Printing system and printing method of ink-jet printer

Abstract

The invention discloses a printing system and a printing method of an ink-jet printer. The printing system of the ink-jet printer comprises a printing head and a controller, the printing head is electrically connected with the controller, and the printing head is provided with a plurality of spraying holes used for ink jetting; the controller comprises an ink jet information generation module, a blocked spray hole determination module and a dredging instruction generation module; the ink jet information generation module is used for generating target ink jet information corresponding to each jet hole, the target ink jet information comprises multiple sets of ink jet data, and each set of ink jet data comprises the current ink jet amount, the ink jet time and the ink type; the blocked spraying hole determining module is used for determining a target spraying hole needing to be dredged; the dredging instruction generation module is used for sending a dredging instruction to the printing head; and the printing head is used for dredging the target spraying hole. According to the printing system of the ink-jet printer, the target spray hole needing to be dredged can be determined according to the historical ink-jet information, and the target spray hole is selectively dredged, so that the service time of the ink box can be prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of inkjet printers, and in particular to a printing system and a printing method of an inkjet printer. Background Art

[0002] An inkjet printer is a printing device that sprays ink onto paper through a nozzle to form text or images. Its working principle is to spray ink onto the printing medium through a nozzle to form text or images. Inkjet printers are usually controlled by a single-chip microcomputer, which forms a printable image after data processing, and then sprays ink onto paper by heating or vibrating the nozzle.

[0003] When using an inkjet printer, the nozzles of the print head are easily clogged, which affects the print quality. In the related art, the inkjet printer unclogs the nozzles on the print head through the self-cleaning function. However, since it is impossible to accurately identify the clogged nozzles on the print head, the inkjet printer generally unclogs all the nozzles on the print head at the same time, resulting in a large loss of ink and a reduced usable time of the ink cartridge. Summary of the invention

[0004] The present application provides a printing system and a printing method for an inkjet printer, so as to solve the technical problem that an inkjet printer generally dredges all nozzles on a print head at the same time, resulting in a large loss of ink and a reduced usable time of an ink cartridge.

[0005] In order to solve the above technical problems, in a first aspect, the present application provides a printing system of an inkjet printer, comprising: a print head and a controller, the print head being electrically connected to the controller, the print head being provided with a plurality of nozzles for inkjet;

[0006] The controller includes an inkjet information generation module, a blocked nozzle hole determination module and a dredging instruction generation module;

[0007] The inkjet information generation module is used to generate target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head, wherein the target inkjet information includes multiple groups of inkjet data, each group of the inkjet data includes the current inkjet amount and the inkjet time and ink type corresponding to the current inkjet amount, wherein different groups of inkjet data correspond to different inkjet times;

[0008] The blocked nozzle orifice determination module is used to determine the target nozzle orifice that needs to be unblocked according to the target inkjet information by using a pre-trained nozzle orifice blockage prediction model, wherein the nozzle orifice blockage prediction model is an autoregressive moving average model;

[0009] The dredging instruction generation module is used to generate a dredging instruction corresponding to the target nozzle hole, and send the dredging instruction to the print head;

[0010] The print head is used to dredge the target nozzle hole according to the dredging instruction.

[0011] When the printing system of the above-mentioned inkjet printer is working, the inkjet information generation module first generates the target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head; then the blocked nozzle determination module uses the pre-trained nozzle blockage prediction model to determine the target nozzle that needs to be dredged according to the target inkjet information; then the dredging instruction generation module generates the dredging instruction corresponding to the target nozzle, sends the dredging instruction to the print head, and finally dredges the target nozzle according to the dredging instruction through the print head. It can be seen that through the mutual cooperation of the inkjet information generation module, the blocked nozzle determination module and the dredging instruction generation module, before the printing system of the inkjet printer executes the printing task, the target nozzle that needs to be dredged can be determined in advance by the controller and the target nozzle can be dredged by the print head, and then the corresponding nozzle can be controlled by the print head to perform inkjet operation to complete the printing task, thereby improving the printing quality of the printing system of the inkjet printer; further, because the printing system of the inkjet printer dredges the target nozzle in a targeted manner, it avoids the waste of ink caused by dredging all nozzles on the print head, and improves the service life of the ink cartridge.

[0012] In one embodiment, the inkjet information generation module includes an information acquisition submodule, an information processing submodule and an information generation submodule;

[0013] The information acquisition submodule is used to acquire the historical ink ejection information of the print head, wherein the historical ink ejection information includes the ink ejection amount sequence of each nozzle hole when performing the ink ejection operation from the last time the nozzle hole was dredged to the current moment, and the ink ejection time and ink category corresponding to each ink ejection amount value in the ink ejection amount sequence, wherein the ink ejection amount values ​​in the ink ejection amount sequence are sorted according to the time sequence of the ink ejection operation;

[0014] The information processing submodule is used for grouping the inkjet volume sequence according to the time intervals of inkjet operations corresponding to adjacent inkjet volume values ​​in the inkjet volume sequence for each of the nozzles to obtain a plurality of inkjet quantum sequences, wherein the time intervals of inkjet operations corresponding to adjacent inkjet volume values ​​in the inkjet quantum sequence are less than a preset time interval threshold;

[0015] The information generation submodule is used to generate the inkjet data for each of the nozzles according to the inkjet quantum sequence, wherein each of the inkjet quantum sequences corresponds to a group of the inkjet data, and the inkjet volume at that time is equal to the maximum value of the inkjet volume value in the corresponding inkjet quantum sequence.

[0016] In one embodiment, the inkjet information generation module further includes a time interval threshold adjustment submodule;

[0017] The time interval threshold adjustment submodule is used to adjust the preset time interval threshold corresponding to each nozzle according to the inkjet type of the nozzle using a preset adjustment function. The expression of the preset adjustment function is:

[0018]

[0019] Wherein, T represents the preset time interval threshold, d represents the diameter of the nozzle, u represents the average wind speed of the environment, Pv represents the saturated vapor pressure of the ink solvent, M represents the molecular weight of the ink solvent, and s is a constant.

[0020] In one embodiment, the blocked nozzle hole determination module includes a data input submodule and a blocked nozzle hole determination submodule;

[0021] The data input submodule is used to input the target inkjet information into the nozzle blockage prediction model to obtain a blockage rate prediction value of each nozzle;

[0022] The blocked nozzle hole determination submodule is used to determine the nozzle hole whose corresponding blockage rate prediction value is greater than a preset blockage rate threshold as the target nozzle hole.

[0023] In one embodiment, the blocked nozzle hole determination module further includes a blockage rate threshold adjustment submodule;

[0024] The blocking rate threshold adjustment submodule is used to adjust the preset blocking rate threshold according to current printing demand information.

[0025] In one embodiment, the print head is used to control a positive pressure pump to eject ink, and the target nozzle hole is unblocked by the ink ejection pressure of the positive pressure pump.

[0026] In one embodiment, the print head is used to determine the positive unclogging pressure of each target nozzle hole through the blockage rate prediction value corresponding to each target nozzle hole, and control the positive pressure pump to dredge each target nozzle hole with the positive unclogging pressure corresponding to each target nozzle hole.

[0027] In one embodiment, the print head is used to control a negative pressure pump to absorb ink, and the target nozzle hole is unblocked by the ink absorption pressure of the negative pressure pump.

[0028] In one embodiment, the print head is used to determine the negative pressure dredging pressure of each target nozzle hole through the blockage rate prediction value corresponding to each target nozzle hole, and control the negative pressure pump to dredge each target nozzle hole with the negative pressure dredging pressure corresponding to each target nozzle hole.

[0029] In a second aspect, the present application provides a printing method of an inkjet printer, which is applied to the printing system of the above-mentioned inkjet printer, and the method comprises:

[0030] The inkjet information generation module generates target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head, wherein the target inkjet information includes multiple groups of inkjet data, each group of the inkjet data includes the current inkjet amount and the inkjet time and ink type corresponding to the current inkjet amount, wherein different groups of inkjet data correspond to different inkjet times;

[0031] The blocked nozzle orifice determination module uses a pre-trained nozzle orifice blockage prediction model to determine the target nozzle orifice that needs to be unblocked according to the target inkjet information, and the nozzle orifice blockage prediction model is an autoregressive moving average model;

[0032] The dredging instruction generation module generates a dredging instruction corresponding to the target nozzle hole, and sends the dredging instruction to the print head;

[0033] The print head dredges the target nozzle hole according to the dredging instruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a printing system of an inkjet printer shown in an embodiment of the present application;

[0035] Figure 2 A schematic flow chart of a printing method of an inkjet printer according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a printing system of an inkjet printer provided in an embodiment of the present application.

[0038] like Figure 1 As shown, the printing system of the inkjet printer of this embodiment includes a print head and a controller. The print head is electrically connected to the controller, and the print head is provided with a plurality of nozzles for inkjetting. The controller includes an inkjet information generation module, a blocked nozzle determination module and a dredging instruction generation module.

[0039] Among them, the inkjet information generation module is used to generate target inkjet information corresponding to each of the nozzles according to the historical inkjet information of the print head, the target inkjet information includes multiple groups of inkjet data, each group of inkjet data includes the current inkjet volume and the inkjet time and ink category corresponding to the current inkjet volume, and different groups of inkjet data correspond to different inkjet times; the blocked nozzle determination module is used to use the pre-trained nozzle blockage prediction model to determine the target nozzle that needs to be unblocked according to the target inkjet information, and the nozzle blockage prediction model is an autoregressive moving average model; the unblocking instruction generation module is used to generate the unblocking instruction corresponding to the target nozzle, and send the unblocking instruction to the print head; the print head is used to unblock the target nozzle according to the unblocking instruction.

[0040] The autoregressive moving average model is a time series prediction model that combines the characteristics of the autoregressive model and the moving average model to capture the autocorrelation of time series data and use historical data to predict future values. Since there is a time sequence between different groups of inkjet data in the target inkjet information, the autoregressive moving average model can accurately determine the blockage status of each nozzle at the current moment based on the target inkjet information of each nozzle.

[0041] When the printing system of the above-mentioned inkjet printer is working, the inkjet information generation module first generates the target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head; then the blocked nozzle determination module uses the pre-trained nozzle blockage prediction model to determine the target nozzle that needs to be dredged according to the target inkjet information; then the dredging instruction generation module generates the dredging instruction corresponding to the target nozzle, sends the dredging instruction to the print head, and finally dredges the target nozzle according to the dredging instruction through the print head. It can be seen that through the mutual cooperation of the inkjet information generation module, the blocked nozzle determination module and the dredging instruction generation module, before the printing system of the inkjet printer executes the printing task, the target nozzle that needs to be dredged can be determined in advance by the controller and the target nozzle can be dredged by the print head, and then the corresponding nozzle can be controlled by the print head to perform inkjet operation to complete the printing task, thereby improving the printing quality of the printing system of the inkjet printer; further, because the printing system of the inkjet printer dredges the target nozzle in a targeted manner, it avoids the waste of ink caused by dredging all nozzles on the print head, and improves the service life of the ink cartridge.

[0042] In an optional embodiment, the inkjet information generation module includes an information acquisition submodule, an information processing submodule and an information generation submodule. The information acquisition submodule is used to obtain the historical inkjet information of the print head, and the historical inkjet information includes the inkjet volume sequence of each nozzle from the last dredging to the current moment when the inkjet operation is performed, and the inkjet time and ink category corresponding to each inkjet volume value in the inkjet volume sequence, and the inkjet volume values ​​in the inkjet volume sequence are sorted according to the time sequence of the inkjet operation; the information processing submodule is used to group the inkjet volume sequence according to the time interval of the inkjet operation corresponding to the adjacent inkjet volume values ​​in the inkjet volume sequence for each nozzle to obtain multiple inkjet quantum sequences, and the inkjet operation time interval corresponding to the adjacent inkjet volume values ​​in the inkjet quantum sequence is less than the preset time interval threshold; the information generation submodule is used to generate inkjet data according to the inkjet quantum sequence for each nozzle, and each inkjet quantum sequence corresponds to a group of inkjet data, when the inkjet volume is equal to the maximum value of the inkjet volume value in the corresponding inkjet quantum sequence.

[0043] It should be noted that after the print head completes each printing task, ink remains at the nozzle. As the solvent in the residual ink evaporates, the formed ink blocks will be deposited inside the nozzle. Moreover, the ink blocks formed after the next printing task will continue to be deposited on the surface of the ink blocks formed when the previous printing task was performed, so that the volume of the ink blocks deposited inside the nozzle gradually increases, and the degree of blockage of the nozzle continues to increase, eventually leading to complete blockage of the nozzle. Furthermore, during the execution of the same printing task, although the nozzle will perform multiple inkjet operations successively, since the time interval between adjacent inkjet operations during the same printing task is small, no ink blocks will be deposited inside the nozzle during the same printing task. Therefore, this embodiment obtains the inkjet volume sequence when the nozzle performs the inkjet operation from the last time the nozzle was unblocked to the current moment, as well as the inkjet time and ink category corresponding to each inkjet volume value in the inkjet volume sequence through the information acquisition submodule, and groups the inkjet volume sequence according to the time interval of the inkjet operations corresponding to adjacent inkjet volume values ​​in the inkjet volume sequence through the information processing submodule to obtain multiple inkjet quantum sequences, so that all the inkjet operations corresponding to the inkjet volume sequence can be classified into multiple different printing tasks, and the inkjet operations corresponding to each inkjet quantum sequence are classified as one printing task, so that the inkjet data generated by the information generation submodule is more accurate, and further the target nozzle generated by the blocked nozzle determination module is more accurate.

[0044] In different printing tasks, due to different printing settings, the ink ejection amount of the nozzle may be different, resulting in different volumes of ink blocks deposited inside the nozzle. Therefore, the maximum value of the ink ejection amount in the ink ejection quantum sequence is determined as the ink ejection amount at that time. The size of the ink ejection amount at that time can represent the volume of the ink blocks deposited in the corresponding printing task. Furthermore, in different printing tasks, due to different printing settings, the ink types corresponding to the nozzles may be different, which may also result in different volumes of ink blocks deposited inside the nozzles.

[0045] By utilizing the pre-trained nozzle blockage prediction model, based on multiple sets of inkjet data including the current inkjet volume, the inkjet time corresponding to the current inkjet volume, and the ink category corresponding to the current inkjet volume, the process of ink block deposition inside the nozzle can be simulated and modeled to determine the blockage status of each nozzle on the print head, thereby determining the target nozzle.

[0046] Furthermore, the inkjet information generation module also includes a time interval threshold adjustment submodule. The time interval threshold adjustment submodule is used to adjust the preset time interval threshold corresponding to each nozzle according to the inkjet type of the nozzle using a preset adjustment function. The expression of the preset adjustment function is:

[0047]

[0048] Wherein, T represents the preset time interval threshold, d represents the diameter of the nozzle, u represents the average wind speed of the environment, Pv represents the saturated vapor pressure of the ink solvent, M represents the molecular weight of the ink solvent, and s is a constant. Further, d can be directly obtained through the model parameters of the print head, u adopts a preset value, Pv is the saturated vapor pressure of the ink main solvent corresponding to the ink category and can be determined by the ink category, M is the molecular weight of the ink main solvent corresponding to the ink category and can be determined by the ink category, and s adopts a preset value.

[0049] During the operation of the print head, different nozzles may use different inkjet types. For example, some nozzles use black ink, while others use yellow ink. Different inks have different compositions, which results in different speeds at which the residual ink solvent inside different nozzles evaporates to form ink blocks. Therefore, the preset time interval threshold can be adjusted according to the inkjet type, so as to more accurately obtain the inkjet quantum sequence according to the inkjet volume sequence.

[0050] In an optional embodiment, the blocked nozzle determination module includes a data input submodule and a blocked nozzle determination submodule; the data input submodule is used to input the target inkjet information into the nozzle blockage prediction model to obtain the blockage rate prediction value of each nozzle; the blocked nozzle determination submodule is used to determine the nozzle whose corresponding blockage rate prediction value is greater than the preset blockage rate threshold as the target nozzle.

[0051] Through the cooperation of the data input submodule and the blocked nozzle hole determination submodule, the target nozzle holes that need to be unblocked on the print head can be determined according to the predicted blockage rate value of each nozzle hole on the print head, and the print head can unblock the target nozzle holes.

[0052] Preferably, the blocked nozzle determination module further includes a blockage rate threshold adjustment submodule; the blockage rate threshold adjustment submodule is used to adjust the preset blockage rate threshold according to the current printing demand information. For example, if the current printing demand information has a high print quality requirement, the preset blockage rate threshold can be lowered to meet the print quality requirement; if the current printing demand information has a low print quality requirement, the preset blockage rate threshold can be increased to reduce unnecessary nozzle dredging costs while meeting the print quality requirement.

[0053] In an optional embodiment, the print head is used to control the positive pressure pump to spray ink, and the target nozzle hole is unblocked by the ink spray pressure of the positive pressure pump. Further, the print head is used to determine the positive pressure unblocking pressure of each target nozzle hole by the blockage rate prediction value corresponding to each target nozzle hole, and control the positive pressure pump to unblock each target nozzle hole respectively with the positive pressure unblocking pressure corresponding to each target nozzle hole.

[0054] The positive unclogging pressure of each target nozzle hole is determined by the blockage rate prediction value corresponding to each target nozzle hole, and a larger positive pressure unclogging pressure is selected when the blockage rate prediction value is larger, and a smaller positive pressure unclogging pressure is selected when the blockage rate prediction value is smaller. This can avoid damage to the nozzle hole caused by excessive positive pressure unclogging pressure, and can also avoid unclogging failure caused by too small positive pressure unclogging pressure.

[0055] The print head is used to control the negative pressure pump to absorb ink, and the target nozzle hole is unblocked by the ink absorption pressure of the negative pressure pump. Further, the print head is used to determine the negative pressure unblocking pressure of each target nozzle hole by the blockage rate prediction value corresponding to each target nozzle hole, and control the negative pressure pump to unblock each target nozzle hole respectively with the negative pressure unblocking pressure corresponding to each target nozzle hole.

[0056] The negative pressure dredging pressure of each target nozzle hole is determined by the blockage rate prediction value corresponding to each target nozzle hole, and a larger negative pressure dredging pressure is selected when the blockage rate prediction value is larger, and a smaller negative pressure dredging pressure is selected when the blockage rate prediction value is smaller. This can avoid damage to the nozzle hole caused by excessive negative pressure dredging pressure, and can also avoid dredging failure caused by too small negative pressure dredging pressure.

[0057] Please refer to Figure 2 , Figure 2 Disclosed is a printing method of an inkjet printer, which is applied to the printing system of the inkjet printer, and comprises steps S01 to S04.

[0058] Step S01: The inkjet information generation module generates target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head, wherein the target inkjet information includes multiple groups of inkjet data, each group of the inkjet data includes the current inkjet volume and the inkjet time and ink category corresponding to the current inkjet volume, wherein different groups of inkjet data correspond to different inkjet times.

[0059] Step S02: the blocked nozzle orifice determination module uses a pre-trained nozzle orifice blockage prediction model to determine the target nozzle orifice that needs to be unblocked according to the target inkjet information, and the nozzle orifice blockage prediction model is an autoregressive moving average model.

[0060] Step S03: the dredging instruction generation module generates a dredging instruction corresponding to the target nozzle hole, and sends the dredging instruction to the print head.

[0061] Step S04: the print head dredges the target nozzle hole according to the dredging instruction.

[0062] It can be seen that by executing steps SO1 to S04, the printing system of the inkjet printer can determine the target nozzle holes that need to be unclogged in advance through the controller before executing the printing task, and the target nozzle holes can be unclogged by the print head, and then the corresponding nozzle holes can be controlled by the print head to perform inkjet operations to complete the printing task, thereby improving the printing quality of the printing system of the inkjet printer; further, since the printing system of the inkjet printer unclogs the target nozzle holes in a targeted manner, the waste of ink caused by unclogging all nozzles on the print head is avoided, and the service life of the ink cartridge is increased.

[0063] In several embodiments provided in the present application, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a 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 box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0064] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0065] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A printing system for an inkjet printer, characterized in that: include: A print head and a controller, wherein the print head is electrically connected to the controller and the print head is provided with a plurality of nozzles for ejecting ink; The controller includes an inkjet information generation module, a blocked nozzle hole determination module and a dredging instruction generation module; The inkjet information generation module is used to generate target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head, wherein the target inkjet information includes multiple groups of inkjet data, each group of the inkjet data includes the current inkjet amount and the inkjet time and ink type corresponding to the current inkjet amount, wherein different groups of inkjet data correspond to different inkjet times; The blocked nozzle orifice determination module is used to determine the target nozzle orifice that needs to be unblocked according to the target inkjet information by using a pre-trained nozzle orifice blockage prediction model, wherein the nozzle orifice blockage prediction model is an autoregressive moving average model; The dredging instruction generation module is used to generate a dredging instruction corresponding to the target nozzle hole, and send the dredging instruction to the print head; The print head is used to dredge the target nozzle hole according to the dredging instruction.

2. The printing system of the inkjet printer according to claim 1, characterized in that: The inkjet information generation module includes an information acquisition submodule, an information processing submodule and an information generation submodule; The information acquisition submodule is used to acquire the historical ink ejection information of the print head, wherein the historical ink ejection information includes the ink ejection amount sequence of each nozzle hole when performing the ink ejection operation from the last time the nozzle hole was dredged to the current moment, and the ink ejection time and ink category corresponding to each ink ejection amount value in the ink ejection amount sequence, wherein the ink ejection amount values ​​in the ink ejection amount sequence are sorted according to the time sequence of the ink ejection operation; The information processing submodule is used for grouping the inkjet volume sequence according to the time intervals of inkjet operations corresponding to adjacent inkjet volume values ​​in the inkjet volume sequence for each of the nozzles to obtain a plurality of inkjet quantum sequences, wherein the time intervals of inkjet operations corresponding to adjacent inkjet volume values ​​in the inkjet quantum sequence are less than a preset time interval threshold; The information generation submodule is used to generate the inkjet data for each of the nozzles according to the inkjet quantum sequence, wherein each of the inkjet quantum sequences corresponds to a group of the inkjet data, and the inkjet volume at that time is equal to the maximum value of the inkjet volume value in the corresponding inkjet quantum sequence.

3. The printing system of the inkjet printer according to claim 2, characterized in that: The inkjet information generation module also includes a time interval threshold adjustment submodule; The time interval threshold adjustment submodule is used to adjust the preset time interval threshold corresponding to each nozzle according to the inkjet type of the nozzle using a preset adjustment function. The expression of the preset adjustment function is: Wherein, T represents the preset time interval threshold, d represents the diameter of the nozzle, u represents the average wind speed of the environment, Pv represents the saturated vapor pressure of the ink solvent, M represents the molecular weight of the ink solvent, and s is a constant.

4. The printing system of the inkjet printer according to claim 3, characterized in that: The blocked nozzle hole determination module includes a data input submodule and a blocked nozzle hole determination submodule; The data input submodule is used to input the target inkjet information into the nozzle blockage prediction model to obtain a blockage rate prediction value of each nozzle; The blocked nozzle hole determination submodule is used to determine the nozzle hole whose corresponding blockage rate prediction value is greater than a preset blockage rate threshold as the target nozzle hole.

5. The printing system of the inkjet printer according to claim 4, characterized in that: The blocked nozzle determination module also includes a blockage rate threshold adjustment submodule; The blocking rate threshold adjustment submodule is used to adjust the preset blocking rate threshold according to current printing demand information.

6. The printing system of the inkjet printer according to claim 4 or 5, characterized in that: The print head is used to control the positive pressure pump to spray ink, and the target nozzle hole is unblocked by the ink spraying pressure of the positive pressure pump.

7. The printing system of the inkjet printer according to claim 6, characterized in that: The print head is used to determine the positive dredging pressure of each target nozzle hole according to the blockage rate prediction value corresponding to each target nozzle hole, and control the positive pressure pump to dredge each target nozzle hole according to the positive dredging pressure corresponding to each target nozzle hole.

8. The printing system of the inkjet printer according to claim 4 or 5, characterized in that: The print head is used to control the negative pressure pump to absorb ink, and the target nozzle hole is unblocked by the ink absorption pressure of the negative pressure pump.

9. The printing system of the inkjet printer according to claim 8, characterized in that: The print head is used to determine the negative pressure dredging pressure of each target nozzle hole according to the blockage rate prediction value corresponding to each target nozzle hole, and control the negative pressure pump to dredge each target nozzle hole according to the negative pressure dredging pressure corresponding to each target nozzle hole.

10. A printing method for an inkjet printer, characterized in that: A printing system applied to an inkjet printer according to any one of claims 1 to 9, the method comprising: The inkjet information generation module generates target inkjet information corresponding to each nozzle according to the historical inkjet information of the print head, wherein the target inkjet information includes multiple groups of inkjet data, each group of the inkjet data includes the current inkjet amount and the inkjet time and ink type corresponding to the current inkjet amount, wherein different groups of inkjet data correspond to different inkjet times; The blocked nozzle orifice determination module uses a pre-trained nozzle orifice blockage prediction model to determine the target nozzle orifice that needs to be unblocked according to the target inkjet information, and the nozzle orifice blockage prediction model is an autoregressive moving average model; The dredging instruction generation module generates a dredging instruction corresponding to the target nozzle hole, and sends the dredging instruction to the print head; The print head dredges the target nozzle hole according to the dredging instruction.

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