Intelligent control system of inkjet printer based on Internet of Things

Abstract

This invention relates to the field of inkjet printer control technology, and discloses an intelligent control system for inkjet printers based on the Internet of Things (IoT), including a data acquisition module, a control analysis unit, and a control execution unit. The inkjet printing speed of this invention can be dynamically adjusted. It can extract the product conveying speed on the production line, compare it with a standard value, and then reasonably increase or decrease the inkjet printing speed based on the result. The adjusted speed is determined through a precise formula to adapt it to the production rhythm. The inkjet printing quality can be monitored and adjusted in real time. By establishing a model of the relationship between printhead temperature, ink pressure, and inkjet printing quality, the optimal printhead temperature and optimal ink pressure are scientifically determined. Then, by comparing the current values, the system automatically judges and generates adjustment signals and determines the adjustment value, achieving automatic optimization of printhead temperature and ink pressure. Overall, this system improves the intelligence level of inkjet printer operation, ensures efficient and high-quality inkjet printing, and meets the needs of modern production.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet printer control, and in particular to an intelligent control system for inkjet printers based on the Internet of Things. Background Art

[0002] The inkjet speed of traditional inkjet printers is often a pre-set fixed value, which cannot be flexibly adjusted according to the actual product transmission speed of the production line. In the actual production process, the product transmission speed of the production line may change due to factors such as changes in production plans, restarting after equipment failure repairs, or production requirements of different batches of products. When the product transmission speed increases, if the inkjet printer still runs at the original fixed inkjet speed, it may cause problems such as missing inkjet codes or inaccurate inkjet positions; conversely, when the product transmission speed slows down, it may cause waste of inkjet resources and unstable inkjet quality, such as ink accumulation and unclear inkjet lines.

[0003] In addition, the quality of inkjet printing is significantly affected by the temperature of the nozzle and the pressure of the ink. It is difficult for traditional inkjet printers to accurately monitor and automatically adjust the temperature and pressure of the nozzle in real time during operation. Too high or too low nozzle temperature will affect the ink jetting effect, and thus affect the quality of inkjet printing, for example, it may cause defects such as uneven thickness of the inkjet lines, different shades of color, or breakpoints. Similarly, unstable ink pressure can also cause similar inkjet quality problems. For example, too high pressure may cause excessive ink jetting, and too low pressure may cause insufficient or discontinuous ink jetting. However, traditional inkjet printers lack effective means to establish an accurate relationship model between nozzle temperature, ink pressure and inkjet quality, and cannot optimize the inkjet quality in real time based on changes in these key factors. They usually require regular manual inspections and manual adjustments, which is not only inefficient, but also difficult to ensure the timeliness and accuracy of adjustments, and cannot meet the needs of modern large-scale, high-precision production.

[0004] Based on the above background, there is an urgent need for an intelligent control system that can dynamically adjust the coding speed according to the product conveying speed of the production line, and can monitor the nozzle temperature and ink pressure in real time to ensure the coding quality, so as to improve the adaptability, reliability and efficiency of the inkjet printer in industrial production. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent control system for inkjet printers based on the Internet of Things, which solves the technical problems raised in the background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The intelligent control system of inkjet printer based on the Internet of Things includes:

[0008] The data acquisition module is used to collect various target data during the operation of the inkjet printer, including the real-time nozzle temperature, ink pressure, inkjet speed, and product transmission speed of the production line;

[0009] A control and analysis unit, used to dynamically adjust the inkjet speed parameters according to the product transmission speed data of the production line, and determine the adjusted current inkjet speed through the dynamic adjustment of the inkjet speed;

[0010] It is also used to monitor and adjust the inkjet quality in real time according to the nozzle temperature and ink pressure data; the method is: by establishing a nozzle temperature and inkjet quality relationship model and an ink pressure and inkjet quality relationship model to determine the optimal nozzle temperature and the optimal ink pressure, and then combine the optimal nozzle temperature and the optimal ink pressure with the current nozzle temperature and ink pressure respectively to determine whether to generate a corresponding temperature adjustment signal and a pressure adjustment signal, and determine the temperature adjustment value and the pressure adjustment value according to the generation of the temperature adjustment signal and the pressure adjustment signal;

[0011] The control execution unit is used to adjust the nozzle temperature, ink pressure and coding speed of the inkjet printer during operation according to the adjusted current coding speed, temperature adjustment value and its corresponding temperature adjustment signal, pressure adjustment value and its corresponding pressure adjustment signal obtained by the control analysis unit.

[0012] As a further solution of the present invention: the injection speed dynamic adjustment method is as follows:

[0013] StepA1. Extract the current product delivery speed of the production line and mark it as V product ;

[0014] StepA2, then increase the product transmission speed V product Compared with the preset product transmission speed standard value V standard Compare and adjust the current inkjet speed based on the preset basic inkjet speed according to the comparison result:

[0015] Step A3, then determine the adjusted current inkjet speed based on the product conveying speed, the preset product conveying speed standard value, and the preset basic inkjet speed.

[0016] As a further solution of the present invention: the comparison and adjustment method in Step A2 is as follows:

[0017] When V product >V standard ,Right now When , it means that the product transmission speed is faster than the standard speed, and the current inkjet speed will be increased based on the pre-set basic inkjet speed;

[0018] When V product <V standard ,Right now When the product transmission speed is slower than the standard speed, the current inkjet speed will be reduced based on the preset basic inkjet speed.

[0019] When V product =V standard , it means that the product transmission speed is consistent with the standard speed, and the current coding speed will not be adjusted based on the pre-set basic coding speed.

[0020] As a further solution of the present invention: in Step A3, the corresponding adjustment formula is:

[0021] ;

[0022] Among them, V adjust is the current printing speed after adjustment, V base is the preset basic inkjet speed, and k is the preset speed adjustment coefficient.

[0023] As a further solution of the present invention: the real-time monitoring and adjustment method is as follows:

[0024] The first step is to build a model of the relationship between nozzle temperature and coding quality:

[0025] Step 1.1 Obtain the temperature variation range of the nozzle and record it as [T min , T max ];

[0026] Step 1.2, from the nozzle temperature change range [T min , T max ], n nozzle temperature values ​​are selected at fixed time intervals and marked as T i , i=1, 2, ... n;

[0027] Step 1.3, adjust the nozzle temperature to each selected nozzle temperature value Ti, and then perform m coding experiments, and then obtain the coding quality score value obtained in each experiment, and record it as PT ij , where j = 1, 2, ..., m;

[0028] Step 1.4, through:

[0029] ;

[0030] Calculate different nozzle temperature values ​​T i The corresponding average value of the coding quality score Q Ti ;

[0031] Among them, when i=1, then Q Ti It is expressed as the average value of the coding quality score corresponding to a nozzle temperature value;

[0032] Step 1.5, use the polynomial fitting method to establish the relationship between the nozzle temperature and the average value of the coding quality index;

[0033] The fitting polynomial is: ;

[0034] In the formula, k is the degree of the polynomial;

[0035] In the formula, a0, a1, a2, ... a k The coefficients of the corresponding polynomial when establishing the relationship between the nozzle temperature and the average value of the coding quality index;

[0036] Step 1.6, use the least squares method to determine the coefficient value of the polynomial;

[0037] Among them, the goal of the least squares method is to minimize the sum of squared errors;

[0038] Right now: ;

[0039] Then, the relationship model between the nozzle temperature and the coding quality score is determined based on the coefficient value of the polynomial;

[0040] Its relational model is expressed as:

[0041] ;

[0042] Step 2: Constructing the relationship model between ink pressure and coding quality:

[0043] The relationship model between ink pressure and inkjet quality is established in accordance with the establishment method of the relationship model between nozzle temperature and inkjet quality;

[0044] Its relationship model is through: express;

[0045] In the formula, b0, b1, b2, ... b k The coefficients of the corresponding polynomial when establishing the relationship model between ink pressure and coding quality;

[0046] Step 3: Determine the optimal nozzle temperature based on the nozzle temperature model:

[0047] Extract the pre-set coding quality standard score value and mark it as Q target ;

[0048] Then, it is substituted into the relationship model between nozzle temperature and coding quality, and the optimal nozzle temperature corresponding to the coding quality standard score is obtained;

[0049] Among them, the equation corresponding to the optimal nozzle temperature and the coding quality standard score in the relationship model is as follows:

[0050] ;

[0051] Where, T adjust is the optimal nozzle temperature;

[0052] By solving the equation corresponding to the optimal nozzle temperature and the coding quality standard score, the optimal nozzle temperature corresponding to the coding quality standard score is obtained;

[0053] Step 4: Compare the current nozzle temperature with the optimal value and calculate the adjustment value:

[0054] Get the current nozzle temperature and mark it as T1;

[0055] Then the current nozzle temperature T1 is compared with the optimal nozzle temperature T adjust Compare and calculate the nozzle temperature T1 and the optimal nozzle temperature T adjust The absolute value of the difference between them is used as the temperature adjustment value;

[0056] Step 5: Determine the optimal ink pressure based on the ink pressure model:

[0057] Extract the pre-set coding quality standard score value and mark it as Q target ;

[0058] Then, it is substituted into the relationship model between ink pressure and coding quality, and the optimal ink pressure corresponding to the coding quality standard score is obtained;

[0059] Among them, the equation corresponding to the optimal ink pressure and the coding quality standard score in the relationship model is as follows:

[0060] ;

[0061] Where P adjust is the optimal ink pressure;

[0062] By solving the equation corresponding to the optimal ink pressure and the coding quality standard score, the optimal ink pressure corresponding to the coding quality standard score is obtained;

[0063] Step 6. Compare the current ink pressure with the optimal value and calculate the adjustment value:

[0064] Get the current ink pressure and mark it as P1;

[0065] Then the current ink pressure P1 is compared with the optimal ink pressure P adjust Compare and calculate the ink pressure P1 and the optimal ink pressure Padjust The absolute value of the difference between them is used as the pressure adjustment value.

[0066] As a further solution of the present invention: wherein, the coding quality score value is determined by the coding line deviation rate.

[0067] As a further solution of the present invention: the deviation value of the coding line is obtained as follows:

[0068] Step 1.3.1, obtain the preset required width of the coding line and record it as Wy;

[0069] At the same time, the actual width of the coding line is measured by a high-precision measuring tool and recorded as Ws;

[0070] Step1.3.2, through:

[0071] ;

[0072] Calculate the coding quality score PT;

[0073] In the formula, It is the deviation rate of the coding line between the required coding line width and the actual coding line width.

[0074] As a further solution of the present invention: in the fourth step, when T1<T adjust -β T When , it indicates that the current nozzle temperature is low, and a temperature increase signal is generated. The temperature increase signal is used to combine the temperature adjustment value, and the control module adjusts the heating device disposed on the nozzle to restore the nozzle temperature to the optimal nozzle temperature;

[0075] When T1>T adjust +β T When , it indicates that the current nozzle temperature is high, and a temperature adjustment signal is generated. The temperature adjustment signal is used to combine the temperature adjustment value, and the control module adjusts the cooling device set on the nozzle to restore the nozzle temperature to the optimal nozzle temperature;

[0076] When T adjust -β T ≤T1≤T adjust +β T , it means that the current nozzle temperature is moderate and no corresponding temperature adjustment signal is generated;

[0077] In the formula, β T It is a supplementary factor preset according to the nozzle temperature.

[0078] As a further solution of the present invention: In the sixth step, when P1<P adjust -β PWhen , it indicates that the current ink pressure is low, and a pressure increase signal is generated. The pressure increase signal is used to combine the pressure adjustment value and adjust the working state of the ink pressure pump through the control module to restore the ink pressure to the optimal working pressure;

[0079] When P1>P adjust +β P When , it indicates that the current ink pressure is high, and a pressure reduction signal is generated. The pressure reduction signal is used to combine with the pressure adjustment value, and the working state of the ink pressure pump is adjusted through the control module to restore the ink pressure to the optimal working pressure;

[0080] When P adjust -β P ≤P1≤P adjust +β P When , it means that the current ink pressure is moderate and no corresponding pressure adjustment signal is generated;

[0081] In the formula, β P A supplementary factor preset based on ink pressure.

[0082] Beneficial effects of the present invention:

[0083] Adapt to production rhythm: By dynamically adjusting the inkjet speed parameters according to the product transmission speed data of the production line, the inkjet speed can be matched with the product transmission speed. When the product transmission speed is fast, the inkjet speed is increased accordingly, and when the transmission speed is slow, the inkjet speed is reduced. When the product transmission speed is consistent with the standard speed, the inkjet speed is kept unchanged, which effectively avoids problems such as inkjet omissions or poor inkjet effects caused by speed mismatch, and ensures that the inkjet work can be completed accurately and efficiently under different production rhythms.

[0084] Accurately determine the adjustment speed: With the help of the preset product transmission speed standard value, the pre-set basic inkjet speed and the preset speed adjustment coefficient, the adjusted current inkjet speed can be accurately calculated through a specific adjustment formula, which improves the scientificity and accuracy of the inkjet speed adjustment.

[0085] Comprehensively guarantee the quality of inkjet printing: Comprehensively consider the two factors that have an important impact on the quality of inkjet printing, namely nozzle temperature and ink pressure, and establish the relationship model between nozzle temperature and inkjet printing quality, as well as the relationship model between ink pressure and inkjet printing quality. The quality of inkjet printing is controlled from multiple key dimensions, which comprehensively guarantees the stability and consistency of the quality of inkjet printing.

[0086] Accurately determine the best parameters: Use scientific experimental methods and reasonable mathematical fitting methods to accurately determine the best nozzle temperature and ink pressure, providing a reliable reference standard for adjusting the coding quality.

[0087] Real-time feedback and automatic adjustment: By comparing the current nozzle temperature and ink pressure with the optimal values, it can determine in real time whether to generate corresponding temperature adjustment signals and pressure adjustment signals, and determine the specific temperature adjustment values ​​and pressure adjustment values. Then, with the help of the control execution unit, the nozzle temperature and ink pressure are automatically adjusted, realizing real-time monitoring and automatic optimization of the coding quality, reducing the errors and lags of manual intervention, and greatly improving the coding quality and the intelligence of the entire coding work.

[0088] In general, the intelligent control system can improve the adaptability, accuracy and coding quality of the inkjet printer during operation, realize the intelligent and efficient management and control of the inkjet printer operation, and ensure the stability and high-quality development of the product coding process on the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] The present invention will be further described below in conjunction with the accompanying drawings.

[0090] Figure 1 It is a system block diagram of the intelligent control system of the inkjet printer based on the Internet of Things of the present invention.

[0091] Figure 2 It is a module flow diagram of the control and analysis unit in the intelligent control system of the inkjet printer based on the Internet of Things of the present invention. DETAILED DESCRIPTION

[0092] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0093] Embodiment 1

[0094] See also Figure 1 and Figure 2 As shown, the present invention is an intelligent control system for inkjet printers based on the Internet of Things, comprising:

[0095] The data acquisition module is used to collect various target data during the operation of the inkjet printer, including the inkjet printer's inkjet speed and the product transmission speed of the production line;

[0096] The control and analysis unit is used to dynamically adjust the inkjet speed parameters according to the product transmission speed data of the production line;

[0097] The dynamic adjustment method of spray speed is as follows:

[0098] StepA1. Extract the current product delivery speed of the production line and mark it as Vproduct ;

[0099] StepA2, then increase the product transmission speed V product Compared with the preset product transmission speed standard value V standard Compare and adjust the current inkjet speed based on the preset basic inkjet speed according to the comparison result:

[0100] When V product >V standard ,Right now When , it means that the product transmission speed is faster than the standard speed, and the current inkjet speed will be increased based on the pre-set basic inkjet speed;

[0101] When V product <V standard ,Right now When the product transmission speed is slower than the standard speed, the current inkjet speed will be reduced based on the preset basic inkjet speed.

[0102] When V product =V standard , it means that the product transmission speed is consistent with the standard speed, and the current inkjet speed will not be adjusted based on the pre-set basic inkjet speed;

[0103] Step A3, then determine the adjusted current inkjet speed according to the product conveying speed, the preset product conveying speed standard value, and the preset basic inkjet speed;

[0104] The adjustment formula is:

[0105] ;

[0106] Among them, V adjust is the current printing speed after adjustment, V base is the preset basic inkjet speed, and k is the preset speed adjustment coefficient;

[0107] The control execution unit is used to adjust the inkjet speed of the inkjet printer in operation according to the adjusted current inkjet speed obtained by the control analysis unit.

[0108] In this embodiment, the data acquisition module collects the inkjet printer's inkjet speed and the product transmission speed of the production line, and the control and analysis unit can dynamically adjust the inkjet speed parameters according to the product transmission speed data of the production line. The inkjet printer's inkjet speed can be flexibly changed according to the actual product transmission speed of the production line, avoiding inkjet problems caused by the mismatch between the production line speed and the inkjet speed, such as inkjet omissions or inaccurate inkjet positions, etc., effectively ensuring the coordination of inkjet work and production processes, and improving overall production efficiency and inkjet accuracy.

[0109] Embodiment 2

[0110] As the second embodiment of the present invention, when the present application is implemented, compared with the first embodiment, the technical solution of the present embodiment is different from that of the first embodiment only in that:

[0111] The various target data also include the real-time working temperature of the inkjet printer’s nozzle;

[0112] The control and analysis unit is also used to monitor and adjust the inkjet quality in real time based on the printhead temperature and ink pressure data;

[0113] In this embodiment, if the nozzle temperature is too high or too low, the coding effect will be affected;

[0114] The method is as follows: the inkjet quality is adjusted by establishing a relationship model between the nozzle temperature and the inkjet quality;

[0115] The specific method is as follows:

[0116] Step 1. Establish the relationship model between nozzle temperature and coding quality:

[0117] Step 1.1 Obtain the temperature variation range of the nozzle and record it as [T min , T max ];

[0118] Step 1.2, from the nozzle temperature change range [T min , T max ], n nozzle temperature values ​​are selected at fixed time intervals and marked as T i , i=1, 2, ... n;

[0119] Step 1.3, adjust the nozzle temperature to each selected nozzle temperature value Ti, and then perform m coding experiments, and then obtain the coding quality score value obtained in each experiment, and record it as PT ij , where j = 1, 2, ..., m;

[0120] Among them, the coding quality score is determined by the coding line deviation rate;

[0121] The deviation value of the coding line is obtained as follows:

[0122] Step 1.3.1, obtain the preset required width of the coding line and record it as Wy;

[0123] At the same time, the actual width of the coding line is measured by a high-precision measuring tool and recorded as Ws;

[0124] Step1.3.2, through:

[0125] ;

[0126] Calculate the coding quality score PT;

[0127] In the formula, It is the deviation rate of the coding line between the required width of the coding line and the actual width of the coding line;

[0128] Step 1.4, through:

[0129] ;

[0130] Calculate different nozzle temperature values ​​T i The corresponding average value of the coding quality score Q Ti ;

[0131] Step 1.5, use the polynomial fitting method to establish the relationship between the nozzle temperature and the average value of the coding quality index;

[0132] The fitting polynomial is:

[0133] In the formula, k is the degree of the polynomial;

[0134] In the formula, a0, a1, a2, ... a k The coefficients of the corresponding polynomial when establishing the relationship between the nozzle temperature and the average value of the coding quality index;

[0135] Step 1.6, use the least squares method to determine the coefficient value of the polynomial;

[0136] Among them, the goal of the least squares method is to minimize the sum of squared errors;

[0137] Right now: ;

[0138] Then, the relationship model between the nozzle temperature and the coding quality score is determined based on the coefficient value of the polynomial;

[0139] Its relational model is expressed as:

[0140] ;

[0141] Step 1 and 2: Extract the pre-set coding quality standard score value and mark it as Q target ;

[0142] Then, it is substituted into the relationship model between nozzle temperature and coding quality, and the optimal nozzle temperature corresponding to the coding quality standard score is obtained;

[0143] Among them, the equation corresponding to the optimal nozzle temperature and the coding quality standard score in the relationship model is as follows:

[0144] ;

[0145] Where, T adjust is the optimal nozzle temperature;

[0146] By solving the equation corresponding to the optimal nozzle temperature and the coding quality standard score, the optimal nozzle temperature corresponding to the coding quality standard score is obtained;

[0147] Step 13: Get the current nozzle temperature and mark it as T1;

[0148] Then the current nozzle temperature T1 is compared with the optimal nozzle temperature T adjust Compare and calculate the nozzle temperature T1 and the optimal nozzle temperature T adjust The absolute value of the difference between them is used as the temperature adjustment value;

[0149] When T1<T adjust -β T When , it indicates that the current nozzle temperature is low, and a temperature increase signal is generated. The temperature increase signal is used to combine the temperature adjustment value, and the control module adjusts the heating device disposed on the nozzle to restore the nozzle temperature to the optimal nozzle temperature;

[0150] When T1>T adjust +β T When , it indicates that the current nozzle temperature is high, and a temperature adjustment signal is generated. The temperature adjustment signal is used to combine the temperature adjustment value, and the control module adjusts the cooling device set on the nozzle to restore the nozzle temperature to the optimal nozzle temperature;

[0151] When T adjust -β T ≤T1≤T adjust +β T , it means that the current nozzle temperature is moderate and no corresponding temperature adjustment signal is generated;

[0152] In the formula, β T It is a supplementary factor preset according to the nozzle temperature;

[0153] The control execution unit is also used to control the nozzle temperature of the inkjet printer during operation according to the temperature adjustment value obtained by the control analysis unit and its corresponding temperature adjustment signal.

[0154] Based on the first embodiment, this embodiment adds the monitoring of the nozzle temperature when the inkjet printer is working in real time, and monitors and adjusts the inkjet quality in real time by establishing a relationship model between the nozzle temperature and the inkjet quality. It can accurately judge the impact of the nozzle temperature on the inkjet quality according to the actual situation of the nozzle temperature, timely generate the corresponding temperature adjustment signal and combine the temperature adjustment value, adjust the nozzle heating or cooling device through the control module, and restore the nozzle temperature to the optimal state, thereby ensuring the stability of the inkjet quality, reducing the poor inkjet effect caused by the nozzle temperature being too high or too low, such as the deviation of the inkjet line, and improving the quality of the finished inkjet product.

[0155] Embodiment 3

[0156] As the third embodiment of the present invention, when the present application is implemented, compared with the first and second embodiments, the technical solution of this embodiment is to combine the solutions of the first and second embodiments, and the difference between the technical solution of this embodiment and the first and second embodiments is that in this embodiment:

[0157] The various target data also include the real-time ink pressure of the printer when it is working;

[0158] The control and analysis unit is also used to monitor and adjust the inkjet quality in real time based on the ink pressure data;

[0159] In this embodiment, unstable ink pressure can also cause blurred or incomplete inkjet printing.

[0160] The method is as follows: the inkjet quality is adjusted by establishing a relationship model between ink pressure and inkjet quality;

[0161] The specific method is as follows:

[0162] Step 21: Establish a relationship model between ink pressure and inkjet quality according to the establishment method of the relationship model between nozzle temperature and inkjet quality;

[0163] Its relationship model is through: express;

[0164] In the formula, b0, b1, b2, ... b k The coefficients of the corresponding polynomial when establishing the relationship model between ink pressure and coding quality;

[0165] Step 22: Extract the pre-set coding quality standard score value and mark it as Q target ;

[0166] Then, it is substituted into the relationship model between ink pressure and coding quality, and the optimal ink pressure corresponding to the coding quality standard score is obtained;

[0167] Among them, the equation corresponding to the optimal ink pressure and the coding quality standard score in the relationship model is as follows:

[0168] ;

[0169] Where P adjust is the optimal ink pressure;

[0170] By solving the equation corresponding to the optimal ink pressure and the coding quality standard score, the optimal ink pressure corresponding to the coding quality standard score is obtained;

[0171] Step 23: Get the current ink pressure and mark it as P1;

[0172] Then the current ink pressure P1 is compared with the optimal ink pressure P adjust Compare and calculate the ink pressure P1 and the optimal ink pressure P adjust The absolute value of the difference between them is used as the pressure adjustment value;

[0173] When P1<P adjust -β P When , it indicates that the current ink pressure is low, and a pressure increase signal is generated. The pressure increase signal is used to combine the pressure adjustment value and adjust the working state of the ink pressure pump through the control module to restore the ink pressure to the optimal working pressure;

[0174] When P1>P adjust +β P When , it indicates that the current ink pressure is high, and a pressure reduction signal is generated. The pressure reduction signal is used to combine with the pressure adjustment value, and the working state of the ink pressure pump is adjusted through the control module to restore the ink pressure to the optimal working pressure;

[0175] When P adjust -β P ≤P1≤P adjust +β P When , it means that the current ink pressure is moderate and no corresponding pressure adjustment signal is generated;

[0176] In the formula, β P A supplementary factor preset according to ink pressure;

[0177] The control execution unit is also used to adjust the ink pressure of the inkjet printer during operation according to the pressure adjustment value and its corresponding pressure adjustment signal obtained by the control analysis unit.

[0178] Based on the first and second embodiments, this embodiment further incorporates the ink pressure of the inkjet printer during real-time operation as monitoring data, and also monitors and adjusts the inkjet quality in real time by establishing a relationship model between ink pressure and inkjet quality. Since unstable ink pressure can lead to quality problems such as blurred or incomplete inkjet characters, this embodiment can generate a pressure adjustment signal based on the comparison between the current ink pressure and the optimal ink pressure, and in combination with the pressure adjustment value, adjust the working state of the ink pressure pump through the control module, and restore the ink pressure to the optimal working pressure. Starting from the key factor of ink pressure to ensure the quality of inkjet, it works together with factors such as nozzle temperature to ensure the clarity and completeness of the inkjet in all directions, and improve the stability and reliability of the inkjet quality.

[0179] Embodiment 4

[0180] As the fourth embodiment of the present invention, when the present application is specifically implemented, compared with the first, second and third embodiments, the technical solution of this embodiment is to combine and implement the solutions of the above-mentioned first, second and third embodiments.

[0181] This embodiment combines the solutions of Embodiments 1, 2, and 3, integrating multiple functions such as the adaptation and adjustment of the inkjet speed and the speed of the production line, the regulation of the inkjet quality by the nozzle temperature, and the guarantee of the inkjet quality by the ink pressure. It can comprehensively monitor and dynamically adjust multiple key parameters during the operation of the inkjet printer in real time, and ensure to the greatest extent that the inkjet printer can complete the inkjet work efficiently, stably, and with high quality under different production conditions, comprehensively improve the overall performance of the intelligent control system of the inkjet printer, and meet the diversified and high-quality production inkjet requirements.

[0182] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and thresholds in the formula are set by technicians in this field according to actual conditions.

[0183] 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.

Claims

1. The intelligent control system of inkjet printer based on Internet of Things is characterized by: include: The data acquisition module is used to collect various target data during the operation of the inkjet printer, including the real-time nozzle temperature, ink pressure, inkjet speed, and product transmission speed of the production line; The control and analysis unit is used to dynamically adjust the inkjet speed parameters according to the product transmission speed data of the production line, and determine the adjusted current inkjet speed through the dynamic adjustment of the inkjet speed; the dynamic adjustment method of the inkjet speed is as follows: StepA1. Extract the current product delivery speed of the production line and mark it as V product ; StepA2, then increase the product transmission speed V product Compared with the preset product transmission speed standard value V standard Compare and adjust the current inkjet speed based on the preset basic inkjet speed according to the comparison result: Step A3, then determine the adjusted current inkjet speed according to the product conveying speed, the preset product conveying speed standard value, and the preset basic inkjet speed; It is also used to monitor and adjust the inkjet quality in real time according to the nozzle temperature and ink pressure data; the method is: by establishing a nozzle temperature and inkjet quality relationship model and an ink pressure and inkjet quality relationship model to determine the optimal nozzle temperature and the optimal ink pressure, and then combine the optimal nozzle temperature and the optimal ink pressure with the current nozzle temperature and ink pressure respectively to determine whether to generate a corresponding temperature adjustment signal and a pressure adjustment signal, and determine the temperature adjustment value and the pressure adjustment value according to the generation of the temperature adjustment signal and the pressure adjustment signal; The real-time monitoring adjustment method is as follows: The first step is to establish a model of the relationship between nozzle temperature and coding quality: Step 1.1 Obtain the temperature variation range of the nozzle and record it as [T min , T max ]; Step 1.2, from the nozzle temperature variation range [T min , T max ], n nozzle temperature values ​​are selected at fixed time intervals and marked as T i , i=1, 2, ... n; Step 1.3, adjust the nozzle temperature to each selected nozzle temperature value Ti, and then perform m coding experiments, and then obtain the coding quality score value obtained in each experiment, and record it as PT ij , where j = 1, 2, ... m; Step 1.4, then calculate the different nozzle temperature values ​​T i The corresponding average of the coding quality scores is recorded as Q Ti ; Step 1.5, use the polynomial fitting method to establish the relationship between the nozzle temperature and the average value of the coding quality index; The fitting polynomial is: ; In the formula, k is the degree of the polynomial, T is the nozzle temperature; In the formula, a0, a1, a2, ... a k The coefficients of the corresponding polynomial when establishing the relationship between the nozzle temperature and the average value of the coding quality index; Step 1.6, use the least squares method to determine the coefficient value of the polynomial; Then, the relationship model between the nozzle temperature and the coding quality score is determined based on the coefficient value of the polynomial; Its relational model is expressed as: ； The second step is to establish a relationship model between ink pressure and inkjet quality according to the establishment method of the relationship model between nozzle temperature and inkjet quality; Its relationship model is through: express; In the formula, b0, b1, b2, ... b k The coefficients of the corresponding polynomial when establishing the relationship model between ink pressure and coding quality, P is the ink pressure; Step 3: Extract the pre-set coding quality standard score value and mark it as Q target ; Then, it is substituted into the relationship model between nozzle temperature and coding quality, and the optimal nozzle temperature corresponding to the coding quality standard score is obtained; Step 4: Get the current nozzle temperature and mark it as T1; Then the current nozzle temperature T1 is compared with the optimal nozzle temperature T adjust Compare and calculate the nozzle temperature T1 and the optimal nozzle temperature T adjust The absolute value of the difference between them is used as the temperature adjustment value; Step 5: Extract the pre-set coding quality standard score value and mark it as Q target ; Then, it is substituted into the relationship model between ink pressure and coding quality, and the optimal ink pressure corresponding to the coding quality standard score is obtained; Step 6. Get the current ink pressure and mark it as P1; Then the current ink pressure P1 is compared with the optimal ink pressure P adjust Compare and calculate the ink pressure P1 and the optimal ink pressure P adjust The absolute value of the difference between them is used as the pressure adjustment value; The control execution unit is used to adjust the nozzle temperature, ink pressure and coding speed of the inkjet printer during operation according to the adjusted current coding speed, temperature adjustment value and its corresponding temperature adjustment signal, pressure adjustment value and its corresponding pressure adjustment signal obtained by the control analysis unit.

2. The intelligent control system for inkjet printer based on Internet of Things according to claim 1 is characterized in that: The comparison and adjustment in StepA2 are as follows: When V product >V standard ,Right now When , it means that the product transmission speed is faster than the standard speed, and the current inkjet speed will be increased based on the pre-set basic inkjet speed; When V product <V standard ,Right now When the product transmission speed is slower than the standard speed, the current inkjet speed will be reduced based on the preset basic inkjet speed. When V product =V standard , it means that the product transmission speed is consistent with the standard speed, and the current coding speed will not be adjusted based on the pre-set basic coding speed.

3. The intelligent control system for inkjet printer based on Internet of Things according to claim 1 is characterized in that: In StepA3, the corresponding adjustment formula is: ； Among them, V adjust is the current printing speed after adjustment, V base is the preset basic inkjet speed, and k is the preset speed adjustment coefficient.

4. The intelligent control system for inkjet printer based on Internet of Things according to claim 1 is characterized in that: in, The coding quality score is determined by the coding line deviation rate.

5. The intelligent control system for inkjet printer based on Internet of Things according to claim 4 is characterized in that: The deviation value of the coding line is obtained as follows: Step 1.3.1, obtain the preset required width of the coding line and record it as Wy; At the same time, the actual width of the coding line is measured by a high-precision measuring tool and recorded as Ws; Step1.3.2, through: ； Calculate the coding quality score PT; In the formula, It is the deviation rate of the coding line between the required coding line width and the actual coding line width.

6. The intelligent control system for inkjet printer based on Internet of Things according to claim 1 is characterized in that: The equation corresponding to the optimal nozzle temperature and the coding quality standard score in the relationship model is as follows: ； Where, T adjust is the optimal nozzle temperature; By solving the equation corresponding to the optimal nozzle temperature and the coding quality standard score, the optimal nozzle temperature corresponding to the coding quality standard score is obtained; The equation corresponding to the optimal ink pressure and the coding quality standard score in the relationship model is as follows: ； Where P adjust is the optimal ink pressure; By solving the equation corresponding to the optimal ink pressure and the coding quality standard score, the optimal ink pressure corresponding to the coding quality standard score is obtained.

7. The intelligent control system for inkjet printer based on Internet of Things according to claim 1 is characterized in that: In the fourth step, when T1<T adjust -β T When , it indicates that the current nozzle temperature is low, and a temperature increase signal is generated. The temperature increase signal is used to combine the temperature adjustment value, and the control module adjusts the heating device disposed on the nozzle to restore the nozzle temperature to the optimal nozzle temperature; When T1>T adjust +β T When , it indicates that the current nozzle temperature is high, and a temperature adjustment signal is generated. The temperature adjustment signal is used to combine the temperature adjustment value, and the control module adjusts the cooling device set on the nozzle to restore the nozzle temperature to the optimal nozzle temperature; When T adjust -β T ≤T1≤T adjust +β T , it means that the current nozzle temperature is moderate and no corresponding temperature adjustment signal is generated; In the formula, β T It is a supplementary factor preset according to the nozzle temperature.

8. The intelligent control system for inkjet printer based on Internet of Things according to claim 1 is characterized in that: In the sixth step, when P1<P adjust -β P When , it indicates that the current ink pressure is low, and a pressure increase signal is generated. The pressure increase signal is used to combine the pressure adjustment value and adjust the working state of the ink pressure pump through the control module to restore the ink pressure to the optimal working pressure; When P1>P adjust +β P When , it indicates that the current ink pressure is high, and a pressure reduction signal is generated. The pressure reduction signal is used to combine with the pressure adjustment value, and the working state of the ink pressure pump is adjusted through the control module to restore the ink pressure to the optimal working pressure; When P adjust -β P ≤P1≤P adjust +β P When , it means that the current ink pressure is moderate and no corresponding pressure adjustment signal is generated; In the formula, β P A supplementary factor preset based on ink pressure.

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