Circulating ink supply control method and circulating ink supply control system

Abstract

The invention provides a circulating ink supply control method and a circulating ink supply control system, which are applied to a control unit in the circulating ink supply system. The method comprises the following steps: acquiring liquid level information detected by each liquid level sensor in an ink inlet unit and liquid level information detected by each liquid level sensor in an ink return unit in real time; according to the liquid level information detected by each sensor in the first sensor group, whether the circulating ink supply system is in a normal state is determined; if yes, the circulating pump or the air pump is controlled to conduct ink supply circulation according to the liquid level information detected by all the sensors in the second sensor set. The running speed of the circulating pump or the air pump is controlled through the liquid level information detected by all the liquid level sensors, it is guaranteed that the air pressure in the circulating ink supply system is stable, and therefore the ink supply amount of the spray head is stable, and the printing effect of a final model is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of printing control technology, and in particular to a circulating ink supply control method and a circulating ink supply control system. Background Art

[0002] Wax 3D printers are a type of additive manufacturing equipment. They spray liquid wax material heated at high temperature onto the printing platform, which then solidifies at room temperature. Models are built by stacking them layer by layer. They have the advantages of high precision and smooth surface and are widely used in jewelry, aerospace, engine and other manufacturing industries. Wax 3D printers are usually equipped with a nozzle circulation ink supply system that supports high-flow, high-temperature and high-viscosity phase change printing materials to achieve high-precision printing.

[0003] The nozzle circulating ink supply system in the prior art can usually only adjust the ink supply of the nozzle according to the printing effect of the final model. This causes the circulation pump to start and stop frequently, resulting in large fluctuations in the air pressure in the ink cartridge and unstable ink supply to the nozzle, affecting the printing effect of the final model. Summary of the invention

[0004] The purpose of the present application is to provide a circulating ink supply control method and a circulating ink supply control system to address the deficiencies in the above-mentioned prior art, so as to solve the problems in the prior art of large fluctuations in air pressure in the ink cartridge and unstable ink supply to the nozzle.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a circulating ink supply control method, which is applied to a control unit in a circulating ink supply system, wherein the circulating ink supply system at least includes: the control unit, an ink feed unit, an ink return unit, a circulating pump, and an air pump; the ink feed unit includes a plurality of liquid level sensors, and the ink return unit includes a plurality of liquid level sensors; the method includes:

[0007] Real-time acquisition of liquid level information detected by each liquid level sensor in the ink inlet unit and liquid level information detected by each liquid level sensor in the ink return unit;

[0008] Determine whether the ink circulation system is in a normal state according to the liquid level information detected by each sensor in the first sensor group, wherein the first sensor group includes two sensors in the ink return unit or two sensors in the ink supply unit;

[0009] If so, the circulation pump or the air pump is controlled to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group, wherein the second sensor group includes a sensor in the ink return unit and a sensor in the ink supply unit.

[0010] In a possible implementation, the first sensor group includes: a first liquid level sensor and a second liquid level sensor, wherein the first liquid level sensor is located above the second liquid level sensor;

[0011] The step of determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group includes:

[0012] If the liquid level height indicated by the liquid level information of the first liquid level sensor is greater than the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a first abnormal state;

[0013] If the liquid level height indicated by the liquid level information of the first liquid level sensor is equal to the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a second abnormal state;

[0014] If the liquid level height indicated by the liquid level information of the first liquid level sensor is less than the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a normal state.

[0015] In a possible implementation, the method further includes:

[0016] If the ink circulation system is in a first abnormal state, a first alarm instruction is sent to a host computer, wherein the first alarm instruction is used to indicate that an abnormality occurs in the second liquid level sensor;

[0017] If the circulating ink supply system is in the second abnormal state, a second alarm instruction is sent to the upper computer, where the second alarm instruction is used to indicate that an abnormality occurs in the target air pipe, and the target air pipe is the air pipe corresponding to the first sensor group.

[0018] In a possible implementation, the second sensor group includes: a third liquid level sensor located in the ink feed unit and a fourth liquid level sensor located in the ink return unit, and the third liquid level sensor and the fourth liquid level sensor are located at the same height;

[0019] The step of controlling the circulation pump or the air pump to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group comprises:

[0020] If the liquid level height indicated by the liquid level information of the third liquid level sensor is lower than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulating pump is controlled to increase the speed according to the preset speed parameter or the air pump is controlled to reduce the pressure difference according to the preset air pressure parameter.

[0021] In a possible implementation, controlling the circulation pump or the air pump to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group includes:

[0022] If the liquid level height indicated by the liquid level information of the third liquid level sensor is greater than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, control the circulation pump to reduce the speed according to a preset speed parameter or control the air pump to increase the pressure difference according to a preset air pressure parameter;

[0023] If the liquid level height indicated by the liquid level information of the third liquid level sensor is equal to the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulation pump is controlled to maintain the current rotation speed or the air pump is controlled to maintain the current air pressure parameter;

[0024] If neither the third liquid level sensor nor the fourth liquid level sensor detects the liquid level information, the circulation pump is controlled to stop supplying ink.

[0025] In a possible implementation, before determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group, the method further includes:

[0026] According to the liquid level information detected by the first target sensor in the ink return unit, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber.

[0027] In a possible implementation, controlling the circulation pump to rotate according to the liquid level information detected by the first target sensor in the ink return unit to supply ink to the ink inlet chamber includes:

[0028] If the liquid level height indicated by the liquid level information detected by the first target sensor in the ink return unit reaches a preset height, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber.

[0029] In a possible implementation, the method further includes:

[0030] The circulation pump is controlled to stop rotating according to the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink feed unit.

[0031] In a possible implementation, controlling the circulation pump to stop rotating according to the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink feed unit includes:

[0032] If the liquid level height indicated by the liquid level information detected by the first target sensor is equal to the liquid level height indicated by the liquid level information detected by the second target sensor, the circulation pump is controlled to stop rotating.

[0033] In a second aspect, another embodiment of the present application provides a circulating ink supply control system, the circulating ink supply control system comprising:

[0034] Control unit, ink inlet unit, ink return unit, circulation pump, pump ink inlet pipe, pump ink return pipe, air pump and nozzle assembly;

[0035] The ink feed unit includes a plurality of liquid level sensors, and the ink return unit includes a plurality of liquid level sensors;

[0036] The control unit is used in the steps of the circulating ink supply control method described in the first aspect.

[0037] The beneficial effects of the present application are as follows: the circulating ink supply control method provided in the embodiment of the present application is applied to a control unit in a circulating ink supply system, and by setting a plurality of liquid level sensors in the ink feed unit of the circulating ink supply system and a plurality of liquid level sensors in the ink return unit, the control unit can obtain in real time the liquid level information detected by each liquid level sensor in the ink feed unit and the liquid level information detected by each liquid level sensor in the ink return unit, and determine whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group, and when the circulating ink supply system is in a normal state, the circulating pump or the air pump is controlled to perform an ink supply cycle according to the liquid level information detected by each sensor in the second sensor group, thereby avoiding frequent starting and stopping of the circulating pump, so that the circulating pump can run continuously, and the running speed of the circulating pump or the air pump can be controlled by the liquid level information detected by each liquid level sensor, thereby ensuring the stability of the air pressure in the circulating ink supply system, thereby stabilizing the ink supply amount of the nozzle and ensuring the printing effect of the final model. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1A schematic structural diagram of a circulating ink supply system provided in an embodiment of the present application;

[0040] Figure 2 A schematic flow chart of a circulating ink supply control method provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of a flow chart for determining whether a circulating ink supply system is in a normal state in the circulating ink supply control method provided in an embodiment of the present application;

[0042] Figure 4 Another schematic flow chart of the circulating ink supply control method provided in the embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0045] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0046] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0047] The nozzle circulating ink supply system in the prior art can usually only adjust the ink supply of the nozzle according to the printing effect of the model. Specifically, when the printing effect of the model is unclear or there is uneven color, the circulation pump in the nozzle circulating ink supply system is controlled to speed up the circulation to increase the ink supply of the nozzle. When the printing effect of the model is too heavy, the circulation pump in the nozzle circulating ink supply system is controlled to slow down the circulation to reduce the ink supply of the nozzle.

[0048] However, this causes the circulation pump to start and stop frequently, resulting in large fluctuations in the air pressure in the ink cartridge and unstable ink supply to the nozzle, affecting the printing effect of the final model.

[0049] Based on the above-mentioned problems, an embodiment of the present application proposes a circulating ink supply control method, which is applied to a control unit in a circulating ink supply system. By setting multiple liquid level sensors in the ink feed unit of the circulating ink supply system and multiple liquid level sensors in the ink return unit, the control unit can obtain the liquid level information detected by each liquid level sensor in the ink feed unit and the liquid level information detected by each liquid level sensor in the ink return unit in real time, and determine whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group. When the circulating ink supply system is in a normal state, the circulating pump or the air pump is controlled to perform an ink supply cycle according to the liquid level information detected by each sensor in the second sensor group, so that the circulating pump can continue to operate, and the operation of the circulating pump or the air pump can be controlled by the liquid level information detected by each liquid level sensor, thereby ensuring the stability of the air pressure in the circulating ink supply system, thereby stabilizing the ink supply amount of the nozzle and ensuring the printing effect of the final model.

[0050] First, the structure of the circulating ink supply system provided in the embodiment of the present application is exemplarily described.

[0051] Figure 1 A schematic diagram of a structure of a circulating ink supply system provided in an embodiment of the present application, referring to Figure 1 As shown, the circulating ink supply system includes: a control unit (not shown in the figure), an ink supply unit, an ink return unit, a circulation pump 101, a pump ink supply tube 102, a pump ink return tube 103, an air pump (not shown in the figure), a nozzle assembly 104 and an ink cartridge cover assembly 116.

[0052] Optionally, continue to refer to Figure 1 As shown, the ink inlet unit includes multiple liquid level sensors, and the ink return unit includes multiple liquid level sensors. The liquid level sensors can be evenly distributed on the side walls of the inner cavity of the ink inlet unit and the side walls of the inner cavity of the ink return unit, and each liquid level sensor is communicatively connected to the control unit.

[0053] By way of example, the following description is made by taking the case where both the ink supply unit and the ink return unit include two liquid level sensors.

[0054] Optionally, the ink supply unit includes: an ink supply air pipe 105, an upper liquid level sensor 106 for the ink supply chamber, a lower liquid level sensor 107 for the ink supply chamber, an ink supply chamber 108, and a nozzle ink supply tube 109; the ink return unit includes: an ink return air pipe 110, an upper liquid level sensor 111 for the ink return chamber, a lower liquid level sensor 112 for the ink return chamber, an ink supply tube 113, an ink return chamber 114, and a nozzle ink return tube 115.

[0055] Optionally, the control unit is respectively communicated with the circulation pump 101, the upper liquid level sensor 106 and the lower liquid level sensor 107 of the ink inlet chamber in the ink inlet unit, and the upper liquid level sensor 111 and the lower liquid level sensor 112 of the ink return chamber in the ink return unit.

[0056] Optionally, continue to refer to Figure 1 As shown, one end of the pump ink return tube 103 is connected to the first end of the circulation pump 101, the other end of the pump ink return tube 103 is connected to the bottom of the inner cavity of the ink return cavity 114 in the ink return unit, one end of the pump ink inlet tube 102 is connected to the second end of the circulation pump 101, the other end of the pump ink inlet tube 102 is connected to the first position at the top of the inner cavity of the ink inlet cavity 108 in the ink inlet unit, the first end of the nozzle assembly 104 is connected to the nozzle ink inlet tube 109 of the ink inlet unit, the second end of the nozzle assembly 104 is connected to the nozzle ink return tube 115 of the ink return unit, and the air pump is connected to the ink inlet air tube 105 in the ink inlet unit.

[0057] Optionally, the upper liquid level sensor 106 of the ink inlet chamber and the lower liquid level sensor 107 of the ink inlet chamber are arranged on the side wall of the ink inlet chamber 108 at a preset interval, and the upper liquid level sensor 111 of the ink return chamber and the lower liquid level sensor 112 of the ink return chamber are arranged on the side wall of the ink return chamber 114 at a preset interval, wherein the preset interval can be adjusted according to the height of the ink inlet chamber and the ink return chamber side walls and the ink supply demand. Exemplarily, they can be evenly distributed at one-third and two-thirds of the side wall, or the upper liquid level sensor 106 of the ink inlet chamber and the upper liquid level sensor 111 of the ink return chamber can be arranged at one-third to one-half of the side wall, and the lower liquid level sensor 107 of the ink inlet chamber and the lower liquid level sensor 112 of the ink return chamber can be arranged at one-half to two-thirds of the side wall.

[0058] Optionally, the control unit can be a microcontroller unit (MCU), which is used to execute the steps of the circulating ink supply control method provided in the embodiment of the present application. Specifically, by executing the circulating ink supply control method provided in the embodiment of the present application, the ink supply cycle can be realized, that is, the operation of the circulating pump or the air pump is controlled by the control unit, so that the circulating pump 101 or the air pump, the pump ink inlet tube 102 and the pump ink return tube 103 draw the ink in the ink return chamber 114 into the ink inlet chamber 108, and inject the ink in the ink inlet chamber 108 into the nozzle assembly 104 through the nozzle ink inlet tube 109, and the excess ink is drawn into the ink return chamber 114 through the nozzle ink return tube 115, thereby realizing the ink supply cycle.

[0059] It can be understood that the circulating ink supply control system provided in the embodiment of the present application can be deployed in a printer for printing, wherein, when the circulating ink supply control system is deployed in the printer, the control unit in the circulating ink supply control system can also interact with the printing control device to ensure smooth printing, wherein the printing control device can include a host computer.

[0060] The following is a detailed description of the ink circulation control method provided in the embodiments of the present application in combination with multiple embodiments.

[0061] Figure 2 A schematic diagram of a flow chart of a circulating ink supply control method provided in an embodiment of the present application, referring to Figure 2 As shown, the execution subject of the method may be a control unit in the above-mentioned circulating ink supply system, and the method includes:

[0062] S201, acquiring in real time the liquid level information detected by each liquid level sensor in the ink inlet unit and the liquid level information detected by each liquid level sensor in the ink return unit.

[0063] It can be understood that after the circulating ink supply system starts working, each liquid level sensor in the ink inlet unit and each liquid level sensor in the ink return unit can continuously detect the liquid level information of the ink inlet chamber and the liquid level information of the ink return chamber, and send the detected liquid level information of the ink inlet chamber and the liquid level information of the ink return chamber to the control unit in the circulating ink supply control system.

[0064] Optionally, continue to refer to Figure 1As shown, taking the example of two liquid level sensors in the ink inlet unit and the ink return unit, the upper liquid level sensor 106 of the ink inlet chamber, the lower liquid level sensor 107 of the ink inlet chamber, the upper liquid level sensor 111 of the ink return chamber, and the lower liquid level sensor 112 of the ink return chamber respectively continuously detect the liquid level information of the ink inlet chamber and the liquid level information of the ink return chamber, and send the detected liquid level information to the control unit in the circulating ink supply control system. Among them, the liquid level information detected by each liquid level sensor in the ink inlet unit is used to indicate the height of the ink in the ink inlet chamber, and the liquid level information detected by each liquid level sensor in the ink return unit is used to indicate the height of the ink in the ink return chamber.

[0065] Exemplarily, the upper liquid level sensor 106 of the ink inlet chamber can perform real-time monitoring of whether the ink in the ink inlet chamber has reached the height where the upper liquid level sensor 106 of the ink inlet chamber is located; the lower liquid level sensor 107 of the ink inlet chamber can perform real-time monitoring of whether the ink in the ink inlet chamber has reached the height where the lower liquid level sensor 107 of the ink inlet chamber is located; the upper liquid level sensor 111 of the ink return chamber can perform real-time monitoring of whether the ink in the ink return chamber has reached the height where the upper liquid level sensor 111 of the ink return chamber is located; and the lower liquid level sensor 112 of the ink return chamber can perform real-time monitoring of whether the ink in the ink return chamber has reached the height where the lower liquid level sensor 112 of the ink return chamber is located.

[0066] Exemplarily, the upper liquid level sensor 106 of the ink inlet chamber can also monitor the height of the ink in the ink inlet chamber in real time, the lower liquid level sensor 107 of the ink inlet chamber can also monitor the height of the ink in the ink inlet chamber in real time, the upper liquid level sensor 111 of the ink return chamber can also monitor the height of the ink in the ink return chamber in real time, and the lower liquid level sensor 112 of the ink return chamber can also monitor the height of the ink in the ink return chamber in real time.

[0067] S202: Determine whether the circulating ink supply system is in a normal state based on the liquid level information detected by each sensor in the first sensor group.

[0068] It can be understood that the control unit in the circulating ink supply system can obtain the liquid level information of multiple liquid level sensors in the circulating ink supply system in real time. Since the positions of each liquid level sensor are different, it is possible to first determine whether the circulating ink supply system is in a normal working state based on the liquid level information detected by each liquid level sensor.

[0069] Optionally, after acquiring the liquid level information detected by each liquid level sensor, a first sensor group may be determined from each liquid level sensor, and based on the liquid level information detected by each sensor in the first sensor group, it may be determined whether the circulating ink supply system is in a normal state.

[0070] The first sensor group may be understood as a sensor combination consisting of liquid level sensors in the same chamber. Specifically, the first sensor group includes two sensors in the ink return unit or two sensors in the ink supply unit.

[0071] Exemplarily, taking the example of the upper liquid level sensor 106 of the ink inlet chamber and the lower liquid level sensor 106 of the ink inlet chamber respectively performing real-time detection of the height of the ink in the ink inlet chamber, the liquid level information detected by the upper liquid level sensor 106 of the ink inlet chamber and the liquid level information detected by the lower liquid level sensor 107 of the ink inlet chamber can be judged. If the liquid level information detected by the upper liquid level sensor 106 of the ink inlet chamber and the liquid level information detected by the lower liquid level sensor 107 of the ink inlet chamber are within the preset error range, it is determined that the circulating ink supply system is in a normal state.

[0072] S203: If yes, control the circulation pump or the air pump to circulate the ink according to the liquid level information detected by each sensor in the second sensor group.

[0073] Optionally, after determining that the circulating ink supply system is in normal working condition, a second sensor group can be determined from each liquid level sensor, and based on the liquid level information detected by each sensor in the second sensor group, the circulating pump or air pump can be controlled to perform ink circulation, so that the ink can circulate in the circulating ink supply system at a target circulation speed.

[0074] The second sensor group may be understood as a sensor combination consisting of liquid level sensors in different chambers. Specifically, the second sensor group includes a sensor in the ink return unit and a sensor in the ink supply unit.

[0075] Exemplarily, taking the liquid level sensor 106 on the ink inlet chamber detecting the height of the ink in the ink inlet chamber and the liquid level sensor 111 on the ink return chamber detecting the height of the ink in the ink return chamber as an example, if the liquid level height information indicated by the liquid level information detected by the liquid level sensor 106 on the ink inlet chamber is greater than the liquid level height information indicated by the liquid level information detected by the liquid level sensor 111 on the ink return chamber, the circulating pump can be controlled to supply ink at a slower speed or the air pump can be controlled to supply ink at a faster speed; if the liquid level height information indicated by the liquid level information detected by the liquid level sensor 106 on the ink inlet chamber is less than the liquid level height information indicated by the liquid level information detected by the liquid level sensor 111 on the ink return chamber, the circulating pump can be controlled to supply ink at a faster speed or the air pump can be controlled to supply ink at a slower speed.

[0076] Exemplarily, continuing with the example of the liquid level sensor 106 on the ink inlet chamber detecting the height of the ink in the ink inlet chamber and the liquid level sensor 111 on the ink return chamber detecting the height of the ink in the ink return chamber, if the liquid level height information indicated by the liquid level information detected by the liquid level sensor 106 on the ink inlet chamber is equal to the liquid level height information indicated by the liquid level information detected by the liquid level sensor 111 on the ink return chamber, the circulating pump or the air pump can be controlled to supply ink at a standard speed or a current speed; if neither the liquid level sensor 106 on the ink inlet chamber nor the liquid level sensor 111 on the ink return chamber detects the liquid level information, the circulating pump is controlled to stop working, and the ink supply pump is controlled to supply ink from the buffer chamber through the ink supply tube 113 to the ink return chamber 114.

[0077] The circulating ink supply control method provided in the embodiment of the present application is applied to a control unit in a circulating ink supply system. By setting multiple liquid level sensors in the ink feed unit of the circulating ink supply system and multiple liquid level sensors in the ink return unit, the control unit can obtain the liquid level information detected by each liquid level sensor in the ink feed unit and the liquid level information detected by each liquid level sensor in the ink return unit in real time, and determine whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group. When the circulating ink supply system is in a normal state, the circulating pump or the air pump is controlled to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group, thereby avoiding frequent starting and stopping of the circulating pump and allowing the circulating pump to run continuously. Moreover, the operating speed of the circulating pump or the air pump can be controlled according to the liquid level information detected by each liquid level sensor, thereby ensuring the stability of the air pressure in the circulating ink supply system, thereby stabilizing the ink supply amount of the nozzle and ensuring the printing effect of the final model.

[0078] In a possible implementation, the first sensor group includes: a first liquid level sensor and a second liquid level sensor, and the first liquid level sensor is located above the second liquid level sensor.

[0079] Optionally, continue to take the example that the ink inlet unit and the ink return unit each have two liquid level sensors, refer to Figure 1 As shown, the first sensor group may be two liquid level sensors in the ink feed unit, the first liquid level sensor may be the upper liquid level sensor 106 of the ink feed chamber, and the second liquid level sensor may be the lower liquid level sensor 107 of the ink feed chamber. The first sensor group may also be two liquid level sensors in the ink return unit, the first liquid level sensor may be the upper liquid level sensor 111 of the ink return chamber, and the second liquid level sensor may be the lower liquid level sensor 112 of the ink return chamber.

[0080] Optionally, the first liquid level sensor is used to monitor in real time whether the ink in the chamber where the first liquid level sensor is located reaches the height where the first liquid level sensor is located, and the second liquid level sensor is used to monitor in real time whether the ink in the chamber where the second liquid level sensor is located reaches the height where the second liquid level sensor is located.

[0081] Exemplarily, when the ink in the chamber where the first liquid level sensor is located reaches the height where the first liquid level sensor is located, the liquid level information detected by the first liquid level sensor may be 1; when the ink in the chamber where the first liquid level sensor is located does not reach the height where the first liquid level sensor is located, the liquid level information detected by the first liquid level sensor may be 0; when the ink in the chamber where the second liquid level sensor is located reaches the height where the second liquid level sensor is located, the liquid level information detected by the second liquid level sensor may be 1; when the ink in the chamber where the second liquid level sensor is located does not reach the height where the second liquid level sensor is located, the liquid level information detected by the second liquid level sensor may be 0.

[0082] In one possible implementation, Figure 3 A schematic diagram of a flow chart for determining whether a circulating ink supply system is in a normal state in a circulating ink supply control method provided in an embodiment of the present application, referring to Figure 3 As shown, in the above S202, determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group includes:

[0083] S301. If the liquid level height indicated by the liquid level information of the first liquid level sensor is greater than the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a first abnormal state.

[0084] Optionally, if the liquid level height indicated by the liquid level information of the first liquid level sensor is greater than the liquid level height indicated by the liquid level information of the second liquid level sensor, that is, the liquid level information of the first liquid level sensor is 1, and the liquid level information of the second liquid level sensor is 0, then it can be determined that there is a fault in the first liquid level sensor and the second liquid level sensor, and it is determined that the circulating ink supply system is in a first abnormal state, that is, a sensor failure state.

[0085] S302: If the liquid level height indicated by the liquid level information of the first liquid level sensor is equal to the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a second abnormal state.

[0086] Optionally, if the liquid level height indicated by the liquid level information of the first liquid level sensor is equal to the liquid level height indicated by the liquid level information of the second liquid level sensor, that is, the liquid level information of the first liquid level sensor is 1, and the liquid level information of the second liquid level sensor is 1, then it can be determined that there is no fault in the first liquid level sensor and the second liquid level sensor, but there is an ink ingress risk warning in the air pipe corresponding to the chamber where the first liquid level sensor and the second liquid level sensor are located, then it is determined that the circulating ink supply system is in the second abnormal state, that is, there is a risk of ink ingress in the air pipe.

[0087] S303: If the liquid level height indicated by the liquid level information of the first liquid level sensor is less than the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a normal state.

[0088] Optionally, if the liquid level height indicated by the liquid level information of the first liquid level sensor is greater than the liquid level height indicated by the liquid level information of the second liquid level sensor, that is, the liquid level information of the first liquid level sensor is 0, and the liquid level information of the second liquid level sensor is 1, then it can be determined that the circulating ink supply system is in a normal state.

[0089] By setting the first liquid level sensor above the second liquid level sensor, and determining whether the circulating ink supply system is in a normal working state based on the liquid level height indicated by the liquid level information of the first liquid level sensor and the liquid level height indicated by the liquid level information of the second liquid level sensor, the flow of ink and the operating status of the circulating ink supply system can be judged more accurately, which helps to reduce printing quality problems or damage to the printer equipment caused by the instability of the circulating ink supply system.

[0090] Figure 4 Another schematic flow chart of the circulating ink supply control method provided in an embodiment of the present application.

[0091] In one possible implementation, referring to Figure 4 As shown, the circulating ink supply control method provided in the embodiment of the present application also includes:

[0092] S401: If the circulating ink supply system is in a first abnormal state, a first alarm instruction is sent to a host computer.

[0093] Optionally, if the circulating ink supply system is in a first abnormal state, the control unit in the circulating ink supply system may send a first alarm instruction to a host computer to indicate that an abnormality occurs in the second liquid level sensor.

[0094] The first alarm instruction is used to indicate that an abnormality occurs in the second liquid level sensor.

[0095] S402: If the circulating ink supply system is in a second abnormal state, a second alarm instruction is sent to a host computer.

[0096] Optionally, if the circulating ink supply system is in a second abnormal state, the control unit in the circulating ink supply system may send a second alarm instruction to the host computer to indicate that an abnormality occurs in the target airway.

[0097] The second alarm instruction is used to indicate that an abnormality occurs in the target trachea, and the target trachea is the trachea corresponding to the first sensor group.

[0098] By sending corresponding alarm instructions to the host computer when an abnormality occurs in the circulating ink supply system, the host computer can be notified immediately so that relevant personnel can quickly learn of the abnormality of the circulating ink supply system, which helps to quickly take countermeasures, reduce the impact of the fault on the printing operation, help maintain the continuity and stability of printing, and reduce losses caused by downtime or failure.

[0099] In a possible implementation, the second sensor group includes: a third liquid level sensor located in the ink supply unit and a fourth liquid level sensor located in the ink return unit, and the third liquid level sensor and the fourth liquid level sensor are located at the same height.

[0100] Optionally, taking the third liquid level sensor being located in the ink inlet unit and the fourth liquid level sensor being located in the ink return unit as an example, refer to Figure 1 As shown, the second sensor group can be two liquid level sensors at the same height in the ink inlet unit and the ink return unit. When the third liquid level sensor is the upper liquid level sensor 106 of the ink inlet chamber, the fourth liquid level sensor can be the upper liquid level sensor 111 of the ink return chamber. When the third liquid level sensor is the lower liquid level sensor 107 of the ink inlet chamber, the fourth liquid level sensor can be the lower liquid level sensor 112 of the ink return chamber.

[0101] Optionally, the third liquid level sensor is used to monitor in real time whether the ink in the chamber where the third liquid level sensor is located reaches the height where the third liquid level sensor is located, and the fourth liquid level sensor is used to monitor in real time whether the ink in the chamber where the fourth liquid level sensor is located reaches the height where the fourth liquid level sensor is located.

[0102] Exemplarily, when the ink in the chamber where the third liquid level sensor is located reaches the height where the third liquid level sensor is located, the liquid level information detected by the third liquid level sensor may be 1; when the ink in the chamber where the third liquid level sensor is located does not reach the height where the third liquid level sensor is located, the liquid level information detected by the third liquid level sensor may be 0; when the ink in the chamber where the fourth liquid level sensor is located reaches the height where the fourth liquid level sensor is located, the liquid level information detected by the fourth liquid level sensor may be 1; when the ink in the chamber where the fourth liquid level sensor is located does not reach the height where the fourth liquid level sensor is located, the liquid level information detected by the fourth liquid level sensor may be 0.

[0103] In a possible implementation, in S203, according to the liquid level information detected by each sensor in the second sensor group, controlling the circulation pump or the air pump to circulate the ink includes:

[0104] If the liquid level height indicated by the liquid level information of the third liquid level sensor is lower than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulating pump is controlled to increase the speed according to the preset speed parameter or the air pump is controlled to reduce the pressure difference according to the preset air pressure parameter.

[0105] Optionally, taking the third liquid level sensor as the lower liquid level sensor 107 of the ink inlet chamber and the fourth liquid level sensor as the lower liquid level sensor 112 of the ink return chamber as an example, if the liquid level height indicated by the liquid level information of the third liquid level sensor is smaller than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, that is, the liquid level information of the third liquid level sensor is 0 and the liquid level information of the fourth liquid level sensor is 1, it can be determined that the amount of ink in the ink inlet chamber is smaller than the amount of ink in the ink return chamber. Then, the circulating pump can be controlled to increase the speed according to a preset speed parameter or the air pump can be controlled to reduce the pressure difference according to a preset air pressure parameter, so as to control the circulating pump or the air pump to increase the ink supply circulation speed based on the circulation speed of the existing ink supply circulation.

[0106] Exemplarily, the preset speed parameter can be 1%, that is, each time the speed is increased or decreased, the single change is ±1%. At the same time, the process of controlling the circulating pump or air pump to perform ink supply circulation can be periodically controlled according to the set period. For example: the ink supply cycle of the circulating pump or air pump is controlled every 30 seconds, so that the ink supply cycle of the circulating ink supply system can be dynamically adjusted in real time to achieve stable control of the ink supply process.

[0107] When the liquid level height indicated by the liquid level information of the third liquid level sensor is less than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, controlling the circulation pump to increase the speed according to the preset speed parameters or controlling the air pump to increase the pressure difference according to the preset air pressure parameters can improve the delivery capacity and overall efficiency of the circulating ink supply system, thereby helping to ensure the stability of the liquid level and thus ensure the stable operation of the circulating ink supply system.

[0108] In a possible implementation, in S203, according to the liquid level information detected by each sensor in the second sensor group, controlling the circulation pump or the air pump to circulate the ink includes:

[0109] If the liquid level height indicated by the liquid level information of the third liquid level sensor is greater than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulating pump is controlled to reduce the speed according to the preset speed parameter or the air pump is controlled to increase the pressure difference according to the preset air pressure parameter.

[0110] Optionally, taking the third liquid level sensor as the lower liquid level sensor 107 of the ink inlet chamber and the fourth liquid level sensor as the lower liquid level sensor 112 of the ink return chamber as an example, if the liquid level height indicated by the liquid level information of the third liquid level sensor is greater than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, that is, the liquid level information of the third liquid level sensor is 1 and the liquid level information of the fourth liquid level sensor is 0, it can be determined that the amount of ink in the ink inlet chamber is greater than the amount of ink in the ink return chamber. Then, the circulating pump can be controlled to reduce the speed according to the preset speed parameters or the air pump can be controlled to increase the pressure difference according to the preset air pressure parameters, so as to control the circulating pump or the air pump to reduce the circulation speed on the basis of the existing circulation speed of the ink supply circulation.

[0111] Exemplarily, the preset speed parameter can be 1%, that is, each time the speed is increased or decreased, the single change is ±1%. At the same time, the process of controlling the circulating pump or air pump to perform ink supply circulation can be periodically controlled according to the set period. For example: the ink supply cycle of the circulating pump or air pump is controlled every 30 seconds, so that the ink supply cycle of the circulating ink supply system can be dynamically adjusted in real time to achieve stable control of the ink supply process.

[0112] When the liquid level height indicated by the liquid level information of the third liquid level sensor is greater than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, controlling the circulation pump to reduce the speed according to the preset speed parameters or controlling the air pump to reduce the pressure difference according to the preset air pressure parameters can reduce the energy consumption of the circulation pump, reduce the friction and wear inside the circulation pump, extend its service life, and reduce maintenance costs. At the same time, it can also optimize the flow state of ink, reduce turbulence and eddy currents, and improve the delivery efficiency of the circulating ink supply system.

[0113] If the liquid level height indicated by the liquid level information of the third liquid level sensor is equal to the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulating pump is controlled to maintain the current rotation speed or the air pump is controlled to maintain the current air pressure parameter.

[0114] Optionally, taking the third liquid level sensor as the lower liquid level sensor 107 of the ink inlet chamber and the fourth liquid level sensor as the lower liquid level sensor 112 of the ink return chamber as an example, if the liquid level height indicated by the liquid level information of the third liquid level sensor is greater than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, that is, the liquid level information of the third liquid level sensor is 1 and the liquid level information of the fourth liquid level sensor is 1, it can be determined that the amount of ink in the ink inlet chamber is equal to the amount of ink in the ink return chamber, then, the circulating pump can be controlled to maintain the current rotation speed or the air pump can be controlled to maintain the current air pressure parameters to control the circulating pump or the air pump to maintain the circulation speed of the existing ink supply cycle.

[0115] If neither the third liquid level sensor nor the fourth liquid level sensor detects the liquid level information, the circulation pump is controlled to stop supplying ink.

[0116] Optionally, taking the third liquid level sensor as the lower liquid level sensor 107 for the ink inlet chamber and the fourth liquid level sensor as the lower liquid level sensor 112 for the ink return chamber as an example, if the third liquid level sensor and the fourth liquid level sensor detect no liquid level information, that is, the liquid level information of the third liquid level sensor is 0, and the liquid level information of the fourth liquid level sensor is 0, it can be determined that both the amount of ink in the ink inlet chamber and the amount of ink in the ink return chamber need to be added, then the circulating pump can be controlled to stop supplying ink and enter the ink supply process so that the circulating ink supply system can operate normally.

[0117] The above is an exemplary description of the circulating ink supply process in the circulating ink supply control method provided in the embodiment of the present application. Before starting the circulating ink supply, the circulating ink supply control method provided in the embodiment of the present application can also perform initial ink supply processing, which is exemplarily described below.

[0118] It can be understood that the circulating ink supply process can be understood as a processing process performed when the circulating ink supply system has enough ink to be used for printing, and the printer where the circulating ink supply system is located has completed preheating and other preparatory work to enter the printer's insulation state or printing state. The initial ink supply refers to the process of adding ink after the printer where the circulating ink supply system is located is preheated, so as to enter the circulating ink supply processing process after the ink adding is completed.

[0119] In a possible implementation, before determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group in S202, the method further includes:

[0120] According to the liquid level information detected by the first target sensor in the ink return unit, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber.

[0121] Optionally, continue to refer to Figure 1 As shown, during the initial ink supply process, the ink supply tube 113 can be connected to the ink bottle to supply ink. Specifically, the control unit sets the ink inlet air tube 105 and the ink return air tube 110 to the same negative pressure, for example, -3500Pa, through the air pump, and supplies ink to the ink return chamber 114 through the ink supply tube 113, and determines whether to supply ink to the ink inlet chamber through the liquid level information detected by the first target sensor in the ink return unit.

[0122] Optionally, the first target sensor in the ink return unit can be a liquid level sensor 112 at the bottom of the ink return chamber. When the control unit determines that the ink in the ink return chamber has met the ink adding demand based on the liquid level information detected by the liquid level sensor 112 at the bottom of the ink return chamber, it can control the circulation pump to rotate to supply ink to the ink inlet chamber.

[0123] Among them, the first target sensor can be the lower liquid level sensor 112 of the ink return chamber in the ink return unit.

[0124] The liquid level information detected by the first target sensor in the ink return unit is used to control the rotation of the circulation pump to supply ink to the ink inlet chamber. This can accurately monitor the liquid level of the ink return chamber and ensure precise control of the liquid level. At the same time, it realizes automatic control of the ink supply process and reduces the need for manual intervention. In addition, the coordinated use of the first target sensor and the circulation pump makes the initial ink supply process more intelligent and efficient.

[0125] In a possible implementation, the above steps include controlling the circulation pump to rotate according to the liquid level information detected by the first target sensor in the ink return unit to supply ink to the ink inlet chamber:

[0126] If the liquid level height indicated by the liquid level information detected by the first target sensor in the ink return unit reaches a preset height, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber.

[0127] Exemplarily, the control unit can determine that when the height of the ink in the ink return chamber meets the preset ink filling height based on the liquid level information detected by the liquid level sensor 112 under the ink return chamber, it controls the circulation pump to rotate to supply ink to the ink inlet chamber.

[0128] Exemplarily, when the liquid level information detected by the liquid level sensor 112 at the ink return chamber is 1, the control unit may control the circulation pump to rotate so as to supply ink to the ink inlet chamber.

[0129] When the liquid level indicated by the liquid level information detected by the first target sensor in the ink return unit reaches the preset height, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber, which can accurately monitor the liquid level of the ink return chamber and ensure accurate control of the liquid level. At the same time, the automatic control of the ink supply process is realized, reducing the need for manual intervention. In addition, the coordinated use of the first target sensor and the circulation pump makes the initial ink supply process more intelligent and efficient.

[0130] In a possible implementation, the circulating ink supply control method provided in the embodiment of the present application further includes:

[0131] The circulation pump is controlled to stop rotating according to the liquid level information detected by the first target sensor in the ink return unit and the liquid level information detected by the second target sensor in the ink supply unit.

[0132] Optionally, when the control unit determines that the ink in the ink return chamber has met the ink adding demand based on the liquid level information detected by the first target sensor in the ink return unit, i.e., the lower liquid level sensor 112 of the ink return chamber, it controls the circulating pump to rotate to supply ink to the ink inlet chamber. The control unit can determine whether the ink in the ink inlet chamber meets the ink adding demand based on the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink inlet unit. When the ink in the ink inlet chamber meets the ink adding demand, the circulating pump is controlled to stop rotating to complete the initial ink supply.

[0133] Among them, the second target sensor can be the lower liquid level sensor 106 of the ink inlet chamber.

[0134] By using the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink feed unit, the circulation pump is controlled to stop rotating, so that ink can be accurately added to the ink feed chamber to ensure precise control of the liquid level. At the same time, automatic control of the ink supply process is realized, reducing the need for manual intervention. In addition, the coordinated use of the first target sensor, the second target sensor and the circulation pump makes the initial ink supply process more intelligent and efficient.

[0135] In a possible implementation, the above steps, when controlling the circulation pump to stop rotating according to the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink feed unit, include:

[0136] If the liquid level height indicated by the liquid level information detected by the first target sensor is equal to the liquid level height indicated by the liquid level information detected by the second target sensor in the ink feed unit, the circulation pump is controlled to stop rotating.

[0137] Exemplarily, the control unit can judge the liquid level height indicated by the liquid level information detected by the first target sensor and the liquid level height indicated by the liquid level information detected by the second target sensor in the ink feed unit. If the liquid level height indicated by the liquid level information detected by the first target sensor is equal to the liquid level height indicated by the liquid level information detected by the second target sensor in the ink feed unit, that is, the liquid level information detected by the first target sensor is 1, and the liquid level information detected by the second target sensor is 1, it can be determined that the ink filling of the ink inlet chamber is completed, and the circulating pump is controlled to stop rotating.

[0138] When the liquid level height indicated by the liquid level information detected by the first target sensor is equal to the liquid level height indicated by the liquid level information detected by the second target sensor, the circulation pump is controlled to stop rotating, which can accurately control the amount of ink and prevent ink from overflowing from the ink return chamber or the ink inlet chamber, helping to keep the circulating ink supply system clean and operating normally, avoiding ink waste and environmental pollution, and at the same time, helping to improve the stability of the circulating ink supply system.

[0139] Based on the same inventive concept, the present application also provides a circulating ink supply system for executing the above-mentioned circulating ink supply control method. The structure of the circulating ink supply system can be seen in the above-mentioned Figure 1 , the repeated parts will not be repeated.

[0140] The present application also provides an electronic device, such as Figure 5 As shown, Figure 5 The structural diagram of the electronic device provided in the embodiment of the present application includes: a processor 501, a memory 502, and optionally, a bus 503. The memory 502 stores machine-readable instructions executable by the processor 501. When the electronic device 500 is running, the processor 501 communicates with the memory 502 through the bus 503. When the machine-readable instructions are executed by the processor 501, the steps of the above-mentioned circulating ink supply control method are executed.

[0141] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned power consumption prediction method are executed.

[0142] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0143] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the function is implemented in the form of 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 is essentially or part of the technical solution that contributes to the prior art or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program code.

[0144] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A circulating ink supply control method, characterized in that: A control unit applied to a circulating ink supply system, wherein the circulating ink supply system at least comprises: the control unit, an ink feed unit, an ink return unit, a circulation pump and an air pump; the ink feed unit comprises a plurality of liquid level sensors, and the ink return unit comprises a plurality of liquid level sensors; the method comprises: Real-time acquisition of liquid level information detected by each liquid level sensor in the ink inlet unit and liquid level information detected by each liquid level sensor in the ink return unit; Determine whether the ink circulation system is in a normal state according to the liquid level information detected by each sensor in the first sensor group, wherein the first sensor group includes two sensors in the ink return unit or two sensors in the ink supply unit; If so, the circulation pump or the air pump is controlled to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group, wherein the second sensor group includes a sensor in the ink return unit and a sensor in the ink supply unit.

2. The circulating ink supply control method according to claim 1, characterized in that: The first sensor group includes: a first liquid level sensor and a second liquid level sensor, wherein the first liquid level sensor is located above the second liquid level sensor; The step of determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group includes: If the liquid level height indicated by the liquid level information of the first liquid level sensor is greater than the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a first abnormal state; If the liquid level height indicated by the liquid level information of the first liquid level sensor is equal to the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a second abnormal state; If the liquid level height indicated by the liquid level information of the first liquid level sensor is less than the liquid level height indicated by the liquid level information of the second liquid level sensor, it is determined that the circulating ink supply system is in a normal state.

3. The circulating ink supply control method according to claim 2, characterized in that: The method further comprises: If the ink circulation system is in a first abnormal state, a first alarm instruction is sent to a host computer, wherein the first alarm instruction is used to indicate that an abnormality occurs in the second liquid level sensor; If the circulating ink supply system is in the second abnormal state, a second alarm instruction is sent to the upper computer, where the second alarm instruction is used to indicate that an abnormality occurs in the target air pipe, and the target air pipe is the air pipe corresponding to the first sensor group.

4. The circulating ink supply control method according to claim 1, characterized in that: The second sensor group includes: a third liquid level sensor located in the ink inlet unit and a fourth liquid level sensor located in the ink return unit, and the third liquid level sensor and the fourth liquid level sensor are located at the same height; The step of controlling the circulation pump or the air pump to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group comprises: If the liquid level height indicated by the liquid level information of the third liquid level sensor is lower than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulating pump is controlled to increase the speed according to the preset speed parameter or the air pump is controlled to reduce the pressure difference according to the preset air pressure parameter.

5. The circulating ink supply control method according to claim 4, characterized in that: The step of controlling the circulation pump or the air pump to perform ink supply circulation according to the liquid level information detected by each sensor in the second sensor group comprises: If the liquid level height indicated by the liquid level information of the third liquid level sensor is greater than the liquid level height indicated by the liquid level information of the fourth liquid level sensor, control the circulation pump to reduce the speed according to a preset speed parameter or control the air pump to increase the pressure difference according to a preset air pressure parameter; If the liquid level height indicated by the liquid level information of the third liquid level sensor is equal to the liquid level height indicated by the liquid level information of the fourth liquid level sensor, the circulation pump is controlled to maintain the current rotation speed or the air pump is controlled to maintain the current air pressure parameter; If neither the third liquid level sensor nor the fourth liquid level sensor detects the liquid level information, the circulation pump is controlled to stop supplying ink.

6. The circulating ink supply control method according to claim 1, characterized in that: Before determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in the first sensor group, the method further includes: According to the liquid level information detected by the first target sensor in the ink return unit, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber.

7. The circulating ink supply control method according to claim 6, characterized in that: According to the liquid level information detected by the first target sensor in the ink return unit, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber, comprising: If the liquid level height indicated by the liquid level information detected by the first target sensor in the ink return unit reaches a preset height, the circulation pump is controlled to rotate to supply ink to the ink inlet chamber.

8. The circulating ink supply control method according to claim 6, characterized in that: The method further comprises: The circulation pump is controlled to stop rotating according to the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink feed unit.

9. The circulating ink supply control method according to claim 8, characterized in that: The step of controlling the circulation pump to stop rotating according to the liquid level information detected by the first target sensor and the liquid level information detected by the second target sensor in the ink feed unit comprises: If the liquid level height indicated by the liquid level information detected by the first target sensor is equal to the liquid level height indicated by the liquid level information detected by the second target sensor, the circulation pump is controlled to stop rotating.

10. A circulating ink supply control system, characterized in that: include: Control unit, ink inlet unit, ink return unit, circulation pump, pump ink inlet pipe, pump ink return pipe, air pump and nozzle assembly; The ink feed unit includes a plurality of liquid level sensors, and the ink return unit includes a plurality of liquid level sensors; The control unit is used to execute the steps of the circulating ink supply control method according to any one of claims 1 to 9.

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