An ink path control method for a high-viscosity metal white ink printing apparatus

Abstract

The application relates to the field of printing equipment and discloses an ink path control method of high-viscosity metal white ink printing equipment, which is used for controlling the printing equipment. The method comprises the following steps: obtaining a real-time circulating flow of ink to obtain a feedforward compensation amount, dynamically adjusting a negative pressure control parameter in combination with a real-time ink path pressure deviation and a target pressure deviation to establish a stable negative pressure environment; determining circulating flow and degassing vacuum degree set values based on ink types and equipment working conditions, controlling a circulating pump and monitoring ink temperature and viscosity according to the set values, and dynamically correcting the set values and heating power; and continuously monitoring nozzle states, and starting an accurate metering cleaning program when the performance of the nozzle is reduced. According to the method, adjustment coefficients are inquired according to ink types and working conditions, temperature and viscosity correction amounts are comprehensively processed, and the like, so that accurate ink path control is realized, and the printing quality and stable operation of the equipment are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of printing equipment, and more particularly to an ink path control method for a high-viscosity metallic white ink printing device. Background Technology

[0002] In the industrial printing field, high-viscosity metallic white inks are widely used in high-end manufacturing, electronic circuit printing, decorative arts, and other fields due to their unique physical and chemical properties. These inks typically have high viscosity and special metallic components, placing extremely high demands on the ink path control of the equipment during the printing process. High-viscosity inks are easily affected by various factors such as temperature, pressure, and viscosity during circulation, jetting, and curing, leading to problems such as unstable print quality, nozzle clogging, and insufficient ink degassing. These problems not only affect printing efficiency but may also cause equipment malfunctions and increase maintenance costs.

[0003] Traditional ink path control methods often use fixed parameter settings, which are difficult to adapt to different ink types and complex and ever-changing printing conditions.

[0004] A fixed circulation flow rate may cause the ink to remain in the ink path for too long or too short a time, affecting the uniformity of the ink and the degassing effect; a single pressure control strategy cannot effectively cope with pressure fluctuations caused by changes in ink viscosity, resulting in unstable nozzle ejection; the lack of real-time monitoring and dynamic adjustment of ink temperature and viscosity makes the ink prone to deviating from its optimal working state due to environmental changes during the printing process.

[0005] Traditional methods also have shortcomings in nozzle cleaning and solvent replenishment. They often use global cleaning or fixed amount of solvent replenishment, which cannot be precisely controlled for specific nozzles or ink conditions, resulting in resource waste and reduced print quality.

[0006] Therefore, we propose an ink path control method for a high-viscosity metallic white ink printing device to solve the above problems. Summary of the Invention

[0007] This invention provides an ink path control method for a high-viscosity metallic white ink printing device, used for controlling the printing device.

[0008] The first aspect of the present invention provides an ink path control method for a high-viscosity metallic white ink printing device, the ink path control method for the high-viscosity metallic white ink printing device comprising: acquiring the real-time circulation flow rate of ink in the ink path system, and obtaining a feedforward compensation amount based on the real-time circulation flow rate; Based on the deviation between the real-time pressure of the ink path and the target pressure, combined with the feedforward compensation amount, the negative pressure control parameters are dynamically adjusted to output a negative pressure adjustment command. Based on the identified ink type and the current operating condition of the equipment, determine the corresponding circulation flow rate setting and degassing vacuum setting. The circulation pump is controlled to operate according to the circulation flow rate setting value, and the real-time temperature and viscosity of the ink are monitored. The degassing vacuum setting value and heating power are adjusted according to the monitoring results. When the status parameters of any nozzle indicate a decline in its performance, a metering cleaning procedure is initiated for that nozzle.

[0009] Optionally, in a first implementation of the first aspect of the present invention, the method includes: comparing real-time collected ink path pressure data with a preset target pressure value to obtain a real-time pressure deviation value; querying a predefined control parameter adjustment rule library based on the pressure deviation value and its changing trend over time, and outputting proportional, integral, and derivative control parameters; using the dynamically adjusted control parameters to calculate the pressure deviation value to obtain a pressure adjustment amount; and superimposing the pressure adjustment amount with the feedforward compensation amount to obtain a negative pressure adjustment command.

[0010] Optionally, in a second implementation of the first aspect of the present invention, the method includes: receiving ink characteristic signals and device operating status signals reported by device sensors; outputting an identifier of the currently used ink type and an identifier of the current operating mode of the device based on predefined feature matching rules; querying a pre-stored ink basic parameter table according to the ink type identifier to obtain a basic circulation flow rate value and a basic degassing vacuum value corresponding to the ink type; querying a predefined operating condition-parameter mapping relationship according to the operating mode identifier to obtain an operating condition adjustment coefficient; and obtaining a circulation flow rate setting value and a degassing vacuum setting value based on the basic circulation flow rate value and the basic degassing vacuum value and the corresponding operating condition adjustment coefficient, respectively.

[0011] Optionally, in a third implementation of the first aspect of the present invention, the method includes: acquiring a device operating status signal, the device operating status signal including at least the current moving speed of the printhead and ambient temperature data; obtaining a specific device operating condition sub-mode identifier based on the current moving speed of the printhead and ambient temperature data, combined with a predefined operating condition judgment logic; combining the device operating condition sub-mode identifier with the ink type identifier to form a combined operating condition index; and querying a pre-stored composite mapping relationship table based on the combined operating condition index to directly output the corresponding operating condition adjustment coefficient.

[0012] Optionally, in a fourth implementation of the first aspect of the present invention, the pre-stored composite mapping table includes a dynamic adjustment strategy for high-viscosity fluids. When querying the pre-stored composite mapping table based on the combined operating condition index, if a matching dynamic adjustment strategy for a corresponding high-viscosity fluid is found, then the strategy used to update the proportional gain is extracted. and differential gain The parameters are used to overcome the viscous damping of high-viscosity fluids under pressure transients; And calculate the initial pressure adjustment based on the updated parameters. : ; in, For pressure deviation, The trend of deviation change This is a preset high-viscosity nonlinear amplification factor. This is the currently measured viscosity. This is the factory standard viscosity.

[0013] Optionally, in a fifth implementation of the first aspect of the present invention, the method includes: real-time acquisition of temperature data of ink in the ink path and measurement data of an online viscometer to obtain real-time temperature and viscosity values ​​of the ink; comparison of the real-time temperature value with a preset target temperature value, obtaining a first correction amount based on the deviation, and obtaining a second correction amount using the deviation between the real-time viscosity value and the target viscosity value; processing the first correction amount and the second correction amount to output a compensation correction amount for the degassing vacuum setting value and a power adjustment amount for the heating device; combining the degassing vacuum setting value with the compensation correction amount to form a corrected degassing vacuum control command, and obtaining a heating control command based on the power adjustment amount.

[0014] Optionally, in a sixth implementation of the first aspect of the present invention, the method includes: acquiring current ink type information and current operating condition information of the device; querying a pre-stored comprehensive processing strategy mapping table to obtain processing weight coefficients based on the ink type information and operating condition information; using the processing weight coefficients to perform weighted fusion of the first correction amount and the second correction amount to obtain a comprehensive state deviation amount; and inputting the comprehensive state deviation amount into a predefined control amount to obtain a rule set and outputting the compensation correction amount and the power adjustment amount in parallel.

[0015] Optionally, in the seventh implementation of the first aspect of the present invention, the method includes: real-time acquisition of the state parameters of each nozzle to obtain state parameter data reflecting the current working state of the nozzle; comparison of the state parameter data with a preset performance threshold mapping table for different ink types, and outputting a performance degradation judgment result for each nozzle; when the performance degradation judgment result indicates that the nozzle meets a preset triggering condition, a fixed-point cleaning command is obtained; according to the fixed-point cleaning command, the corresponding fluid control valve and metering pump are controlled to work together to apply a predetermined volume of cleaning liquid pulse to the local flow path where the nozzle is located.

[0016] Optionally, in the eighth implementation of the first aspect of the present invention, the method further includes: continuously acquiring ink viscosity data measured by an online viscometer and ink temperature data measured by a temperature sensor, and combining this with ink type information to obtain comprehensive ink state parameters; determining a solvent replenishment amount matching the current state from a predefined viscosity-temperature-solvent compensation amount mapping table based on the comprehensive state parameters; obtaining a solvent replenishment command based on the solvent replenishment amount, and controlling a metering pump to inject a corresponding volume of replenishing solvent into a designated location in the ink path system; after completing the solvent replenishment, acquiring the ink viscosity and temperature data again after a preset mixing time, and evaluating whether the replenished ink state has recovered to the target range.

[0017] Optionally, in the ninth implementation of the first aspect of the present invention, the method includes: based on the ink temperature value and the measured viscosity value in the comprehensive state parameters, combined with the currently identified ink type, querying a pre-stored viscosity reference curve to obtain the theoretical standard viscosity value corresponding to the current temperature; calculating the deviation between the measured viscosity value and the theoretical standard viscosity value to obtain a viscosity deviation value; inputting the viscosity deviation value into a preset compensation amount calculation rule set to output a basic replenishment volume; obtaining a time decay correction coefficient from a predefined decay coefficient table according to the ink type and the current cumulative operating time of the device; and obtaining the solvent replenishment amount based on the basic replenishment volume and the time decay correction coefficient.

[0018] The mechanism of this invention is as follows: the feedforward compensation amount is obtained based on the rate of change of real-time circulating flow, and it is integrated with the closed-loop regulation of pressure deviation to realize dynamic feedforward-feedback composite control of negative pressure environment and eliminate the influence of flow disturbance on ink path stability. Beneficial effects: By monitoring changes in ink circulation flow in real time to obtain feedforward compensation, this method is integrated into the negative pressure regulation process. Unlike traditional control methods that rely solely on feedback, it can respond to flow fluctuations in advance, adjust negative pressure more quickly and accurately, effectively avoid pressure instability caused by flow changes, establish a highly stable working negative pressure environment for the printing process, and significantly improve the consistency and stability of print quality. Based on the real-time pressure deviation and its changing trend, and combined with a dedicated adjustment strategy for ink type query, the proportional, integral, and derivative control parameters are dynamically updated, enabling the negative pressure control to better adapt to different ink characteristics and further enhancing the system's adaptability to complex working conditions. Based on the identified ink type and equipment operating conditions, the system determines the set values ​​for circulation flow rate and degassing vacuum degree through multi-level queries and calculations. It fully considers the differentiated requirements of different inks and operating conditions for printing parameters, achieving intelligent and precise parameter settings to ensure that the ink is in optimal printing condition under various conditions. Continuously monitor ink temperature and viscosity, dynamically adjust the degassing vacuum setting and heating power based on the monitoring results, respond promptly to changes in ink state, maintain the target ink viscosity and degassing state, and avoid printing defects caused by ink performance fluctuations, such as clogging and uneven color. The system continuously monitors the operating parameters of each nozzle, and when a nozzle's performance deteriorates, it initiates a precise metering cleaning program for that nozzle. Compared to traditional overall cleaning methods, this approach can accurately locate problematic nozzles, reduce the amount of cleaning fluid used and cleaning time, minimize the impact on normal nozzles, effectively extend nozzle lifespan, and reduce equipment maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the ink path control method for a high-viscosity metallic white ink printing device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of another embodiment of the ink path control method for a high-viscosity metallic white ink printing device according to the present invention; Figure 3 This is a schematic diagram illustrating the real-time circulation flow monitoring process of ink in the ink path system in an embodiment of the present invention. Detailed Implementation

[0020] This invention provides an ink path control method for a high-viscosity metallic white ink printing device, used for controlling the printing device. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0021] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the ink path control method for a high-viscosity metallic white ink printing device according to the present invention includes: 101. Obtain the real-time circulation flow rate of ink in the ink path system, and obtain the feedforward compensation amount based on the change in this flow rate.

[0022] It is understood that the executing entity of this invention can be the ink path control device of a high-viscosity metallic white ink printing device, or it can be a terminal or a server; the specific implementation is not limited here. This embodiment of the invention will be described using a server as an example.

[0023] It should be noted that the main ink supply line of the printing equipment is equipped with a high-precision micro Coriolis mass flow meter specifically designed for high-viscosity fluids. The server continuously reads the feedback values ​​from this flow meter at a sampling frequency of 50Hz (i.e., once every 20ms). When the equipment is in a stable standby micro-circulation state, the real-time circulation flow rate of this high-viscosity metallic white ink is stable at 150ml / min.

[0024] When the printer suddenly receives a print command for a large solid pattern and begins high-frequency inkjet printing, a large amount of ink is consumed by the nozzles. This disrupts the original circulation balance, causing a transient drop in ink flow in the return pipeline. By comparing data from several consecutive sampling periods, the server accurately detected that the real-time circulation flow rate rapidly dropped from 150 ml / min to 120 ml / min within 100 ms. The server then determined that the current flow rate fluctuation difference was -30 ml / min. Since the absolute value of this value exceeded the system's set daily fluctuation masking dead zone, the system determined that a feedforward mechanism must be activated.

[0025] High-viscosity metallic white ink flows through pipelines with high frictional resistance, calculated according to the Hagen-Poiseuille formula. A sudden drop in circulation flow rate reduces dynamic pressure friction loss within the pipeline, causing the negative pressure in the nozzle cavity to drift towards positive pressure. To prevent this trend, the server immediately calls the flow rate change to pressure compensation empirical mapping table. According to previous calibration, every 10 ml / min decrease in circulation flow rate leads to a 0.05 kPa reduction in negative pressure at the printhead. For the current decrease of 30 ml / min, the system calculates a risk of 0.15 kPa of negative pressure loss in the ink path.

[0026] The estimated physical deviation of 0.15 kPa is converted into an electrical control signal. The control gain of the negative pressure proportional valve is set to 1000 mV voltage for every 1 kPa of air pressure, and a feedforward compensation voltage increment of 150 mV is calculated and obtained.

[0027] 102. Based on the deviation between the real-time pressure and the target pressure of the ink path, and in conjunction with the feedforward compensation, the negative pressure control parameters are dynamically adjusted to output a negative pressure adjustment command, thereby establishing a stable working negative pressure environment.

[0028] It should be noted that, to ensure no dripping occurs at the nozzle meniscus and to smoothly draw in high-density ink droplets, the server presets the target operating negative pressure at the printhead end to be -3.50 kPa. At the same moment a large-area printing task starts and the pipeline flow begins to drop sharply, the high-precision pressure sensor reports a real-time pipeline negative pressure of -3.45 kPa. The server compares this and determines there is a negative pressure deficiency of 0.05 kPa. The built-in proportional-integral-derivative (PID) control logic module quickly intervenes, calculating a basic feedback control voltage of 50 mV to eliminate this actual deviation.

[0029] Relying solely on basic feedback control can easily lead to adjustment lag in the system. Therefore, the server directly extracts the 150mV feedforward compensation obtained in step 101 due to the sudden drop in circulating flow. The server then integrates the 50mV basic feedback voltage, representing the response to known deviations, with the 150mV feedforward compensation voltage, representing the prevention of future fluctuations, to obtain a total dynamic adjustment command increment of 200mV.

[0030] Updated control commands were issued to the high-frequency proportional valve responsible for regulating the negative pressure pneumatic circuit. The base drive voltage for maintaining the proportional valve's standby micro-circulation state was set to 3500mV. The server directly added the aforementioned 200mV increment, instantly outputting a drive voltage of 3700mV to the proportional valve. Upon receiving the signal, the proportional valve increased its opening, enhancing the vacuum suction effect of the pump. This action not only quickly corrected the minor pressure drift that had already occurred but also proactively established an additional negative pressure buffer in the pipeline, effectively offsetting the sudden pressure drop impact transmitted in the pipeline due to the sharp decrease in flow rate, successfully maintaining a stable operating negative pressure environment of -3.50kPa.

[0031] 103. Based on the identified ink type and the current operating condition of the equipment, determine the corresponding circulation flow rate setting and degassing vacuum setting.

[0032] It should be noted that the ink supply control board accurately identifies the currently loaded ink cartridge as high-viscosity metallic titanium dioxide white ink by reading the RFID tag on the cartridge. The system clearly recognizes that this metallic white ink has rapid settling characteristics calculated according to Stokes' sedimentation formula, and that its high-viscosity matrix easily traps air to form microbubbles when subjected to shear force. The equipment is rapidly switching to high-frequency solid printing mode, with the current inkjet duty cycle reaching 85%, and the ignition drive frequency of the piezoelectric nozzles has been increased to 30,000 Hz.

[0033] The set circulation flow rate in standby mode is 150 ml / min. However, under the current high-frequency full-load conditions, maintaining the original flow rate would lead to insufficient ink supply and easy particle accumulation in dead corners. Based on the built-in mapping table, the server automatically increases the target circulation flow rate setting significantly and locks it at 280 ml / min, aiming to use high flow rate kinetic energy to thoroughly flush the pipeline and break the sedimentation trend of heavy metal particles.

[0034] The vacuum level of the degassing module must be matched to the ink viscosity and pipeline flow rate. When high-viscosity white ink circulates at a high speed of 280 ml / min and vibrates violently within the printhead, a large amount of dissolved gas will be aroused. The original standby degassing vacuum level was -50 kPa. Given the current doubled flow rate and increased bubble formation, the server automatically lowers and deepens the degassing vacuum setting to -75 kPa. This creates a stronger pressure difference across the degassing membrane, causing the encapsulated microbubbles to precipitate out through the increased negative pressure.

[0035] 104. Control the operation of the circulating pump according to the circulating flow rate setting value, and monitor the real-time temperature and viscosity of the ink. Dynamically adjust the degassing vacuum setting value and heating power according to the monitoring results to maintain the ink at the target viscosity and degassing state.

[0036] It should be noted that after receiving the flow rate setpoint of 280 ml / min, the server sends a command to the brushless diaphragm pump in the main circulation loop, precisely locking the actual flow rate within the ink path at 280 ml / min. High-viscosity metallic white ink is extremely sensitive to temperature; the optimal operating temperature at the end is set at 45℃, corresponding to a target dynamic viscosity of 12 mPa·s. When the flow rate instantly doubles, a large amount of 25℃ room-temperature cold ink from the main ink tank surges into the secondary buffer ink cartridge. The online tuning fork viscometer and thermistor detect the cold shock phenomenon: the ink's real-time temperature drops to 38℃, and the viscosity rapidly rises to 16 mPa·s.

[0037] High viscosity leads to a significant increase in resistance when squeezing ink droplets. The server's temperature control module immediately intervenes, dynamically adjusting and increasing the power of the polyimide heating film outside the secondary ink cartridge from 50W in standby mode to 120W at full load to quickly heat and compensate for the cold ink.

[0038] During the tens of seconds of waiting for the temperature to rise, the system determined that the current high viscosity state increased the binding force on the microbubbles, and the -75kPa degassing vacuum was insufficient to tear the bubbles apart. The server triggered a linkage correction mechanism, dynamically correcting the degassing vacuum setting to the extreme state of -85kPa, using this additional negative pressure to overcome the bubble escape resistance caused by the low temperature and high viscosity.

[0039] After about 15 seconds of high-power heating, the ink temperature rises again and stabilizes at 45°C, and the viscosity drops back to the target state of 12 mPa·s. A closed-loop adjustment is then performed, reducing the heating power to a steady-state value of 80W to accommodate high flow rates, and safely adjusting the degassing vacuum to -75 kPa to ensure fluid stability.

[0040] 105. Continuously monitor the working status parameters of each nozzle. When the status parameters of any nozzle indicate a decline in performance, initiate a precise metering cleaning program for that nozzle.

[0041] It should be noted that a high-speed laser gated scanning array is integrated into the flight path below the printhead. During printing, the server performs real-time monitoring of the ink droplets ejected from the 1024 nozzles within the printhead, focusing on the average flight speed and ejection trajectory deflection angle of the droplets. Taking nozzle N-0512 as an example, the standard healthy initial velocity of this printhead should be maintained at approximately 6.5 m / s, and the safe deflection angle should be less than 1.0°. The system detected that the current flight speed of N-0512 has dropped to 4.8 m / s, and the deflection angle has reached 1.8°.

[0042] After quantitative evaluation, it was determined that nozzle N-0512 was in a semi-clogged state with degraded performance. In order not to damage the image on the current substrate, the system did not immediately interrupt the overall printing, but instead temporarily blocked the ignition signal of nozzle N-0512 in the print control data stream and simultaneously activated its adjacent nozzles to perform image compensation algorithm (Nozzle Compensation) to maintain the integrity of the output image.

[0043] When the current print scan return cycle ends and the printhead moves above the flash nozzle in a non-printing area, the server quickly initiates a precise electrical signal pulse cleaning program for the N-0512. Instead of sending the normal print waveform, the main control board sends a dedicated set of high-frequency, high-amplitude, high-force purge waveforms to the piezoelectric ceramic at the bottom of the N-0512. This waveform drives the piezoelectric crystal to vibrate violently, instantly extruding approximately 5000 high-energy, large ink droplets (total volume approximately 200 nmol). Utilizing the ultrasonic-level kinetic energy of the fluid itself, it breaks down and peels away the titanium dioxide clumps adhering to the micron-sized pore edges.

[0044] The following table 1 shows an example of a comparison of monitoring data and a status assessment: Table 1 N-0128 6.6 0.2 normal Maintain regular printing N-0512 4.8 1.8 Performance degradation (partial blockage) Initiate image compensation and perform powerful expulsion waveform cleaning in the flash spray area. N-0896 6.4 0.3 normal Maintain regular printing N-1024 6.5 0.1 normal Maintain regular printing After cleaning, the server retested the nozzle using the scanning array. Data showed that the nozzle's flight speed had recovered to 6.4 m / s, and the deflection angle had been corrected to 0.2°. The server then marked the nozzle as repaired, decompensated adjacent nozzles, and restored overall production output.

[0045] Please see Figure 2 and Figure 3 Another embodiment of the ink path control method for a high-viscosity metallic white ink printing device in this invention includes: 201. Obtain the real-time circulation flow rate of ink in the ink path system, and obtain the feedforward compensation amount based on the change in this flow rate.

[0046] Specifically, the ink flow rate downstream of the circulating pump in the ink path system is monitored in real time to obtain real-time flow data; the rate of change of the real-time flow data relative to the previous time period is calculated to obtain a flow rate change value; the flow rate change value is input into a preset compensation coefficient mapping table, which associates different ink types with corresponding compensation coefficients, and outputs a specific compensation coefficient that matches the current ink type; the flow rate change value and the specific compensation coefficient are calculated to obtain the feedforward compensation amount.

[0047] It should be noted that in the ink supply loop of the printing equipment, a high-frequency response micro-mass flow meter is installed on the physical pipeline downstream of the main circulation pump in the control system. The control unit continuously monitors the dynamics of the ink flowing through this pipeline with a fixed time sampling period of 100ms. For example, at the instant the equipment suddenly switches from standby mode to a high-density inkjet printing task, the real-time ink flow rate recorded by the system in the previous time period is 200ml / min; while in the current sampling period, the real-time flow rate reported by the flow meter has rapidly dropped to 180ml / min.

[0048] Upon receiving flow rate data from two adjacent time periods, the control unit immediately performs a quantitative assessment of the fluid trend. The system comparison reveals that the absolute flow rate in the current period has decreased by 20 ml / min compared to the previous period, resulting in a flow rate difference of -20 ml / min between adjacent periods. This difference directly reflects the severity of the sudden drop in flow velocity within the pipeline.

[0049] Because different fluids generate drastically different frictional resistances and hysteresis effects in pipelines, the control unit identifies the current pipeline as containing high-density titanium dioxide-based high-viscosity metallic white ink via the ink cartridge chip. The system then calls a preset compensation coefficient mapping table and finds that this specific type of white ink is prone to severe negative pressure hysteresis when the flow rate decreases sharply. Therefore, the mapping table outputs a matching specific compensation coefficient: -8mV / (ml / min).

[0050] After synchronously acquiring transient and static fluid property parameters, the control unit multiplies the -20 and -8 values ​​representing the flow difference. Using the logic that a negative multiplier equals a positive multiplier, a positive electrical control increment is calculated. This 160mV value is the feedforward compensation amount under the current operating condition. Before the pressure sensor detects a substantial drop, the system has already calculated the required additional 160mV drive voltage using the flow rate change.

[0051] 202. Based on the deviation between the real-time pressure and the target pressure of the ink path, and in conjunction with the feedforward compensation, the negative pressure control parameters are dynamically adjusted to output a negative pressure adjustment command, thereby establishing a stable working negative pressure environment.

[0052] Specifically, a real-time pressure deviation value is obtained by comparing the real-time collected ink pressure data with the preset target pressure value; based on the pressure deviation value and its trend over time, a predefined control parameter adjustment rule library is queried, and a set of dynamically adjusted proportional, integral, and derivative control parameters are output; using the dynamically adjusted control parameters, the pressure deviation value is calculated to obtain a preliminary pressure adjustment amount; the preliminary pressure adjustment amount is superimposed with the feedforward compensation amount to obtain a negative pressure adjustment command; and the negative pressure adjustment command is sent to the negative pressure adjustment device.

[0053] Furthermore, the specific type of high-viscosity ink currently being used in the ink path system is identified to obtain an ink type identifier; based on the ink type identifier, a dedicated adjustment strategy matching that type of ink is called from the pre-stored parameter adjustment strategy library; taking the pressure deviation value and its changing trend as input, the dedicated adjustment strategy is applied to calculate and output a control parameter adjustment instruction specifically for the current ink type; based on the control parameter adjustment instruction, the proportional, integral, and derivative control parameters used to obtain the initial pressure adjustment amount are updated.

[0054] It should be noted that during high-density inkjet printing, the server continuously reads data from the high-precision pressure sensor. The system's preset ideal target working negative pressure is -3.50 kPa. In the current sampling period, when the flow rate changes abruptly, the sensor reports a real-time ink path pressure of -3.42 kPa. The system compares this to determine the current real-time pressure deviation. The pressure is 0.08 kPa (meaning negative pressure is being lost). Simultaneously, by comparing with historical periodic data, the system calculates the rate of change of this pressure deviation over time. The value is 0.05 kPa / s, indicating that the negative pressure loss is accelerating.

[0055] The RF chip identifies the current ink type as HW-Titanium-01. Based on this identifier, the system retrieves a matching high-viscosity-specific adjustment strategy from the strategy library. The strategy indicates that high-viscosity fluids exhibit high viscosity damping during pressure transients, and conventional fixed parameters will cause hysteresis. Based on a deviation of 0.08 kPa, an acceleration drift trend of 0.05 kPa / s, and the specific strategy, the system updates the parameters: adjusting the proportional gain... Dynamically amplified to 1500mV / kPa, differential gain Increase to 200 mV·s / kPa. Calculate the initial pressure adjustment: ; in, This represents the initial pressure regulation (mV). The first part in parentheses is the classical proportional-derivative control term: mV, plus The total basic feedback requirement is 130mV. The second part in parentheses is the high-viscosity nonlinear amplification factor. Take 0.15; Current measured viscosity 14 mPa·s; factory standard viscosity The value is 10 mPa·s. After high-precision calculation: The initial pressure adjustment amount is obtained. mV, the system truncates and rounds to 137mV.

[0056] The initial adjustment of 137mV, representing the correction of the actual deviation, is added to the 160mV feedforward compensation for the anticipated future impact in step 201, resulting in a total command increment of 297mV. This command is superimposed on the proportional valve's base voltage of 3500mV, causing it to open rapidly with a transient high voltage of 3797mV. This suction action restores the negative pressure and maintains it at -3.50kPa before the pressure drops.

[0057] 203. Based on the identified ink type and the current operating condition of the equipment, determine the corresponding circulation flow rate setting and degassing vacuum setting.

[0058] Specifically, the system receives ink characteristic signals and equipment operating status signals reported by the device sensors. Based on predefined feature matching rules, it outputs the currently used ink type identifier and the current operating mode identifier of the device. According to the ink type identifier, it queries the pre-stored ink basic parameter table to obtain the basic circulation flow rate value and basic degassing vacuum value corresponding to that type of ink. According to the operating mode identifier, it queries the predefined operating condition-parameter mapping relationship to obtain a set of operating condition adjustment coefficients used to correct the basic values. The basic circulation flow rate value and basic degassing vacuum value are combined with the corresponding operating condition adjustment coefficients to obtain the circulation flow rate set value and the degassing vacuum set value.

[0059] Furthermore, the device operating status signal is acquired, which includes at least the current printhead movement speed and ambient temperature data. Based on the current printhead movement speed and ambient temperature data, and combined with predefined operating condition judgment logic, a specific device operating condition sub-mode identifier is obtained. The device operating condition sub-mode identifier is combined with the ink type identifier to form a combined operating condition index. Based on the combined operating condition index, a pre-stored composite mapping relationship table is queried, and the corresponding set of operating condition adjustment coefficients is directly output.

[0060] It should be noted that the ink supply control board reads the ink cartridge chip and identifies the current ink as HW-Titanium-01 (high specific gravity titanium dioxide metallic white ink). The control system accesses the underlying basic parameter table and obtains the basic circulation flow rate of this ink under micro-circulation state as 150ml / min and the basic degassing vacuum degree as -40kPa.

[0061] The system processes dynamic operating status signals reported by the device's sensors in real time and in parallel. For the current solid inkjet printing task, the encoder reports that the printhead's current physical movement speed has reached 1.2 m / s; the temperature sensor measures the ambient temperature to be 28℃. The system substitutes these two key dynamic data points into a predefined operating condition judgment logic tree. Due to the extremely high speed and slightly high ambient temperature, the device operating condition sub-mode is identified as high-speed - hot operating condition (internal identification code HSW-03).

[0062] The ink type identifier is seamlessly combined with the device operating condition sub-mode identifier to form a unique combined operating condition index: HW-Ti-01-HSW-03. Based on this index, the system accurately addresses the data in a pre-stored composite mapping table. The mapping table directly outputs the operating condition adjustment coefficients for this composite scenario: the circulation flow rate adjustment coefficient is 1.6; the degassing vacuum degree adjustment coefficient is 1.5.

[0063] By combining the baseline circulation flow rate (150 ml / min) with the flow rate adjustment factor (1.6), a new circulation flow rate setting of 240 ml / min was calculated. This flow rate is designed to compensate for high-frequency consumption and flush out sediment in the pipeline. Simultaneously, the system combines the baseline degassing vacuum value (-40 kPa) with the vacuum adjustment factor (1.5) to calculate a new degassing vacuum setting of -60 kPa. This 50% increase in vacuum negative pressure is specifically designed to combat the large number of microbubbles generated under high-speed reciprocating oscillations.

[0064] 204. Control the operation of the circulating pump according to the circulating flow rate setting value, and monitor the real-time temperature and viscosity of the ink. Dynamically adjust the degassing vacuum setting value and heating power according to the monitoring results to maintain the ink at the target viscosity and degassing state.

[0065] Specifically, the circulating flow rate setpoint is converted into a control signal to drive the circulating pump; real-time temperature data of the ink in the ink path and measurement data from the online viscometer are collected to obtain the real-time temperature and viscosity values ​​of the ink; the real-time temperature value is compared with the preset target temperature value, and a first correction amount is obtained based on the deviation, and a second correction amount is obtained using the deviation between the real-time viscosity value and the target viscosity value; the first and second correction amounts are combined to output a compensation correction amount for the degassing vacuum setpoint and a power adjustment amount for the heating device; the degassing vacuum setpoint and the compensation correction amount are combined to form a corrected degassing vacuum control command; simultaneously, a heating control command is obtained based on the power adjustment amount; the corrected degassing vacuum control command and the heating control command are sent to the degassing device and the heating device, respectively.

[0066] Furthermore, obtain the current ink type information and the current operating condition information of the device; based on the ink type information and operating condition information, query a pre-stored comprehensive processing strategy mapping table to obtain a set of processing weight coefficients that match the current type and operating condition; use the processing weight coefficients to perform weighted fusion calculation on the first correction amount and the second correction amount to obtain the comprehensive state deviation amount. The comprehensive state deviation is input into a predefined control quantity to obtain a rule set. This rule set specifies the degassing vacuum compensation and heating power change corresponding to different deviation ranges, and outputs the compensation correction and power adjustment in parallel.

[0067] It should be noted that the flow rate setpoint of 240 ml / min is converted into a PWM signal with a duty cycle of 65% to drive the main ink path diaphragm pump. A large amount of room temperature cold ink at 25°C flows rapidly into the secondary ink cartridge. After encountering a cold shock, the thermistor and the online tuning fork viscometer detect that the real-time ink temperature drops from 45°C to 39°C; the real-time viscosity of the high-viscosity white ink clumps up from 12 mPa·s and climbs to 15 mPa·s.

[0068] The system has a built-in optimal benchmark: target temperature 45℃, target viscosity 12mPa·s. The control unit calculates the deviation: comparing 39℃ with 45℃, a first correction value of 6 is obtained; comparing 15mPa·s with 12mPa·s, a second correction value of 3 is obtained.

[0069] Combining information on high-density metallic white ink and high-speed, high-temperature operating conditions, the system queries the comprehensive processing strategy mapping table. The system determines that the hazard of viscosity surge locking up internal microbubbles has a higher priority than pure temperature deviation. The system extracts processing weight coefficients: assigning a low weight of 0.3 to the first correction (temperature) and a high weight of 0.7 to the second correction (viscosity). A weighted fusion calculation is then performed. The resulting comprehensive state deviation is 3.9.

[0070] The comprehensive state deviation of 3.9 is input into the control quantity to obtain the rule set. The rule set determines that the current situation is in the range of high bubble retention and moderate temperature loss risk, and outputs the action allowance in parallel: the degassing vacuum degree compensation correction is -10kPa, and the heating power adjustment is +40W.

[0071] The command receiving unit combines a base vacuum of -60 kPa with a compensation of -10 kPa to generate a corrected degassing command of -70 kPa; it also combines a base power of 60 W with +40 W to generate a 100 W ultimate heating control command. High-power heating rapidly breaks down caking, while the high vacuum removes microbubbles. After a preset time, the ink state recovers and remains within the target setting range.

[0072] 205. Continuously monitor the working status parameters of each nozzle. When the status parameter of any nozzle indicates a decline in its performance, initiate a precise metering cleaning program for that nozzle.

[0073] Specifically, the status parameters of each nozzle are collected in real time by sensors to obtain status parameter data reflecting the current working state of the nozzle; the status parameter data is compared with a preset performance threshold mapping table for different ink types to output a performance degradation judgment result for each nozzle; when the performance degradation judgment result indicates that the nozzle meets the preset triggering conditions, a fixed-point cleaning command containing the nozzle identifier and corresponding cleaning pulse sequence parameters is obtained; according to the fixed-point cleaning command, the corresponding fluid control valve and metering pump are controlled to work together to apply a predetermined volume of cleaning fluid pulse to the local flow path where the nozzle is located.

[0074] It should be noted that the micro-laser stroboscopic velocity measurement component is activated for real-time inspection, which samples the flight dynamics of the tiny ink droplets ejected from each nozzle and outputs two core parameters in real time: the initial velocity of the ink droplet and the ejection deflection angle.

[0075] The data was compared with a performance threshold mapping table specifically preset for HW-Titanium-01. The standard initial velocity should be 6.5 m / s; a velocity decrease to below 5.0 m / s or a deflection angle greater than 1.5° is considered a performance degradation. The system detected nozzle 088 (N-Z2-088) in the second physical ink supply zone, whose initial velocity had dropped to 4.2 m / s and whose deflection angle reached 1.9°. The system determined that this met the preset cleaning trigger conditions.

[0076] The instruction parsing revealed that N-Z2-088 belongs to the second ink supply zone of the printhead (covering a local flow path of 256 nozzles). Based on the characteristics of high-viscosity white ink and strictly adhering to the safety pressure-bearing specifications of microelectromechanical systems (MEMS), the system was matched with a set of flexible cleaning pulse sequence parameters: the micro-pressure injection pressure of the cleaning fluid was set to 0.04 MPa, and the pulse execution time was 2 seconds.

[0077] As the printing carriage moves above the waste ink tank, the microfluidic control valve assembly quickly cuts off the normal ink supply to the second zone and independently connects it to the high-frequency stepper metering pump. Following a pre-set sequence, the metering pump slowly and evenly applies a pulse of cleaning fluid, precisely controlled at a volume of 0.15 ml, to the second zone's flow path with a gentle positive pressure of 0.04 MPa over 2 seconds. This micro-pressure fluid gently flushes away the buildup on the inner wall, while the nozzles in the other three zones remain completely unaffected.

[0078] The nozzle condition monitoring and evaluation records are shown in Table 2 below: Table 2 N-Z1-125 First Ink Supply Zone 6.4 m / s 0.3° Normal, threshold not reached. No action, maintaining state N-Z2-087 Second Ink Supply Zone 6.2 m / s 0.5° Normal, threshold not reached. Passively participate in the same partition cleaning N-Z2-088 Second Ink Supply Zone 4.2 m / s 1.9° Performance degradation, trigger conditions met Switch valve group and apply 0.15 ml low-pressure pulse cleaning. N-Z4-012 Fourth Ink Supply Zone 6.5 m / s 0.2° Normal, threshold not reached. No action, maintaining state After cleaning, the N-Z2-088 parameters were restored to 6.3 m / s and 0.4°, and the system eliminated the micro-printing fault with minimal consumable cost.

[0079] 206. Continuously acquire ink viscosity data measured by an online viscometer and ink temperature data measured by a temperature sensor, and combine this with ink type information to obtain comprehensive ink state parameters; based on the comprehensive state parameters, determine the solvent replenishment amount matching the current state from a predefined viscosity-temperature-solvent compensation amount mapping table; based on the solvent replenishment amount, obtain a solvent replenishment command and control the metering pump to inject the corresponding volume of replenishment solvent into the designated location in the ink path system; after completing the solvent replenishment, after a preset mixing time, acquire the ink viscosity and temperature data again to evaluate whether the ink state after replenishment has returned to the target range.

[0080] Furthermore, based on the ink temperature and measured viscosity values ​​in the comprehensive state parameters, combined with the currently identified ink type, a pre-stored viscosity reference curve is queried to obtain the theoretical standard viscosity value corresponding to the current temperature; the deviation between the measured viscosity value and the theoretical standard viscosity value is calculated to obtain a viscosity deviation value; the viscosity deviation value is input into a preset compensation calculation rule set, which defines the solvent replenishment amount per unit volume corresponding to different deviation intervals, and a basic replenishment volume is output; according to the ink type and the current cumulative operating time of the equipment, a time decay correction coefficient is obtained from a predefined decay coefficient table; the basic replenishment volume is multiplied by the time decay correction coefficient to calculate the solvent replenishment amount.

[0081] It should be noted that, in response to the irreversible increase in viscosity of high-viscosity inks due to natural solvent evaporation during long-term cycling, a precise automatic addition closed-loop system based on time decay and thermodynamic benchmark compensation has been established.

[0082] After 500 hours of high-load operation, the control unit recorded a real-time temperature of 45°C, while the measured viscosity slowly increased to 14.5 mPa·s. The system then consulted the viscosity reference curve based on the ink type information. The curve indicated that the theoretical standard viscosity of this new ink at 45°C should be 12.0 mPa·s. Subtracting the theoretical value from the measured value yielded a viscosity deviation of +2.5 mPa·s. This deviation confirmed that a trace amount of the core solvent had evaporated.

[0083] Input +2.5 mPa·s into the preset compensation calculation rule set. If this deviation falls within the range of greater than 2.0 and less than 3.0, the rule set directly outputs a basic replenishment volume of 15 ml. Due to the physical aging characteristics of polymer resins during long-term operation, the system, based on the accumulated 500 hours of operation data recorded at the equipment's bottom layer, queries a predefined decay coefficient table to obtain a time decay correction coefficient of 1.2. The system multiplies the basic replenishment volume of 15 ml by the time decay correction coefficient of 1.2 to calculate the target solvent replenishment volume of 18 ml. The solvent replenishment rule mapping and execution status record are shown in Table 3 below: Table 3 Versions 1.0 to 1.9 8 1.2 (Based on 500 hours of operation) not applicable No action yet 2.0 to 2.9 15 1.2 (Based on 500 hours of operation) 18 Restored to version 12.1 (meeting the standard). 3.0 to 3.9 25 1.2 (Based on 500 hours of operation) not applicable No action yet Based on the 18ml result, the control unit receives a solvent replenishment command and drives a high-precision metering pump to slowly inject the diluted solvent into the stirring core area of ​​the main ink tank. After physical injection, the system initiates a 300s mixing and settling time countdown to ensure that the high-viscosity fluid and low-viscosity solvent achieve full homogeneous fusion in the circulation loop. After 5 minutes, the system re-checks the status; the temperature remains locked at 45℃, while the measured viscosity has smoothly dropped back to 12.1 mPa·s, reaching the theoretical baseline. The system assesses that the current state has returned to the target range, and the replenishment task has been successfully closed.

[0084] The present invention also provides an ink path control device for a high-viscosity metallic white ink printing device. The ink path control device for the high-viscosity metallic white ink printing device includes a memory and a processor. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the processor performs the steps of the ink path control method for the high-viscosity metallic white ink printing device in the above embodiments.

[0085] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when the instructions are executed on a computer, cause the computer to perform the steps of the ink path control method of the high-viscosity metallic white ink printing device.

[0086] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0087] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0088] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the ink path of a high-viscosity metallic white ink printing device, characterized in that, include: Obtain the real-time circulation flow rate of ink in the ink path system, and obtain the feedforward compensation amount based on the real-time circulation flow rate; Based on the deviation between the real-time pressure and the target pressure of the ink path, combined with the feedforward compensation amount, the negative pressure control parameters are dynamically adjusted to output a negative pressure adjustment command, including: The real-time pressure deviation value is obtained by comparing the collected ink pressure data with the preset target pressure value. Based on the pressure deviation value and its trend over time, a predefined control parameter adjustment rule library is queried, and a set of dynamically adjusted proportional, integral, and derivative control parameters are output. The pressure deviation value is calculated using the dynamically adjusted control parameters to obtain the pressure adjustment amount. The pressure adjustment amount is superimposed with the feedforward compensation amount to obtain the negative pressure adjustment command. Based on the identified ink type and the current operating condition of the equipment, determine the corresponding circulation flow rate setpoint and degassing vacuum level setpoint, including: The system receives ink characteristic signals and equipment operating status signals reported by the device sensors. Based on predefined feature matching rules, it outputs the currently used ink type identifier and the current operating mode identifier of the device. According to the ink type identifier, it queries a pre-stored ink basic parameter table to obtain the basic circulation flow rate value and basic degassing vacuum value corresponding to that ink type. According to the operating mode identifier, it queries a predefined operating condition-parameter mapping relationship to obtain the operating condition adjustment coefficient. The system combines the basic circulation flow rate value and the basic degassing vacuum value with the corresponding operating condition adjustment coefficient to obtain the circulation flow rate set value and the degassing vacuum set value. The circulation pump is controlled based on the circulation flow rate setpoint, and the real-time temperature and viscosity of the ink are monitored. The degassing vacuum setpoint and heating power are adjusted based on the monitoring results, including: The system collects real-time temperature data of the ink in the ink path and measurement data from an online viscometer to obtain real-time temperature and viscosity values ​​of the ink. It compares the real-time temperature value with a preset target temperature value, obtains a first correction amount based on the deviation, and obtains a second correction amount using the deviation between the real-time viscosity value and the target viscosity value. The system processes the first and second correction amounts to output a compensation correction amount for the degassing vacuum setting value and a power adjustment amount for the heating device, including: Obtain the current ink type information and the current operating condition information of the device; based on the ink type information and operating condition information, query the pre-stored comprehensive processing strategy mapping table to obtain the processing weight coefficient; use the processing weight coefficient to perform weighted fusion of the first correction amount and the second correction amount to obtain the comprehensive state deviation amount; input the comprehensive state deviation amount into the predefined control amount to obtain the rule set and output the compensation correction amount and the power adjustment amount in parallel; The degassing vacuum setting value is combined with the compensation correction amount to form a corrected degassing vacuum control command, and a heating control command is obtained based on the power adjustment amount. When the status parameters of any nozzle indicate a decline in its performance, a metering cleaning procedure is initiated for that nozzle.

2. The ink path control method for a high-viscosity metallic white ink printing device according to claim 1, characterized in that, The step of querying a predefined working condition-parameter mapping relationship based on the working condition mode identifier to obtain the working condition adjustment coefficient includes: Acquire device operating status signals, which include at least the current printhead moving speed and ambient temperature data; Based on the current moving speed of the printhead and the ambient temperature data, a specific equipment operating condition sub-mode identifier is obtained by combining the predefined operating condition judgment logic. The device operating condition sub-mode identifier and the ink type identifier are combined to form a combined operating condition index; The corresponding operating condition adjustment coefficient is directly output by querying the pre-stored composite mapping relationship table based on the combined operating condition index.

3. The ink path control method for a high-viscosity metallic white ink printing device according to claim 2, characterized in that, The pre-stored composite mapping table contains dynamic adjustment strategies for high-viscosity fluids. When querying the pre-stored composite mapping table based on the combined operating condition index, if a matching dynamic adjustment strategy for a corresponding high-viscosity fluid is found, then the strategy used to update the proportional gain is extracted. and differential gain The parameters are used to overcome the viscous damping of high-viscosity fluids under pressure transients; And calculate the initial pressure adjustment based on the updated parameters. : ； in, For pressure deviation, The trend of deviation change This is a preset high-viscosity nonlinear amplification factor. This is the currently measured viscosity. This is the factory standard viscosity.

4. The ink path control method for a high-viscosity metallic white ink printing device according to claim 1, characterized in that, include: Real-time acquisition of status parameters of each nozzle to obtain status parameter data reflecting the current working status of the nozzle; The state parameter data is compared with a preset performance threshold mapping table for different ink types, and the performance degradation judgment result for each nozzle is output. When the performance degradation judgment result indicates that the nozzle meets the preset triggering conditions, a fixed-point cleaning command is obtained; According to the fixed-point cleaning command, the corresponding fluid control valve and metering pump are controlled to work together to apply a predetermined volume of cleaning fluid pulse to the local flow path where the nozzle is located.

5. The ink path control method for a high-viscosity metallic white ink printing device according to claim 1, characterized in that, Also includes: By continuously acquiring ink viscosity data measured by an online viscometer and ink temperature data measured by a temperature sensor, and combining this with ink type information, comprehensive ink state parameters are obtained. Based on the comprehensive state parameters, determine the solvent replenishment amount that matches the current state from a predefined viscosity-temperature-solvent compensation amount mapping table; Based on the solvent replenishment amount, a solvent replenishment command is obtained, and the metering pump is controlled to inject a corresponding volume of replenishing solvent into a designated location in the ink system. After solvent replenishment, the ink viscosity and temperature data are acquired again after a preset mixing time to assess whether the replenished ink has returned to the target range.

6. The ink path control method for a high-viscosity metallic white ink printing device according to claim 5, characterized in that, include: Based on the ink temperature value and measured viscosity value in the comprehensive state parameters, and combined with the currently identified ink type, the pre-stored viscosity reference curve is queried to obtain the theoretical standard viscosity value corresponding to the current temperature. The deviation between the measured viscosity value and the theoretical standard viscosity value is calculated to obtain the viscosity deviation value; The viscosity deviation value is input into a preset compensation calculation rule set to output the basic supplementary volume; Based on the ink type and the current cumulative device operating time, obtain the time decay correction coefficient from the predefined decay coefficient table; The solvent replenishment amount is obtained based on the basic replenishment volume and the time decay correction coefficient.

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