A circulating ink supply system for a nozzle array and a control method thereof

Abstract

The present application relates to a circulating ink supply system for a nozzle array and a control method thereof, wherein the ink supply system includes an ink cartridge 1; an ink supply unit connected to the ink cartridge 1; a debubbling unit, wherein the debubbling unit includes a first debubbling component and a second debubbling component; multiple groups of ink storage units, wherein the ink storage units include an ink cartridge 2 and an ink processing component, wherein the ink cartridge 2 is connected to the ink cartridge 1 via the second debubbling component; multiple groups of nozzle modules, wherein the multiple groups of nozzle modules are respectively connected to multiple ink cartridges 2 via multiple groups of ink processing components; and multiple groups of reflux units, wherein the reflux unit includes an ink cartridge 3, wherein the ink inlet end of the ink cartridge 3 is connected to the nozzle module, and the ink outlet end of the ink cartridge 3 is connected to the nozzle module via the ink processing component. The present application collects excess ink in the nozzle module by setting the ink cartridge 3, and reuses the ink processing component to deliver the excess ink to the nozzle module. The reflux path is short, the temperature change of the reflux ink is small, the ink viscosity is more stable, and the printing effect is better.

Description

Technical Field

[0001] The present application relates to the technical field of inkjet printing and film making, and in particular to a circulating ink supply system for a nozzle array and a control method thereof. Background Art

[0002] Inkjet printing technology has been widely used in many traditional fields. In recent years, it has also been gradually applied to flexible devices such as OLED, RFID, thin-film solar cells, wearable flexible devices, PCBs, and smart skins. Flexible electronics manufacturing processes that combine flexible electronics with inkjet printing are gaining increasing attention.

[0003] In modern inkjet printing technology and equipment, especially in the manufacturing process of products such as flexible electronics, the ink supply and control system of the nozzle is one of the key components to achieve the desired printing effect. Specifically, in such applications, not only is it necessary to obtain higher-precision printing quality, but also because the inks used are usually very expensive and have low ink supply in actual use, or are corrosive, accordingly, on the one hand, it is necessary to achieve more reasonable and accurate ink supply and circulation processing to minimize the waste of special inks. On the other hand, it is also necessary to pre-fill the nozzle and ink supply pipeline with appropriate solution when turning on the nozzle, quickly eliminate residual bubbles in the pipeline and nozzle, and achieve efficient cleaning of the nozzle and its own system.

[0004] In related technologies, when supplying ink to a printhead module, a relatively small portion of the ink is ejected by the printhead module for printing, while a large amount of ink that enters the printhead module needs to be recollected. In the actual ink supply process, a main ink cartridge stores ink, and a debubbler is used to debubble the ink within the main cartridge. After debubbling, the ink in the main cartridge is delivered to the auxiliary ink cartridge, which then undergoes temperature regulation and other treatments before being delivered to the printhead module. Excess ink that enters the printhead module is returned to the main ink cartridge, thereby recycling the ink.

[0005] Due to the long distance between the printhead module and the main ink cartridge, the piping layout is complex, and the long-distance return ink flow is unstable and prone to generating a large number of bubbles. This increases the amount of bubbles in the ink in the main ink cartridge and increases the debubbling time. In addition, the long return distance of the temperature-regulated ink causes significant temperature fluctuations in the ink, requiring re-adjustment of the ink temperature when it is subsequently resupplied to the printhead module. Summary of the Invention

[0006] The embodiment of the present application provides a circulating ink supply system for a nozzle array and a control method thereof to solve the technical problems in the related art that the ink return path in the ink supply system is too long, the pipeline layout is difficult, the defoaming burden is increased, the ink temperature changes greatly, and the ink viscosity stability is poor.

[0007] In a first aspect, a circulating ink supply system for a nozzle array is provided, comprising:

[0008] Cartridge 1;

[0009] an ink supply unit, the ink supply unit being in communication with the ink cartridge 1 to supply ink to the ink cartridge 1;

[0010] a debubble unit, the debubble unit comprising a first debubble component and a second debubble component, the first debubble component being in communication with the ink cartridge 1 to remove bubbles from the ink in the ink cartridge 1;

[0011] Multiple ink storage units, each comprising a second ink cartridge and an ink processing assembly, wherein the second ink cartridge is connected to the first ink cartridge via the second debubbling assembly;

[0012] A plurality of groups of nozzle modules, each of which is connected to a plurality of ink cartridges 2 through a plurality of groups of ink processing components to supply ink to the nozzle modules;

[0013] Multiple groups of reflux units, the reflux units include ink cartridge three, the ink inlet end of the ink cartridge three is connected to the nozzle module to store excess ink entering the nozzle module, and the ink outlet end of the ink cartridge three is connected to the nozzle module through the ink processing component to supply ink to the nozzle module.

[0014] In some embodiments, the circulating ink supply system for the nozzle array further includes a waste liquid collection unit, wherein the waste liquid collection unit includes:

[0015] a waste liquid recovery station, wherein the nozzle module is suitable for spraying ink above the printing platform, and the waste liquid recovery station is used to collect waste liquid splashed or overflowed from the printing platform;

[0016] A waste liquid collection bottle is connected to the waste liquid recovery station and the ink cartridge.

[0017] In some embodiments, the circulating ink supply system for the nozzle array further includes a water cooling system connected to the nozzle module to control the temperature of the nozzle module, and the water cooling system includes:

[0018] a water tank, the water tank being used to store coolant;

[0019] Water pump 2;

[0020] a water-cooling plate, the water-cooling plate being connected to the water tank via the second water pump and the water-cooling plate being connected to the nozzle module to absorb heat from the nozzle module;

[0021] a heat exchanger, the heat exchanger being in communication with the water-cooled plate and the heat exchanger being in communication with the water tank;

[0022] Temperature sensor three, the temperature sensor three is arranged on the surface of the nozzle module to monitor the temperature of the nozzle module when it is working.

[0023] In some embodiments, the circulating ink supply system for the nozzle array also includes a high-voltage system, which is connected to the nozzle module. The high-voltage system includes a power supply and a high-voltage amplifier. The power supply is connected to the nozzle module through the high-voltage amplifier to provide voltage to the multiple nozzles of the nozzle module.

[0024] In some embodiments, the ink supply unit includes:

[0025] a remote ink supply mechanism, the remote ink supply mechanism being connected to the ink cartridge one via a solenoid valve one;

[0026] The ink cartridge ink supply mechanism includes an ink cartridge four, and the ink cartridge four is connected to the ink cartridge one through a solenoid valve four.

[0027] In some embodiments, the first debubbling assembly includes a water pump 1, a filter 1, a debubbler 1, and a solenoid valve 2, the ink cartridge 1 is connected to the filter 1 via the water pump 1, the filter 1 is connected to the debubbler 1, and the debubbler 1 is connected to the ink cartridge 1 via the solenoid valve 2;

[0028] The second debubble assembly includes a second debubble device and a plurality of third solenoid valves. The second debubble device is connected to the second ink cartridge. The second debubble device is connected to the second ink cartridge through the third solenoid valve.

[0029] In some embodiments, the ink processing component includes a flow meter 1, a temperature regulating part and a temperature sensor 1. The ink cartridge 2 is connected to the ink inlet pipe of the nozzle module through a solenoid valve 10. The ink cartridge 3 is connected to the ink inlet pipe of the nozzle module through a solenoid valve 5. The flow meter 1 and the temperature regulating part are both arranged at the ink inlet pipe of the nozzle module. The temperature sensor 1 is attached to the temperature regulating part to monitor the temperature of the temperature regulating part.

[0030] In some embodiments, the circulating ink supply system for the nozzle array also includes a positive pressure control system and a negative pressure control system, and the positive pressure control system and the negative pressure control system are both connected to the ink cartridge one, the ink cartridge two and the ink cartridge three through solenoid valves to control the pressure inside the ink cartridge one, the ink cartridge two and the ink cartridge three.

[0031] In some embodiments, two hydraulic sensors are provided in each of the ink cartridge 1, the ink cartridge 2, and the ink cartridge 3 to detect the upper limit and the lower limit of the liquid level in the ink cartridge 1, the ink cartridge 2, and the ink cartridge 3;

[0032] The ink cartridge 1, the ink cartridge 2 and the ink cartridge 3 are all equipped with an air pressure sensor to detect the air pressure inside the ink cartridge 1, the ink cartridge 2 and the ink cartridge 3.

[0033] In some embodiments, the circulating ink supply system for the nozzle array also includes a control module, which includes a host computer and a control board. The host computer is electrically connected to the control board, and the control board is electrically connected to the ink supply unit, the ink storage unit, the defoaming unit, the nozzle module and the reflux unit.

[0034] The beneficial effects of the technical solution provided by this application include:

[0035] The embodiment of the present application provides a circulating ink supply system for a printhead array. When the ink supply system is in operation, an ink supply unit supplies ink to a first ink cartridge, a first debubbling assembly debubbles the ink in the first ink cartridge, and then the ink in the first ink cartridge is debubbled for a second time by a second assembly and then supplied to a second ink cartridge. The ink in the second ink cartridge is treated by an ink processing assembly and then supplied to a printhead module. Excess ink supplied to the printhead module is collected in a third ink cartridge, and the ink in the third ink cartridge is re-supplied to the printhead module through the ink processing assembly. Therefore, the returned ink does not need to flow back to the first ink cartridge, shortening the return path and facilitating the arrangement of the piping. The returned ink has better stability, and since the return path is shorter, it is less likely to generate bubbles, so there is no need to set a debubbling device on the return path, simplifying the piping structure. The temperature of the ink in the third ink cartridge changes less, making it easier to adjust the ink to the desired temperature. When the ink is re-treated by the ink processing assembly, less energy is consumed, improving energy utilization and saving energy. In addition, the ink temperature is easier to control, resulting in good viscosity stability of the ink and better printing effect.

[0036] In a second aspect, a control method for a circulating ink supply system for a printhead array is provided. Based on the circulating ink supply system for a printhead array as described above, the control method utilizes a control module to control an ink supply unit, an ink storage unit, a defoaming unit, a printhead module, and a reflux unit, including the following control methods:

[0037] Ink refilling working condition: The ink supply unit supplies ink to ink cartridge 1, and the ink in ink cartridge 1 is processed by the defoaming unit and then supplied to ink cartridge 2;

[0038] Ink circulation working condition: Cut off the connection between ink cartridge 1 and ink cartridge 2, ink cartridge 2 supplies ink to the print head module through the ink processing assembly, part of the ink is ejected by the print head module, and the other part is collected in ink cartridge 3, which then resupplies the ink to the print head module through the ink processing assembly, thus realizing the ink circulation;

[0039] Inkjet printing conditions: monitor and adjust the ink flow supplied to the printhead module; adjust the temperature of the ink supplied to the printhead module; monitor the temperature of the ink temperature control unit and the internal temperature of the printhead module, and adjust the temperature of the ink temperature control unit; apply voltage to the printhead module during printing, and control the temperature of the printhead module;

[0040] Ink recovery working condition: collect waste liquid splashed or overflowed from the printing platform and introduce the waste liquid into a waste liquid collection bottle for collecting waste liquid; introduce the waste liquid in the ink cartridge three into the waste liquid collection bottle.

[0041] Another embodiment of the present application provides a control method for a circulating ink supply system for a nozzle array. Since the control method is based on the above-mentioned circulating ink supply system for a nozzle array, the beneficial effects of the control method for a circulating ink supply system for a nozzle array are consistent with the beneficial effects of the above-mentioned circulating ink supply system for a nozzle array, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A schematic diagram of a circulating ink supply system for a nozzle array provided in an embodiment of the present application;

[0044] Figure 2 A schematic diagram of an ink cartridge 1 and an ink storage unit provided in an embodiment of the present application;

[0045] Figure 3 Schematic diagram of the ink supply unit, ink cartridge 1, defoaming unit, ink storage unit, nozzle module and reflux unit provided in an embodiment of the present application;

[0046] Figure 4 Schematic diagram of the ink storage unit, reflux unit and nozzle module provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of a nozzle module and a waste liquid collection unit provided in an embodiment of the present application;

[0048] Figure 6 Schematic diagram of the water cooling system, high-pressure system and nozzle module provided in an embodiment of the present application;

[0049] Figure 7 A schematic diagram of an ink storage unit provided in an embodiment of the present application;

[0050] Figure 8A schematic diagram of a control module provided in an embodiment of the present application.

[0051] In the figure: 1001, positive pressure control system; 1002, negative pressure control system; 1003, solenoid valve six; 1004, solenoid valve seven; 1005, solenoid valve eight; 1006, air pressure sensor one; 1007, air pressure sensor two; 1008, air pressure sensor three; 2001, ink cartridge one; 2002, ink cartridge two; 2003, ink cartridge three; 2004, remote ink supply mechanism; 2005, ink cartridge four; 2006, waste liquid collection bottle; 2007, solenoid valve one; 2008, solenoid valve two; 2009, debubbler one; 2010, filter one; 2011, water pump one; 2012, liquid level sensor one; 2013, liquid level sensor two; 2014, debubbler two; 2015, solenoid valve three; 2016, liquid level sensor three; 2017, liquid level sensor 4; 2018, liquid level sensor 5; 2019, temperature adjustment component; 2020, temperature sensor 1; 2021, flow meter 1; 2022, nozzle module; 2023, temperature sensor 2; 2024, liquid level sensor 6; 2025, liquid level sensor 7; 2026, solenoid valve 5; 2027, solenoid valve 9; 2028, solenoid valve 4; 2029, solenoid valve 10; 3001, nozzle; 3002, printing platform; 3003, waste liquid recovery station; 4000, water cooling system; 4001, water tank; 4002, water pump 2; 4003, water cooling plate; 4004, heat exchanger; 4005, temperature sensor 3; 5000, high-voltage system; 5001, power supply; 5002, high-voltage amplifier; 6001, host computer; 6002, control board. DETAILED DESCRIPTION

[0052] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] The embodiment of the present application provides a circulating ink supply system for a nozzle array and a control method thereof. The circulating ink supply system collects excess ink in the nozzle module by setting up ink cartridge three, and reuses the ink processing component to send the excess ink to the nozzle module. Since the return path is short, the pipeline layout is convenient, and basically no bubbles are generated, there is no need to set up a debubbler. The temperature of the ink in ink cartridge three changes little, which makes it easier to subsequently adjust the temperature of the returned ink to the required temperature. The energy required for the temperature treatment of the returned ink is less. In addition, the ink temperature is easier to control, so that the viscosity stability of the ink is good and the printing effect is better. The present application solves the technical problems in the related art that the ink return path in the ink supply system is too long, the pipeline layout is difficult, the debubbling burden is increased, and the heat of the ink is wasted.

[0054] Reference Figure 1-Figure 3 A circulating ink supply system for a nozzle array includes an ink cartridge 2001, an ink supply unit, a defoaming unit, a plurality of ink storage units, a plurality of nozzle modules 2022, and a plurality of reflux units. The ink supply unit is used to supply ink to the ink cartridge 2001, and the defoaming unit defoams the ink in the ink cartridge 2001. The defoamed ink is then sent from the ink storage unit to the nozzle module 2022. In addition, the excess ink supplied to the nozzle module 2022 is sent back to the nozzle module 2022 via the reflux unit. Figure 7 According to the number of nozzle modules 2022, the number of ink storage units and reflux units is set accordingly to achieve multi-nozzle ink supply.

[0055] This arrangement shortens the return path of excess ink supplied to the nozzle module 2022, facilitates piping arrangement, and basically generates no bubbles, eliminating the need for a debubbler. Furthermore, the ink in the ink cartridge three 2003 still retains heat, reducing heat waste.

[0056] Reference Figure 1 and Figure 8 The circulating ink supply system for the nozzle array also includes a control module, which includes a host computer 6001 and a control board 6002. The host computer 6001 is electrically connected to the control board 6002. The control board 6002 is electrically connected to the ink supply unit, ink storage unit, defoaming unit, nozzle module 2022 and reflux unit to coordinate control of each part.

[0057] Reference Figure 1-Figure 3 The circulating ink supply system for the nozzle array also includes a positive pressure control system 1001 and a negative pressure control system 1002. The positive pressure control system 1001 and the negative pressure control system 1002 are electrically connected to the control board 6002 to control the pressure state of each ink cartridge, ensure the stability of the ink, and ensure normal printing.

[0058] Reference Figure 1-Figure 3The ink supply unit is connected to ink cartridge 2001. Both the positive pressure control system 1001 and the negative pressure control system 1002 are connected to ink cartridge 2001 via solenoid valve 6 1003 to adjust the pressure in ink cartridge 2001, thereby facilitating ink supply to ink cartridge 2001 via the ink supply unit. Furthermore, an air pressure sensor is provided within ink cartridge 2001. For ease of description, the air pressure sensor within ink cartridge 2001 is air pressure sensor 1006. Air pressure sensor 1006 detects the air pressure within ink cartridge 2001 and is electrically connected to control board 6002 to provide feedback on the air pressure signal within ink cartridge 2001.

[0059] Reference Figure 1-Figure 3 Specifically, the ink supply unit includes a remote ink supply mechanism 2004 and an ink cartridge ink supply mechanism. Remote ink supply mechanism 2004 communicates with ink cartridge 2001 via solenoid valve 2007, which is electrically connected to control board 6002. When ink needs to be refilled from remote ink supply mechanism 2004 to ink cartridge 2001, solenoid valve 2007 is first activated, connecting remote ink supply mechanism 2004 to ink cartridge 2001. Solenoid valve 1003 then activates the negative pressure control system 1002, generating negative pressure in ink cartridge 2001. This negative pressure is then detected by air pressure sensor 1006, reaching the required negative pressure for refilling. Ink from remote ink supply mechanism 2004 enters ink cartridge 2001, completing the ink refilling process. During this refilling process, ink cartridge 2001 is disconnected from the ink storage unit.

[0060] Reference Figure 1-Figure 3 The ink supply assembly includes ink cartridge 2005, which is connected to ink cartridge 1 2001 via solenoid valve 2028. Solenoid valve 2028 is electrically connected to control board 6002, allowing electrical signals to control the state of solenoid valve 2028. When ink needs to be refilled from ink cartridge 2005 to ink cartridge 1 2001, solenoid valve 2028 is first activated, connecting ink cartridge 2005 and ink cartridge 1 2001. Solenoid valve 6 1003 then activates negative pressure control system 1002, generating negative pressure in ink cartridge 1 2001. This negative pressure is detected by air pressure sensor 1006, reaching the negative pressure for refilling. Consequently, a pressure differential is created between the upper side of ink in ink cartridge 2005 and the upper side of ink in ink cartridge 1 2001, causing ink from ink cartridge 2005 to enter ink cartridge 1 2001, thus performing the ink refilling operation. In addition, when performing the ink replenishing operation, the ink cartridge 2001 and the ink storage unit are disconnected.

[0061] Reference Figure 1-Figure 3Furthermore, ink cartridge 1 2001 is equipped with two liquid level sensors. For ease of description, these sensors are liquid level sensor 1 2012 and liquid level sensor 2 2013. Liquid level sensor 1 2012 is used to detect the upper limit of the liquid level in ink cartridge 1 2001, while liquid level sensor 2 2013 is used to detect the lower limit of the liquid level in ink cartridge 1 2001. Both liquid level sensor 1 2012 and liquid level sensor 2 2013 are connected to control board 6002 to feed liquid level signals in ink cartridge 1 2001 back to the control module, thereby controlling the ink supply in ink cartridge 1 2001.

[0062] Wherein, the debubble unit includes a first debubble component and a second debubble component.

[0063] Reference Figure 1-Figure 3 Specifically, the first debubbling assembly includes a water pump 2011, a filter 2010, a debubbler 2009, and a second solenoid valve 2008. Ink cartridge 2001 is connected to filter 2010 via water pump 2011, which in turn is connected to debubbler 2009, which in turn is connected to ink cartridge 2001 via solenoid valve 2008. In other words, ink cartridge 2001, water pump 2011, filter 2010, debubbler 2009, and solenoid valve 2008 form a debubbling circulation loop to remove bubbles from the ink in ink cartridge 2001.

[0064] Reference Figure 1-Figure 3 Among them, the water pump 2011, the filter 2010 and the debubbler 2009 are all electrically connected to the control board 6002 and are operated by electrical signals. In addition, the debubbler 2009 is connected to the negative pressure control system 1002 to provide a working environment for the debubbler 2009.

[0065] With this arrangement, the debubbler 2009 and the filter 2010 filter impurities and eliminate bubbles in the ink flowing therethrough, and guide the ink back into the ink cartridge 2001 to ensure that the ink delivered to the ink storage unit meets the printing requirements.

[0066] Reference Figure 1-Figure 3 Specifically, the second debubbling assembly includes a second debubbler 2014 and multiple third solenoid valves 2015. The second debubbler 2014 is connected to the ink cartridge 2001, and is also connected to the ink storage unit via the third solenoid valve 2015. After the ink in the ink cartridge 2001 is debubbled by the second debubbler 2014, it is controlled by the third solenoid valve 2015 to enter the ink storage unit.

[0067] Among them, the solenoid valve three 2015 is electrically connected to the control board 6002, and the solenoid valve three 2015 is controlled by an electrical signal.

[0068] With this arrangement, the ink supplied to the ink storage unit is debubbled again by the debubbler 2014 to ensure that the ink entering the ink storage unit meets the printing requirements.

[0069] Reference Figure 1-Figure 3 The ink storage unit includes ink cartridge 2002 and an ink processing assembly. Specifically, debubbler 2014 is connected to ink cartridge 2002 via solenoid valve 3 2015 to supply debubbled ink to ink cartridge 2002 for storage.

[0070] Reference Figure 1-Figure 3 Both the positive pressure control system 1001 and the negative pressure control system 1002 communicate with the second ink cartridge 2002 via the seventh solenoid valve 1004. This regulates the pressure within the second ink cartridge 2002, ensuring a stable pressure within the cartridge 2002 and, consequently, a stable flow of ink to the printhead module 2022, guaranteeing print quality. The seventh solenoid valve 1004 is electrically connected to the control board 6002.

[0071] Reference Figure 1-Figure 3 The ink cartridge 2002 is provided with an air pressure sensor. For the convenience of introduction, the air pressure sensor in the ink cartridge 2002 is the air pressure sensor 2 1007. The air pressure in the ink cartridge 2002 is detected by the air pressure sensor 2 1007, and the air pressure sensor 2 1007 is electrically connected to the control board 6002 to feed back the air pressure signal in the ink cartridge 2 2002.

[0072] Reference Figure 1-Figure 3 Furthermore, three liquid level sensors are installed within ink cartridge 2002. For ease of description, these sensors are designated as liquid level sensor 3 2016, liquid level sensor 4 2017, and liquid level sensor 5 2018. Liquid level sensor 3 2016 detects the upper limit of the liquid level within ink cartridge 2002, liquid level sensor 4 2017 detects the middle level of ink cartridge 2002, and liquid level sensor 5 2018 detects the lower limit of the liquid level within ink cartridge 2002. Liquid level sensor 3 2016, liquid level sensor 4 2017, and liquid level sensor 5 2018 are all connected to control board 6002 to transmit liquid level signals within ink cartridge 2002 to the control module, thereby controlling the ink supply within ink cartridge 2002 and ensuring that ink cartridge 2002 is fully filled with ink, thereby reducing the possibility of bubbles forming within the ink within ink cartridge 2002.

[0073] When refilling ink from ink cartridge 1 2001 to ink cartridge 2 2002, solenoid valve 3 2015 first activates, connecting ink cartridge 1 2001 and ink cartridge 2 2002. Solenoid valve 7 1004 then connects to the negative pressure control system 1002, generating a negative pressure in ink cartridge 1 2001. This negative pressure is detected by air pressure sensor 2 1007, reaching the required negative pressure for refilling. Consequently, a pressure differential is created between the upper sides of the ink in ink cartridge 1 2001 and the upper sides of the ink in ink cartridge 2 2002. The ink in ink cartridge 1 2001 enters ink cartridge 2 2002 through debubbler 2 2014, executing the ink refill operation. Debubbler 2 2014 eliminates bubbles in the ink flowing through it. During this ink refilling operation, solenoid valve 1 2007 and solenoid valve 4 2028 are closed.

[0074] Reference Figure 1-Figure 3 , wherein the ink processing assembly includes a flow meter 1 2021, a temperature regulating element 2019, and a temperature sensor 1 2020. The ink cartridge 2002 is connected to the ink inlet pipe of the nozzle module 2022 through the solenoid valve 10 2029. The flow meter 1 2021 and the temperature regulating element 2019 are both arranged at the ink inlet pipe of the nozzle module 2022. The flow meter 1 2021 is used to measure the ink flow rate of the nozzle module 2022. The temperature regulating element 2019 regulates the temperature of the ink entering the nozzle module 2022 to change the viscosity of the ink, so as to determine the injection voltage, meet the printing requirements, and optimize the injection effect. The temperature sensor 1 2020 is attached to the temperature regulating element 2019 to monitor the temperature of the temperature regulating element 2019. In this embodiment, the temperature regulating element 2019 includes a heating plate to heat the ink. In some embodiments, the temperature regulating element 2019 may also include a cooling element to reduce the temperature of the ink. In some embodiments, the temperature regulating member 2019 may further include a cooling member and a heating plate to adaptively adjust the ink temperature according to the ink viscosity requirements.

[0075] The solenoid valve 10 2029, flow meter 1 2021, temperature adjustment element 2019, and temperature sensor 1 2020 are all electrically connected to the control board 6002. Furthermore, a temperature sensor 2023 is provided within the printhead module 2022 to detect the temperature of the ink within the printhead module 2022. The temperature sensor 2023 is electrically connected to the control board 6002.

[0076] With this arrangement, temperature sensor 1 2020 is used to feed back the temperature of the temperature regulating component 2019 to the control module, and adjust the temperature of the temperature regulating component 2019 according to the value of temperature sensor 2 2023, so as to adjust the temperature of the ink entering the nozzle module 2022 in real time to ensure printing quality.

[0077] Reference Figure 1 and Figure 6The circulating ink supply system for the printhead array further includes a high-voltage system 5000, which is connected to the printhead module 2022. The high-voltage system 5000 includes a power supply 5001 and a high-voltage amplifier 5002. The power supply 5001 is connected to the printhead module 2022 via the high-voltage amplifier 5002 to provide voltage to the multiple nozzles 3001 of the printhead module 2022. In this embodiment, the high-voltage system 5000 provides a high voltage of 2000-20000V to the printhead module 2022.

[0078] In this configuration, the nozzle module 2022 is connected to the high voltage system 5000. The power supply 5001 provides voltage, which is amplified by the high voltage amplifier 5002 and used to provide high voltage to the multiple nozzles 3001 of the nozzle module 2022 to meet the requirements of electro-fluid printing.

[0079] Reference Figure 1 and Figure 6 Furthermore, the circulating ink supply system for the printhead array also includes a water cooling system 4000, which is connected to the printhead module 2022 to control the temperature of the printhead module 2022. The water cooling system 4000 includes a water tank 4001, a second water pump 4002, a water cooling plate 4003, a heat exchanger 4004, and a third temperature sensor 4005. The second water pump 4002 and the third temperature sensor 4005 are both electrically connected to the control board 6002.

[0080] Reference Figure 1 and Figure 6 Specifically, water tank 4001 is used to store coolant. Water-cooled plate 4003 is connected to water tank 4001 via water pump 2 4002. Water-cooled plate 4003 is also connected to nozzle module 2022 to absorb heat from nozzle module 2022. Heat exchanger 4004 is connected to water-cooled plate 4003, which in turn is connected to water tank 4001 to reduce the temperature of the coolant in water cooling system 4000 and return it to water tank 4001. Temperature sensor 3 4005 is mounted on the surface of nozzle module 2022 to monitor the temperature of nozzle module 2022 during operation.

[0081] During electro-hydraulic printing, the temperature of the nozzle module 2022 gradually rises, exceeding the stable operating temperature range of the nozzle module 2022. Water pump 2 4002 activates, drawing coolant from the water tank 4001 through the water cooling plate 4003, thereby lowering the temperature of the nozzle module 2022. The heated coolant flows through the heat exchanger 4004, where it is cooled and returned to the water tank 4001. Temperature sensor 3 4005, attached to the nozzle module 2022, provides feedback on the operating temperature of the nozzle module 2022 to the control module, which then provides a signal to control the operation of water pump 2 4002.

[0082] Reference Figures 1-4The reflux unit includes a third ink cartridge 2003. The ink inlet of the third ink cartridge 2003 is connected to the printhead module 2022 to store excess ink entering the printhead module 2022. The ink outlet of the third ink cartridge 2003 is connected to the printhead module 2022 through the ink processing assembly to supply ink to the printhead module 2022.

[0083] Both the positive pressure control system 1001 and the negative pressure control system 1002 communicate with the ink cartridge 2003 via the solenoid valve 8 1005. This regulates the air pressure within the ink cartridge 2003, ensuring a stable pressure within the cartridge 2003 and, consequently, a stable flow of ink to the printhead module 2022, guaranteeing print quality. The solenoid valve 8 1005 is electrically connected to the control board 6002.

[0084] An air pressure sensor is provided in the ink cartridge three 2003. For the convenience of introduction, the air pressure sensor in the ink cartridge three 2003 is the air pressure sensor three 1008. The air pressure in the ink cartridge three 2003 is detected by the air pressure sensor three 1008, and the air pressure sensor three 1008 is electrically connected to the control board 6002 to feed back the air pressure signal in the ink cartridge three 2003.

[0085] Reference Figures 1-4 Furthermore, two liquid level sensors are installed within ink cartridge 3 2003. For ease of description, these two liquid level sensors are designated as liquid level sensor 6 2024 and liquid level sensor 7 2025. Liquid level sensor 6 2024 detects the upper limit of the liquid level within ink cartridge 3 2003, while liquid level sensor 7 2025 detects the lower limit of the liquid level within ink cartridge 3 2003. Both liquid level sensor 6 2024 and liquid level sensor 7 2025 are connected to control board 6002 to transmit liquid level signals within ink cartridge 3 2003 to the control module, thereby providing information on the ink level within ink cartridge 3 2003 and enabling the control module to select either ink cartridge 2 2002 or ink cartridge 3 2003 for ink supply to the printhead module 2022.

[0086] Ink cartridge three 2003 is connected to the ink inlet tube of the printhead module 2022 via solenoid valve five 2026, which is electrically connected to the control board 6002. After the ink in ink cartridge three 2003 is supplied to the ink inlet tube of the printhead module 2022, the ink flow rate is measured by flow meter one 2021, and the ink temperature is regulated by temperature regulator 2019.

[0087] With this arrangement, excess ink supplied to nozzle module 2022 is collected in ink cartridge three 2003. The ink in ink cartridge three 2003 is then re-supplied to nozzle module 2022 via the ink processing assembly. Therefore, the recirculating ink does not need to flow back into ink cartridge one 2001, shortening the return path and facilitating piping layout. The recirculating ink is more stable, and because the return path is shorter, bubbles are less likely to form, eliminating the need for a defoaming device in the return path, simplifying the piping structure. The temperature of the ink in ink cartridge three 2003 fluctuates less, making it easier to adjust the ink to the desired temperature. Reprocessing the ink through the ink processing assembly requires less energy, improving energy efficiency and saving energy. Furthermore, the ink temperature is easier to control, resulting in better viscosity stability and better printing results.

[0088] Reference Figure 1 and Figure 5 Optionally, the circulating ink supply system for the nozzle array further includes a waste liquid collection unit, which includes a waste liquid recovery station 3003 and a waste liquid collection bottle 2006. When the nozzle module 2022 is working, it sprays ink above the printing platform 3002. The waste liquid recovery station 3003 is arranged below the printing platform 3002, and the projection of the printing platform 3002 on the waste liquid recovery station 3003 falls completely on the waste liquid recovery station 3003. The waste liquid recovery station 3003 is used to collect waste liquid splashed or overflowed from the printing platform 3002. The waste liquid recovery station 3003 and the ink cartridge three 2003 are both connected to the waste liquid collection bottle 2006 through the solenoid valve nine 2027, so as to concentrate the waste liquid through the waste liquid collection bottle 2006 to facilitate subsequent processing. The solenoid valve nine 2027 is electrically connected to the control board 6002.

[0089] When ink recovery is required, solenoid valve nine 2027 activates, connecting the waste liquid recovery station 3003 to the waste liquid collection bottle 2006 to collect the waste liquid generated during printing. Solenoid valve nine 2027 closes, and solenoid valve eight 1005 activates, connecting the positive pressure control system 1001 and generating positive pressure in ink cartridge three 2003. Solenoid valve nine 2027 then activates, connecting ink cartridge three 2003 to the waste liquid collection bottle 2006 to collect the remaining waste liquid in ink cartridge three 2003.

[0090] An embodiment of the present application provides a circulating ink supply system for a nozzle array. When the ink supply system is in operation, the ink supply unit supplies ink to ink cartridge 1 2001, the first debubbling component debubbles the ink in ink cartridge 1 2001, and then the ink in ink cartridge 1 2001 is debubbled for the second time by the second component and then sent to ink cartridge 2 2002. The ink in ink cartridge 2 2002 is processed by the ink processing component and then supplied to the nozzle module 2022. The excess ink supplied to the nozzle module 2022 is collected in the ink cartridge three 2003, and the ink in the ink cartridge three 2003 is re-supplied to the nozzle module 2022 through the ink processing component. Therefore, the refluxed ink does not need to flow back to the ink cartridge one 2001, which shortens the reflux path and facilitates the arrangement of the pipeline; the refluxed ink has better stability, and since the reflux path is short, it is difficult to generate bubbles, so there is no need to set a defoaming device on the reflux path, which simplifies the pipeline structure; the temperature of the ink in the ink cartridge three 2003 changes less, and when the ink is re-processed through the ink processing component, it is easier to adjust the ink to the required temperature, and less energy is required, which improves energy utilization and saves energy. In addition, the ink temperature is easier to control, which makes the ink viscosity stable and the printing effect better.

[0091] Another embodiment of the present application provides a control method for a circulating ink supply system for a printhead array. Based on the circulating ink supply system for a printhead array described above, the control method utilizes a control module to control an ink supply unit, an ink storage unit, a defoaming unit, a printhead module 2022, and a reflux unit, including the following control methods:

[0092] Ink replenishing working condition: the ink supply unit supplies ink to ink cartridge 1 2001 , and the ink in ink cartridge 1 2001 is processed by the defoaming unit and then supplied to ink cartridge 2 2002 .

[0093] Specifically, when ink needs to be refilled from ink cartridge 2005 to ink cartridge 1 2001, solenoid valve 2028 is first activated, connecting ink cartridge 2005 to ink cartridge 1 2001. Solenoid valve 1003 then activates negative pressure control system 1002, generating a negative pressure in ink cartridge 1 2001. This negative pressure is then detected by air pressure sensor 1006, reaching the required negative pressure for refilling. Consequently, a pressure differential is created between the upper side of ink cartridge 2005 and the upper side of ink cartridge 1 2001, causing the ink in ink cartridge 2005 to enter ink cartridge 1 2001, completing the ink refilling process. Furthermore, solenoid valve 3 2015 is closed during this ink refilling process.

[0094] When ink needs to be refilled from remote ink supply mechanism 2004 to ink cartridge 1 2001, solenoid valve 1 2007 first activates, connecting remote ink supply mechanism 2004 and ink cartridge 1 2001. Solenoid valve 6 1003 then connects to the negative pressure control system 1002, generating a negative pressure in ink cartridge 1 2001. This negative pressure is then detected by air pressure sensor 1006, reaching the required negative pressure for refilling. Ink from remote ink supply mechanism 2004 enters ink cartridge 1 2001, completing the ink refilling process. During this ink refilling process, solenoid valve 3 2015 is closed.

[0095] When ink needs to be refilled from ink cartridge 1 2001 to ink cartridge 2 2002, solenoid valve 3 2015 first activates, connecting ink cartridge 1 2001 and ink cartridge 2 2002. Solenoid valve 7 1004 then connects to the negative pressure control system 1002, generating a negative pressure in ink cartridge 1 2001. This negative pressure is detected by air pressure sensor 2 1007, reaching the required ink refill pressure. Consequently, an air pressure differential is created between the upper sides of the ink in ink cartridge 1 2001 and the upper sides of the ink in ink cartridge 2 2002. The ink in ink cartridge 1 2001 enters ink cartridge 2 2002 through debubbler 2 2014, completing the ink refill operation. Debubbler 2 2014 eliminates bubbles in the ink flowing through it. During this ink refill operation, solenoid valve 1 2007, solenoid valve 4 2028, and solenoid valve 10 2029 are closed.

[0096] Ink circulation working condition: cut off the connection between ink cartridge 1 2001 and ink cartridge 2 2002, ink cartridge 2 2002 supplies ink to the nozzle module 2022 through the ink processing component, part of the ink is ejected from the nozzle module 2022, and the other part flows into ink cartridge 3 2003, and ink cartridge 3 2003 re-supplies the ink to the nozzle module 2022 through the ink processing component to realize circulating ink supply.

[0097] Specifically, when ink cartridge 1 2001 needs to be self-circulated, filtered, and debubbled, the ink path connecting remote ink supply mechanism 2004 and ink cartridge 4 2005 to ink cartridge 1 2001 is first disconnected. Next, water pump 1 2011 and solenoid valve 2 2008 are activated, which in turn activates filter 1 2010 and debubbler 1 2009. These filters filter impurities and eliminates bubbles in the ink flowing through them, before returning it to ink cartridge 1 2001. Furthermore, solenoid valve 3 2015 is closed during the self-circulation operation of ink cartridge 1 2001.

[0098] When ink circulation is required in the ink supply system, the ink path between ink cartridge 1 2001 and ink cartridge 2 2002 is first disconnected, causing solenoid valve 10 2029 to activate, connecting ink cartridge 2 2002 to printhead module 2022. Solenoid valve 7 1004 then activates the positive pressure control system 1001, generating positive pressure in ink cartridge 2 2002. The pressure differential between ink cartridge 2 2002 and printhead module 2022 forces ink into printhead module 2022, whereupon some ink is ejected from nozzle 3001 of printhead module 2022, while the remainder flows into ink cartridge 3 2003.

[0099] When ink cartridge three 2003 supplies ink to the nozzle module 2022, solenoid valve ten 2029 is closed, solenoid valve five 2026 is opened, and solenoid valve eight 1005 is connected to the positive pressure control system 1001, generating positive pressure in ink cartridge three 2003. The air pressure difference between ink cartridge three 2003 and the nozzle module 2022 squeezes the ink into the nozzle module 2022.

[0100] Ink jet printing working conditions: monitor and adjust the ink flow supplied to the nozzle module 2022; adjust the temperature of the ink supplied to the nozzle module 2022; monitor the temperature of the ink temperature adjustment point and the internal temperature of the nozzle module 2022, and adjust the temperature of the ink temperature adjustment point; apply voltage to the nozzle module 2022 during printing, and control the temperature of the nozzle module 2022.

[0101] Specifically, when electro-hydraulic printing is required, the ink path between ink cartridge 1 2001 and ink cartridge 2 2002 is first disconnected, causing solenoid valve 10 2029 to activate, connecting ink cartridge 2 2002 to the printhead module 2022. Solenoid valve 7 1004 then connects to the positive pressure control system 1001, generating positive pressure in ink cartridge 2 2002. The pressure differential between ink cartridge 2 2002 and the printhead module 2022 forces ink into the printhead module 2022, with some ink ejected from the nozzle 3001 of the printhead module 2022 and the remainder entering ink cartridge 3 2003. A flow meter 1 2021 is installed between ink cartridge 2 2002 and the printhead module 2022 to measure the flow rate and provide feedback to the control module. The control module then adjusts the output positive pressure parameters to control the flow rate, ensuring that the flow rate meets the printing requirements. A temperature regulator 2019 is installed between ink cartridge 2002 and nozzle module 2022. This regulates the temperature of the ink flowing through it, adjusting the ink viscosity and determining the jetting voltage to meet printing requirements and optimize the jetting effect. A temperature sensor 1 2020 is attached to this temperature regulator 2019, which provides feedback to the control module and adjusts the temperature of the temperature regulator 2019 based on the value of temperature sensor 2023 inside nozzle module 2022.

[0102] During electro-hydraulic printing, the temperature of the printhead module 2022 gradually rises, exceeding the stable operating temperature range of the printhead. Water pump 2 4002 activates, drawing cold water from the water tank 4001 through the water cooling plate 4003, thereby lowering the temperature of the printhead module 2022. The heated water in the water pipe flows through the heat exchanger 4004, where it cools down and returns to the water tank 4001. A temperature sensor 3 4005 is attached to the printhead module 2022, providing feedback on the operating temperature of the printhead module 2022 to the control module, which then provides a signal to control the operation of water pump 2 4002.

[0103] The nozzle module 2022 is connected to the high voltage system 5000; the power supply 5001 provides voltage, which is amplified by the high voltage amplifier 5002 and used to provide high voltage to the multiple nozzles 3001 of the nozzle module 2022 to meet the requirements of electro-fluid printing.

[0104] Ink recovery working condition: collect waste liquid splashed or overflowed from the printing platform 3002 and introduce the waste liquid into the waste liquid collection bottle 2006 for collecting waste liquid; introduce the waste liquid in the ink cartridge three 2003 into the waste liquid collection bottle 2006.

[0105] Specifically, when ink recovery is required, ink is ejected from nozzles 3001 of printhead module 2022 onto printing platform 3002. Waste liquid recovery station 3003 collects any spilled or overflowed waste liquid from printing platform 3002. Solenoid valve 9 2027 activates, connecting waste liquid recovery station 3003 to waste liquid collection bottle 2006 to collect the waste liquid generated during printing. Solenoid valve 5 2026 then closes, and solenoid valve 8 1005 activates, connecting positive pressure control system 1001 and generating positive pressure in ink cartridge 3 2003. Solenoid valve 9 2027 then activates, connecting ink cartridge 3 2003 to waste liquid collection bottle 2006 to collect the remaining waste liquid in ink cartridge 3 2003.

[0106] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0107] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0108] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A circulating ink supply system for a nozzle array, characterized in that: It includes: Cartridge 1; an ink supply unit, the ink supply unit being in communication with the ink cartridge 1 to supply ink to the ink cartridge 1; a debubble unit, the debubble unit comprising a first debubble component and a second debubble component, the first debubble component being in communication with the ink cartridge 1 to remove bubbles from the ink in the ink cartridge 1; Multiple ink storage units, each comprising a second ink cartridge and an ink processing assembly, wherein the second ink cartridge is connected to the first ink cartridge via the second debubbling assembly; A plurality of groups of nozzle modules, each of which is connected to a plurality of ink cartridges 2 through a plurality of groups of ink processing components to supply ink to the nozzle modules; a plurality of reflux units, each comprising a third ink cartridge, an ink inlet end of each ink cartridge being connected to the printhead module to store excess ink entering the printhead module, and an ink outlet end of each ink cartridge being connected to the printhead module via the ink processing assembly to supply ink to the printhead module; The ink processing assembly includes a flow meter 1, a temperature adjustment member, and a temperature sensor 1. The ink cartridge 2 is connected to the ink inlet pipe of the printhead module via a solenoid valve 10, and the ink cartridge 3 is connected to the ink inlet pipe of the printhead module via a solenoid valve 5. The flow meter 1 and the temperature adjustment member are both provided at the ink inlet pipe of the printhead module. The temperature sensor 1 is attached to the temperature adjustment member to monitor the temperature of the temperature adjustment member. A positive pressure control system and a negative pressure control system, wherein the positive pressure control system and the negative pressure control system are connected to ink cartridge one through solenoid valve six, the positive pressure control system and the negative pressure control system are connected to ink cartridge two through solenoid valve seven, and the positive pressure control system and the negative pressure control system are connected to ink cartridge three through solenoid valve eight to control the pressures in ink cartridge one, ink cartridge two, and ink cartridge three.

2. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: Also included is a waste liquid collection unit, the waste liquid collection unit comprising: a waste liquid recovery station, wherein the nozzle module is suitable for spraying ink above the printing platform, and the waste liquid recovery station is used to collect waste liquid splashed or overflowed from the printing platform; A waste liquid collection bottle is connected to the waste liquid recovery station and the ink cartridge.

3. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: It also includes a water cooling system, which is connected to the nozzle module to control the temperature of the nozzle module. The water cooling system includes: a water tank, the water tank being used to store coolant; Water pump 2; a water-cooling plate, the water-cooling plate being connected to the water tank via the second water pump and the water-cooling plate being connected to the nozzle module to absorb heat from the nozzle module; a heat exchanger, the heat exchanger being in communication with the water-cooled plate and the heat exchanger being in communication with the water tank; Temperature sensor three, the temperature sensor three is arranged on the surface of the nozzle module to monitor the temperature of the nozzle module when it is working.

4. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: It also includes a high-voltage system, which is connected to the nozzle module. The high-voltage system includes a power supply and a high-voltage amplifier. The power supply is connected to the nozzle module through the high-voltage amplifier to provide voltage to the multiple nozzles of the nozzle module.

5. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: The ink supply unit comprises: a remote ink supply mechanism, the remote ink supply mechanism being connected to the ink cartridge one via a solenoid valve one; An ink cartridge ink supply mechanism, wherein the ink cartridge ink supply mechanism includes an ink cartridge four, and the ink cartridge four is connected to the ink cartridge one through a solenoid valve four.

6. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: The first debubble assembly includes a water pump 1, a filter 1, a debubble device 1, and a solenoid valve 2. The ink cartridge 1 is connected to the filter 1 via the water pump 1, the filter 1 is connected to the debubble device 1, and the debubble device 1 is connected to the ink cartridge 1 via the solenoid valve 2. The second debubbling assembly includes a second debubbler and a plurality of third solenoid valves. The second debubbler is connected to the second ink cartridge via the third solenoid valve.

7. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: Two liquid level sensors are provided in each of the ink cartridges 1, 2 and 3 to detect the upper limit and lower limit of the liquid levels in the ink cartridges 1, 2 and 3; The ink cartridge 1, the ink cartridge 2 and the ink cartridge 3 are all equipped with an air pressure sensor to detect the air pressure inside the ink cartridge 1, the ink cartridge 2 and the ink cartridge 3.

8. The circulating ink supply system for a nozzle array according to claim 1, characterized in that: It also includes a control module, which includes a host computer and a control board. The host computer is electrically connected to the control board, and the control board is electrically connected to the ink supply unit, the ink storage unit, the defoaming unit, the nozzle module and the reflux unit.

9. A control method for a circulating ink supply system for a printhead array, based on the circulating ink supply system for a printhead array according to any one of claims 1 to 8, characterized in that: The control method uses a control module to control the ink supply unit, ink storage unit, defoaming unit, nozzle module and reflux unit, including the following control methods: Ink refilling working condition: The ink supply unit supplies ink to ink cartridge 1, and the ink in ink cartridge 1 is processed by the defoaming unit and then supplied to ink cartridge 2; Ink circulation working condition: Cut off the connection between ink cartridge 1 and ink cartridge 2, ink cartridge 2 supplies ink to the print head module through the ink processing assembly, part of the ink is ejected by the print head module, and the other part is collected in ink cartridge 3, which then resupplies the ink to the print head module through the ink processing assembly, thus realizing the ink circulation; Inkjet printing conditions: monitor and adjust the ink flow supplied to the printhead module; adjust the temperature of the ink supplied to the printhead module; monitor the temperature of the ink temperature control unit and the internal temperature of the printhead module, and adjust the temperature of the ink temperature control unit; apply voltage to the printhead module during printing, and control the temperature of the printhead module; Ink recovery working condition: collect waste liquid splashed or overflowed from the printing platform and introduce the waste liquid into a waste liquid collection bottle for collecting waste liquid; introduce the waste liquid in the ink cartridge three into the waste liquid collection bottle.

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