of a nitrogen adsorption module and a nitrogen separation module.

12. The system according to claim 11, wherein: The first target gas includes oxygen-rich gas, and the gas separation module includes a nitrogen adsorption module; The nitrogen adsorption module is connected to the first target gas output module, and the nitrogen adsorption module is configured to deliver the remaining gas after nitrogen adsorption to the first target gas output module.

13. The system according to claim 12, wherein: The nitrogen adsorption module is provided with an oxygen-rich gas outlet, wherein the nitrogen adsorption module is configured to release the high-pressure adsorbed nitrogen after discharging the remaining gas after nitrogen adsorption through the oxygen-rich gas outlet, and to perform the next nitrogen adsorption after mixing the released gas with the air received from the outside.

14. The system according to claim 13, wherein: The nitrogen adsorption module includes a separation valve and a molecular sieve tower, wherein: The separation valve is configured to control the gas flow route in the nitrogen adsorption module, wherein the separation valve is provided with an air inlet configured to receive air, a vent configured to allow air to flow to the molecular sieve tower, and an exhaust port configured to exhaust residual gas; The molecular sieve tower is configured to perform high-pressure adsorption on nitrogen in the air, obtain residual gas after high-pressure adsorption, and release the high-pressure adsorbed nitrogen.

15. The system of claim 13, wherein: The gas separation device further includes: a flow limiting ring, wherein the flow limiting ring is used to limit the flow rate of the first target gas when it is discharged from the oxygen-rich gas outlet.

16. The system of claim 14, wherein: At least two molecular sieve towers are provided, and the vent of the separation valve is configured to switch between the at least two molecular sieve towers.

17. The system of claim 16, wherein: The molecular sieve tower includes a first molecular sieve tower and a second molecular sieve tower, and the vent of the separation valve includes a first vent and a second vent, the first vent is connected to the first molecular sieve tower, and the second vent is connected to the second molecular sieve tower.

18. The system of claim 17, wherein: In a first state, the separation valve controls the air inlet to be connected to the first air vent, and the second air vent to be connected to the exhaust port; In the second state, the separation valve controls the air inlet to be connected to the second air vent, and the first air vent to be connected to the exhaust port; The separation valve is cyclically switched between the first state and the second state according to a predetermined period.

19. The system of claim 17, wherein: When the first molecular sieve tower performs high-pressure adsorption on nitrogen in the air, the second molecular sieve tower performs pressure equalization on the first molecular sieve tower, so as to cause the first molecular sieve tower to reduce pressure and release the nitrogen adsorbed under high pressure; When the second molecular sieve tower performs high-pressure adsorption on nitrogen in the air, the first molecular sieve tower performs pressure equalization on the second molecular sieve tower, so as to cause the second molecular sieve tower to reduce pressure and release the nitrogen adsorbed under high pressure.

20. The system of claim 7, wherein: The gas separation device further comprises a regulating component, wherein the regulating component is configured to limit a flow rate and / or a direction of the first target gas when it is delivered to the first target gas output module.

21. The system of claim 20, wherein: The regulating component includes one or more of a flow limiting ring, a speed regulating valve, a pressure regulating valve, a one-way valve, and a flow limiting valve.

22. The system of claim 7, wherein: The air receiving device is provided with a speed regulating valve and / or a one-way valve.

23. The system of claim 1, wherein: The gas separation device further comprises: a filter, an oil-free air compressor and a cooling unit, wherein: The filter is configured to filter dust and water vapor in the air to obtain filtered air; The oil-free air compressor is configured to increase the gas pressure of the filtered air and increase the gas flow rate of the filtered air to obtain compressed air; The cooling unit is configured to cool the compressed air to obtain processed air.

24. The system of claim 7, wherein: The system further comprises: a residual gas reflux channel and a low-oxygen gas output device, wherein: The gas separation device is further used to separate oxygen from the second target gas reflowing in the external air and / or residual gas reflow channel to obtain a third target gas; The residual gas reflux channel is used to reflux the second target gas to the air receiving device; The low-oxygen gas output device is used to output the third target gas when receiving the third target gas.

25. The system according to claim 24, characterized in that The gas separation device is provided with a first gas outlet and a second gas outlet, and the second target gas is discharged through the first gas outlet and flows to the air pretreatment device through the residual gas reflux channel.

26. The system according to claim 25, characterized in that The first target gas output module is used to receive and output the first target gas separated by the gas separation device and discharged from the second gas outlet.

27. The system according to claim 26, characterized in that The first target gas output module is provided with a speed regulating valve for opening the oxygen-rich gas output channel.

28. The system according to claim 26, characterized in that The first target gas output module is provided with an oxygen concentration sensor, and the oxygen concentration sensor is used to detect the oxygen concentration of the received first target gas.

29. The system according to claim 26, characterized in that The first target gas output module is provided with a one-way valve for controlling the air flow direction.

30. The system according to claim 8, characterized in that The pressure difference unit is further used to control the opening of the speed regulating valve on the first target gas output module based on the gas pressure of the first target gas.

31. The system according to claim 26, characterized in that The gas separation device is used to perform high-pressure adsorption on nitrogen in the air received by the air receiving device, and discharge the first target gas remaining after the high-pressure adsorption from the second gas outlet; And after the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain the second target gas, so that the second target gas flows back to the gas separation device through the residual gas reflux channel for circulation treatment.

32. The system according to claim 24, characterized in that The low oxygen gas output device is provided with a speed regulating valve for opening the low oxygen gas output channel.

33. The system according to claim 24, characterized in that The hypoxic gas output device is provided with an oxygen concentration sensor, and the oxygen concentration sensor is used to detect the oxygen concentration of the received third target gas.

34. The system according to claim 24, characterized in that The hypoxic gas output device is provided with a one-way valve for controlling the air flow direction.

35. The system of claim 24, wherein: The air receiving device is provided with a speed regulating valve for adjusting the air inflow speed and / or a one-way valve for controlling the air flow direction.

36. The system of claim 24, wherein: The residual gas reflux channel is provided with a switch valve, wherein the switch valve is used to open the residual gas reflux channel.

37. A 3D printing method, executed by a controller, comprising: A control instruction is generated according to a preconfigured control strategy and sent to the gas separation device, so that the gas separation device separates the first target gas from the air received from the outside based on the received control instruction, and delivers it to the 3D printer.

38. The method according to claim 37, characterized in that The gas separation device separates the first target gas from the air received from the outside based on the received control instruction to deliver the first target gas to the 3D printer, including: An air receiving device is used to receive outside air, and the received air is conducted to the air pre-treatment device; The air pre-treatment device is used to treat the air received by the air receiving device to obtain treated air, and the treated air is conducted to the gas separation device; The gas separation device is used to perform high-pressure adsorption on the nitrogen in the treated air, and the remaining part of the first target gas after the high-pressure adsorption is discharged from the second gas outlet to be transported to the 3D printer.

39. The method according to claim 38, characterized in that In the case where the second gas outlet of the gas separation device is connected to a first target gas output module, and a speed regulating valve is provided on the first target gas output module, the method further includes: When the oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration, the speed regulating valve on the first target gas output module is opened to output the first target gas.

40. The method according to claim 39, characterized in that The method further comprises: According to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the first target gas output module, the openings of the speed regulating valve on the air receiving device and the speed regulating valve on the first target gas output module are adjusted.

41. The method according to claim 39, characterized in that In the case where a pressure difference unit is provided on the first target gas output module, the method further includes: The pressure of the first target gas is detected based on the pressure difference unit, and the speed regulating valve on the first target gas output module and the opening of the speed regulating valve on the air receiving device are controlled by the pressure difference unit based on the pressure of the first target gas.

42. The method according to any one of claims 37 to 41, characterized in that The first target gas is used to supply oxygen for the printing process of 3D printing.

43. The method according to claim 38, characterized in that The method further comprises: After the portion of the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain a second target gas; Using a residual gas reflux channel to reflux the second target gas to the air pretreatment device, and combining it with the air received from the air receiving device for circulation treatment; An oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel is used to detect the oxygen concentration in the second target gas after the circulation treatment; When the oxygen concentration sensor detects that the current oxygen concentration is the target oxygen concentration, a third target gas is obtained, and the speed regulating valve on the low oxygen gas output device is opened to output the third target gas.

44. The method according to claim 43, characterized in that The method further comprises: According to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device, the openings of the speed regulating valve on the air receiving device and the speed regulating valve on the hypoxic gas output device are adjusted.

45. The method according to claim 43, characterized in that The method further comprises: When a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, the opening of the speed regulating valve on the first target gas output module is adjusted according to the current concentration and target oxygen concentration detected by the oxygen concentration sensor on the low oxygen gas output device.

46. ​​The method according to any one of claims 43 to 45, characterized in that The third target gas is used as a curing protection gas for post-processing of 3D printing.

47. An air supply assembly, characterized in that: include: An air receiving device, a gas separation device, a residual gas reflux channel, and a low-oxygen gas output device, wherein: The air receiving device is used to receive external air; The gas separation device is used to separate oxygen from the second target gas reflowing in the external air and / or residual gas reflow channel to obtain a third target gas; The residual gas reflux channel is used to reflux the second target gas to the air receiving device; The low-oxygen gas output device is used to output the third target gas when receiving the third target gas.

48. The air supply assembly according to claim 47, characterized in that It also includes an air pre-treatment device, wherein the air outlet of the air receiving device is communicated with the air inlet of the air pre-treatment device, and the air outlet of the air pre-treatment device is communicated with the air inlet of the gas separation device.

49. The air supply assembly according to claim 48, characterized in that The air pretreatment device comprises: a filter, an air compressor and a cooling unit, wherein: The filter is used to remove dust and water vapor in the air received by the air receiving device to obtain filtered air; The air compressor is used to increase the gas pressure of the filtered air and increase the gas flow rate of the filtered air to obtain compressed air; The cooling unit is used to cool the compressed air to obtain the processed air.

50. The air supply assembly according to claim 48, characterized in that The gas separation device is provided with a first gas outlet and a second gas outlet, and the second target gas is discharged through the first gas outlet and flows to the air pretreatment device through the residual gas reflux channel.

51. The air supply assembly according to claim 50, characterized in that It also includes a first target gas output module for receiving and outputting the first target gas separated by the gas separation device and discharged from the second gas outlet.

52. The air supply assembly according to claim 51, characterized in that The first target gas output module is provided with a speed regulating valve for opening the oxygen-rich gas output channel.

53. The air supply assembly according to claim 51, characterized in that The first target gas output module is provided with an oxygen concentration sensor, and the oxygen concentration sensor is used to detect the oxygen concentration of the received first target gas.

54. The air supply assembly according to claim 51, characterized in that The first target gas output module is provided with a one-way valve for controlling the air flow direction.

55. The air supply assembly according to claim 51, characterized in that The first target gas output module is provided with a pressure difference unit, and the pressure difference unit is used to detect the gas pressure of the first target gas and control the opening of the speed regulating valve on the first target gas output module based on the gas pressure of the first target gas.

56. The air supply assembly according to claim 51, characterized in that The gas separation device is used to perform high-pressure adsorption on nitrogen in the air received by the air receiving device, and discharge the first target gas remaining after the high-pressure adsorption from the second gas outlet; And after the first target gas is discharged, the high-pressure adsorbed nitrogen is released to obtain the second target gas, so that the second target gas flows back to the gas separation device through the residual gas reflux channel for circulation treatment.

57. The air supply assembly according to claim 56, characterized in that The gas separation device comprises: a separation valve, a molecular sieve tower and a flow limiting ring, wherein: The separation valve is used to control the gas flow route in the gas separation device, wherein the separation valve is provided with an air inlet for receiving the treated air, a vent for the treated air to flow to the molecular sieve tower, and an exhaust port for discharging the residual gas; The molecular sieve tower is used to perform high-pressure adsorption on the nitrogen in the treated air, and after the first target gas remaining after the high-pressure adsorption is discharged from the second gas outlet, the high-pressure adsorbed nitrogen is released to obtain the second target gas; The flow limiting ring is used to limit the flow rate of the first target gas when it is discharged from the second gas outlet.

58. The air supply assembly according to claim 57, characterized in that When the molecular sieve tower includes a first molecular sieve tower and a second molecular sieve tower, and the vent of the separation valve includes a first vent and a second vent, the first vent is connected to the first molecular sieve tower, and the second vent is connected to the second molecular sieve tower.

59. The air supply assembly according to claim 58, characterized in that In a first state, the separation valve controls the air inlet to be connected to the first air vent, and the second air vent to be connected to the exhaust port; In the second state, the separation valve controls the air inlet to be connected to the second air vent, and the first air vent to be connected to the exhaust port; The separation valve is cyclically switched between the first state and the second state according to a predetermined period.

60. The air supply assembly according to claim 58, characterized in that The first molecular sieve tower and the second molecular sieve tower are connected through the limiting ring.

61. The air supply assembly according to claim 60, characterized in that When the first molecular sieve tower performs high-pressure adsorption on the nitrogen in the treated air, the second molecular sieve tower performs pressure equalization on the first molecular sieve tower, so as to cause the first molecular sieve tower to reduce pressure and release the nitrogen adsorbed at high pressure; When the second molecular sieve tower performs high-pressure adsorption on the nitrogen in the treated air, the first molecular sieve tower performs pressure equalization on the second molecular sieve tower, so as to cause the second molecular sieve tower to reduce the pressure and release the nitrogen adsorbed at high pressure.

62. The gas supply assembly of claim 47, wherein: The low-oxygen gas output device is provided with a speed regulating valve for opening the low-oxygen gas output channel.

63. The gas supply assembly according to claim 47, characterized in that The hypoxic gas output device is provided with an oxygen concentration sensor, and the oxygen concentration sensor is used to detect the oxygen concentration of the received third target gas.

64. The gas supply assembly of claim 47, wherein: The hypoxic gas output device is provided with a one-way valve for controlling the air flow direction.

65. The air supply assembly of claim 47, wherein: The air receiving device is provided with a speed regulating valve for adjusting the air inflow speed and / or a one-way valve for controlling the air flow direction.

66. The gas supply assembly of claim 47, wherein: The residual gas reflux channel is provided with a switch valve, wherein the switch valve is used to open the residual gas reflux channel.

67. A method for preparing gas, characterized in that: include: An air receiving device is used to receive outside air, and the received air is conducted to the air pre-treatment device; The air pre-treatment device is used to treat the air received by the air receiving device to obtain treated air, and the treated air is conducted to the gas separation device; Adsorbing the nitrogen in the treated air under high pressure by the gas separation device, and discharging the remaining part of the first target gas after the high pressure adsorption from the second gas outlet, and releasing the nitrogen adsorbed under high pressure after discharging the part of the first target gas to obtain the second target gas; Using a residual gas reflux channel to reflux the second target gas to the air pretreatment device, and combining it with the air received from the air receiving device for circulation treatment; An oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel is used to detect the oxygen concentration in the second target gas after the circulation treatment; When the oxygen concentration sensor detects that the current oxygen concentration is the target oxygen concentration, a third target gas is obtained, and the speed regulating valve on the low oxygen gas output device is opened to output the third target gas.

68. The method according to claim 67, characterized in that The method further comprises: According to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device, the openings of the speed regulating valve on the air receiving device and the speed regulating valve on the hypoxic gas output device are adjusted.

69. The method according to claim 68, characterized in that The method further comprises: When a first target gas output module is connected to the second gas outlet of the gas separation device and a speed regulating valve is provided on the first target gas output module, the opening of the speed regulating valve on the first target gas output module is adjusted according to the current concentration and target oxygen concentration detected by the oxygen concentration sensor on the low oxygen gas output device.

70. The method according to any one of claims 68 to 69, characterized in that The third target gas is used as a curing protection gas for post-processing of 3D printing.

71. A method for preparing gas, characterized in that: include: An air receiving device is used to receive outside air, and the received air is conducted to the air pre-treatment device; The air pre-treatment device is used to treat the air received by the air receiving device to obtain treated air, and the treated air is conducted to the gas separation device; The gas separation device is used to perform high-pressure adsorption on the nitrogen in the treated air, and the remaining part of the first target gas after the high-pressure adsorption is discharged from the second gas outlet.

72. The method according to claim 71, characterized in that In the case where the second gas outlet of the gas separation device is connected to a first target gas output module, and a speed regulating valve is provided on the first target gas output module, the method further includes: When the oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration, the speed regulating valve on the first target gas output module is opened to output the first target gas.

73. The method according to claim 72, characterized in that The method further comprises: According to the current oxygen concentration and the target oxygen concentration detected by the oxygen concentration sensor on the first target gas output module, the openings of the speed regulating valve on the air receiving device and the speed regulating valve on the first target gas output module are adjusted.

74. The method according to claim 72, characterized in that In the case where a pressure difference unit is provided on the first target gas output module, the method further includes: The pressure of the first target gas is detected based on the pressure difference unit, and the speed regulating valve on the first target gas output module and the opening of the speed regulating valve on the air receiving device are controlled by the pressure difference unit based on the pressure of the first target gas.

75. The method according to any one of claims 71 to 74, characterized in that The first target gas is used to supply oxygen for the printing process of 3D printing.

76. A method for preparing gas, characterized in that: include: An air receiving device is used to receive outside air, and the received air is conducted to the air pre-treatment device; The air pre-treatment device is used to treat the air received by the air receiving device to obtain treated air, and the treated air is conducted to the gas separation device; The gas separation device is used to perform high-pressure adsorption on the nitrogen in the treated air, and the remaining part of the first target gas after the high-pressure adsorption is discharged from the second gas outlet, and after the part of the first target gas is discharged, the high-pressure The adsorbed nitrogen is released to obtain a second target gas; Using a residual gas reflux channel to reflux the second target gas to the air pretreatment device, and combining it with the air received from the air receiving device for circulation treatment; An oxygen concentration sensor on a low-oxygen gas output device connected to the residual gas reflux channel is used to detect the oxygen concentration in the second target gas after the circulation treatment; When the oxygen concentration sensor on the hypoxic gas output device detects that the current oxygen concentration is the target oxygen concentration of the hypoxic gas, a third target gas is obtained, and the speed regulating valve on the hypoxic gas output device is opened to output the third target gas.

77. The method according to claim 76, characterized in that In the case where the second gas outlet of the gas separation device is connected to a first target gas output module, and a speed regulating valve is provided on the first target gas output module, the method further includes: When the oxygen concentration sensor on the first target gas output module detects that the current oxygen concentration is the target oxygen concentration of the oxygen-rich gas, the speed regulating valve on the first target gas output module is opened to output the first target gas.

78. The method according to claim 76, characterized in that The method further comprises: The opening of the speed regulating valve on the hypoxic gas output device is adjusted according to the current oxygen concentration detected by the oxygen concentration sensor on the hypoxic gas output device and the target oxygen concentration of the hypoxic gas.

79. The method according to claim 77, characterized in that The method further comprises: The opening of the speed regulating valve on the first target gas output module is adjusted according to the current oxygen concentration detected by the oxygen concentration sensor on the first target gas output module and the target oxygen concentration of the oxygen-rich gas.

80. The method according to claim 31, characterized in that In the case where a pressure difference unit is provided on the first target gas output module, the method further includes: The pressure of the first target gas is detected based on the pressure difference unit, and the opening of the speed regulating valve on the first target gas output module is controlled based on the pressure of the first target gas by using the pressure difference unit.

81. The method according to any one of claims 76 to 80, characterized in that The third target gas is used as a curing protection gas for post-processing of 3D printing, and the first target gas is used to supply oxygen for the printing process of the 3D printing.

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