A method and system for compensating for circulating filter ink

Abstract

The embodiment of the present application relates to the technical field of ink circulation, and particularly relates to a circulating filtering ink compensation method and system.The compensation method comprises the following steps: S1, receiving a liquid level sensing signal sent by a liquid level sensor; S2, obtaining an ink amount change in a unit time period to obtain an ink output rate of a primary ink cartridge; S3, calculating and determining an ink supply amount and an ink supply rate according to the ink output rate of the primary ink cartridge; S4, adjusting an input signal of an ink supply pump on an ink compensation tank according to the ink supply rate to uniformly input ink in the ink compensation tank into the primary ink cartridge; and S5, monitoring a liquid level change rate in a unit time in real time, and adjusting an input signal of a constant pressure air pump on the ink compensation tank according to the liquid level change rate.The present application can avoid a situation that the ink supply rate changes too fast due to ink shortage or too fast ink adding rate of the primary ink cartridge, thereby improving the printing quality of the product, reducing external impurities entering the primary ink cartridge, and avoiding the problem of ink path blockage.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of ink circulation, and in particular to a circulating filtered ink compensation method and system. BACKGROUND

[0002] In existing digital inkjet equipment, the ink supply system of the main ink cartridge plays a crucial role. However, the existing ink supply system has some problems that affect the ink output quality and efficiency of the inkjet equipment. First, the main ink cartridge, i.e., the primary ink cartridge, needs to supply ink and circulate for the subsequent secondary ink cartridge. The liquid level is constantly changing. When the main ink cartridge is out of ink, it needs to be refilled in time, otherwise it is easy to cause the equipment to output ink abnormally due to lack of ink. When refilling ink, the current method is usually to add ink directly by extraction. This operation easily causes the amount of ink in the main ink cartridge to increase dramatically, resulting in a change in the ink supply rate. When the liquid level of the primary ink cartridge drops to a low level, the ink supply rate will slow down accordingly, which may cause the inkjet equipment to be insufficient in ink during printing, thereby affecting the printing quality. When the liquid level of the main ink cartridge is suddenly too high, the ink supply rate will speed up, which may cause too much ink to be output, also affecting the printing quality.

[0003] During the ink path circulation process, external impurities may exist, which can easily cause the ink path or the nozzle to be blocked during daily use. Generally, external impurities enter the main ink cartridge through the front end of the ink supply. Once the impurities enter the main ink cartridge and block the nozzle, manual cleaning is required, which not only increases the labor cost but also reduces the operating efficiency of the equipment. SUMMARY

[0004] In order to solve the technical problems that the inkjet equipment is easy to cause the ink supply rate to change when the ink is out of ink or refilled too quickly, affecting the printing quality, and the ink path is easy to be blocked due to external impurities when refilling ink, embodiments of the present application provide a circulating filtered ink compensation method and system.

[0005] According to one aspect of the embodiments of the present application, the present application provides a circulating filtered ink compensation method, which is applied to a circulating filtered ink compensation system. The compensation system includes a rate control system and a data acquisition system. The rate control system includes a master control module, an ink tank, a filtered circulation module, and a primary ink cartridge. The data acquisition system includes a distance measuring sensor, a time module, and a liquid level sensor. The method includes:

[0006] S1, receiving a liquid level sensing signal sent by the liquid level sensor, for detecting whether the amount of ink in the primary ink cartridge is lower than a preset liquid level;

[0007] S2, when the primary ink cartridge is lower than the preset liquid level, obtaining the ink output rate of the primary ink cartridge by the distance measuring sensor and the time module to obtain the ink amount change in a unit time period;

[0008] S3, according to the ink output rate of the primary ink cartridge, calculating and determining the ink supply amount and the ink supply rate, and calculating the extraction time according to the extraction power of the extraction pump in the filter circulation module, and the filter circulation module extracts and filters the corresponding ink from the ink tank to the ink supplement tank inside the filter circulation module according to the extraction time;

[0009] S4, adjusting the input signal of the ink supply pump on the ink supplement tank according to the ink supply rate to uniformly input the ink in the ink supplement tank into the primary ink cartridge;

[0010] S5, during the ink supply process, obtaining the liquid level change rate per unit time through the distance measuring sensor and the time module, and adjusting the input signal of the constant pressure air pump on the ink supplement tank according to the liquid level change rate;

[0011] The step S3 comprises specific steps:

[0012] S31, according to the ink output rate of the primary ink cartridge and the preset filling time, calculating and determining the required ink supply amount and ink supply rate after the preset filling time;

[0013] S32, calculating the extraction time required for extracting the corresponding ink amount by the extraction pump according to the ink supply amount;

[0014] S33, extracting the ink from the ink supplement tank to the ink supplement tank inside the filter circulation module according to the extraction time;

[0015] The step S5 specifically comprises:

[0016] S51, obtaining the distance data collected by the distance measuring sensor at the current time and the current time data of the time module, and combining the distance data at the current time and the current time data to form associated data;

[0017] S52, the main control module obtains a plurality of associated data at different times, and calculates the liquid level change rate in the primary ink cartridge according to the plurality of associated data;

[0018] S53, comparing the liquid level change rate with the predetermined liquid level change rate, and adjusting the input signal of the constant pressure air pump on the ink supplement tank according to the comparison result.

[0019] Further, the step S1 specifically comprises:

[0020] S11, establishing contact with the liquid level sensor arranged at the low position of the primary ink cartridge, and receiving the sensing signal of the liquid level sensor in real time;

[0021] S12, when the received sensing signal is switched to an ink shortage signal, checking the ink liquid level in the current primary ink cartridge through the distance measuring sensor;

[0022] S13, when the ink level is in the ink shortage ink level range, determine that the ink in the primary ink cartridge is lower than the preset level.

[0023] Further, the step S2 specifically comprises:

[0024] S21, the main control module sends a measurement signal to the ranging sensor, and receives the ranging parameter with the ultrasonic ranging echo data returned by the ranging sensor, and calculates the current liquid level height of the primary ink cartridge according to the ranging parameter, the internal temperature of the primary ink cartridge and the height parameter;

[0025] S22, compare the liquid level height with the low preset liquid level to verify the liquid level sensor;

[0026] S23, the time module measures the liquid level height at different times to calculate the current ink discharge rate of the primary ink cartridge.

[0027] Further, the step S21 comprises the following specific steps:

[0028] S211, the ranging sensor obtains the echo time by ultrasonic ranging at the top of the primary ink cartridge;

[0029] S212, the main control module calculates the height difference between the current liquid level and the ranging sensor according to the echo time and the internal temperature of the primary ink cartridge;

[0030] S213, according to the ranging height of the ranging sensor and the height difference between the current liquid level and the ranging sensor, the current liquid level height of the primary ink cartridge is obtained.

[0031] Further, the main control module is provided with a preset liquid level change rate, and the ink supply rate in the step S4 is the predetermined liquid level change rate plus the ink discharge rate.

[0032] Further, the ink supplement cartridge is relatively closed, and the internal pressure of the ink supplement cartridge is adjusted by the constant pressure air pump, and the required internal pressure adjustment formula of the ink supplement cartridge is:

[0033] ;

[0034] Wherein, ΔP is the required internal pressure adjustment of the ink supplement cartridge, is the predetermined liquid level change rate, v is the current liquid level change rate in the primary ink cartridge, and k is a constant, which depends on the geometry of the pipeline and the properties of the fluid; wherein, k is determined by the diameter d of the ink supply pump corresponding to the conveying pipeline, the length L of the conveying pipeline, the roughness of the pipeline and the density p of the ink and the viscosity μ of the ink.

[0035] In a second aspect, the embodiment also provides a circulating filter ink compensation system, which comprises a rate control system and a data acquisition system; the rate control system comprises a master control module, an ink tank, a filter circulating module and a primary ink cartridge; the data acquisition system comprises a distance measuring sensor, a time module and a liquid level sensor, the distance measuring sensor is used to acquire the height difference of the primary ink cartridge, the time module is used to determine the current measurement time, and the liquid level sensor is used to sense whether the height of the primary ink cartridge is in a preset range; the master control module is signal connected with the distance measuring sensor, the time module and the liquid level sensor respectively, and the ink compensation system executes the above-mentioned circulating filter ink compensation method through the master control module.

[0036] Further, the filter circulating module comprises a suction pump, a filter module and an ink compensation tank; the suction pump is control connected with the master control module, the inlet of the suction pump is arranged in the ink tank, and the outlet is connected with the inlet of the ink compensation tank through the filter module.

[0037] The application acquires and identifies whether the primary ink cartridge is in an ink shortage state through the data acquisition system, accurately acquires the ink liquid level to correct the operation of the liquid level sensor synchronously, when the ink shortage state is identified, the rate control system realizes the calculation and adjustment of the ink supply amount and the ink supply rate through the ink liquid level of the primary ink cartridge and the ink supply rate, and utilizes the filter circulating module to remove the impurities entering the primary ink cartridge, finally realizes the uniform ink compensation through the adjustment of the ink supply pump, avoids the case that the ink supply rate changes too fast due to the ink shortage or the too fast ink adding rate of the primary ink cartridge, and further improves the printing quality of the product, reduces the external impurities entering the primary ink cartridge, and avoids the problem of ink path blockage. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings:

[0039] Figure 1 A structure flow chart of the circulating filter ink compensation method in the embodiment of the application is shown.

[0040] Figure 2 A structure block diagram of the circulating filter ink compensation system in the embodiment of the application is shown. DETAILED DESCRIPTION

[0041] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are illustrated, it is to be understood that the application is not to be limited to those exemplary embodiments described herein which can be implemented in various forms without being limited by the embodiments set forth herein.

[0042] Embodiment 1:

[0043] Figure 1A structure flow chart of the circulating filtering ink compensation method in the embodiment is shown.

[0044] As shown in Figure 1 The embodiment provides a circulating filtering ink compensation method, which is applied to a circulating filtering ink compensation system and mainly used for intelligently regulating and controlling the ink level in a primary ink box, so as to ensure the stability of the ink supply rate of the primary ink box to a subsequent ink box and a nozzle and avoid affecting the printing quality due to ink shortage or large ink level change.

[0045] Specifically, the circulating filtering ink compensation system in the embodiment comprises a rate regulation system and a data acquisition system, wherein the data acquisition system is used for acquiring the liquid level data in the primary ink box and outputting the liquid level data to the rate regulation system. The rate regulation system is mainly used for calculating the ink output rate of the primary ink box to the subsequent ink box or nozzle according to the current liquid level data, calculating the ink supply amount and the ink supply rate according to the ink output rate, and then uniformly supplying ink to the primary ink box by controlling the input signal of the ink supply pump.

[0046] In terms of specific structure, the rate regulation system in the embodiment comprises a main control module, an ink tank, a filtering circulation module and a primary ink box. The data acquisition system specifically comprises a distance measuring sensor, a time module and a liquid level sensor. The distance measuring sensor is used for measuring the distance between the current liquid level of the primary ink box and the liquid level sensor. The time module is used for recording the data acquisition time to complete subsequent rate calculation. The liquid level sensor is used for sensing whether the current liquid level is lower than the preset liquid level. The subsequent ink supply process is started through the sensing wake-up mode. Specifically, the method in the embodiment specifically comprises:

[0047] S1, the liquid level sensor acquires the ink condition of the preset low position of the primary ink box. When the ink in the primary ink box is lower than the preset low position, the liquid level sensor sends a liquid level sensing signal to the main control module. The main control module receives the liquid level sensing signal and starts the ink supply process.

[0048] The liquid level sensor adopts a contact sensor and is arranged at the preset low position. When the water level is lower than the preset low position, the liquid level sensor outputs a corresponding liquid level sensing signal. The liquid level sensing signal is used for indicating that the ink amount in the primary ink box is lower than the preset liquid level. In an embodiment, the liquid level sensor adopts a capacitive level sensor. At least one pole piece is arranged at the preset low position.

[0049] As a preferred embodiment of the present embodiment, step S1 further comprises the following steps:

[0050] S11, the host module receives the sensing signal of the liquid level sensor in real time: after receiving the signal that the ink amount is lower than the preset liquid level, the host module receives the sensing signal of the liquid level sensor in real time within a time interval, determines whether there is a first ink cartridge shaking situation, and if there is no change within the signal period, it represents that the signal sent by the liquid level sensor at this time is a valid signal.

[0051] S12, signal verification of the liquid level sensor: after the sensing signal received by the host module is switched to the ink shortage signal, the reliability of the liquid level sensor is verified by verifying the ink level in the current first ink cartridge through the distance measuring sensor, so as to prevent the ink supply system from being out of order due to sensor damage, and the host module records the liquid level data at the current time for subsequent ink output rate calculation.

[0052] Among them, the host module associates the current time data and the liquid level data after obtaining the two data, and the host module calculates the ink supply rate through multiple associated data.

[0053] S13, verification result determination: when the ink level is in the ink shortage ink level range, it is determined that the ink in the first ink cartridge is lower than the preset liquid level, that is, the sensing signal of the liquid level sensor is normal, if the collected ink level is inconsistent, such as the current ink level is higher than the preset liquid level, it is determined that the current liquid level sensor may have sensing failure or failure, and the record is recorded and archived.

[0054] S2, when the first ink cartridge is lower than the preset liquid level, the host module calls the distance measuring sensor and the time module, obtains the collected data, and calculates the ink amount change in a unit time period, and then obtains the ink output rate of the first ink cartridge.

[0055] Among them, the host module calculates the height difference parameter between the current ink surface and the distance measuring sensor through the distance measuring sensor, obtains the ink level after calculation, associates the ink level parameter with the current time of the time module to obtain the liquid level data, and the host module calculates the ink amount change in a unit time period through multiple liquid level data,

[0056] As preferred, the distance measuring sensor in the embodiment includes a microwave sensor or an ultrasonic sensor.

[0057] In the embodiment, step S2 in the ink compensation method specifically includes:

[0058] S21, liquid level height calculation: the host module sends a measurement signal to the distance measuring sensor and receives the distance measuring parameter with ultrasonic distance measuring echo data returned by the distance measuring sensor, calculates the current liquid level height of the first ink cartridge according to the distance measuring parameter, the internal temperature of the first ink cartridge and the height parameter.

[0059] The liquid level height is equal to the distance between the ranging sensor and the bottom of the primary ink cartridge, minus the distance between the liquid level sensor and the ink surface calculated by the ranging method. The distance between the liquid level sensor and the ink surface is calculated based on the transmission and reception time difference of the ranging sensor and the speed of sound propagation within the primary ink cartridge. The speed of sound propagation within the primary ink cartridge is determined based on the temperature and gas density within the cartridge. Specifically, the temperature can be collected by a temperature sensor within the primary ink cartridge, and since the liquid velocity within the primary ink cartridge is relatively slow, the gas density can be approximated to the external atmospheric density.

[0060] S22. Data comparison: The main control module compares the liquid level height with the lower preset liquid level to determine whether the liquid level height is within the reasonable range of the lower preset liquid level, thereby verifying the liquid level sensor.

[0061] S23. Calculate the ink output rate: The main control module measures the liquid level height at different times through the time module and calculates the current ink output rate of the primary ink cartridge.

[0062] Here, the ink output rate represents the amount of ink reduced per unit time when the primary ink cartridge supplies ink to the secondary ink cartridge or printhead without ink supply, and when ink is returned. In this embodiment, the ink output rate is equal to the difference in liquid level height between two moments divided by the time difference.

[0063] As a preferred embodiment of the above scheme, step S21 includes the following specific steps:

[0064] S211, the ranging sensor obtains the echo time by ultrasonic ranging at the top of the primary ink cartridge;

[0065] S212, the main control module calculates the height difference between the current liquid level and the ranging sensor based on the echo time and the internal temperature of the primary ink cartridge;

[0066] S213, the main control module obtains the current liquid level of the primary ink cartridge based on the ranging height of the ranging sensor and the height difference between the current liquid level and the ranging sensor.

[0067] The ranging sensor records the time interval between the signal being sent by the transmitting unit and the signal being received by the receiving unit, and sends this time interval data to the main control module. The main control chip calculates the liquid level height based on this time interval data and temperature parameters.

[0068] S3. The main control chip calculates and determines the amount of ink needed for the current primary ink cartridge based on the ink output rate of the primary ink cartridge, as well as the ink supply speed to the primary ink cartridge. In order to extract the corresponding amount of ink, the main control chip calculates the extraction time based on the extraction power of the extraction pump in the filter circulation module. The filter circulation module extracts and filters the corresponding ink from the ink tank according to the extraction time and sends it to the replenishment ink box inside the filter circulation module.

[0069] The ink supplement tank is a component of the filtering circulation module and mainly serves as a buffer to buffer the ink.

[0070] As preferred, the step S3 comprises the following specific steps:

[0071] S31, the main control chip calculates the required ink supply amount and ink supply rate after the preset filling time according to the ink discharge rate of the primary ink cartridge and the preset filling time set in advance for controlling the ink supply rate.

[0072] The preset filling time is an internal parameter and can be set by an operator. It is mainly used to control the working time of the ink supply pump. For example, if the preset filling time is determined to be 180 seconds, the main control chip calculates the ink supply amount within 180 seconds according to the ink discharge rate, and the total amount of the ink supply amount and the amount of ink missing in the current primary ink cartridge is the ink supply amount, and the ink supply rate is calculated according to the preset filling time.

[0073] S32, the extraction time required for extracting the corresponding ink amount by the extraction pump is calculated according to the ink supply amount.

[0074] S33, the ink is extracted from the ink tank to the ink supplement tank inside the filtering circulation module according to the extraction time.

[0075] After determining the extraction time, the main control module quantitatively extracts the supplement to the ink supplement tank by the extraction pump, and filters the ink during the extraction process to filter out the impurities that may exist in the ink tank, thereby avoiding the problems such as blockage of the subsequent primary ink cartridge.

[0076] S4, the main control module adjusts the input signal of the ink supply pump on the ink supplement tank according to the ink supply rate to control the extraction rate of the ink supply pump, and uniformly inputs the ink in the ink supplement tank into the primary ink cartridge.

[0077] In an embodiment, a preset liquid level change rate is set in the main control module, and the ink supply rate in step S4 is the preset liquid level change rate plus the ink discharge rate.

[0078] S5, during the ink supply process, the liquid level change rate per unit time is obtained by the distance measuring sensor and the time module, and the input signal of the constant pressure air pump on the ink supplement tank is adjusted according to the liquid level change rate.

[0079] The ink supply port of the ink supplement tank to the primary ink cartridge is arranged at the bottom of the side surface of the primary ink cartridge, and a one-way check valve is arranged above the ink supply port, so that the ink entering the primary ink cartridge will not shake the ink liquid level in the primary ink cartridge due to the height difference.

[0080] When the primary ink cartridge outputs ink to the rear end, the main control module reduces the influence on the quality of the rear-end inkjet printing by keeping the air pressure in the primary ink cartridge relatively constant. The upper part of the primary ink cartridge is relatively closed and can be connected to the main control module for air pressure control through an intelligent pressure regulating valve.

[0081] In an embodiment, step S5 specifically comprises:

[0082] S51, the main control chip acquires distance data collected by the distance measuring sensor at the current time and current time data of the time module, and combines the distance data at the current time and the current time data to form associated data.

[0083] S52, the main control module acquires a plurality of associated data at different times, and calculates a liquid level change rate in the primary ink cartridge according to the plurality of associated data.

[0084] S53, compare the liquid level change rate with the predetermined liquid level change rate, and adjust the input signal of the constant pressure air pump output to the ink replenishing box according to the comparison result.

[0085] In the embodiment, the main control chip monitors the rate in real time and makes a comparison through the distance measuring sensor during the ink adding process, and adjusts the ink supply rate correspondingly after the comparison.

[0086] As a preferred embodiment of the present embodiment, the ink replenishing box is relatively closed, and the internal pressure of the ink replenishing box is adjusted by the constant pressure air pump. The required internal pressure adjustment of the ink replenishing box is calculated by the formula:

[0087] ;

[0088] Where ΔP is the required internal pressure adjustment of the ink replenishing box, is the predetermined liquid level change rate, v is the current liquid level change rate in the primary ink cartridge, and k is a constant, which depends on the geometry of the pipeline and the properties of the fluid; wherein k is determined by the diameter d of the corresponding delivery pipeline of the ink supply pump, the length L of the delivery pipeline, the roughness of the pipeline, and the density p and viscosity m of the ink.

[0089] Wherein the main control chip has the above algorithm built-in, and the liquid level change rate is acquired in real time by the distance measuring sensor, the required pressure of the current ink replenishing box is calculated, and the corresponding ink supply rate adjustment is made by adjusting the pressure in the ink replenishing box.

[0090] Embodiment 2:

[0091] The embodiment provides a circulating filter ink compensation system, which specifically comprises a rate regulation system, a data acquisition system 20 and a first ink box 30, wherein the rate regulation system comprises a main control module 14, an ink tank 11 and a filter circulation module, the main control module 14 is used as a main control component, is used for acquiring data of a sensor and processing control of a constant pressure air pump to regulate a rate. The data acquisition system 20 comprises a distance measuring sensor 22, a time module 23 and a liquid level sensor 21, the distance measuring sensor 22 is used for acquiring a height difference of the first ink box 30, the time module 23 is used for determining a current measurement time, and the liquid level sensor 21 is used for sensing whether the height of the first ink box 30 is in a preset range; the main control module 14 is in signal connection with the distance measuring sensor 22, the time module 23 and the liquid level sensor 21 respectively, and specifically, in the embodiment, the ink compensation system executes the circulating filter ink compensation method through the main control module 14.

[0092] The filter ink compensation method specifically comprises the following steps.

[0093] S1, receiving a liquid level sensing signal sent by the liquid level sensor 21, and used for detecting whether the amount of ink in the first ink box 30 is lower than a preset liquid level;

[0094] S2, when the first ink box 30 is lower than the preset liquid level, acquiring ink amount change in a unit time period through the distance measuring sensor 22 and the time module 23, and obtaining an ink output rate of the first ink box 30;

[0095] S3, according to the ink output rate of the first ink box 30, calculating and determining an ink supply amount and an ink supply rate, and calculating an extraction time according to an extraction power of an extraction pump in the filter circulation module, and the filter circulation module extracts and filters corresponding ink from the ink tank 11 to the ink supplement tank 13 in the filter circulation module according to the extraction time;

[0096] S4, adjusting an input signal of an ink supply pump on the ink supplement tank 13 according to the ink supply rate, and inputting the ink in the ink supplement tank 13 into the first ink box 30 at a constant speed;

[0097] S5, during the ink supply process, obtaining a liquid level change rate per unit time through the distance measuring sensor 22 and the time module 23, and adjusting an input signal of a constant pressure air pump on the ink supplement tank 13 according to the liquid level change rate.

[0098] More specifically, the ink compensation system executes the circulating filter ink compensation method described in embodiment 1 through the main control module 14.

[0099] In hardware aspect, the filtering cycle module comprises a pumping pump, the filtering module 12 and the ink tank 13, the pumping pump is connected with the main control module 14, the pumping pump inlet is arranged in the ink tank 11, and the outlet is connected with the inlet of the ink tank 13 through the filtering module 12. Preferably, the distance measuring sensor 22 is an ultrasonic sensor, and the liquid level sensor 21 is a capacitive liquid level sensor 21.

[0100] It should be noted that the above examples illustrate the application rather than limit the application, and alternative examples can be designed by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word comprising does not exclude the presence of elements or steps not listed in the claim. The word a or an shall not exclude the presence of a plurality of elements, for example, a plurality of identical elements. The application can be implemented by means of both hardware and software, and any combinations of them. In a unit claim enumerating several means, the several means can be embodied by one and the same item of hardware. The use of the words first, second and third, etc. do not imply any order. These words have been used to name the circumstances in which the embodiments have been described, but shall not be construed as limiting. The steps of those embodiments, in particular, when described in a method claim, shall not be construed as necessarily limited to the order in which they are described.

Claims

1. A method for compensating for circulating filtered ink, characterized in that, An application is made in a circulating filtration ink compensation system, the compensation system comprising a rate control system and a data acquisition system; the rate control system comprises a main control module, an ink tank, a filtration circulation module, and a primary ink cartridge; the data acquisition system comprises a distance sensor, a time module, and a liquid level sensor; the method comprises: S1. Receive the liquid level sensing signal sent by the liquid level sensor to detect whether the ink level in the primary ink cartridge is lower than the preset liquid level. S2. When the primary ink cartridge is below the preset level, the ink volume change within a unit time period is obtained through the distance sensor and the time module to obtain the ink output rate of the primary ink cartridge. S3. Calculate and determine the ink supply volume and ink supply rate based on the ink output rate of the primary ink cartridge, and calculate the extraction time based on the extraction power of the extraction pump in the filter circulation module. The filter circulation module extracts and filters the corresponding ink from the ink tank to the replenishment box inside the filter circulation module according to the extraction time. S4. Adjust the input signal of the ink supply pump on the ink supply box according to the ink supply rate, and input the ink in the ink supply box into the primary ink cartridge at a uniform speed. S5. During the ink supply process, the liquid level change rate per unit time is obtained through the distance sensor and the time module, and the input signal of the constant pressure air pump on the ink replenishment box is adjusted according to the liquid level change rate. Step S3 includes the following specific steps: S31, based on the ink output rate of the primary ink cartridge and the preset filling time, calculate and determine the required ink supply amount and ink supply rate after the preset filling time. S32, calculate the extraction time required to extract the corresponding amount of ink using the extraction pump based on the ink supply volume; S33, according to the extraction time, draw ink from the ink tank into the ink replenishment tank inside the filter circulation module; Step S5 specifically includes: S51, acquire the distance data collected by the ranging sensor at the current moment and the current moment data of the time module, and combine the distance data and the current moment data at the current moment to form associated data; S52, the main control module acquires multiple related data at different times, and calculates the liquid level change rate in the primary ink cartridge based on the multiple related data; S53 compares the liquid level change rate with the predetermined liquid level change rate, and adjusts the input signal of the constant pressure air pump output to the ink replenishment box according to the comparison result.

2. The circulating filter ink compensation method according to claim 1, characterized in that, Step S1 specifically includes: S11 establishes a connection with the liquid level sensor located at the low position of the primary ink cartridge and receives the sensing signal from the liquid level sensor in real time. S12, when the received sensing signal switches to an ink shortage signal, the ink level in the current primary ink cartridge is checked by the ranging sensor; S13, when the ink level is in the range of ink level when ink is low, it is determined that the ink in the primary ink cartridge is lower than the preset level.

3. The circulating filter ink compensation method according to claim 1, characterized in that, Step S2 specifically includes: S21. The main control module sends a measurement signal to the ranging sensor and receives the ranging parameters with ultrasonic ranging echo data returned by the ranging sensor. Based on the ranging parameters, the internal temperature of the primary ink cartridge, and the height parameters, the module calculates the current liquid level height of the primary ink cartridge. S22. Compare the liquid level height with the preset low liquid level to verify the liquid level sensor; S23. The ink level is measured at different times by the time module, and the current ink output rate of the first-level ink cartridge is calculated.

4. The circulating filter ink compensation method according to claim 3, characterized in that, Step S21 includes the following specific steps: S211, the ranging sensor obtains the echo time by ultrasonic ranging at the top of the primary ink cartridge; S212, the main control module calculates the height difference between the current liquid level and the ranging sensor based on the echo time and the internal temperature of the primary ink cartridge; S213, based on the ranging height of the ranging sensor and the height difference between the current liquid level and the ranging sensor, the current liquid level of the primary ink cartridge is obtained.

5. The circulating filter ink compensation method according to claim 1, characterized in that, The main control module is set with a preset liquid level change rate, and the ink supply rate in step S4 is the preset liquid level change rate plus the ink output rate.

6. The circulating filter ink compensation method according to claim 1, characterized in that, The interior of the ink cartridge is relatively sealed. The internal pressure of the ink cartridge is adjusted by the constant pressure air pump. The formula for calculating the required internal pressure of the ink cartridge is as follows: ； Wherein, ΔP represents the internal pressure that the ink cartridge needs to be adjusted. The predetermined liquid level change rate is given by v, which is the current liquid level change rate in the primary ink cartridge, and k is a constant that depends on the geometry of the pipe and the properties of the fluid. Among them, k is determined by the diameter d of the corresponding delivery pipe of the ink pump, the length L of the delivery pipe, the pipe roughness, and the density ρ and viscosity μ of the ink.

7. A circulating filter ink compensation system, characterized in that, The system includes a rate control system and a data acquisition system. The rate control system includes a main control module, an ink tank, a filter circulation module, and a primary ink cartridge. The data acquisition system includes a distance sensor, a time module, and a liquid level sensor. The distance sensor is used to collect the height difference of the primary ink cartridge, the time module is used to determine the current measurement time, and the liquid level sensor is used to sense whether the height of the primary ink cartridge is within a preset range. The main control module is connected to the distance sensor, the time module, and the liquid level sensor respectively. The ink compensation system executes the circulating filter ink compensation method according to any one of claims 1-6 through the main control module.

8. The circulating filter ink compensation system according to claim 7, characterized in that, The filtration circulation module includes an extraction pump, a filtration module, and an ink replenishment tank; the extraction pump is controlled and connected to the main control module, the inlet of the extraction pump is located inside the ink tank, and the outlet of the extraction pump is connected to the inlet of the ink replenishment tank through the filtration module.

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