A centralized air circuit control system for inkjet printing machine and a control method thereof

Abstract

The embodiment of the present invention discloses a centralized air circuit control system for an inkjet printing machine and a control method thereof. The system includes an air circuit main control board, which integrates a degassing lung control module, a positive and negative pressure control module, a pressure sensing module and a main control chip; a degassing lung is installed in the printing machine, which is connected to a lung negative pressure pump through a trachea, and the degassing lung control module is connected to the lung negative pressure pump; the pressure sensing module monitors the pressure data in the air circuit in real time, and transmits the data to the main control chip; the main control chip generates a pressure adjustment signal and a negative pressure control signal based on these data, and sends them to the positive and negative pressure control module and the degassing lung control module respectively. The positive and negative pressure control module adjusts the positive and negative pressures of the ink cartridge to adapt to the inkjet and cleaning modes, while the degassing lung control module adjusts the lung negative pressure pump to remove bubbles in the ink. The present invention can solve the problems that the existing air circuit system is complex and difficult to operate, has high energy consumption, insufficient flow, high maintenance costs and difficult debugging.

Description

Technical Field

[0001] The present invention relates to the technical field of printing machines, and in particular to an air path centralized control system for an inkjet printing machine and a control method thereof. Background Art

[0002] The inkjet system of a printing machine includes an inkjet carriage and a fabric transmission device. The inkjet carriage is equipped with multiple inkjet heads, which are the core components for inkjet printing. Since ink accumulation is inevitable during the inkjet process, it is necessary to clean the inkjet heads regularly to keep them in optimal working condition. The inkjet heads require a stable negative pressure air source when working normally to keep the ink balanced and not flow out due to gravity. During the cleaning process, positive pressure must first be applied to the ink cartridge, and then switched to a stable negative pressure to avoid ink leakage and ensure the cleaning effect.

[0003] Chinese patent CN110356117B proposes an improved air circuit system that realizes different air pressure control modes through multiple air circuits to meet the various usage requirements of the printing machine. However, this system has complex pipelines, many regulating valves, and is difficult to operate. Chinese patent CN215204074U introduces a negative pressure regulation system that automatically adjusts positive pressure or exhausts air to achieve negative pressure regulation by comparing the set negative pressure value with the sensor detection value. However, this system still has problems such as insufficient flow, poor energy saving effect and high maintenance cost. At the same time, the installation and debugging of this system are complicated and it is not suitable for the needs of large multi-head printing systems.

[0004] Therefore, it is necessary to design a new system to solve the problems of the existing gas circuit system being complex and difficult to operate, with high energy consumption, insufficient flow, high maintenance cost and difficult debugging. Summary of the invention

[0005] The object of the present invention is to overcome the defects of the prior art and provide an inkjet printing machine gas path centralized control system and a control method thereof.

[0006] In order to solve the above technical problems, the object of the present invention is achieved through the following technical solutions: providing an inkjet printing machine gas circuit centralized control system, including a gas circuit main control board, on which a degassing lung control module, a positive and negative pressure control module, a pressure sensing module and a main control chip are integrated; a degassing lung is arranged in the printing machine, the degassing lung is connected to a trachea, and a lung negative pressure pump is connected to the trachea; the degassing lung control module is connected to the lung negative pressure pump;

[0007] The pressure sensing module is used to monitor the pressure data in each gas path of the printing machine in real time and transmit the pressure data to the main control chip;

[0008] The main control chip is used to generate a pressure adjustment signal and a negative pressure control signal according to the pressure data, and transmit the pressure adjustment signal to the positive and negative pressure control module, and transmit the negative pressure control signal to the degassing lung control module;

[0009] The positive and negative pressure control module is used to adjust the positive and negative pressures of the ink cartridge according to the pressure adjustment signal to meet the requirements of the inkjet and cleaning modes;

[0010] The degassing lung control module is used to control the lung negative pressure pump to provide a negative pressure working gas source to the degassing lung according to the negative pressure control signal, so that the degassing lung removes bubbles in the ink.

[0011] Its further technical solution is: the gas circuit main control board is also integrated with a communication module and a power module;

[0012] Wherein, the power supply module is used to provide power to the degassing lung control module, the positive and negative pressure control module, the pressure sensing module and the main control chip;

[0013] The main control chip is connected to the external device through the communication module;

[0014] The gas circuit main control board also integrates an external gas source and an external gas source sensor; the external gas source is used to provide gas to the solenoid valve outside the ink circuit in the printing machine; the external gas source sensor is used to collect the external gas pressure of the external gas source and send it to the main control chip.

[0015] Its further technical solution is: the positive and negative pressure control module includes a first negative pressure control unit, a second negative pressure control unit, and a positive pressure control unit; the first negative pressure control unit is connected to a first negative pressure pump in the printing machine; the second negative pressure control unit is connected to a second negative pressure pump in the printing machine; the positive pressure control unit is connected to a positive pressure pump in the printing machine, and the positive pressure pump is connected to an inkjet head;

[0016] Wherein, the first negative pressure control unit is used to control the working state of the first negative pressure pump to control the negative pressure provided by the first negative pressure pump to the color ink cartridge in the printing machine;

[0017] The second negative pressure control unit is used to control the working state of the second negative pressure pump to control the negative pressure provided by the second negative pressure pump to the white ink cartridge in the printing machine;

[0018] The positive pressure control unit is used to control the positive pressure pump to provide positive pressure during the cleaning process, so that the ink is squeezed out from the inkjet head to unclog the clogged inkjet head.

[0019] A further technical solution is as follows: the negative pressure range provided by the first negative pressure pump is -16 kPa to 0 kPa; the positive pressure range provided by the positive pressure pump is 0 kPa to 40 kPa.

[0020] A further technical solution is: the lung negative pressure pump provides a negative pressure range of -80 KPa to -90 KPa.

[0021] A further technical solution is: the first negative pressure pump and the second negative pressure pump are connected to 5L gas tanks respectively, the lung negative pressure pump is connected to a 0.5L gas tank, and the positive pressure pump is connected to a 1L gas tank.

[0022] Its further technical solution is: the trachea connected to the first negative pressure pump, the trachea connected to the second negative pressure pump, the trachea connected to the lung negative pressure pump and the trachea connected to the positive pressure pump are respectively provided with two-way valves; the trachea connected to the first negative pressure pump, the trachea connected to the second negative pressure pump and the trachea connected to the positive pressure pump are also respectively provided with adjustment valves, and the trachea connected to the first negative pressure pump and the trachea connected to the second negative pressure pump are respectively connected to negative pressure gauges.

[0023] Its further technical solution is: the main control chip is used to calculate the corresponding pressure according to the pressure data using a fuzzy PID algorithm, and to generate a pressure adjustment signal and a negative pressure control signal using an adaptive control method, and to transmit the pressure adjustment signal to the positive and negative pressure control module, and to transmit the negative pressure control signal to the degassing lung control module.

[0024] Its further technical solution is: the printing machine includes a control interface, and the control interface is used to display all real-time monitoring information of air pressure, wherein all real-time monitoring information of air pressure includes monitoring information of external air pressure, positive pressure, lung negative pressure and first negative pressure and second negative pressure.

[0025] In addition, in order to overcome the defects of the prior art, the present invention also provides a control method executed by the above-mentioned inkjet printing machine gas path centralized control system, comprising:

[0026] When the printing machine is in normal inkjet mode, the main control chip drives the positive and negative pressure control module and the degassing lung control module, so that the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module are turned on, and the pump controlled by the degassing lung control module is turned on;

[0027] When the printing machine switches from the normal inkjet mode to the cleaning mode, the main control chip drives the degassing lung control module and the positive and negative pressure control module, so that the pump controlled by the degassing lung control module continues to work, the positive pressure pump controlled by the positive and negative pressure control module works, and the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module are turned off;

[0028] When the printing machine switches from cleaning mode to normal inkjet mode, the main control chip drives the degassing lung control module and the positive and negative pressure control module, so that the pump controlled by the degassing lung control module continues to work, the positive pressure pump controlled by the positive and negative pressure control module is turned off, and the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module work.

[0029] The beneficial effects of the present invention compared with the prior art are as follows: the present invention sets up an air circuit main control board, which includes a degassing lung control module, a positive and negative pressure control module, a pressure sensing module and a main control chip. The degassing lung in the printing machine is connected to the lung negative pressure pump through the trachea, the degassing lung control module is connected to the lung negative pressure pump, the pressure sensing module monitors the pressure in the air circuit in real time, and transmits the data to the main control chip, the main control chip generates an adjustment signal according to the pressure data, adjusts the positive and negative pressure control modules and the degassing lung control module, the positive and negative pressure control module adjusts the ink cartridge pressure to meet the demand, and the degassing lung control module ensures the removal of bubbles in the ink; so as to solve the problems that the existing air circuit system is complex and difficult to operate, has high energy consumption, insufficient flow, high maintenance cost and difficult debugging.

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0032] Figure 1 A schematic block diagram of a centralized air circuit control system for an inkjet printing machine provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a gas circuit main control board provided in an embodiment of the present invention;

[0034] Figure 3 A wiring diagram of a centralized air circuit control system for an inkjet printing machine provided by an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of a control interface provided by an embodiment of the present invention Figure 1 ;

[0036] Figure 5 Schematic diagram of a control interface provided by an embodiment of the present invention Figure 2 .

[0037] Description of the symbols in the figure:

[0038] 10. Degassing lung control module; 20. Positive and negative pressure control module; 30. Pressure sensing module; 31. External gas source sensor; 33. Negative pressure sensor; 34. Lung negative pressure sensor; 35. Positive pressure sensor; 36. Two-way negative pressure sensor; 37. Backup sensor; 40. Main control chip; 50. Communication module; 60. Power supply module; 71. First negative pressure pump; 72. Negative pressure regulating valve; 73. Lung negative pressure pump; 74. Positive pressure pump; 75. Positive pressure regulating valve; 76. Second negative pressure pump; 77. Two-way negative pressure regulating valve; 80. Negative pressure gauge; 90. Two-way valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0041] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0042] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0043] See also Figure 1 , Figure 1A schematic block diagram of a centralized air circuit control system for an inkjet printing machine provided in an embodiment of the present invention can be used in the control process of an inkjet printing machine. By centrally controlling the air source, it has lower costs, more convenient maintenance, and simpler air pressure regulation than simple control methods such as traditional PLCs and pressure switches. It can also set working and alarm conditions as needed to ensure that the ink supply system operates under a stable air source. In addition, a negative pressure source and external air detection are added to replace large compressors, saving space and reducing energy consumption, while improving system stability. When the printing machine is in working condition, the degassing lung is always working to ensure normal ink supply and eliminate tiny bubbles in the ink. During the inkjet printing process, the system simultaneously collects and controls multiple air pressure signals to achieve precise air circuit positioning, convenient data collection, support remote monitoring and system upgrades, and does not require on-site technical support.

[0044] See also Figure 1 The above-mentioned air circuit centralized control system of an inkjet printing machine includes an air circuit main control board, on which a degassing lung control module 10, a positive and negative pressure control module 20, a pressure sensing module 30 and a main control chip 40 are integrated; a degassing lung is arranged in the printing machine, the degassing lung is connected to a trachea, and a lung negative pressure pump 73 is connected to the trachea; the degassing lung control module 10 is connected to the lung negative pressure pump 73;

[0045] The pressure sensing module 30 is used to monitor the pressure data in each gas path of the printing machine in real time and transmit the pressure data to the main control chip 40;

[0046] The main control chip 40 is used to generate a pressure adjustment signal and a negative pressure control signal according to the pressure data, and transmit the pressure adjustment signal to the positive and negative pressure control module 20, and transmit the negative pressure control signal to the degassing lung control module 10;

[0047] The positive and negative pressure control module 20 is used to adjust the positive and negative pressures of the ink cartridge according to the pressure adjustment signal to meet the requirements of the inkjet and cleaning modes;

[0048] The degassing lung control module 10 is used to control the lung negative pressure pump 73 to provide a negative pressure working gas source to the degassing lung according to the negative pressure control signal, so that the degassing lung removes bubbles in the ink.

[0049] In this embodiment, the air circuit main control board integrates the degassing lung control module 10, the positive and negative pressure control module 20, the pressure sensing module 30 and the main control chip 40; the pressure sensing module 30 monitors the pressure data of each air circuit of the printing machine in real time, and transmits the data to the main control chip 40; the main control chip 40 processes the pressure data, generates corresponding pressure adjustment signals and negative pressure control signals, and transmits them to the positive and negative pressure control module 20 and the degassing lung control module 10 respectively; the degassing lung control module 10 is responsible for controlling the operation of the lung negative pressure pump 73 to ensure the negative pressure working state of the degassing lung; the positive and negative pressure control module 20 adjusts the positive and negative pressures of the ink cartridge according to the pressure adjustment signal to meet the requirements of inkjet and cleaning modes.

[0050] Specifically, the degassing lung is equipped with a trachea and a lung negative pressure pump 73, which is responsible for removing bubbles in the ink to ensure the stability of ink supply and printing quality.

[0051] The lung negative pressure pump 73 provides the necessary negative pressure gas source to support the normal operation of the degassed lung.

[0052] The pressure sensing module 30 monitors and records the pressure data in each gas path of the printing machine in real time, including the external air pressure; and transmits the monitored pressure data to the main control chip 40 for further processing and control.

[0053] The positive and negative pressure control module 20 adjusts the positive and negative pressures of the ink cartridge according to the pressure adjustment signal generated by the main control chip 40 to meet the requirements of different working modes (such as inkjet and cleaning modes).

[0054] The degassing lung control module 10 controls the operation of the lung negative pressure pump 73 according to the negative pressure control signal sent by the main control chip 40, thereby providing a negative pressure gas source to the degassing lung to remove bubbles in the ink.

[0055] The gas circuit main control board mentioned in this embodiment is as follows Figure 2 As shown, the pressure sensing module 30 includes various sensors in the figure; specifically, it includes an external air source sensor 31, a negative pressure sensor 33, a lung negative pressure sensor 34, a positive pressure sensor 35, a two-way negative pressure sensor 36 and a backup sensor 37. The negative pressure sensor 33 is used to detect the pressure on the trachea connected to the first negative pressure pump 71; the lung negative pressure sensor 34 is used to detect the pressure on the trachea connected to the lung negative pressure pump 73; the positive pressure sensor 35 is used to detect the pressure on the trachea connected to the positive pressure pump 74; the two-way negative pressure sensor 36 is used to detect the pressure on the trachea connected to the second negative pressure pump 76; the backup sensor 37 is used as a backup pressure sensor in case of emergency.

[0056] The system of this embodiment makes the ink supply more stable through precise pressure regulation and negative pressure control, thereby improving the printing quality and reliability of the printing machine; centralized control reduces the dependence on multiple independent control devices, simplifies the operation interface and maintenance process, and improves the usability of the system; it replaces traditional large compressors and other energy-consuming equipment, reduces the occupied space and energy consumption, and meets the requirements of energy conservation and emission reduction; real-time pressure monitoring and automatic adjustment functions improve the response speed and adaptability of the system, and can quickly respond to changes in working conditions; data acquisition and remote monitoring capabilities of system control, as well as a simple upgrade method, make system maintenance and upgrades more efficient.

[0057] Through the implementation of the above system, the air path control of the inkjet printing machine will become more intelligent, stable and efficient, bringing better printing effects and lower maintenance costs.

[0058] In one embodiment, see Figure 1 The above-mentioned gas circuit main control board is also integrated with a communication module 50 and a power module 60;

[0059] Among them, the power module 60 is used to provide power to the degassing lung control module 10, the positive and negative pressure control module 20, the pressure sensing module 30 and the main control chip 40;

[0060] The main control chip 40 is connected to external devices through the communication module 50 .

[0061] In this embodiment, the gas circuit main control board further integrates a communication module 50 and a power module 60;

[0062] The power module 60 provides a stable power supply for the degassing lung control module 10, the positive and negative pressure control module 20, the pressure sensing module 30 and the main control chip 40, thereby ensuring the stable operation of each component of the system and improving the reliability of the overall system.

[0063] The main control chip 40 exchanges data and transmits instructions with external devices through the communication module 50. Real-time data transmission and instruction execution with external devices are realized, and the coordination and response speed of the system are enhanced to realize remote printing processing, etc.

[0064] The power module 60 provides unified power management, reduces power interference, and improves the stability and reliability of the system. The communication module 50 ensures smooth data transmission between the control modules, improving the responsiveness and operation accuracy of the system. The integrated power and communication module 50 simplifies the internal wiring of the system, improving the neatness and maintenance convenience of the system.

[0065] In one embodiment, the positive and negative pressure control module 20 includes a first negative pressure control unit, a second negative pressure control unit, and a positive pressure control unit; the first negative pressure control unit is connected to a first negative pressure pump 71 in the printing machine; the second negative pressure control unit is connected to a second negative pressure pump 76 in the printing machine; the positive pressure control unit is connected to a positive pressure pump 74 in the printing machine, and the positive pressure pump 74 is connected to the inkjet head;

[0066] The first negative pressure control unit is used to control the working state of the first negative pressure pump 71 to control the negative pressure provided by the first negative pressure pump 71 to the color ink cartridge in the printing machine;

[0067] A second negative pressure control unit, used to control the working state of the second negative pressure pump 76, so as to control the negative pressure provided by the second negative pressure pump 76 to the white ink cartridge in the printing machine;

[0068] The positive pressure control unit is used to control the positive pressure pump 74 to provide positive pressure during the cleaning process so that the ink is squeezed out from the inkjet head to unclog the clogged inkjet head.

[0069] The negative pressure provided by the first negative pressure pump 71 ranges from -16 kPa to 0 kPa; the positive pressure provided by the positive pressure pump 74 ranges from 0 kPa to 40 kPa.

[0070] In this embodiment, the positive and negative pressure control module 20 is composed of three key units: a first negative pressure control unit, a second negative pressure control unit and a positive pressure control unit:

[0071] The first negative pressure control unit controls the first negative pressure pump 71 connected thereto to adjust the negative pressure applied to the color ink cartridges in the printing machine, thereby ensuring a stable supply of color ink and avoiding uneven ink flow or insufficient supply.

[0072] The second negative pressure control unit controls the second negative pressure pump 76 connected thereto to adjust the negative pressure of the white ink cartridge in the printing machine, thereby providing accurate negative pressure regulation to ensure a stable supply of white ink and avoid printing quality problems.

[0073] The positive pressure control unit controls the positive pressure pump 74 during the cleaning process to generate positive pressure to squeeze out ink and clear blockages from the inkjet head, thereby effectively cleaning the inkjet head, maintaining the normal working state of the inkjet head, extending its service life and maintaining the printing quality.

[0074] Each unit controls a different pump to achieve precise negative and positive pressure regulation, ensuring efficient ink supply and cleaning process. Stable negative pressure control and stable supply of color and white ink ensure consistent printing results. Positive pressure control function can quickly clean the inkjet head, reducing maintenance time and downtime.

[0075] In one embodiment, the above-mentioned lung negative pressure pump 73 provides a negative pressure range of -80 KPa to -90 KPa. This negative pressure range can provide a stable negative pressure environment, ensure the uniform flow of ink in the inkjet head, avoid poor ink flow or insufficient supply, and thus improve the printing quality; stable negative pressure control can reduce the formation of bubbles and gases in the ink, reduce defects and unevenness during the printing process, and ensure the color and details of the printout are accurate; stable control of negative pressure helps to maintain the best working state of the inkjet head, reduce the clogging problem of the inkjet head, and extend the service life of the inkjet head; effective negative pressure control reduces ink flow problems and reduces the frequency of frequent cleaning of the inkjet head, thereby reducing the complexity and time of maintenance work; moreover, a stable negative pressure range helps to avoid equipment failures or abnormal operations caused by negative pressure fluctuations, and improves the reliability and service life of the overall equipment. In a high negative pressure environment, the ink jetting and flow can be more precise, suitable for high-precision printing requirements, such as detailed images and complex graphics.

[0076] In summary, precise control of the negative pressure range not only improves print quality and equipment reliability, but also reduces maintenance costs and frequency, thereby improving overall operational efficiency and user experience.

[0077] In one embodiment, the first negative pressure pump 71 and the second negative pressure pump 76 are connected to 5L gas tanks respectively, the lung negative pressure pump 73 is connected to a 0.5L gas tank, and the positive pressure pump 74 is connected to a 1L gas tank.

[0078] In this embodiment, according to the gas source flow and stability requirements, two negative pressure pumps are connected to their respective 5L gas tanks, the lung negative pressure pump 73 is connected to the 0.5L gas tank, and the positive pressure pump 74 is connected to the 1L gas tank, and then these gas tanks deliver the gas source to each inkjet cartridge respectively.

[0079] Large-capacity gas tanks (such as 5L) are used for negative pressure pumps to ensure a stable gas flow rate and reduce the impact of gas source fluctuations on negative pressure control; smaller-capacity gas tanks (such as 0.5L and 1L) provide sufficient gas sources for the lung negative pressure pump 73 and the positive pressure pump 74, while maintaining precise pressure regulation to meet the needs of different pumps; separate gas tank and pump configurations can simplify gas source management, facilitate maintenance and replacement of each gas tank, and improve system reliability; a stable gas source supply ensures the normal operation of the inkjet cartridge, avoids instability during ink supply and inkjet head cleaning, and improves print quality; by reasonably configuring the gas tank capacity, the system can effectively balance the needs of negative and positive pressures and improve overall operating efficiency and performance.

[0080] In one embodiment, see Figure 3A two-way valve 90 is respectively provided on the trachea connected to the first negative pressure pump 71, the trachea connected to the second negative pressure pump 76, the trachea connected to the lung negative pressure pump 73 and the trachea connected to the positive pressure pump 74; an adjustment valve is also respectively provided on the trachea connected to the first negative pressure pump 71, the trachea connected to the second negative pressure pump 76 and the trachea connected to the positive pressure pump 74, and the trachea connected to the first negative pressure pump 71 and the trachea connected to the second negative pressure pump 76 are respectively connected to a negative pressure gauge 80.

[0081] like Figure 1 As shown, the adjusting valve on the air pipe connected to the positive pressure pump 74 is the positive pressure adjusting valve 75 in the figure, the adjusting valve on the air pipe connected to the first negative pressure pump 71 is the negative pressure adjusting valve 72 in the figure, and the adjusting valve on the air pipe connected to the second negative pressure pump 76 is the two-way negative pressure adjusting valve 77 in the figure.

[0082] In this embodiment, the two-way valve 90 makes it possible to selectively open or close the air pipe when needed, thereby increasing the flexibility and ease of operation of the system; the adjustment valve allows precise adjustment of the air flow and pressure, thereby optimizing the performance of each pump and meeting system requirements; the negative pressure gauge 80 provides real-time negative pressure readings, which helps to continuously monitor the operating status of the negative pressure pump and ensure stable operation of the system; through the combination of the valve and the negative pressure gauge 80, the air source or negative pressure problem can be quickly located and resolved, thereby improving the maintenance efficiency of the system; such a configuration enables the system to balance and optimize the use of the air source and improve the reliability and performance of the overall operation.

[0083] In this embodiment, the trachea connected to the degassing lung is connected to the ink supply system of the printing machine to remove tiny bubbles in the ink. Specifically, the trachea of ​​the degassing lung is equipped with a two-way valve 90 and a lung negative pressure pump 73, and the degassing lung is connected to the ink supply system through these components. The function of the lung negative pressure pump 73 is to control the pressure of the degassing lung at about -90kPa, thereby ensuring that the ink in the ink path does not contain small bubbles. Compared with the traditional negative pressure generator, this configuration has the following advantages:

[0084] By optimizing pressure control, the degassing lung works more efficiently, thus saving energy.

[0085] This configuration is compact and takes up less physical space.

[0086] The system design allows for easier centralized control and management, improving operational convenience.

[0087] In one embodiment, the above-mentioned main control chip 40 is used to calculate the corresponding pressure according to the pressure data using a fuzzy PID algorithm, and to generate a pressure adjustment signal and a negative pressure control signal using an adaptive control method, and to transmit the pressure adjustment signal to the positive and negative pressure control module 20, and to transmit the negative pressure control signal to the degassing lung control module 10.

[0088] In this embodiment, the centralized control of the pressure of all inkjet cartridge air circuits involves unified management of the air circuit pressure of each inkjet cartridge. The pressure data of each air circuit is collected in real time by a pressure sensor, and then processed using a fuzzy PID algorithm. This algorithm combines the advantages of fuzzy logic and PID controller, making the system more flexible and accurate in handling complex and nonlinear pressure changes.

[0089] Specifically, the pressure sensor of each inkjet cartridge continuously monitors and records the real-time pressure value of the air circuit; the collected pressure data is input into the fuzzy PID control algorithm. Fuzzy logic helps to deal with complex and uncertain situations, while the PID algorithm is responsible for accurately adjusting the pressure. According to the algorithm calculation results, the pressure of the air circuit is adjusted to ensure that the pressure of all inkjet cartridges is maintained within the ideal range; the fuzzy PID algorithm can more accurately respond to nonlinear and dynamic changes in pressure and improve overall control accuracy; through centralized control, the pressure stability of each air circuit can be better maintained and system fluctuations can be reduced; precise pressure control helps to improve inkjet quality and ensure ink jet consistency; centralized control systems make pressure management more efficient and convenient, reducing the need for maintenance of multiple independent systems.

[0090] In this embodiment, the adaptive control method is mainly used to control the ink pressure and the negative pressure at the inkjet head in the intelligent cloth pressing printing machine, wherein the adaptive control method includes the following methods:

[0091] Model Reference Adaptive Control (MRAC): Automatically adjust controller parameters to match the reference model. It is suitable for situations where the system dynamic characteristics are known but there are parameter changes. In this embodiment, a reference model is created to simulate the airway pressure changes of the inkjet head, and the parameters of the lung negative pressure and airway pressure controllers are adjusted according to the deviation between the actual system and the reference model.

[0092] Self-correcting control (SCC): adjusts the controller by estimating system parameters, which is suitable for systems where it is difficult to directly measure parameters. In this embodiment, in actual operation, the negative lung pressure and the positive and negative pressure controllers in the airway are dynamically adjusted by estimating the pressure characteristics of the airway (such as flow changes, air pressure fluctuations) in real time to cope with the situation where the parameters cannot be directly measured.

[0093] Minimum Variance Control (MVC): The controller is adjusted to minimize the error variance, which is applicable to situations where the system is subject to random disturbances. In this embodiment, the controller parameters are adjusted to minimize the variance of the inkjet head air pressure, thereby reducing the impact of random disturbances on the inkjet effect, such as pressure fluctuations caused by changes in ink viscosity.

[0094] Adaptive PID control: Automatically adjust the proportional, integral and differential parameters of the PID controller to adapt to changes in system performance. In this embodiment, the proportional, integral and differential parameters of the PID controller are automatically adjusted to adapt to pressure changes in the air circuit, such as in inkjet or cleaning mode, to optimize lung negative pressure and positive and negative pressure control in real time.

[0095] Specifically, adaptive PID control is mainly used in inkjet printers to adjust the air path pressure of the inkjet head, including lung negative pressure and positive and negative pressure control. PID (proportional-integral-differential) controller is the most common type of feedback controller, suitable for many control tasks, but its performance depends on the precise adjustment of parameters. In the inkjet system, the change of air pressure will be affected by factors such as ink viscosity and ambient temperature, which requires the PID controller to dynamically adjust its parameters to maintain the best control effect.

[0096] The specific process includes the following:

[0097] First, the adaptive PID controller can dynamically adjust the proportional (P), integral (I) and differential (D) parameters according to the actual inkjet head air pressure changes. For example, when the air path pressure of the inkjet head fluctuates due to changes in ink viscosity, the adaptive PID controller detects these changes in real time and automatically adjusts the PID parameters to optimize the control effect. This ensures the consistency of inkjet results even when operating conditions change.

[0098] Secondly, inkjet printers usually have different working modes, such as inkjet mode and cleaning mode. In inkjet mode, high control accuracy is required to ensure uniform ink jetting; in cleaning mode, the control requirements are different. The adaptive PID controller can automatically switch parameter settings according to different operating modes, thereby ensuring stability and performance in each mode.

[0099] Finally, the adaptive PID controller has online learning and optimization capabilities, which can continuously optimize its parameter settings through real-time analysis of system responses. For example, when detecting the changing trend of the air pressure of the inkjet head, the controller will adjust the parameters to adapt to these changes, thereby reducing the impact of pressure fluctuations on the inkjet effect.

[0100] Gain Scheduling: Adjust the control gain based on key parameters (such as speed, ink viscosity), which is suitable for systems whose performance varies with operating conditions. In this embodiment, the control gain is adjusted according to parameters such as ink viscosity and inkjet speed to optimize the airway pressure and lung negative pressure under different operating conditions.

[0101] Adaptive predictive control: Combining predictive and adaptive control, predicting future errors based on the system model and adjusting control actions, suitable for complex systems. In this embodiment, the predictive model is used to predict the trend of airway pressure changes, and the control actions are adjusted based on these predictions, such as predicting ink residue in the cleaning mode and adjusting the lung negative pressure to adapt to the cleaning needs.

[0102] Neural network adaptive control: Using neural networks to process complex nonlinear systems is suitable for situations that are difficult to handle with traditional methods. In this embodiment, the nonlinear air pressure characteristics of the inkjet head are processed by training a neural network model to deal with complex pressure change problems that are difficult to solve with traditional control methods.

[0103] Specifically, neural network adaptive control uses machine learning technology to deal with complex nonlinear system problems. In inkjet printers, the air path pressure of the inkjet head is affected by multiple factors, including ink viscosity, air flow fluctuations, etc. These factors may lead to complex pressure change problems that are difficult to handle with traditional control methods. Neural network adaptive control can deal with these complex problems by training network models and provide efficient control strategies.

[0104] The specific process includes:

[0105] Neural networks are able to build a nonlinear model of the air path pressure of the inkjet head. By training a large amount of data on the system's input (such as ink flow, air flow velocity) and output (such as inkjet head air pressure), the neural network can capture complex nonlinear relationships. This enables the controller to more accurately predict and adjust the air path pressure to cope with nonlinear characteristics.

[0106] The neural network adaptive controller can adjust the control strategy in real time during actual operation. For example, when the air pressure of the inkjet head changes suddenly due to environmental changes or fluctuations in ink properties, the controller will adjust the control signal based on the neural network's predictive model to maintain a stable inkjet effect.

[0107] The neural network adaptive controller has the ability to learn, extract patterns from historical operation data and continuously improve the control strategy. Over time, the controller will become smarter and more accurate. For example, during the inkjet process, the neural network can gradually adapt to the characteristics of different inks to optimize the inkjet effect.

[0108] Neural networks can effectively handle complex interference factors such as airflow fluctuations and ink quality fluctuations. Through training and adaptation, neural networks can provide more robust control strategies to cope with these interference factors and maintain the stability and consistency of the inkjet system.

[0109] Sliding mode variable structure control: Change the control structure when the state switches, which is suitable for systems with uncertainty and interference. In this embodiment, when the airway pressure and lung negative pressure change suddenly, the control structure is changed to maintain stability, such as to deal with unexpected airflow fluctuations or negative pressure changes.

[0110] Adaptive robust control: Design the controller to maintain performance while dealing with parameter changes and external disturbances, suitable for applications requiring high precision. In this example, the controller is designed to maintain the stability and precision of the inkjet system while dealing with system parameter changes and external disturbances (such as temperature changes, ink quality fluctuations).

[0111] Adaptive fuzzy control: Combining fuzzy logic and adaptive control to handle system uncertainty is suitable for systems that are difficult to accurately model. In this embodiment, fuzzy logic is combined to handle the complex uncertainty of airway pressure and lung negative pressure, such as adjusting control parameters according to fuzzy rules in different inkjet modes.

[0112] Data-driven adaptive control: Use historical data and machine learning techniques to adjust the control strategy, suitable for situations where data is abundant but the model is unclear. In this embodiment, historical operation data and machine learning techniques are used to adjust the lung negative pressure and airway pressure control strategies to adapt to situations where data is abundant but the model is unclear.

[0113] Event-triggered adaptive control: Control parameter adjustment is triggered by specific events such as sudden changes in system status, which is suitable for situations where rapid response to system changes is required. In this embodiment, the adjustment of control parameters is triggered by sudden changes in system status (such as inkjet head clogging or ink supply interruption), ensuring that the system responds quickly and resumes normal operation.

[0114] In one embodiment, see Figure 4 and Figure 5 The above-mentioned printing machine includes a control interface, which is used to display all real-time monitoring information of air pressure, wherein all real-time monitoring information of air pressure includes monitoring information of external air pressure, positive pressure, lung negative pressure, first negative pressure and second negative pressure.

[0115] The control interface can display air pressure, working status and alarm information in real time, allowing operators to quickly understand the operating status of the system; through the integrated display and control interface, operators can easily set working conditions, monitor system status and troubleshoot.

[0116] Among them, the external air pressure is collected by an external air source sensor 31 arranged on the air circuit main control board. Specifically, the inkjet printing machine air circuit centralized control system also includes an external air source and an external air source sensor 31. The external air source provides gas for the solenoid valves outside the ink circuit in the printing machine, including cylinder solenoid valves for ink pressing, water tanks, and ink scraping; the external air source sensor 31 is used to collect the external air pressure of the external air source and send it to the main control chip 40; the reason for using an external air source is that the air pressure required by the solenoid valve is relatively high.

[0117] In the design of the printing machine, the structural design of the scraper and the nozzle is optimized. Among them, the nozzle part includes the inkjet head. The scraper is close to the surface of the inkjet head and cleans the inkjet head by applying squeezing force. When the surface pressure of the inkjet head reaches the predetermined condition, this design significantly improves the cleaning effect of the scraper. Compared with the traditional cleaning structure, this improvement makes the cleaning efficiency significantly improved.

[0118] During the cleaning process of the printing machine's nozzles, the air path centralized control system of the inkjet printing machine needs to accurately adjust the air path direction and air pressure to ensure that the inkjet head can be effectively cleaned and maintain the inkjet effect when switching modes. The entire control process of the air path centralized control system of the inkjet printing machine includes:

[0119] When switching from the normal inkjet module to the cleaning mode, the control system first needs to adjust the direction of the air path; the two-way valve 90 at the outlet of the positive pressure pump 74 will be opened, while the two-way valves 90 at the outlets of the first negative pressure pump 71 and the second negative pressure pump 76 will be closed; this operation causes the inkjet head to begin to receive positive pressure;

[0120] When the inkjet head receives positive pressure, the positive pressure sensor 35 in the pressure sensing module 30 will monitor the pressure data, and the control system will continue to adjust until the positive pressure reaches the set standard.

[0121] After the positive pressure stabilizes, the scraper moves from one side of the inkjet head to the other; the scraper is pressed against the inkjet surface and applies pressure to clean the ink and residue; this process relies on the effective coordination of positive pressure and scraper to ensure thorough cleaning of the inkjet head.

[0122] Secondly, when the cleaning mode is switched back to the normal inkjet mode, the air pressure of the inkjet head needs to be quickly restored from the positive pressure state to the negative pressure. If the pressure conversion is inaccurate, it may cause ink splashing and affect the printing effect.

[0123] In general, the entire control process includes a normal inkjet mode and a cleaning mode. Specifically, in the normal inkjet mode, the printer turns on the first negative pressure pump 71 and the second negative pressure pump 76. These two pumps provide the required negative pressure for the ink cartridges of different colors respectively to ensure that the ink of each color can be evenly supplied to the nozzle; the degassing lung (or bubble filter) also needs to be kept open, and its purpose is to remove bubbles from the ink; the pressure of the degassing lung should be controlled at about -90kPa, so as to ensure that the ink in the ink path does not contain bubbles, thereby preventing bubbles in the inkjet process from causing uneven printing or nozzle clogging. Each negative pressure pump controls the flow of ink in the corresponding color ink cartridge by adjusting its negative pressure value. The operation of these negative pressure pumps ensures a stable supply of ink and helps maintain a stable inkjet state of the nozzle; the control system will continuously monitor and adjust the negative pressure in the air path to ensure that the nozzle is in a stable inkjet state, ensuring printing quality and accuracy.

[0124] When in cleaning mode, the degassing lung remains in working condition to remove bubbles in the cleaning fluid. However, the pressure setting of the degassing lung may be adjusted to suit the needs during the cleaning process; the control system switches the air pressure supplied by the ink cartridge from negative pressure to positive pressure by controlling the valve of the two-way valve 90. The supply of positive pressure pushes the dirty ink at the ink head out to help remove the residual ink in the printhead; when the dirty ink at the ink head is pushed out, the scraper starts to move, and the scraper moves back and forth along the surface of the printhead to thoroughly remove the residual contaminants on the printhead. This operation ensures that the printhead can be restored to the best working condition after cleaning. During the cleaning process, the control system needs to accurately control the application of positive pressure and quickly restore the negative pressure state after the cleaning is completed. This conversion needs to be accurate and correct to avoid bubbles or other printing problems in the inkjet head.

[0125] Through this detailed air circuit control and pressure adjustment, the printer can ensure that it maintains the best working condition during normal inkjet and cleaning processes, thereby improving the printing quality and the service life of the equipment.

[0126] In one embodiment, when switching from the normal inkjet mode to the cleaning mode, the air pressure of the inkjet head needs to be quickly switched from the negative pressure state to the positive pressure. If this switch is not fast or accurate enough, the dirty ink may not be completely removed, resulting in poor cleaning effect. In addition, in order to optimize the pressure conversion, the control system solves these problems by adjusting the lung negative pressure. When switching to the cleaning mode, the lung negative pressure will increase moderately. For example, from -90 kPa to -89 kPa, which can reduce the resistance of ink flow and cooperate with the positive pressure provided by the positive pressure pump 74 to quickly reach the pressure required for cleaning.

[0127] In addition, when returning to the normal inkjet mode from the cleaning mode, the lung negative pressure will be moderately reduced, for example, from -89 kPa to -90 kPa. This operation will increase the flow resistance of the ink and cooperate with the negative pressure provided by the first negative pressure pump 71 and the second negative pressure pump 76 to quickly restore the negative pressure state required by the inkjet head.

[0128] In this way, the control system can ensure that the air pressure state of the printhead in different modes is accurately controlled, thereby achieving efficient cleaning and stable inkjet operation.

[0129] The control system of this embodiment integrates the air lung, positive pressure pump 74 and two negative pressure pumps into one air circuit main control board (PCB board), realizing the centralized collection and analysis of air pressure data of the ink supply system and the inkjet head. Compared with independent settings, this integrated method can analyze data more quickly and accurately, and realizes the air pressure control coupling between the ink supply system and the inkjet head, thereby reducing the air pressure fluctuation caused by mode conversion and improving the stability and reliability of the system. The centralized air circuit module is integrated on the main control board to improve the speed and accuracy of signal transmission, and uses chip-level sensors to reduce costs and speed up detection, while simplifying installation and use. The control system reduces the number of components that need to be purchased and maintained separately, thereby reducing initial and long-term maintenance costs, simplifying system manufacturing and assembly, and reducing production costs. Through centralized control, technicians only need to focus on one control panel, simplifying the maintenance and troubleshooting process. In addition, the system adjusts the air pressure in a digital way, realizes more accurate air pressure control, automatically monitors and adjusts the air pressure, and improves the ease of operation and consistency of printing quality.

[0130] In one embodiment, the control system can preset various working conditions, such as normal air pressure range, inkjet volume, etc., to ensure that the system operates under optimal conditions; the air circuit main control board is equipped with high and low air pressure alarms, timeout alarms and other functions, which can monitor the system status in real time. Once an abnormality occurs, the system will automatically sound an alarm and suspend printing or ink supply to protect the equipment from damage; when the air pressure exceeds the preset range, the system will sound an alarm; if an operation exceeds the preset time limit, the system will also sound an alarm;

[0131] The gas circuit main control board can be easily connected to the data acquisition and remote monitoring system. Simply add a DTU module to the gas circuit main control board to achieve remote data transmission and monitoring, convenient for real-time acquisition of system status and remote fault diagnosis; the collected data can be used to analyze and optimize system performance, help discover potential problems in advance and improve operating procedures.

[0132] The above-mentioned inkjet printing machine air circuit centralized control system is provided with an air circuit main control board, which includes a degassing lung control module 10, a positive and negative pressure control module 20, a pressure sensing module 30 and a main control chip 40. The degassing lung in the printing machine is connected to the lung negative pressure pump 73 through a trachea, the degassing lung control module 10 is connected to the lung negative pressure pump 73, the pressure sensing module 30 monitors the pressure in the air circuit in real time, and transmits the data to the main control chip 40, the main control chip 40 generates an adjustment signal according to the pressure data, adjusts the positive and negative pressure control module 20 and the degassing lung control module 10, the positive and negative pressure control module 20 adjusts the ink cartridge pressure to meet the demand, and the degassing lung control module 10 ensures the removal of bubbles in the ink; so as to solve the problems that the existing air circuit system is complex and difficult to operate, has high energy consumption, insufficient flow, high maintenance cost and difficult debugging.

[0133] In one embodiment, a control method executed by the above-mentioned air circuit centralized control system of the inkjet printing machine is also provided, comprising:

[0134] When the printing machine is in the normal inkjet mode, the main control chip 40 drives the positive and negative pressure control module 20 and the degassing lung control module 10, so that the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module 20 are turned on, and the pump controlled by the degassing lung control module 10 is turned on;

[0135] When the printing machine switches from the normal inkjet mode to the cleaning mode, the main control chip 40 drives the degassing lung control module 10 and the positive and negative pressure control module 20, so that the pump controlled by the degassing lung control module 10 continues to work, the positive pressure pump 74 controlled by the positive and negative pressure control module 20 works, and the first negative pressure pump 71 and the second negative pressure pump 76 controlled by the positive and negative pressure control module 20 are turned off;

[0136] When the printing machine switches from the cleaning mode to the normal inkjet mode, the main control chip 40 drives the degassing lung control module 10 and the positive and negative pressure control module 20, so that the pump controlled by the degassing lung control module 10 continues to work, the positive pressure pump 74 controlled by the positive and negative pressure control module 20 is turned off, and the first negative pressure pump 71 and the second negative pressure pump 76 controlled by the positive and negative pressure control module 20 work.

[0137] It should be noted that technicians in the relevant field can clearly understand that the specific implementation process of the control method executed by the above-mentioned inkjet printing machine air circuit centralized control system can refer to the corresponding description in the aforementioned system embodiment, and for the convenience and brevity of description, it will not be repeated here.

[0138] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A centralized air circuit control system for an inkjet printing machine, characterized in that: It includes an air circuit main control board, on which a degassing lung control module, a positive and negative pressure control module, a pressure sensing module and a main control chip are integrated; a degassing lung is arranged in the printing machine, the degassing lung is connected to a trachea, and a lung negative pressure pump is connected to the trachea; the degassing lung control module is connected to the lung negative pressure pump; The pressure sensing module is used to monitor the pressure data in each gas path of the printing machine in real time and transmit the pressure data to the main control chip; The main control chip is used to generate a pressure adjustment signal and a negative pressure control signal according to the pressure data, and transmit the pressure adjustment signal to the positive and negative pressure control module, and transmit the negative pressure control signal to the degassing lung control module; The positive and negative pressure control module is used to adjust the positive and negative pressures of the ink cartridge according to the pressure adjustment signal to meet the requirements of the inkjet and cleaning modes; The degassing lung control module is used to control the lung negative pressure pump to provide a negative pressure working gas source to the degassing lung according to the negative pressure control signal, so that the degassing lung removes bubbles in the ink; The gas circuit main control board is also integrated with a communication module and a power supply module; Wherein, the power supply module is used to provide power to the degassing lung control module, the positive and negative pressure control module, the pressure sensing module and the main control chip; The main control chip is connected to the external device through the communication module; The gas circuit main control board is also integrated with an external gas source and an external gas source sensor; the external gas source is used to provide gas to the solenoid valve outside the ink circuit in the printing machine; the external gas source sensor is used to collect the external gas pressure of the external gas source and send it to the main control chip; The main control chip is used to calculate the corresponding pressure according to the pressure data using a fuzzy PID algorithm, and to generate a pressure adjustment signal and a negative pressure control signal using an adaptive control method, and to transmit the pressure adjustment signal to the positive and negative pressure control module, and to transmit the negative pressure control signal to the degassing lung control module; The positive and negative pressure control module includes a first negative pressure control unit, a second negative pressure control unit, and a positive pressure control unit; the first negative pressure control unit is connected to a first negative pressure pump in the printing machine; the second negative pressure control unit is connected to a second negative pressure pump in the printing machine; the positive pressure control unit is connected to a positive pressure pump in the printing machine, and the positive pressure pump is connected to an inkjet head; Wherein, the first negative pressure control unit is used to control the working state of the first negative pressure pump to control the negative pressure provided by the first negative pressure pump to the color ink cartridge in the printing machine; The second negative pressure control unit is used to control the working state of the second negative pressure pump to control the negative pressure provided by the second negative pressure pump to the white ink cartridge in the printing machine; The positive pressure control unit is used to control the positive pressure pump to provide positive pressure during the cleaning process, so that the ink is squeezed out from the inkjet head to unclog the clogged inkjet head; When switching from inkjet mode to cleaning mode, the lung negative pressure increases moderately; when switching from cleaning mode to inkjet mode, the lung negative pressure decreases moderately.

2. The air circuit centralized control system of an inkjet printing machine according to claim 1, characterized in that: The negative pressure provided by the first negative pressure pump ranges from -16 kPa to 0 kPa; the positive pressure provided by the positive pressure pump ranges from 0 kPa to 40 kPa.

3. The centralized air circuit control system of an inkjet printing machine according to claim 2, characterized in that: The lung negative pressure pump provides a negative pressure range of -80 KPa to -90 KPa.

4. The centralized air circuit control system for an inkjet printing machine according to claim 3, characterized in that: The first negative pressure pump and the second negative pressure pump are connected to 5L gas tanks respectively, the lung negative pressure pump is connected to a 0.5L gas tank, and the positive pressure pump is connected to a 1L gas tank.

5. The centralized air circuit control system for an inkjet printing machine according to claim 3, characterized in that: The trachea connected to the first negative pressure pump, the trachea connected to the second negative pressure pump, the trachea connected to the lung negative pressure pump and the trachea connected to the positive pressure pump are respectively provided with two-way valves; the trachea connected to the first negative pressure pump, the trachea connected to the second negative pressure pump and the trachea connected to the positive pressure pump are also respectively provided with adjustment valves, and the trachea connected to the first negative pressure pump and the trachea connected to the second negative pressure pump are respectively connected to negative pressure gauges.

6. The centralized air circuit control system for an inkjet printing machine according to claim 1, characterized in that: The printing machine includes a control interface, which is used to display all real-time monitoring information of air pressure, wherein all real-time monitoring information of air pressure includes monitoring information of external air pressure, positive pressure, lung negative pressure, first negative pressure and second negative pressure.

7. A control method executed by the air path centralized control system of an inkjet printing machine according to any one of claims 1 to 6, characterized in that: include: When the printing machine is in normal inkjet mode, the main control chip drives the positive and negative pressure control module and the degassing lung control module, so that the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module are turned on, and the pump controlled by the degassing lung control module is turned on; When the printing machine switches from the normal inkjet mode to the cleaning mode, the main control chip drives the degassing lung control module and the positive and negative pressure control module, so that the pump controlled by the degassing lung control module continues to work, the positive pressure pump controlled by the positive and negative pressure control module works, and the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module are turned off; When the printing machine switches from cleaning mode to normal inkjet mode, the main control chip drives the degassing lung control module and the positive and negative pressure control module, so that the pump controlled by the degassing lung control module continues to work, the positive pressure pump controlled by the positive and negative pressure control module is turned off, and the first negative pressure pump and the second negative pressure pump controlled by the positive and negative pressure control module work.

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