Ink jet amount control system for ink jet printing equipment

Abstract

The invention discloses an ink-jet amount control system for ink-jet printing equipment. The ink-jet amount control system comprises a measurement sensing module, a model construction module, a simulation module and a regulation and control module, the measurement sensing module is used for measuring initialization information of the ink-jet printing equipment, and the model building module is used for building an equivalent circuit model of the ink-jet printing equipment by adopting an impedance analogy method according to the thought of a lumped parameter method; the simulation module is used for building a debugging environment of the main control chip and testing the ink jet condition by applying different voltages according to the main control chip to obtain a simulated ink jet result; and the regulation and control module is used for regulating and controlling the ink-jet amount of the ink-jet printing equipment according to the coffee ring forming degree. According to the invention, the ink-jet effect of the ink-jet printing equipment is meticulously simulated through the simulation model, and the additional control chip is additionally arranged to randomly change the conditions of the ink-jet printing equipment at any time, so that the coffee ring effect is obviously improved, and the ink-jet effect brought by the ink-jet amount under the optimal condition is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet control, and in particular to an inkjet quantity control system for an inkjet printing device. Background Art

[0002] Inkjet printing technology is widely used in various printing equipment, including text printing, image printing and industrial applications. The control of inkjet volume has a vital impact on printing quality and efficiency. Therefore, it is very necessary to develop an efficient inkjet volume control system. The inkjet volume determines how the ink is deposited on the print medium during the printing process. Too much ink will cause blurring and dryness, while too little ink may cause incomplete images or insufficient color saturation. Effective inkjet volume control can significantly improve the clarity and consistency of printing.

[0003] At present, a Chinese invention patent with application number CN202110430535.2 discloses a fully automatic anti-blocking inkjet printing system and method, and proposes a fully automatic anti-blocking inkjet printing system, which can automatically turn on the anti-blocking mode when the printer is stopped for a long time, and automatically recover the ink in the ink head flow channel and the delivery pipe to the ink storage device for reuse, thereby solving the problem of clogging the nozzle after the ink dries. At the same time, after the printer receives the operation instruction, it can quickly enter the ready-to-print state, and the ink enters the ink head flow channel to wet the nozzle and is in a full but not leaking state. There is no need to flush the nozzle with a large amount of ink before each printing, which greatly saves ink consumption, and the system durability and stability are extremely high; however, the existing technology cannot simulate the inkjet effect of the inkjet printing device in detail through a simulation model, and cannot set an additional control chip to change the conditions of the inkjet printing device at any time, cannot significantly improve the coffee ring effect, and cannot obtain the inkjet effect brought by the inkjet amount under the optimal conditions. Summary of the invention

[0004] The technical problem solved by the present invention is that the prior art cannot simulate the inkjet effect of the inkjet printing device in detail through a simulation model, cannot set up an additional control chip to change the conditions of the inkjet printing device at any time, cannot significantly improve the coffee ring effect, and cannot obtain the inkjet effect brought about by the inkjet amount under the optimal conditions.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an inkjet volume control system for an inkjet printing device, comprising a measurement sensing module, a model building module, a simulation module and a control module;

[0006] The measuring sensing module is used to measure the initialization information of the inkjet printing device, the voltage waveform of the ink jet pulse and the influencing parameters affecting the ink flow speed in the inkjet printing device;

[0007] The model building module is used to build an equivalent circuit model of the inkjet printing device using an impedance analogy method based on the idea of ​​a lumped parameter method;

[0008] The simulation module builds a main control chip debugging environment based on the equivalent circuit model, and tests the inkjet condition by applying different voltages according to the main control chip to obtain a simulated inkjet result;

[0009] The control module is used to display the ink jetting amount of the inkjet printing device, and the input measurement sensing module measures the surface tension of the ink printed by the inkjet and the degree of coffee ring formation, and controls the ink jetting amount of the inkjet printing device according to the degree of coffee ring formation.

[0010] Preferably, the measurement sensing module comprises an initial measurement unit and a cyclic measurement unit:

[0011] The initial measurement unit comprises:

[0012] The initialization information includes the velocity at the nozzle, the pressure in the pressure chamber, the inkjet head structure, the flow characteristics of the ink, the mechanical behavior of the piezoelectric material of the inkjet printing device and the ejection characteristics of the nozzle;

[0013] The inkjet head structure includes a nozzle, piezoelectric ceramics and an ink chamber, the flow characteristics include viscosity, surface tension, fluidity, compressibility and temperature dependence, the mechanical behavior includes capacitance characteristics, resistance characteristics and inductance characteristics, the jet characteristics include jet mode, nozzle diameter, jet speed and jet angle, the voltage waveform of the ink jet pulse includes that in the pressure chamber and at the nozzle hole, and the influencing parameters that affect the flow speed of the ink in the inkjet printing device include boiling point, density, concentration and viscosity;

[0014] The boiling point unit is °C, the density unit is g / mL or g / cm3, the concentration unit is mol / L or g / mL, and the viscosity unit is Pa·s or cP;

[0015] The physical properties of the capacitance characteristic, resistance characteristic and inductance characteristic include:

[0016] The capacitance characteristic represents the ability of the piezoelectric material to store charge under the action of an electric field;

[0017] The resistance characteristic represents the flow resistance of the ink in the nozzle and the ink chamber;

[0018] The inductance characteristic represents the inertia characteristic of the ink flow.

[0019] Preferably, the cycle measurement unit comprises:

[0020] The surface tension of the ejected ink is measured using the maximum bubble method, where the surface tension unit is mN / m;

[0021] The image processing software is used to analyze the aggregation of solid particles at the edge of the ink droplet during the evaporation of the ink, and the formation of the coffee ring is quantified. The formation is quantitatively analyzed through the peak of the mass spectrum of light scattering, and the degree of formation of the coffee ring is graded, including:

[0022] Use a high-resolution camera to capture images of ink droplets during the evaporation process to ensure that the evolution of the ink droplets is recorded at different time points. Use the image processing software OpenCV to identify and track the location and distribution of solid particles in the collected images. Through image segmentation and edge detection technology, obtain the aggregation of solid particles at the edge of the ink droplet, quantitatively analyze the aggregation characteristics of the ink droplet edge, including the number of solid particles, distribution density and edge width, and identify the rough coffee ring structure based on the characteristics of the coffee ring.

[0023] A mass spectrum of the ink droplet during evaporation is obtained through a light scattering experiment. The size distribution of solid particles at different time points is obtained according to the identified rough coffee ring structure and the peak of the mass spectrum. The peak of the mass spectrum respectively represents the aggregation degree and size distribution of the solid particles at each time point. The rough coffee ring structure is compared to remove erroneous data, and the peak of the mass spectrum without erroneous data is extracted as a quantitative feature. The quantitative feature values ​​respectively represent different coffee ring formation degrees. According to the characteristics of the coffee ring and the quantitative features, the coffee ring formation degree is graded, including:

[0024] The first level means no coffee rings;

[0025] The second level indicates a slight coffee ring;

[0026] The third level indicates a noticeable coffee ring;

[0027] The fourth level indicates a strong coffee ring.

[0028] Preferably, the model building module includes a flow calculation unit and a parameter model building unit;

[0029] The flow calculation unit is used to calculate flow parameters using the influencing parameters affecting the ink flow velocity obtained by the measurement sensing module, and the flow parameters include Reynolds number and Weber number;

[0030] The Reynolds number is a dimensionless number affected by viscosity, denoted by Re, and its mathematical expression is:

[0031]

[0032] Where a represents the nozzle diameter, v represents the flow rate, ρ represents the density, and σ represents the viscosity;

[0033] The Weber number is a dimensionless number representing the ratio of the inertial force to the surface tension effect, denoted as We, and its mathematical expression is:

[0034] Here, γ represents the surface tension.

[0035] Preferably, the parameter model building unit comprises:

[0036] According to the physical properties of the capacitance characteristic, the resistance characteristic and the inductance characteristic, the mechanical behavior of the piezoelectric material of the inkjet printing device is converted into an electrical equivalent circuit element, and the electrical equivalent circuit elements are combined to construct an equivalent circuit model, and the combination method includes:

[0037] Connect the power supply and capacitor in series;

[0038] Connect resistors in parallel or in series with the fluid path;

[0039] The input and output of the equivalent circuit model include:

[0040] The input is the voltage applied to the piezoelectric material, and the output is the flow rate at the nozzle or the amount of ink droplets ejected;

[0041] A state space equation is formed based on the equivalent circuit model, and the mathematical expression of the state space equation is:

[0042]

[0043] y=Cx+Du

[0044] Where x represents the state vector, represents the derivative of the state vector with respect to time, the state vector includes the electric field of the equivalent circuit model and the fluid pressure therein, u represents input, y represents output, and A, B, C and D represent constant vectors.

[0045] Preferably, the simulation module includes an environment building unit and a test unit:

[0046] The construction environment unit includes:

[0047] The simulation model initialized by arranging the simulation software is used, and the asynchronous FIFO is used as a cache device for small batch data of the simulation model, and the cache device is a buffer of the simulation model. The main control chip is set as the core control part, and the initialization information, Reynolds number, Weber number, input interface of the equivalent circuit model and output interface of the equivalent circuit model are respectively set as pin control parameters of the main control chip. The main control chip is debugged, including:

[0048] A changing voltage is input to the main control chip, and the initialization information and all the data output by the cyclic measurement unit are cached in a buffer. All the data cached in the buffer are normalized into a single-dimensional characteristic value, and the single-dimensional characteristic value is input into the simulation model. A drive control signal is generated after passing through the equivalent circuit model, and the drive control signal is transmitted to the interface circuit of the nozzle. Under the amplification effect of the power amplifier, the drive control signal is rushed to the nozzle interface according to the timing required for the nozzle drive control, so as to control the nozzle to perform the printing task.

[0049] Preferably, the testing unit comprises:

[0050] Monitor the stable state of the output value of the main control chip and each pin control parameter, apply a changing voltage to the main control chip, observe the inkjet situation through the changing voltage, and record the inkjet effect of the inkjet printing device under the condition of the change of the pin control parameters of the main control chip, the inkjet effect includes the stability, accuracy and coverage of the inkjet, and the pin control parameters of the main control chip are in the optimal inkjet state when the maximum value of the weighted average sum of the stability, accuracy and coverage values ​​is selected.

[0051] Preferably, the control module includes:

[0052] The step of regulating the inkjet amount of the inkjet printing device according to the degree of formation of the coffee ring comprises:

[0053] The properties of the ink and the environmental conditions are adjusted to observe the degree of coffee ring formation, the corresponding properties of the ink and the environmental conditions are recorded in the order of the first level, the second level, the third level and the fourth level, and the levels of coffee ring formation corresponding to the properties of the ink and the environmental conditions are statistically stored in a database.

[0054] An electronic device comprises a storage device, a processor and a computer program stored in the storage device and executable on the processor, wherein the processor implements an inkjet volume control system for an inkjet printing device when executing the computer program.

[0055] A computer-readable storage medium is characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, an inkjet volume control system for an inkjet printing device is implemented.

[0056] The beneficial effects of the present invention are as follows: the inkjet effect of the inkjet printing device is carefully simulated by the simulation model, and an additional control chip is provided to change the conditions of the inkjet printing device at any time, thereby significantly improving the coffee ring effect and obtaining the inkjet effect brought about by the inkjet amount under the optimal conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A basic flow chart of an ink jetting volume control system for an ink jet printing device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0059] Reference Figure 1 , as one embodiment of the present invention, provides an inkjet volume control system for an inkjet printing device, including a measurement sensing module, a model building module, a simulation module and a control module;

[0060] The measuring sensing module is used to measure the initialization information of the inkjet printing device, the voltage waveform of the ink jet pulse and the influencing parameters affecting the ink flow speed in the inkjet printing device;

[0061] The model building module is used to build an equivalent circuit model of the inkjet printing device using an impedance analogy method based on the idea of ​​a lumped parameter method;

[0062] The simulation module builds a main control chip debugging environment based on the equivalent circuit model, and tests the inkjet condition by applying different voltages according to the main control chip to obtain a simulated inkjet result;

[0063] The control module is used to display the ink jetting amount of the inkjet printing device, and the input measurement sensing module measures the surface tension of the ink printed by the inkjet and the degree of coffee ring formation, and controls the ink jetting amount of the inkjet printing device according to the degree of coffee ring formation.

[0064] The present invention simulates the inkjet effect of the inkjet printing device in detail through a simulation model, and further provides an additional control chip to change the conditions of the inkjet printing device at any time, regulate the inkjet amount of the inkjet printing device, and obtain the inkjet effect brought by the inkjet amount under the optimal conditions.

[0065] The measurement sensing module includes an initial measurement unit and a cyclic measurement unit:

[0066] The initial measurement unit comprises:

[0067] The initialization information includes the velocity at the nozzle, the pressure in the pressure chamber, the inkjet head structure, the flow characteristics of the ink, the mechanical behavior of the piezoelectric material of the inkjet printing device and the ejection characteristics of the nozzle;

[0068] The inkjet head structure includes a nozzle, piezoelectric ceramics and an ink chamber, the flow characteristics include viscosity, surface tension, fluidity, compressibility and temperature dependence, the mechanical behavior includes capacitance characteristics, resistance characteristics and inductance characteristics, the jet characteristics include jet mode, nozzle diameter, jet speed and jet angle, the voltage waveform of the ink jet pulse includes that in the pressure chamber and at the nozzle hole, and the influencing parameters that affect the flow speed of the ink in the inkjet printing device include boiling point, density, concentration and viscosity;

[0069] The boiling point unit is °C, the density unit is g / mL or g / cm3, the concentration unit is mol / L or g / mL, and the viscosity unit is Pa·s or cP;

[0070] The jetting modes include thermal jetting, piezoelectric jetting and electrostatic jetting, which affect the formation mode and jetting efficiency of ink droplets;

[0071] The nozzle diameter directly affects the size of the ink droplets. Smaller nozzles can generate smaller ink droplets, which is suitable for high-precision printing, while larger nozzles are suitable for fast printing.

[0072] The jetting speed refers to the speed at which ink droplets are ejected from the nozzle. An appropriate jetting speed can ensure that the ink droplets accurately reach the target surface and avoid the scattering or aggregation of the ink droplets.

[0073] The spray angle affects the trajectory of the ink droplets flying toward the target. According to different application requirements, the nozzle can be designed with different spray angles to ensure accurate positioning of the ink droplets.

[0074] The physical properties of the capacitance characteristic, resistance characteristic and inductance characteristic include:

[0075] The capacitance characteristic represents the ability of the piezoelectric material to store charge under the action of an electric field;

[0076] The resistance characteristic represents the flow resistance of the ink in the nozzle and the ink chamber, simulating the viscous resistance and friction loss of the fluid;

[0077] The inductance characteristic represents the inertial characteristic of the ink flow, especially during the acceleration or deceleration of the ink.

[0078] Characteristics of coffee rings include:

[0079] A coffee ring usually appears as a ring-shaped structure formed by solid particles gathered at the edge of an ink droplet. When the ink droplet evaporates, the particles in the liquid will move to the edge due to the capillary effect, thus forming a distinct ring. There are few particles in the center of the coffee ring, while more solid particles are gathered at the edge. This difference in particle concentration is the key feature of the formation of the coffee ring. Under certain conditions, the formed coffee ring exhibits a clear outline. The particle distribution at the edge is usually significantly higher than that in the center of the ink droplet, making the outline of the coffee ring clearly visible. The coffee ring presents a relatively symmetrical circular structure. The shape of the ink droplet, surface tension, and bottom surface characteristics can lead to irregular or eccentric coffee rings. Due to the aggregation of particles and the scattering of light, the color of the coffee ring will be different from the surrounding coffee environment, and it may exhibit different reflection and refraction characteristics under light.

[0080] The cycle measurement unit comprises:

[0081] The surface tension of the ejected ink is measured using the maximum bubble method, where the surface tension unit is mN / m;

[0082] The image processing software is used to analyze the aggregation of solid particles at the edge of the ink droplet during the evaporation of the ink, and the formation of the coffee ring is quantified. The formation is quantitatively analyzed through the peak of the mass spectrum of light scattering, and the degree of formation of the coffee ring is graded, including:

[0083] Use a high-resolution camera to capture images of ink droplets during the evaporation process to ensure that the evolution of the ink droplets is recorded at different time points. Use the image processing software OpenCV to identify and track the location and distribution of solid particles in the collected images. Through image segmentation and edge detection technology, obtain the aggregation of solid particles at the edge of the ink droplet, quantitatively analyze the aggregation characteristics of the ink droplet edge, including the number of solid particles, distribution density and edge width, and identify the rough coffee ring structure based on the characteristics of the coffee ring.

[0084] A mass spectrum of the ink droplet during evaporation is obtained through a light scattering experiment. The size distribution of solid particles at different time points is obtained according to the identified rough coffee ring structure and the peak of the mass spectrum. The peak of the mass spectrum respectively represents the aggregation degree and size distribution of the solid particles at each time point. The rough coffee ring structure is compared to remove erroneous data, and the peak of the mass spectrum without erroneous data is extracted as a quantitative feature. The quantitative feature values ​​respectively represent different coffee ring formation degrees. According to the characteristics of the coffee ring and the quantitative features, the coffee ring formation degree is graded, including:

[0085] The first level is that there is almost no particle aggregation, and the ink droplets evaporate evenly, indicating that there is no coffee ring;

[0086] The second level is that a small amount of particles gather at the edge of the ink droplet, forming an incomplete coffee ring structure, indicating a slight coffee ring;

[0087] The third level is that the particles gathered at the edge are obvious and the coffee ring is completely formed, indicating an obvious coffee ring;

[0088] The fourth level is that the particles aggregate on a large scale to form a clear coffee ring structure, indicating a strong coffee ring.

[0089] The model building module includes a flow calculation unit and a parameter model building unit;

[0090] The flow calculation unit is used to calculate flow parameters using the influencing parameters affecting the ink flow velocity obtained by the measurement sensing module, and the flow parameters include Reynolds number and Weber number;

[0091] The Reynolds number is a dimensionless number affected by viscosity, denoted by Re, and its mathematical expression is:

[0092]

[0093] Where a represents the nozzle diameter, v represents the flow rate, ρ represents the density, and σ represents the viscosity;

[0094] The Weber number is a dimensionless number representing the ratio of the inertial force to the surface tension effect, denoted as We, and its mathematical expression is:

[0095] Here, γ represents the surface tension.

[0096] The parameter model building unit comprises:

[0097] According to the physical properties of the capacitance characteristic, the resistance characteristic and the inductance characteristic, the mechanical behavior of the piezoelectric material of the inkjet printing device is converted into an electrical equivalent circuit element, and the electrical equivalent circuit elements are combined to construct an equivalent circuit model, and the combination method includes:

[0098] Connect a power source in series with a capacitor to reflect the voltage applied to the piezoelectric material;

[0099] Connect resistors in parallel or series in the fluid path to represent different flow resistances;

[0100] Adding inductance according to the requirements of the fluid dynamics of the equivalent circuit model;

[0101] The input and output of the equivalent circuit model include:

[0102] The input is the voltage applied to the piezoelectric material, and the output is the flow rate at the nozzle or the amount of ink droplets ejected;

[0103] A state space equation is formed based on the equivalent circuit model, and the mathematical expression of the state space equation is:

[0104]

[0105] y=Cx+Du

[0106] Where x represents the state vector, represents the derivative of the state vector with respect to time, the state vector includes the electric field of the equivalent circuit model and the fluid pressure therein, u represents input, y represents output, and A, B, C and D represent constant vectors.

[0107] According to claim 5, the impedance analogy method can be used to effectively establish an equivalent circuit model of the inkjet printing device, thereby providing a basis for subsequent control design and performance optimization.

[0108] The simulation module includes an environment building unit and a test unit:

[0109] The construction environment unit includes:

[0110] The initialized simulation model is arranged by using simulation software, and the asynchronous FIFO is used as a cache device for small batch data of the simulation model to meet the conditions of high-frequency printing. The cache device is a buffer of the simulation model to ensure the stability and timeliness of the data flow. The main control chip is set as the core control part, and the initialization information, Reynolds number, Weber number, input interface of the equivalent circuit model and output interface of the equivalent circuit model are respectively set as pin control parameters of the main control chip. Debugging the main control chip includes:

[0111] A changing voltage is input to the main control chip, and the initialization information and all the data output by the cyclic measurement unit are cached in a buffer. All the data cached in the buffer are normalized into a single-dimensional characteristic value, and the single-dimensional characteristic value is input into the simulation model. A drive control signal is generated after passing through the equivalent circuit model, and the drive control signal is transmitted to the interface circuit of the nozzle. Under the amplification effect of the power amplifier, the drive control signal is rushed to the nozzle interface according to the timing required for the nozzle drive control, so as to control the nozzle to perform the printing task.

[0112] In order to prevent the output drive pulse from being unable to carry too much load, a power amplifier is used to amplify the drive pulse. However, in the actual circuit, the power amplifier module should not be placed together with the drive board circuit to avoid interference that affects the stability of the entire system.

[0113] The test unit comprises:

[0114] Monitor the stable state of the output value of the main control chip and each pin control parameter, apply a changing voltage to the main control chip, observe the inkjet situation through the changing voltage, and record the inkjet effect of the inkjet printing device under the condition of the change of the pin control parameters of the main control chip, the inkjet effect includes the stability, accuracy and coverage of the inkjet, and the pin control parameters of the main control chip are in the optimal inkjet state when the maximum value of the weighted average sum of the stability, accuracy and coverage values ​​is selected.

[0115] The control module includes:

[0116] The step of regulating the inkjet amount of the inkjet printing device according to the degree of formation of the coffee ring comprises:

[0117] The properties of the ink and the environmental conditions are adjusted to observe the degree of coffee ring formation, the corresponding ink properties and environmental conditions are recorded in the order of the first level, the second level, the third level and the fourth level, the levels of coffee ring formation corresponding to the ink properties and environmental conditions are statistically analyzed in a database form, and adjusting the inkjet amount can help improve the final printing effect.

[0118] During the evaporation process of droplets, the coffee ring effect may cause uneven distribution of ink during printing, affecting image quality. To address this phenomenon, the inkjet volume control system should be able to monitor and adjust the inkjet volume in real time to reduce the impact of the coffee ring.

[0119] The present invention simulates the inkjet effect of the inkjet printing device in detail through a simulation model. In addition, an additional control chip is provided to change the conditions of the inkjet printing device at any time, and the inkjet amount of the inkjet printing device is regulated, thereby significantly improving the coffee ring effect and obtaining the inkjet effect brought by the inkjet amount under the optimal conditions.

[0120] It should be understood by those skilled in the art that the embodiments of the present invention can be provided as methods, systems or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program codes. Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk. These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0121] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An inkjet volume control system for an inkjet printing device, characterized in that: It includes measurement sensing module, model building module, simulation module and control module; The measuring sensing module is used to measure the initialization information of the inkjet printing device, the voltage waveform of the ink jet pulse and the influencing parameters affecting the ink flow speed in the inkjet printing device; The model building module is used to build an equivalent circuit model of the inkjet printing device using an impedance analogy method based on the idea of ​​a lumped parameter method; The simulation module builds a main control chip debugging environment based on the equivalent circuit model, and tests the inkjet condition by applying different voltages according to the main control chip to obtain a simulated inkjet result; The control module is used to display the ink jetting amount of the inkjet printing device, and the input measurement sensing module measures the surface tension of the ink printed by the inkjet and the degree of coffee ring formation, and controls the ink jetting amount of the inkjet printing device according to the degree of coffee ring formation.

2. The ink jetting amount control system for an inkjet printing device according to claim 1, characterized in that: The measurement sensing module includes an initial measurement unit and a cyclic measurement unit: The initial measurement unit comprises: The initialization information includes the velocity at the nozzle, the pressure in the pressure chamber, the inkjet head structure, the flow characteristics of the ink, the mechanical behavior of the piezoelectric material of the inkjet printing device and the ejection characteristics of the nozzle; The inkjet head structure includes a nozzle, piezoelectric ceramics and an ink chamber, the flow characteristics include viscosity, surface tension, fluidity, compressibility and temperature dependence, the mechanical behavior includes capacitance characteristics, resistance characteristics and inductance characteristics, the jet characteristics include jet mode, nozzle diameter, jet speed and jet angle, the voltage waveform of the ink jet pulse includes that in the pressure chamber and at the nozzle hole, and the influencing parameters that affect the flow speed of the ink in the inkjet printing device include boiling point, density, concentration and viscosity; The boiling point unit is °C, the density unit is g / mL or g / cm3, the concentration unit is mol / L or g / mL, and the viscosity unit is Pa·s or cP; The physical properties of the capacitance characteristic, resistance characteristic and inductance characteristic include: The capacitance characteristic represents the ability of the piezoelectric material to store charge under the action of an electric field; The resistance characteristic represents the flow resistance of the ink in the nozzle and the ink chamber; The inductance characteristic represents the inertia characteristic of the ink flow.

3. The ink jetting amount control system for an ink jet printing device according to claim 2, characterized in that: The cycle measurement unit comprises: The surface tension of the ejected ink is measured using the maximum bubble method, where the surface tension unit is mN / m; The image processing software is used to analyze the aggregation of solid particles at the edge of the ink droplet during the evaporation of the ink, and the formation of the coffee ring is quantified. The formation is quantitatively analyzed through the peak of the mass spectrum of light scattering, and the degree of formation of the coffee ring is graded, including: Use a high-resolution camera to capture images of ink droplets during the evaporation process to ensure that the evolution of the ink droplets is recorded at different time points. Use the image processing software OpenCV to identify and track the location and distribution of solid particles in the collected images. Through image segmentation and edge detection technology, obtain the aggregation of solid particles at the edge of the ink droplet, quantitatively analyze the aggregation characteristics of the ink droplet edge, including the number of solid particles, distribution density and edge width, and identify the rough coffee ring structure based on the characteristics of the coffee ring. A mass spectrum of the ink droplet during evaporation is obtained through a light scattering experiment. The size distribution of solid particles at different time points is obtained according to the identified rough coffee ring structure and the peak of the mass spectrum. The peak of the mass spectrum respectively represents the aggregation degree and size distribution of the solid particles at each time point. The rough coffee ring structure is compared to remove erroneous data, and the peak of the mass spectrum without erroneous data is extracted as a quantitative feature. The quantitative feature values ​​respectively represent different coffee ring formation degrees. According to the characteristics of the coffee ring and the quantitative features, the coffee ring formation degree is graded, including: The first level means no coffee rings; The second level indicates a slight coffee ring; The third level indicates a noticeable coffee ring; The fourth level indicates a strong coffee ring.

4. The ink jetting amount control system for an ink jet printing device according to claim 3, characterized in that: The model building module includes a flow calculation unit and a parameter model building unit; The flow calculation unit is used to calculate flow parameters using the influencing parameters affecting the ink flow velocity obtained by the measurement sensing module, and the flow parameters include Reynolds number and Weber number; The Reynolds number is a dimensionless number affected by viscosity, denoted by Re, and its mathematical expression is: Where a represents the nozzle diameter, v represents the flow rate, ρ represents the density, and σ represents the viscosity; The Weber number is a dimensionless number representing the ratio of the inertial force to the surface tension effect, denoted as We, and its mathematical expression is: Here, γ represents the surface tension.

5. The ink jetting amount control system for an ink jet printing device according to claim 4, characterized in that: The parameter model building unit comprises: According to the physical properties of the capacitance characteristic, the resistance characteristic and the inductance characteristic, the mechanical behavior of the piezoelectric material of the inkjet printing device is converted into an electrical equivalent circuit element, and the electrical equivalent circuit elements are combined to construct an equivalent circuit model, and the combination method includes: Connect the power supply and capacitor in series; Connect resistors in parallel or in series with the fluid path; The input and output of the equivalent circuit model include: The input is the voltage applied to the piezoelectric material, and the output is the flow rate at the nozzle or the amount of ink droplets ejected; A state space equation is formed based on the equivalent circuit model, and the mathematical expression of the state space equation is: y=Cx+Du Where x represents the state vector, represents the derivative of the state vector with respect to time, the state vector includes the electric field of the equivalent circuit model and the fluid pressure therein, u represents input, y represents output, and A, B, C and D represent constant vectors.

6. The ink jetting amount control system for an ink jet printing device according to claim 5, characterized in that: The simulation module includes an environment building unit and a test unit: The construction environment unit includes: The simulation model initialized by arranging the simulation software is used, and the asynchronous FIFO is used as a cache device for small batch data of the simulation model, and the cache device is a buffer of the simulation model. The main control chip is set as the core control part, and the initialization information, Reynolds number, Weber number, input interface of the equivalent circuit model and output interface of the equivalent circuit model are respectively set as pin control parameters of the main control chip. The main control chip is debugged, including: A changing voltage is input to the main control chip, and the initialization information and all the data output by the cyclic measurement unit are cached in a buffer. All the data cached in the buffer are normalized into a single-dimensional characteristic value, and the single-dimensional characteristic value is input into the simulation model. A drive control signal is generated after passing through the equivalent circuit model, and the drive control signal is transmitted to the interface circuit of the nozzle. Under the amplification effect of the power amplifier, the drive control signal is rushed to the nozzle interface according to the timing required for the nozzle drive control, so as to control the nozzle to perform the printing task.

7. The ink jetting amount control system for an ink jet printing device according to claim 6, characterized in that: The test unit comprises: Monitor the stable state of the output value of the main control chip and each pin control parameter, apply a changing voltage to the main control chip, observe the inkjet situation through the changing voltage, and record the inkjet effect of the inkjet printing device under the condition of the change of the pin control parameters of the main control chip, the inkjet effect includes the stability, accuracy and coverage of the inkjet, and the pin control parameters of the main control chip are in the optimal inkjet state when the maximum value of the weighted average sum of the stability, accuracy and coverage values ​​is selected.

8. The ink jetting amount control system for an ink jet printing device according to claim 7, characterized in that: The control module includes: The step of regulating the inkjet amount of the inkjet printing device according to the degree of formation of the coffee ring comprises: The properties of the ink and the environmental conditions are adjusted to observe the degree of coffee ring formation, the corresponding properties of the ink and the environmental conditions are recorded in the order of the first level, the second level, the third level and the fourth level, and the levels of coffee ring formation corresponding to the properties of the ink and the environmental conditions are statistically stored in a database.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, an ink jetting amount control system for an inkjet printing device as described in any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the inkjet volume control system for an inkjet printing device according to any one of claims 1 to 8 is implemented.

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