Ink jet control method, ink supply system, storage medium and computer program product

Abstract

The invention discloses an ink jet control method, an ink supply system, a storage medium and a computer program product, and relates to the technical field of ink jet printing. By designing an ink supply system with layered multi-stage ink paths and designing an ink-jet control method integrating pump control, pneumatic control and valve control, the pressure difference between branch lines branched from the same main ink path is reduced, the ink supply pressure at a nozzle inlet is ensured to be uniform, and the control precision and the response speed of the ink supply system are improved. Therefore, the stability and uniformity of multi-nozzle large-size ink-jet printing are improved, and the jetted ink droplets approach to an ideal state as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of inkjet printing, and in particular to an inkjet control method, an ink supply system, a storage medium and a computer program product. Background Art

[0002] In the existing inkjet printing technology, the ink supply system is a key factor affecting the printing quality. The traditional ink supply system usually uses a single inlet, and multiple branches are connected to the nozzles through a main ink path. As the number of nozzles in the ink supply system increases, the pressure difference between the branches of the same main ink path becomes larger; the ink supply pressure at the inlet of each nozzle is uneven, affecting the consistency of ink droplet speed and ink dot position; the ink supply system lacks real-time pressure monitoring and intelligent adjustment capabilities, and responds slowly; the layered multi-level ink path has large flow resistance, and it is easy to have insufficient power at the end of the nozzle. These problems are particularly obvious in the process of multi-nozzle large-size inkjet printing, resulting in poor uniformity of the finished product. Summary of the invention

[0003] The main purpose of this application is to provide an inkjet control method, ink supply system, storage medium and computer program product, aiming to solve the technical problems that the stability and uniformity of large-size inkjet printing with multiple nozzles are poor and the ejected ink droplets are in a non-ideal state.

[0004] To achieve the above-mentioned purpose, the present application proposes an inkjet control method, which is applied to an ink supply system, wherein a circulating ink supply path of the ink supply system includes an ink supply bottle, a layered multi-level ink path, a nozzle, a circulating ink bottle, an adjustable speed pump, and an ink supply bottle, wherein the layered multi-level ink path is divided into two or more ink paths at each level, and a one-to-two or one-to-more intelligent valve is provided at the bifurcation of the ink path, and an air pressure chamber is provided at the nozzle inlet of the last level of the ink path; the inkjet control method includes: Determining a pending pump speed adjustment amount of the adjustable speed pump based on a liquid level between the circulating ink bottle and the ink supply bottle; Determining the pending adjustment degree of the intelligent valve based on the ink path flow of the bifurcated ink paths at each level of the layered multi-level ink paths; Determining a pending pressurization value of the air pressure chamber based on an inlet pressure of the nozzle; By integrating and controlling the adjustable speed pump, the intelligent valve and the air pressure chamber, the target pump speed adjustment amount corresponding to the to-be-determined pump speed adjustment amount, the target adjustment degree corresponding to the to-be-determined adjustment degree and the target pressurization value corresponding to the to-be-determined pressurization value are determined.

[0005] In one embodiment, the step of determining the target pump speed adjustment amount corresponding to the pending pump speed adjustment amount by integrating control of the adjustable speed pump, the intelligent valve and the air pressure chamber comprises: Determine a first control weight corresponding to the liquid level based on the liquid level, the ink path flow rate, the inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the smart valve, and the air pressure chamber; Based on the first control weight corresponding to the liquid level, the to-be-determined pump speed adjustment amount, the to-be-determined pressurization value and the integral compensation parameter of air pressure control on pump speed control, the target pump speed adjustment amount corresponding to the to-be-determined pump speed adjustment amount is determined.

[0006] In one embodiment, the step of determining the target adjustment degree corresponding to the undetermined adjustment degree by integrating control of the adjustable speed pump, the intelligent valve and the air pressure chamber comprises: Determine a second control weight corresponding to the ink path flow rate based on the liquid level, the ink path flow rate and the inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the smart valve and the air pressure chamber respectively; Based on the second control weight corresponding to the ink path flow, the to-be-determined adjustment degree, the to-be-determined pump speed adjustment amount, and the differential feedforward parameter of pump speed control on valve control, a target adjustment degree corresponding to the to-be-determined adjustment degree is determined.

[0007] In one embodiment, the step of determining the target pressurization value corresponding to the undetermined pressurization value by integrating control of the adjustable speed pump, the intelligent valve and the air pressure chamber comprises: Determine a third control weight corresponding to the inlet pressure based on the liquid level, the ink path flow rate and the inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the smart valve and the air pressure chamber respectively; Based on the third control weight corresponding to the inlet pressure, the to-be-determined pressurization value, the to-be-determined adjustment degree and the proportional coupling parameter of valve control to air pressure control, a target pressurization value corresponding to the to-be-determined pressurization value is determined.

[0008] In one embodiment, the inkjet control method further includes: Acquiring an initial pressure and an initial flow rate set based on an ejection target, wherein the ejection target is that the shape of ink droplets ejected from the nozzle is in an expected ideal shape; Based on the initial pressure and the initial flow rate, using an ink supply system to eject ink and obtain real-time ink droplet data of the ink droplets; When the real-time ink droplet shape corresponding to the real-time ink droplet data does not meet the injection target, optimizing the initial pressure and the initial flow rate based on the injection target to obtain the real-time pressure and the real-time flow rate; Based on the real-time pressure and the real-time flow rate, an ink supply system is used to eject ink until a real-time ink droplet shape corresponding to new real-time ink droplet data meets the ejection target.

[0009] In one embodiment, the initial pressure or the real-time pressure is used as the adjustment target of the air pressure chamber; the liquid level difference calculated by the initial pressure and the initial flow or the liquid level difference calculated by the real-time pressure and the real-time flow is used as the adjustment target of the adjustable speed pump.

[0010] In one embodiment, after the step of using the ink supply system to eject ink and obtain real-time ink droplet data of ink droplets based on the initial pressure and the initial flow rate, the step further includes: Predicting the status of the sprinkler head based on sprinkler head historical data on the status of the sprinkler head; The initial pressure and the initial flow are optimized based on the injection target and the predicted nozzle state to obtain the real-time pressure and the real-time flow.

[0011] In addition, to achieve the above-mentioned purpose, the present application also proposes an ink supply system, wherein the circulating ink supply path of the ink supply system includes an ink supply bottle, a layered multi-level ink circuit, a nozzle, a circulating ink bottle, an adjustable speed pump, and an ink supply bottle which are passed through in sequence, wherein the layered multi-level ink circuit is divided into one-to-two or one-to-many ink circuits at each level, and a one-to-two or one-to-many intelligent valve is provided at the bifurcation of the ink circuit, and an air pressure chamber is provided at the nozzle inlet of the last-level ink circuit; the ink supply system also includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program is configured to implement the steps of the inkjet control method as described above.

[0012] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the inkjet control method described above are implemented.

[0013] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the inkjet control method described above are implemented.

[0014] One or more technical solutions proposed in this application have at least the following technical effects: In the present application, an ink supply system is provided, in which a circulating ink supply path includes an ink supply bottle, a layered multi-level ink path, a nozzle, a circulating ink bottle, an adjustable speed pump, and an ink supply bottle, which pass through in sequence, wherein the layered multi-level ink path is divided into two or more ink paths at each level, and a one-to-two or one-to-more intelligent valve is provided at the bifurcation of the ink path, and an air pressure chamber is provided at the nozzle inlet of the last level of the ink path.

[0015] In the present application, an inkjet control method applied to the above-mentioned ink supply system is provided, in which method, first, a pending pump speed adjustment amount of an adjustable-speed pump is determined based on the liquid level between a circulating ink bottle and an ink supply bottle; a pending adjustment degree of an intelligent valve is determined based on the ink flow rate of a branched ink path at each level of a layered multi-level ink path; and a pending pressurization value of an air pressure chamber is determined based on the inlet pressure of a nozzle; then, a target pump speed adjustment amount corresponding to the pending pump speed adjustment amount, a target adjustment degree corresponding to the pending adjustment degree, and a target pressurization value corresponding to the pending pressurization value are determined through integrated control of the adjustable-speed pump, the intelligent valve, and the air pressure chamber.

[0016] Therefore, by designing an ink supply system with a layered multi-level ink path and designing an inkjet control method that integrates pump control, air control and valve control, the pressure difference between the branches of the same main ink path is reduced, the ink supply pressure at the nozzle inlet is ensured to be uniform, and the control accuracy and response speed of the ink supply system are improved. In this way, the stability and uniformity of multi-nozzle large-size inkjet printing are improved, and the ejected ink droplets are as close to the ideal state as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A system schematic diagram provided for the first embodiment of the ink supply system of the present application; Figure 2 A schematic diagram of an ink path provided for the ink supply system embodiment 1 of the present application; Figure 3 A schematic diagram of a flow chart provided for the first embodiment of the inkjet control method of the present application; Figure 4 A schematic diagram of a flow chart provided for the second embodiment of the inkjet control method of the present application; Figure 5 An application schematic diagram provided for the second embodiment of the inkjet control method of the present application; Figure 6 Schematic diagram of the device structure of the hardware operating environment involved in the inkjet control method in the embodiment of the present application.

[0020] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0022] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The present application embodiment provides an ink supply system, referring to Figure 1 and Figure 2 , Figure 1 A system schematic diagram of the ink supply system embodiment 1 of the present application is provided. Figure 2 This is a schematic diagram of the ink path provided in Example 1 of the ink supply system of the present application.

[0024] The circulating ink supply path of the ink supply system includes an ink supply bottle, a layered multi-level ink path, a nozzle, a circulating ink bottle, an adjustable speed pump, and an ink supply bottle, which are passed through in sequence. The layered multi-level ink path is divided into two or more ink paths at each level, and a one-to-two or one-to-more intelligent valve is provided at the bifurcation of the ink path, and an air pressure chamber is provided at the nozzle inlet of the last level of the ink path.

[0025] The ink supply system adopts a layered multi-level ink path design. Each level of the ink path is divided into two or more. The ink tubes of each level of the ink path are the same length. A micro solenoid valve is used as an intelligent valve to intelligently adjust the outlet flow rate and evenly distribute the ink to the inlet of each nozzle through the multi-level ink path.

[0026] Liquid level sensors are installed at the ink supply bottle (main ink bottle) and the circulating ink bottle (recovery ink bottle) respectively to monitor the liquid level of the two ink bottles in real time, which is used as feedback data for the pump control system. Regarding the pump control system: a circulating ink path is set between the ink supply bottle and the circulating ink bottle, and an adjustable speed pump is set in the middle of the circulating ink path. By controlling the adjustable speed pump, the pressure difference between the ink supply bottle and the circulating ink bottle is kept stable and meets the inkjet requirements.

[0027] Furthermore, on the basis of the layered multi-level ink circuit, an intelligent regulating element, namely an intelligent valve, is introduced, and a micro solenoid valve is set at each bifurcation point of the layered multi-level ink circuit as an intelligent valve. According to the working status and needs of the nozzle, the ink flow and pressure of each branch are dynamically adjusted to further improve the uniformity and flexibility of ink distribution.

[0028] An air pressure chamber is set at the entrance of the nozzle. Furthermore, a pressure sensor can be installed behind the air pressure chamber. By dynamically adjusting the air pressure of the last ink path where the nozzle is located, it can quickly respond to problems such as different pressures at the nozzle caused by pressure fluctuations in the ink supply system and insufficient power caused by excessive flow resistance. When the ink supply is stopped, compressed air can be introduced into the ink path through the air pressure chamber to remove bubbles and ink stains in the ink path.

[0029] In one embodiment, a pressure sensor may be installed on each branch line of the ink circuit to monitor the pressure of each branch line in real time, and an alarm may be issued when an abnormal pressure is detected, so as to prompt timely fault detection and adjustment of the ink supply system. A defoaming device, i.e., an ink bubble elimination device, may be added at the inlet of the circulating ink bottle to ensure that there is no bubble interference in the ink supply system to avoid problems such as nozzle blockage and uneven printing. In addition, there is the following safety protection mechanism: when abnormalities occur in the pump control, air control, and valve control, the ink supply system automatically alarms and switches to a safe mode to prevent damage to the nozzle.

[0030] In addition, a nozzle ink droplet monitoring system can be set up corresponding to the nozzle spraying area, and a high-speed camera system or optical sensor can be used to monitor the ink droplets ejected from the nozzle. The ink droplet status can be analyzed in combination with a computer vision algorithm, such as analyzing the ink droplet diameter, speed and distribution uniformity, identifying ink droplet abnormalities (such as offset, breakage, unevenness, etc.), and providing real-time feedback to the closed-loop control system. A deep learning model can also be used to predict the trend of ink droplet changes and improve inkjet stability. The closed-loop control system combines the nozzle ink droplet monitoring data to dynamically adjust the pressure, flow rate and other parameters of the ink supply system. It uses intelligent PID control or fuzzy control to keep the ink droplet characteristics stable. Add a digital twin model to optimize the injection parameters based on historical data and improve system adaptability.

[0031] Based on the above ink supply system, the present application embodiment provides an inkjet control method, referring to Figure 3 , Figure 3 This is a flow chart of the first embodiment of the inkjet control method of the present application.

[0032] In this embodiment, the inkjet control method is applied to the above ink supply system, and the inkjet control method includes steps S10 to S40: Step S10, determining a pending pump speed adjustment amount of the adjustable speed pump based on the liquid level between the circulating ink bottle and the ink supply bottle; In pump control, the pump speed is dynamically adjusted according to the real-time detected liquid level heights of the ink supply bottle and the circulating ink bottle to maintain the liquid level difference between the ink supply bottle and the circulating ink bottle, thereby achieving a stable flow pressure difference. In one embodiment, the formula of the PID control algorithm is as follows: U(t)=K_p·e(t)+K_i·∫[e(t)d(t)]+K_d·d / dt e(t), where U(t) is the undetermined pump speed adjustment amount of the adjustable speed pump, e(t) is the difference between the actual liquid level difference and the target liquid level difference between the main ink bottle and the circulating ink bottle, and K_p, K_i, and K_d are proportional, integral, and differential coefficients, respectively.

[0033] Step S20, determining the pending adjustment degree of the intelligent valve based on the ink flow rate of the bifurcated ink path at each level of the layered multi-level ink path; In valve control, the ink path bifurcated joint is set as an electromagnetic deformation structure, and the PID control algorithm is used to automatically adjust the valve degree according to the real-time pressure distribution, so as to dynamically compensate for the change in flow resistance caused by the difference in working state of the link structure and the ink path pipeline. In one embodiment, the formula of the PID control algorithm is as follows: U1(t)=K1_p·e1(t)+K1_i·∫[e1(t)d(t)]+K1_d·d / dt e1(t), where U1(t) is the undetermined adjustment degree of the intelligent valve, e1(t) is the deviation between the flow ratio of two or more ink paths at the outlet and the target value, and K1_p, K1_i, and K1_d are proportional, integral, and differential coefficients, respectively. It should be noted that the working goal of the intelligent valve or the purpose of setting the intelligent valve is to make the multiple bifurcated ink paths after the intelligent valve have the same flow rate. Therefore, the target value in e1(t) corresponding to the ratio is 1, that is, to make the flow ratio of two or more ink paths close to 1.

[0034] Step S30, determining a pending pressurization value of the air pressure chamber based on the inlet pressure of the nozzle; In the air control, the pressure data fed back by the pressure sensor on the last level of the ink path is combined, and the PID control algorithm is used for fine-tuning, and the auxiliary air pressure is added to the low-pressure branch to quickly balance the pressure of each branch, so as to ensure that the ink supply pressure of each nozzle reaches the target value when ink is sprayed, so as to achieve a high consistency of the ink droplet speed and position of each nozzle. In one embodiment, the formula of the PID control algorithm is as follows: U2(t)=K2_p·e2(t)+K2_i·∫[e2(t)d(t)]+K2_d·d / dt e2(t), where U2(t) is the undetermined pressurization value of the air pressure chamber, e2(t) is the deviation between the nozzle inlet pressure and the target pressure value, and K2_p, K2_i, and K2_d are proportional, integral, and differential coefficients, respectively.

[0035] Step S40, by integrating the control of the adjustable speed pump, the intelligent valve and the air pressure chamber, determine the target pump speed adjustment amount corresponding to the to-be-determined pump speed adjustment amount, the target adjustment degree corresponding to the to-be-determined adjustment degree and the target pressurization value corresponding to the to-be-determined pressurization value.

[0036] On the basis of relying on pressure sensors for PID air control, relying on flow sensors for PID valve control, and relying on liquid level sensors for PID pump control, the respectively determined adjustment amounts are used as the pending pump speed adjustment amount, the pending adjustment degree, and the pending pressurization value, and the adjustable speed pump, the intelligent valve, and the air pressure chamber are further integrated and controlled instead of being controlled separately to determine the target pump speed adjustment amount corresponding to the pending pump speed adjustment amount, the target adjustment degree corresponding to the pending adjustment degree, and the target pressurization value corresponding to the pending pressurization value.

[0037] By integrating the data from the liquid level sensor, flow rate sensor and pressure sensor, the system status is comprehensively judged, and a coupling algorithm is established to determine the relationship between the stability and uniformity of inkjet printing and the speed of the adjustable speed pump, the valve opening of the intelligent valve and the pressurization pressure of the air pressure chamber. The ink supply system automatically allocates the control weights of pump control, valve control and air control according to the real-time working conditions to obtain the final actual control parameters, namely the target pump speed adjustment amount, target adjustment degree and target pressurization value.

[0038] It should be noted that the basis and principle of the above-mentioned relationship coupling algorithm lies in that the pump speed adjustment amount U(t) of the adjustable speed pump is affected by not only itself but also the pressurization value U2(t) of the air pressure chamber; the adjustment degree U1(t) of the intelligent valve is affected by not only itself but also the pump speed adjustment amount U(t) of the adjustable speed pump; the pressurization value U2(t) of the air pressure chamber is affected by not only itself but also the adjustment degree U1(t) of the intelligent valve.

[0039] In a feasible implementation manner, step S40 includes: Determine a first control weight corresponding to the liquid level based on the liquid level, ink flow and inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the intelligent valve and the air pressure chamber; Based on the first control weight corresponding to the liquid level, the to-be-determined pump speed adjustment amount, the to-be-determined pressurization value and the integral compensation parameter of the air pressure control on the pump speed control, the target pump speed adjustment amount corresponding to the to-be-determined pump speed adjustment amount is determined.

[0040] Regarding pump control, the first control weight wh corresponding to the liquid level can be determined according to the following formula: wh=[exp(-λe(t)) / (exp(-λe(t))+exp(-λ1e1(t))+exp(-λ2e2(t)))] The target pump speed adjustment amount U'(t) corresponding to the undetermined pump speed adjustment amount can be determined according to the following formula: U'(t)=wh·[U(t)+α∫U2(t)dt] Among them, λ, λ1, λ2 are the weight attenuation factors of each subsystem, namely the adjustable speed pump, the intelligent valve and the air pressure chamber (the larger the error, the higher the corresponding subsystem weight), e(t) is the difference between the actual liquid level difference and the target liquid level difference between the main ink bottle and the circulating ink bottle, e1(t) is the deviation between the flow ratio of two or more ink paths at the outlet and the target value, e2(t) is the deviation between the nozzle inlet pressure and the target pressure value, U(t) is the undetermined pump speed adjustment amount of the adjustable speed pump, U2(t) is the undetermined pressurization value of the air pressure chamber, and α is the integral compensation parameter of air control to pump control.

[0041] In another feasible implementation, step S40 includes: Determine a second control weight corresponding to the ink flow rate based on the liquid level, the ink flow rate and the inlet pressure, and the preset weight attenuation factors corresponding to the adjustable speed pump, the intelligent valve and the air pressure chamber; Based on the second control weight corresponding to the ink path flow, the to-be-determined adjustment degree, the to-be-determined pump speed adjustment amount and the differential feedforward parameter of the pump speed control on the valve control, the target adjustment degree corresponding to the to-be-determined adjustment degree is determined.

[0042] Regarding valve control, the second control weight wv corresponding to the ink flow rate can be determined according to the following formula: wv=[exp(-λ1e1(t)) / (exp(-λe(t))+exp(-λ1e1(t))+exp(-λ2e2(t)))] The target adjustment degree U1'(t) corresponding to the undetermined adjustment degree can be determined according to the following formula: U1'(t)=wv·[U1(t)+βdU(t) / dt] Among them, λ, λ1, λ2 are the weight attenuation factors of each subsystem, namely the adjustable speed pump, the intelligent valve and the air pressure chamber (the larger the error, the higher the corresponding subsystem weight), e(t) is the difference between the actual liquid level difference and the target liquid level difference between the main ink bottle and the circulating ink bottle, e1(t) is the deviation between the flow ratio of two or more ink paths at the outlet and the target value, e2(t) is the deviation between the nozzle inlet pressure and the target pressure value, U(t) is the undetermined pump speed adjustment amount of the adjustable speed pump, U1(t) is the undetermined adjustment degree of the intelligent valve, and β is the differential feedforward parameter of pump control to valve control.

[0043] In another feasible implementation, step S40 includes: Determine a third control weight corresponding to the inlet pressure based on the liquid level, ink flow and inlet pressure, as well as preset weight attenuation factors corresponding to the adjustable speed pump, the intelligent valve and the air pressure chamber; Based on the third control weight corresponding to the inlet pressure, the to-be-determined pressurization value, the to-be-determined adjustment degree and the proportional coupling parameter of the valve control to the air pressure control, the target pressurization value corresponding to the to-be-determined pressurization value is determined.

[0044] Regarding gas control, the third control weight wa corresponding to the inlet pressure can be determined according to the following formula: wa=[exp(-λ2e2(t)) / (exp(-λe(t))+exp(-λ1e1(t))+exp(-λ2e2(t)))] The target pressure value U2'(t) corresponding to the undetermined pressure value can be determined according to the following formula: U2'(t)=wa·[U2(t)+γU1(t)] Among them, λ, λ1, λ2 are the weight attenuation factors of each subsystem, namely the speed-adjustable pump, the intelligent valve and the air pressure chamber (the larger the error, the higher the corresponding subsystem weight), e(t) is the difference between the actual liquid level difference and the target liquid level difference between the main ink bottle and the circulating ink bottle, e1(t) is the deviation between the flow ratio of two or more ink paths at the outlet and the target value, e2(t) is the deviation between the nozzle inlet pressure and the target pressure value, U2(t) is the undetermined pressurization value of the air pressure chamber, U1(t) is the undetermined adjustment degree of the intelligent valve, and γ is the proportional coupling parameter of valve control to air control.

[0045] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 and Figure 5 , the inkjet control method further includes steps T10 to T40: Step T10: obtaining an initial pressure and an initial flow rate set based on an ejection target, wherein the ejection target is that the ink droplets ejected from the nozzle are in an expected ideal shape; At the initial control moment of the ink supply system, in order to make the ink droplet state meet the requirements of inkjet printing stability and uniformity, the initial flow rate and pressure can be input based on manual experience and with reference to the injection target, and fusion control and inkjet are performed based on the initial flow rate and pressure, so that the ink droplet shape of the ink droplets ejected from the nozzle is in the expected ideal shape.

[0046] Step T20: Based on the initial pressure and the initial flow rate, use the ink supply system to perform inkjet and obtain real-time ink droplet data of the ink droplets; After obtaining the initial pressure and initial flow rate set based on the ejection target, the ink supply system is used to eject ink and obtain real-time droplet data of the ink droplets based on the initial pressure and initial flow rate. At the same time, the ink droplet observation system monitors the ejected ink droplet state in real time, including the droplet volume and droplet morphology (whether satellite droplets are contained), obtains real-time droplet data of the ejected ink droplets, and compares them with the target droplet volume and droplet morphology corresponding to the ejection target.

[0047] Step T30: when the real-time ink droplet shape corresponding to the real-time ink droplet data does not meet the injection target, the initial pressure and the initial flow rate are optimized based on the injection target to obtain the real-time pressure and the real-time flow rate; Step T40: Based on the real-time pressure and the real-time flow rate, use the ink supply system to perform inkjet until the real-time ink droplet shape corresponding to the new real-time ink droplet data meets the ejection target.

[0048] When the real-time ink droplet shape corresponding to the real-time ink droplet data does not meet the injection target, the initial pressure and the initial flow are optimized based on the injection target to obtain the real-time pressure and the real-time flow.

[0049] That is to say, after using the ink supply system to spray ink based on the initial pressure and initial flow, the acquired real-time ink droplet data is compared with the ink droplet data corresponding to the spray target, and when the ink droplets do not meet the spray target, the initial flow and pressure are optimized through loop feedback, so that under the inkjet control of the new real-time pressure and real-time flow, the new ink droplets continue to approach the ink droplet state under the spray target.

[0050] The control parameters (flow rate and pressure) of the ink droplet ejection by the nozzle are dynamically changing. At a certain moment, the corresponding real-time target parameters are used for fusion control. After the fusion control is completed, if the ink droplet status does not meet the standard, the real-time target parameters are further adjusted, and a new round of fusion control is performed with the latest target parameters until the ejection target is met.

[0051] In the case where there are differences in the target parameters corresponding to the injection target, the digital twin model (physical modeling simulation model, MAP diagram obtained by actual measurement, empirical formula, etc.) can be used to compare the state parameters and optimize the control parameters such as flow and pressure. After obtaining the optimized target control parameters such as target flow and pressure values, they are automatically fed back to the ink supply system, and the control parameters are adjusted using the multi-sensor fusion control intelligent algorithm to iterate and optimize to ensure the uniformity of ink droplets and inkjet effect.

[0052] In a feasible implementation, the initial pressure or the real-time pressure is used as the adjustment target of the air pressure chamber; the liquid level difference calculated by the initial pressure and the initial flow or the liquid level difference calculated by the real-time pressure and the real-time flow is used as the adjustment target of the adjustable speed pump.

[0053] In air control, the input initial pressure or the adjusted real-time pressure can be used as the adjustment target of the air pressure chamber, and the adjustment target is the target pressure value referenced by e2(t); in pump control, the liquid level difference calculated by the input initial pressure and initial flow, or the liquid level difference calculated by the adjusted real-time pressure and real-time flow, can be used as the adjustment target of the adjustable speed pump, and the adjustment target is the target liquid level difference referenced by e(t).

[0054] In another feasible implementation manner, after step S20, the following steps are further included: Predicting the status of the sprinkler head based on sprinkler head historical data on the status of the sprinkler head; The initial pressure and initial flow are optimized based on the injection target and the predicted nozzle state to obtain the real-time pressure and real-time flow.

[0055] When the real-time ink droplet shape corresponding to the real-time ink droplet data does not meet the injection target, the initial pressure and flow rate or the new real-time pressure and flow rate are optimized, the nozzle state such as the fatigue life of the nozzle can be considered to further optimize the functional parameters that change over time. In this way, the time required for optimization can be shortened.

[0056] The nozzle status is predicted through the nozzle historical data and machine learning algorithm related to the nozzle status, and the ink supply parameters are adjusted in advance. Among them, the nozzle historical data refers to the data related to the nozzle status such as nozzle usage data and nozzle physical data. The nozzle status includes nozzle blockage, wear and other states. After the nozzle is used for a long time, the performance of the nozzle will be damaged. If you want to spray ink droplets in an ideal state, you need to adjust the ink supply parameters. In other words, as the usage time increases, the ink supply parameters are automatically adjusted according to the nozzle usage record. In one embodiment, the ink supply parameters are adjusted according to the predicted nozzle status: if the nozzle is severely worn, the nozzle pressure and flow rate are reduced.

[0057] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the inkjet control method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0058] Furthermore, the ink supply system provided in the present application also includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the inkjet control method in the above-mentioned embodiment one.

[0059] Reference below Figure 6 , which shows a schematic diagram of the structure of an ink supply system suitable for implementing the embodiment of the present application. The ink supply system in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The ink supply system shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0060] like Figure 6As shown, the ink supply system may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory 1002 or a program loaded from a storage device 1003 to a random access memory 1004. In the random access memory 1004, various programs and data required for the operation of the ink supply system are also stored. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are connected to each other through a bus 1005. An input / output interface 1006 is also connected to the bus. Generally, the following systems can be connected to the input / output interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the ink supply system to communicate with other devices wirelessly or wired to exchange data. Although the ink supply system with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0061] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0062] The ink supply system provided by the present application adopts the inkjet control method in the above embodiment, which can solve the technical problems that the stability and uniformity of multi-nozzle large-size inkjet printing are poor and the ejected ink droplets are in a non-ideal state. Compared with the prior art, the beneficial effects of the ink supply system provided by the present application are the same as the beneficial effects of the inkjet control method provided by the above embodiment, and the other technical features of the ink supply system are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0063] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0065] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the inkjet control method in the above-mentioned embodiment.

[0066] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0067] The computer-readable storage medium may be included in the ink supply system; or may exist independently without being assembled into the ink supply system.

[0068] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the ink supply system, the ink supply system: determines the pending pump speed adjustment amount of the adjustable speed pump based on the liquid level between the circulating ink bottle and the ink supply bottle; determines the pending adjustment degree of the intelligent valve based on the ink flow rate of the branched ink path at each level of the layered multi-level ink path; determines the pending pressurization value of the air pressure chamber based on the inlet pressure of the nozzle; and determines the target pump speed adjustment amount corresponding to the pending pump speed adjustment amount, the target adjustment degree corresponding to the pending adjustment degree, and the target pressurization value corresponding to the pending pressurization value through the integrated control of the adjustable speed pump, the intelligent valve and the air pressure chamber.

[0069] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0070] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0071] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0072] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned inkjet control method, and can solve the technical problems that the stability and uniformity of multi-nozzle large-size inkjet printing are poor, and the ejected ink droplets are in a non-ideal state. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the inkjet control method provided in the above-mentioned embodiment, and will not be repeated here.

[0073] The present application also provides a computer program product, including a computer program, which implements the steps of the inkjet control method as described above when executed by a processor.

[0074] The computer program product provided by the present application can solve the technical problem that the stability and uniformity of multi-nozzle large-size inkjet printing are poor, and the ejected ink droplets are in a non-ideal state. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the inkjet control method provided by the above embodiment, and will not be repeated here.

[0075] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An inkjet control method, characterized in that: The inkjet control method is applied to an ink supply system, wherein a circulating ink supply path of the ink supply system includes an ink supply bottle, a layered multi-level ink path, a nozzle, a circulating ink bottle, an adjustable speed pump, and an ink supply bottle, wherein the layered multi-level ink path is divided into two or more ink paths at each level, and a one-to-two or one-to-more intelligent valve is provided at the bifurcation of the ink path, and an air pressure chamber is provided at the nozzle inlet of the last level of the ink path; the inkjet control method includes: Determining a pending pump speed adjustment amount of the adjustable speed pump based on a liquid level between the circulating ink bottle and the ink supply bottle; Determining the pending adjustment degree of the intelligent valve based on the ink path flow of the bifurcated ink paths at each level of the layered multi-level ink paths; Determining a pending pressurization value of the air pressure chamber based on an inlet pressure of the nozzle; By integrating and controlling the adjustable speed pump, the intelligent valve and the air pressure chamber, the target pump speed adjustment amount corresponding to the to-be-determined pump speed adjustment amount, the target adjustment degree corresponding to the to-be-determined adjustment degree and the target pressurization value corresponding to the to-be-determined pressurization value are determined.

2. The inkjet control method according to claim 1, characterized in that: The step of determining the target pump speed adjustment amount corresponding to the pending pump speed adjustment amount by integrating and controlling the adjustable speed pump, the intelligent valve and the air pressure chamber comprises: Determine a first control weight corresponding to the liquid level based on the liquid level, the ink path flow rate, the inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the smart valve, and the air pressure chamber; Based on the first control weight corresponding to the liquid level, the to-be-determined pump speed adjustment amount, the to-be-determined pressurization value and the integral compensation parameter of the air pressure control on the pump speed control, the target pump speed adjustment amount corresponding to the to-be-determined pump speed adjustment amount is determined.

3. The inkjet control method according to claim 1, characterized in that: The step of determining the target adjustment degree corresponding to the undetermined adjustment degree by integrating and controlling the adjustable speed pump, the intelligent valve and the air pressure chamber comprises: Determine a second control weight corresponding to the ink path flow rate based on the liquid level, the ink path flow rate and the inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the smart valve and the air pressure chamber respectively; Based on the second control weight corresponding to the ink path flow, the to-be-determined adjustment degree, the to-be-determined pump speed adjustment amount, and the differential feedforward parameter of pump speed control on valve control, a target adjustment degree corresponding to the to-be-determined adjustment degree is determined.

4. The inkjet control method according to claim 1, characterized in that: The step of determining the target pressurization value corresponding to the undetermined pressurization value by integrating and controlling the adjustable speed pump, the intelligent valve and the air pressure chamber comprises: Determine a third control weight corresponding to the inlet pressure based on the liquid level, the ink path flow rate and the inlet pressure, and preset weight attenuation factors corresponding to the adjustable speed pump, the smart valve and the air pressure chamber respectively; Based on the third control weight corresponding to the inlet pressure, the to-be-determined pressurization value, the to-be-determined adjustment degree and the proportional coupling parameter of valve control to air pressure control, a target pressurization value corresponding to the to-be-determined pressurization value is determined.

5. The inkjet control method according to claim 1, wherein: The inkjet control method further comprises: Acquiring an initial pressure and an initial flow rate set based on an ejection target, wherein the ejection target is that the shape of ink droplets ejected from the nozzle is in an expected ideal shape; Based on the initial pressure and the initial flow rate, using an ink supply system to eject ink and obtain real-time ink droplet data of the ink droplets; When the real-time ink droplet shape corresponding to the real-time ink droplet data does not meet the injection target, optimizing the initial pressure and the initial flow rate based on the injection target to obtain the real-time pressure and the real-time flow rate; Based on the real-time pressure and the real-time flow rate, an ink supply system is used to eject ink until a real-time ink droplet shape corresponding to new real-time ink droplet data meets the ejection target.

6. The inkjet control method according to claim 5, characterized in that: The initial pressure or the real-time pressure is used as the adjustment target of the air pressure chamber; the liquid level difference calculated by the initial pressure and the initial flow or the liquid level difference calculated by the real-time pressure and the real-time flow is used as the adjustment target of the adjustable speed pump.

7. The inkjet control method according to claim 5, characterized in that: After the step of using the ink supply system to jet ink and obtain real-time ink drop data of ink droplets based on the initial pressure and the initial flow rate, the following step is further followed: Predicting the status of the sprinkler head based on sprinkler head historical data on the status of the sprinkler head; The initial pressure and the initial flow are optimized based on the injection target and the predicted nozzle state to obtain the real-time pressure and the real-time flow.

8. An ink supply system, characterized in that: The circulating ink supply path of the ink supply system includes an ink supply bottle, a layered multi-level ink path, a nozzle, a circulating ink bottle, an adjustable speed pump, and an ink supply bottle, which are passed through in sequence, wherein the layered multi-level ink path is divided into two or more ink paths at each level, and a one-to-two or one-to-more intelligent valve is provided at the bifurcation of the ink path, and an air pressure chamber is provided at the nozzle inlet of the last level of the ink path; the ink supply system also includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the inkjet control method as described in any one of claims 1 to 7.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the inkjet control method according to any one of claims 1 to 7 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the inkjet control method according to any one of claims 1 to 7 are implemented.

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