An anti-backflow ink cartridge and a control method and device thereof

Abstract

The application relates to the technical field of ink cartridges, and discloses an anti-backflow ink cartridge and a control method and device thereof. When unstable negative pressure is detected during the operation of the ink cartridge, the cause of the unstable negative pressure is determined; when the cause of the unstable negative pressure is determined to be ink suction pipeline blockage, a liquid level sensor is controlled to feed a secondary ink cartridge ink shortage signal to an ink return circulating pump and a negative pressure system, so that the ink return circulating pump and the negative pressure system stop working; when the cause of the unstable negative pressure is determined to be unsmooth ink return, the liquid level sensor is controlled to feed a working stop signal to an ink inlet circulating pump and feed an increased power signal to the ink return circulating pump, so that the ink inlet circulating pump stops working and the power of ink path circulation is increased. The PLC liquid level control structure is increased, unstable negative pressure of the ink path can be detected, the backflow problem caused by excessive negative pressure and excessive ink suction is avoided, and the stability of the ink supply part during circulation is increased.

Description

Technical Field

[0001] This invention relates to the field of ink cartridge technology, and in particular to an anti-backflow ink cartridge and its control method and device. Background Technology

[0002] Currently, the problem of ink cartridge backflow is addressed by adding a liquid level control ink supply system and an ink shortage alarm system to the primary and secondary ink cartridges of the equipment. However, during the ink circulation process, this method encounters issues with the length of the piping in the digital section of the equipment, leading to problems such as excessive pressure in the circulating ink supply pump, and ink backflow from the secondary ink cartridges into the air circuit, causing blockages and unstable negative pressure. Summary of the Invention

[0003] This invention provides an anti-backflow ink cartridge and its control method and device, which adds a PLC liquid level control structure, can detect unstable negative pressure in the ink path, avoid backflow problems caused by excessive negative pressure and excessive ink extraction, and increase the stability of the ink supply section during circulation.

[0004] To address the aforementioned technical problems, a first aspect of the present invention provides a method for controlling backflow ink cartridges, comprising:

[0005] When unstable negative pressure is detected during ink cartridge operation, determine the cause of the unstable negative pressure;

[0006] When it is determined that the cause of unstable negative pressure is blockage in the ink extraction pipeline, the control liquid level sensor feeds back the ink shortage signal of the secondary ink cartridge to the ink return circulation pump and the negative pressure system, so that the ink return circulation pump and the negative pressure system stop working.

[0007] When it is determined that the cause of the unstable negative pressure is the poor ink return flow, the control liquid level sensor will feed back a stop signal to the ink inlet circulation pump and send a power increase signal to the ink return circulation pump, so that the ink inlet circulation pump stops working and the power of the ink circulation is increased.

[0008] Furthermore, the ink cartridge operation process is as follows:

[0009] Ink is introduced into the primary ink cartridge, the ink inlet circulation pump and negative pressure system of the primary ink cartridge are started, and the negative pressure of the ink path is detected by the negative pressure display, so that the ink inlet circulation pump and the negative pressure system of the primary ink cartridge control the ink path circulation during the operation of the ink cartridge.

[0010] Furthermore, the detection of unstable negative pressure during ink cartridge operation specifically refers to:

[0011] Detect the real-time negative pressure fluctuation frequency on the negative pressure display;

[0012] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the difference between the real-time negative pressure fluctuation frequency and the preset negative pressure fluctuation frequency exceeds a preset threshold, it is determined that unstable negative pressure has occurred in the ink path.

[0013] Furthermore, the cause of the unstable negative pressure was determined to be a blockage in the ink extraction pipeline, specifically:

[0014] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is greater than the preset negative pressure fluctuation frequency, it is determined that the cause of unstable negative pressure is blockage in the ink extraction pipeline.

[0015] Furthermore, the cause of the unstable negative pressure was determined to be poor ink return, specifically:

[0016] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is less than the preset negative pressure fluctuation frequency, the cause of unstable negative pressure is determined to be poor ink return.

[0017] The first aspect of this invention provides a backflow prevention ink cartridge control method. When unstable negative pressure is detected during ink cartridge operation, the cause of the unstable negative pressure is determined. When the cause of the unstable negative pressure is determined to be a blockage in the ink extraction pipeline, the control liquid level sensor feeds back a low ink signal from the secondary ink cartridge to the ink return circulation pump and the negative pressure system, causing the ink return circulation pump and the negative pressure system to stop working. When the cause of the unstable negative pressure is determined to be poor ink return, the control liquid level sensor feeds back a stop signal to the inlet circulation pump and sends a power increase signal to the ink return circulation pump, causing the inlet circulation pump to stop working and increasing the power of the ink path circulation. This invention adds a PLC liquid level control structure, which can detect unstable ink path negative pressure, avoid backflow problems caused by excessive negative pressure and excessive ink extraction, and increase the stability of the ink supply circulation.

[0018] A second aspect of the present invention provides an anti-backflow ink cartridge, comprising: an ink pump for a primary ink cartridge, a PLC, a relay, a level sensor, a negative pressure sensor, a negative pressure display, a negative pressure system, and a circulation pump for a secondary ink cartridge;

[0019] The ink pump of the primary ink cartridge is connected to the ±24V port output from the same power supply box as the PLC.

[0020] The signal line of the ink pump of the primary ink cartridge is connected to the first load port of the relay;

[0021] The second and fourth load ports of the relay are connected to the +24V port synchronously output by the PLC.

[0022] The third load port of the relay is connected to the PLC;

[0023] The normally closed line of the liquid level sensor is connected to the input terminal of the PLC;

[0024] The negative pressure sensor, the negative pressure display, and the circulation pump of the secondary ink cartridge are all connected to the negative pressure system.

[0025] Furthermore, the liquid level sensor also includes:

[0026] The ±24V power supply of the liquid level sensor is synchronized with the power supply of the PLC.

[0027] Furthermore, the negative pressure system also includes:

[0028] The power supply of the negative pressure system is synchronized with the power supply of the PLC.

[0029] The second aspect of the present invention provides an anti-backflow ink cartridge, which drives the ink path by adding a negative pressure system, determines whether the secondary ink cartridge is full by adding a liquid level sensor, and detects the instability of the negative pressure in the ink path by adding a PLC liquid level control structure, thereby avoiding backflow problems caused by excessive negative pressure and excessive ink drawing, and increasing the stability of the ink supply section during circulation.

[0030] A third aspect of the present invention provides an anti-backflow ink cartridge control device, comprising: a connection module, an upgrade package generation module, a sending module, and a verification module;

[0031] Detection module, first control module, and second control module;

[0032] The detection module is used to determine the cause of unstable negative pressure when it is detected during the operation of the ink cartridge.

[0033] When the cause of the unstable negative pressure is determined to be a blockage in the ink extraction pipeline, the first control module controls the liquid level sensor to feed back the ink shortage signal of the secondary ink cartridge to the ink return circulation pump and the negative pressure system, so that the ink return circulation pump and the negative pressure system stop working.

[0034] The second control module is used to control the liquid level sensor to feed back a stop signal to the ink inlet circulation pump and send a power increase signal to the ink return circulation pump when it is determined that the cause of the unstable negative pressure is the poor ink return. This causes the ink inlet circulation pump to stop working and increases the power of the ink circulation.

[0035] Furthermore, the detection module includes: a detection unit and a comparison unit;

[0036] The detection unit is used to detect the real-time negative pressure fluctuation frequency on the negative pressure display.

[0037] The comparison unit is used to compare the real-time negative pressure fluctuation frequency with the preset negative pressure fluctuation frequency. When the difference between the real-time negative pressure fluctuation frequency and the preset negative pressure fluctuation frequency exceeds a preset threshold, it is determined that an unstable negative pressure has occurred in the ink path.

[0038] A third aspect of this invention provides an anti-backflow ink cartridge control device. Based on the organic integration of modules, when unstable negative pressure is detected during ink cartridge operation, the cause of the unstable negative pressure is determined. When the cause of the unstable negative pressure is determined to be a blockage in the ink extraction pipeline, the control liquid level sensor feeds back a low ink signal from the secondary ink cartridge to the return ink circulation pump and the negative pressure system, causing the return ink circulation pump and the negative pressure system to stop working. When the cause of the unstable negative pressure is determined to be poor ink return, the control liquid level sensor feeds back a stop signal to the inlet ink circulation pump and sends a power increase signal to the return ink circulation pump, causing the inlet ink circulation pump to stop working and increasing the power of the ink circulation. This invention adds a PLC liquid level control structure, which can detect unstable ink path negative pressure, avoid backflow problems caused by excessive negative pressure and excessive ink extraction, and increase the stability of the ink supply circulation. Attached Figure Description

[0039] Figure 1 A flowchart illustrating one embodiment of the anti-backflow ink cartridge control method provided by the present invention;

[0040] Figure 2 A schematic diagram of one embodiment of the anti-backflow ink cartridge provided by the present invention;

[0041] Figure 3 This is a schematic diagram of one embodiment of the anti-backflow ink cartridge control device provided by the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] After filling the primary ink cartridge with ink and turning on the power, the primary ink cartridge's ink pump starts working. Due to the length and angle of the tubing, the resistance is significant. At this point, relying solely on the pump to supply ink is insufficient to reach the secondary ink cartridge. Therefore, a negative pressure system is needed to drive the ink path. The ink from the primary cartridge is carried to the secondary cartridge for storage and heating. During storage, it's impossible to determine if the secondary cartridge is full; therefore, a liquid level sensor is required for this purpose. Without a liquid level sensor to determine if the secondary cartridge is full, the ink path will continuously pump ink, leading to overflow. This causes the negative pressure to pull back into the negative pressure tubing. If there are foreign objects or blockages in the negative pressure tubing, the ink path will become unstable, resulting in unstable negative pressure.

[0045] See Figure 1 This is a flowchart illustrating an embodiment of the anti-backflow ink cartridge control method provided by the present invention. The method includes steps 101 to 103, each of which is detailed below:

[0046] Step 101: When unstable negative pressure is detected during the operation of the ink cartridge, determine the cause of the unstable negative pressure.

[0047] Furthermore, in the first embodiment of the present invention, the ink cartridge operation process is specifically as follows:

[0048] Ink is introduced into the primary ink cartridge, the ink inlet circulation pump and negative pressure system of the primary ink cartridge are started, and the negative pressure of the ink path is detected by the negative pressure display, so that the ink inlet circulation pump and the negative pressure system of the primary ink cartridge control the ink path circulation during the operation of the ink cartridge.

[0049] Furthermore, in the first embodiment of the present invention, an unstable negative pressure is detected during the operation of the ink cartridge, specifically as follows:

[0050] Detect the real-time negative pressure fluctuation frequency on the negative pressure display;

[0051] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the difference between the real-time negative pressure fluctuation frequency and the preset negative pressure fluctuation frequency exceeds a preset threshold, it is determined that unstable negative pressure has occurred in the ink path.

[0052] In the first embodiment of this invention, during the operation of the ink cartridge, if unstable negative pressure or unstable external factors occur, the ink path may continuously draw ink, leading to ink backflow. To avoid instability in the ink path, this invention adds a liquid level sensor to monitor the liquid level signal in real time to prevent backflow caused by excessive negative pressure difference after the ink supply is full. Simultaneously, a negative pressure display is used to monitor the negative pressure in the ink path in real time. The stability of the current negative pressure is determined by observing the frequency of negative pressure fluctuations on the negative pressure display and comparing it with previously preset values. This invention, by adding a liquid level sensor, can better control the ink cartridge and maintain a stable ink path, significantly improving performance during continuous operation of the ink cartridge.

[0053] Step 102: When it is determined that the cause of the unstable negative pressure is a blockage in the ink extraction pipeline, the control liquid level sensor feeds back the ink shortage signal of the secondary ink cartridge to the ink return circulation pump and the negative pressure system, so that the ink return circulation pump and the negative pressure system stop working.

[0054] Furthermore, in the first embodiment of the present invention, the cause of the unstable negative pressure is determined to be blockage in the ink extraction pipeline, specifically:

[0055] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is greater than the preset negative pressure fluctuation frequency, it is determined that the cause of unstable negative pressure is blockage in the ink extraction pipeline.

[0056] In the first embodiment of the present invention, when the device experiences unstable negative pressure during operation, the current real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. If the real-time negative pressure fluctuation frequency is greater than the preset negative pressure fluctuation frequency, it indicates that there is a foreign object in the ink pipeline causing blockage and preventing ink from being drawn, resulting in a continuous increase and instability of the negative pressure during ink drawing. At this time, in order to prevent the negative pressure from continuously increasing, the liquid level sensor will send a signal to the secondary ink cartridge to stop the operation of the entire circulating ink circuit, thus better preventing the ink from being pulled back to the negative pressure air pipe by the negative pressure when the circulating pump and negative pressure are constantly working.

[0057] Step 103: When it is determined that the cause of the unstable negative pressure is the poor ink return flow, the control liquid level sensor will feed back a stop signal to the ink inlet circulation pump and send a power increase signal to the ink return circulation pump to stop the ink inlet circulation pump and increase the power of the ink circulation.

[0058] Furthermore, in the first embodiment of the present invention, the cause of the unstable negative pressure is determined to be uneven ink return, specifically:

[0059] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is less than the preset negative pressure fluctuation frequency, the cause of unstable negative pressure is determined to be poor ink return.

[0060] In the first embodiment of this invention, if the real-time negative pressure fluctuation frequency is less than the preset negative pressure fluctuation frequency, it indicates that during the normal ink extraction process at the ink inlet, there is a problem with the ink from the secondary ink cartridge flowing back into the primary ink cartridge, preventing proper discharge of the secondary ink cartridge. At this time, the level sensor sends a stop signal to the ink inlet circulation pump to stop its ink supply and other operations; simultaneously, it sends a power increase signal to the return ink circulation pump to increase the circulation power and negative pressure power. Without the level sensor, the ink path cannot determine whether the circulation requirements have been met during circulation. With the addition of the level sensor, the sensor's feedback signal to the PLC can determine the ink flow rate, and its feedback protection signal effectively prevents ink backflow caused by conflicts between the negative pressure system and the mechanical control components.

[0061] In summary, the first embodiment of this invention provides a backflow prevention ink cartridge control method. When unstable negative pressure is detected during ink cartridge operation, the cause of the unstable negative pressure is determined. When the cause of the unstable negative pressure is determined to be a blockage in the ink extraction pipeline, the control liquid level sensor feeds back a low ink signal from the secondary ink cartridge to the ink return circulation pump and the negative pressure system, causing the ink return circulation pump and the negative pressure system to stop working. When the cause of the unstable negative pressure is determined to be poor ink return, the control liquid level sensor feeds back a stop signal to the ink inlet circulation pump and sends a power increase signal to the ink return circulation pump, causing the ink inlet circulation pump to stop working and increasing the power of the ink path circulation. This invention adds a PLC liquid level control structure, which can detect unstable ink path negative pressure, avoid backflow problems caused by excessive negative pressure and excessive ink extraction, and increase the stability of the ink supply circulation.

[0062] Example 2

[0063] See Figure 2 This is a structural schematic diagram of an embodiment of the anti-backflow ink cartridge provided by the present invention. The ink cartridge includes an ink pump for the primary ink cartridge, a PLC, a relay, a liquid level sensor, a negative pressure sensor, a negative pressure display, a negative pressure system, and a circulation pump for the secondary ink cartridge.

[0064] The ink pump of the primary ink cartridge is connected to the ±24V port output from the same power supply box as the PLC;

[0065] The signal line of the ink pump of the primary ink cartridge is connected to the first load port of the relay;

[0066] The second and fourth load ports of the relay are connected to the +24V port of the PLC synchronous output;

[0067] The third load port of the relay is connected to the PLC;

[0068] The normally closed line of the liquid level sensor is connected to the input terminal (in) of the PLC;

[0069] The negative pressure sensor, the negative pressure display, and the circulation pump of the secondary ink cartridge are all connected to the negative pressure system.

[0070] Furthermore, in the second embodiment of the present invention, the liquid level sensor further includes:

[0071] The ±24V power supply of the liquid level sensor is synchronized with the power supply of the PLC.

[0072] Furthermore, in the second embodiment of the present invention, the negative pressure system further includes:

[0073] The power supply of the negative pressure system is synchronized with the power supply of the PLC.

[0074] In the second embodiment of this invention, the PLC is controlled as a whole using a common-zero power supply. The main structural components are: the ink pump of the first-stage ink cartridge is connected to the same ±24V power supply as the PLC; the signal line of the ink pump is connected to the load port "1" of a solid-state relay; ports "2" and "4" of the solid-state relay are connected to the +24V port synchronously output by the PLC; and finally, port "3" of the solid-state relay is connected to the PLC for on / off control signals. The signal control structure for the second-stage ink cartridge involves synchronizing the ±24V power supply of the level sensor with the PLC power supply, and then connecting the normally closed wire (black wire) of the level sensor to the PLC input terminal to control signal on / off. The control structure for the ink return section of the second-stage ink cartridge involves the negative pressure system supplying signals to the ink return circulation pump. The power supply of the negative pressure system is synchronized with the PLC at ±24V; and then the lines of the negative pressure sensor, negative pressure display, and ink return circulation pump are all connected to the negative pressure system for control. Figure 2 The ink pump is equivalent to the ink inlet circulation pump, and the circulation pump is equivalent to the ink return circulation pump.

[0075] In summary, the second embodiment of the present invention provides an anti-backflow ink cartridge. By adding a negative pressure system to drive the ink path, by adding a liquid level sensor to determine whether the secondary ink cartridge is full, and by adding a PLC liquid level control structure, unstable negative pressure in the ink path can be detected, avoiding backflow problems caused by excessive negative pressure and excessive ink extraction, thus increasing the stability of the ink supply section during circulation.

[0076] Example 3

[0077] See Figure 3 This is a schematic diagram of an embodiment of the anti-backflow ink cartridge control device provided by the present invention. The device includes a detection module 201, a first control module 202, and a second control module 203.

[0078] The detection module 201 is used to determine the cause of unstable negative pressure when it is detected during the operation of the ink cartridge;

[0079] The first control module 202 is used to control the liquid level sensor to feed back the ink shortage signal of the secondary ink cartridge to the ink return circulation pump and the negative pressure system when it is determined that the cause of the unstable negative pressure is the blockage of the ink extraction pipeline, so as to stop the ink return circulation pump and the negative pressure system from working.

[0080] The second control module 203 is used to control the liquid level sensor to feed back a stop signal to the ink inlet circulation pump and send a power increase signal to the ink return circulation pump when it is determined that the cause of the unstable negative pressure is the poor ink return. This causes the ink inlet circulation pump to stop working and increases the power of the ink circulation.

[0081] Furthermore, in the third embodiment of the present invention, the ink cartridge operation process is specifically as follows:

[0082] Ink is introduced into the primary ink cartridge, the ink inlet circulation pump and negative pressure system of the primary ink cartridge are started, and the negative pressure of the ink path is detected by the negative pressure display, so that the ink inlet circulation pump and the negative pressure system of the primary ink cartridge control the ink path circulation during the operation of the ink cartridge.

[0083] Furthermore, in the third embodiment of the present invention, the detection module 201 includes: a detection unit and a comparison unit;

[0084] The detection unit is used to detect the real-time negative pressure fluctuation frequency on the negative pressure display.

[0085] The comparison unit is used to compare the real-time negative pressure fluctuation frequency with the preset negative pressure fluctuation frequency. When the difference between the real-time negative pressure fluctuation frequency and the preset negative pressure fluctuation frequency exceeds a preset threshold, it is determined that an unstable negative pressure has occurred in the ink path.

[0086] Furthermore, in the third embodiment of the present invention, the cause of the unstable negative pressure is determined to be blockage in the ink extraction pipeline, specifically:

[0087] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is greater than the preset negative pressure fluctuation frequency, it is determined that the cause of unstable negative pressure is blockage in the ink extraction pipeline.

[0088] Furthermore, in the third embodiment of the present invention, the cause of the unstable negative pressure is determined to be uneven ink return, specifically:

[0089] The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is less than the preset negative pressure fluctuation frequency, the cause of unstable negative pressure is determined to be poor ink return.

[0090] In summary, the third embodiment of this invention provides an anti-backflow ink cartridge control device. Based on the organic integration of modules, when unstable negative pressure is detected during ink cartridge operation, the cause of the unstable negative pressure is determined. When the cause of the unstable negative pressure is determined to be a blockage in the ink extraction pipeline, the control liquid level sensor feeds back the secondary ink cartridge ink shortage signal to the ink return circulation pump and the negative pressure system, causing the ink return circulation pump and the negative pressure system to stop working. When the cause of the unstable negative pressure is determined to be poor ink return, the control liquid level sensor feeds back a stop signal to the ink inlet circulation pump and sends a power increase signal to the ink return circulation pump, causing the ink inlet circulation pump to stop working and increasing the power of the ink path circulation. This invention adds a PLC liquid level control structure, which can detect unstable ink path negative pressure, avoid backflow problems caused by excessive negative pressure and excessive ink extraction, and increase the stability of the ink supply circulation.

[0091] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for controlling backflow ink cartridges, characterized in that, include: When unstable negative pressure is detected during ink cartridge operation, determine the cause of the unstable negative pressure; When it is determined that the cause of unstable negative pressure is blockage in the ink extraction pipeline, the control liquid level sensor feeds back the ink shortage signal of the secondary ink cartridge to the ink return circulation pump and the negative pressure system, so that the ink return circulation pump and the negative pressure system stop working. When it is determined that the cause of the unstable negative pressure is the poor ink return flow, the control liquid level sensor will feed back a stop signal to the ink inlet circulation pump and send a power increase signal to the ink return circulation pump to stop the ink inlet circulation pump and increase the power of the ink circulation. Specifically, the detection of unstable negative pressure during ink cartridge operation refers to: Detect the real-time negative pressure fluctuation frequency on the negative pressure display; The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the difference between the real-time negative pressure fluctuation frequency and the preset negative pressure fluctuation frequency exceeds a preset threshold, it is determined that unstable negative pressure has occurred in the ink path.

2. The anti-backflow ink cartridge control method according to claim 1, characterized in that, The ink cartridge operation process is as follows: Ink is introduced into the primary ink cartridge, the ink inlet circulation pump and negative pressure system of the primary ink cartridge are started, and the negative pressure of the ink path is detected by the negative pressure display, so that the ink inlet circulation pump and the negative pressure system of the primary ink cartridge control the ink path circulation during the operation of the ink cartridge.

3. The anti-backflow ink cartridge control method according to claim 1, characterized in that, The cause of the unstable negative pressure was determined to be a blockage in the ink extraction pipeline, specifically: The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is greater than the preset negative pressure fluctuation frequency, it is determined that the cause of unstable negative pressure is blockage in the ink extraction pipeline.

4. The anti-backflow ink cartridge control method according to claim 1, characterized in that, The cause of the unstable negative pressure was determined to be poor ink return, specifically: The real-time negative pressure fluctuation frequency is compared with the preset negative pressure fluctuation frequency. When the real-time negative pressure fluctuation frequency is less than the preset negative pressure fluctuation frequency, the cause of unstable negative pressure is determined to be poor ink return.

5. A backflow prevention ink cartridge, characterized in that, The backflow prevention ink cartridge control method according to any one of claims 1-4 includes: an ink pump for the primary ink cartridge, a PLC, a relay, a level sensor, a negative pressure sensor, a negative pressure display, a negative pressure system, and a circulation pump for the secondary ink cartridge. The ink pump of the primary ink cartridge is connected to the ±24V port output from the same power supply box as the PLC. The signal line of the ink pump of the primary ink cartridge is connected to the first load port of the relay; The second and fourth load ports of the relay are connected to the +24V port synchronously output by the PLC. The third load port of the relay is connected to the PLC; The normally closed line of the liquid level sensor is connected to the input terminal of the PLC; The negative pressure sensor, the negative pressure display, and the circulation pump of the secondary ink cartridge are all connected to the negative pressure system.

6. The anti-backflow ink cartridge according to claim 5, characterized in that, The liquid level sensor further includes: The ±24V power supply of the liquid level sensor is synchronized with the power supply of the PLC.

7. The anti-backflow ink cartridge according to claim 5, characterized in that, The negative pressure system also includes: The power supply of the negative pressure system is synchronized with the power supply of the PLC.

8. A backflow prevention ink cartridge control device, characterized in that, include: Detection module, first control module, and second control module; The detection module is used to determine the cause of unstable negative pressure when it is detected during the operation of the ink cartridge. When the cause of the unstable negative pressure is determined to be a blockage in the ink extraction pipeline, the first control module controls the liquid level sensor to feed back the ink shortage signal of the secondary ink cartridge to the ink return circulation pump and the negative pressure system, so that the ink return circulation pump and the negative pressure system stop working. The second control module is used to control the liquid level sensor to feed back a stop signal to the ink inlet circulation pump and send a power increase signal to the ink return circulation pump when it is determined that the cause of the unstable negative pressure is the poor ink return. This causes the ink inlet circulation pump to stop working and increases the power of the ink circulation. The detection module includes: a detection unit and a comparison unit; The detection unit is used to detect the real-time negative pressure fluctuation frequency on the negative pressure display. The comparison unit is used to compare the real-time negative pressure fluctuation frequency with the preset negative pressure fluctuation frequency. When the difference between the real-time negative pressure fluctuation frequency and the preset negative pressure fluctuation frequency exceeds a preset threshold, it is determined that an unstable negative pressure has occurred in the ink path.

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