Circulating ink supply control method and circulating ink supply control system

Abstract

The application provides a circulating ink supply control method and a circulating ink supply control system, which are applied to a control unit in a 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; determining whether the circulating ink supply system is in a normal state according to the liquid level information detected by each sensor in a first sensor group; if yes, controlling a circulating pump or an air pump to supply ink according to the liquid level information detected by each sensor in a second sensor group. The application controls the running speed of the circulating pump or the air pump according to the liquid level information detected by each liquid level sensor, ensures the stability of air pressure in the circulating ink supply system, and thus ensures the stability of ink supply of the nozzle and the printing effect of the final model.

Description

TECHNICAL FIELD

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

[0002] A wax 3D printer belongs to one kind of additive manufacturing equipment. A wax material in liquid state after high-temperature heating is sprayed to a printing platform. The wax material is then solidified in solid state at normal temperature. A model is built through layer-by-layer stacking. The wax 3D printer has advantages of high precision and smooth surface and is widely applied to manufacturing industries such as jewelry, aerospace and engine. A nozzle circulating ink supply system supporting high-flow, high-temperature and high-viscosity phase-change printing materials is usually arranged in the wax 3D printer to realize high-precision printing.

[0003] The nozzle circulating ink supply system in the prior art can only adjust the ink supply amount of the nozzle according to the printing effect of the final model. This causes frequent start and stop of the circulating pump, large fluctuation of air pressure in the ink cartridge, unstable ink supply amount of the nozzle and influence on the printing effect of the final model. SUMMARY

[0004] The present application aims at the deficiencies in the prior art and provides a circulating ink supply control method and a circulating ink supply control system to solve the problems of large fluctuation of air pressure in the ink cartridge and unstable ink supply amount of the nozzle in the prior art.

[0005] To achieve the above object, the technical solutions adopted by the embodiments of the present application are as follows.

[0006] In a first aspect, an embodiment of the present application provides a circulating ink supply control method applied to a control unit in a circulating ink supply system. The circulating ink supply system at least includes the control unit, an ink inlet unit, an ink return unit, a circulating pump and an air pump. The ink inlet unit includes a plurality of liquid level sensors. The ink return unit includes a plurality of liquid level sensors. The method includes the following steps.

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

[0009] If yes, the ink circulation pump or the air pump is controlled to perform ink circulation according to liquid level information detected by each sensor in the second sensor group, wherein the second sensor group comprises one sensor in the ink return unit and one sensor in the ink inlet unit.

[0010] In a possible implementation, the first sensor group comprises 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 determination of whether the circulation ink supply system is in a normal state according to liquid level information detected by each sensor in the first sensor group comprises:

[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 circulation 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 circulation 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 circulation ink supply system is in a normal state.

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

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

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

[0018] In a possible implementation, the second sensor group comprises a third liquid level sensor located at the ink inlet unit and a fourth liquid level sensor located at the ink return unit, and the third liquid level sensor and the fourth liquid level sensor are located at the same height.

[0019] The control of the ink circulation pump or the air pump to perform ink circulation according to 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 less 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 rotating speed according to a preset rotating speed parameter or the air pump is controlled to decrease the pressure difference according to a preset air pressure parameter.

[0021] In a possible implementation, the controlling the circulating pump or the air pump to circulate ink according to the liquid level information detected by each sensor in the second sensor group comprises:

[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, the circulating pump is controlled to decrease the rotating speed according to a preset rotating speed parameter or the air pump is controlled 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 circulating pump is controlled to keep the current rotating speed or the air pump is controlled to keep the current air pressure parameter.

[0024] If the liquid level information of neither the third liquid level sensor nor the fourth liquid level sensor is detected, the circulating pump is controlled to stop circulating ink.

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

[0026] controlling the circulating pump to rotate to supply ink to the ink inlet cavity according to the liquid level information detected by the first target sensor in the ink returning unit.

[0027] In a possible implementation, the controlling the circulating pump to rotate to supply ink to the ink inlet cavity according to the liquid level information detected by the first target sensor in the ink returning unit comprises:

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

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

[0030] controlling the circulating 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 inlet unit.

[0031] In a possible implementation, the step of controlling the circulating 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 inlet unit comprises:

[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 circulating pump is controlled to stop rotating.

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

[0034] a control unit, an ink inlet unit, an ink return unit, a circulating pump, a pump ink inlet pipe, a pump ink return pipe, an air pump, and a nozzle assembly;

[0035] the ink inlet unit comprises a plurality of liquid level sensors, and the ink return unit comprises a plurality of liquid level sensors;

[0036] the control unit is configured to perform the steps of the circulating ink supply control method of the first aspect.

[0037] The circulating ink supply control method provided by the embodiments of the present application is applied to a control unit in a circulating ink supply system, a plurality of liquid level sensors are arranged in an ink inlet unit of the circulating ink supply system, and a plurality of liquid level sensors are arranged in an ink return unit, so that the control unit can acquire 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 in real time, determine whether the circulating ink supply system is in a normal state according to liquid level information detected by each sensor in a first sensor group, and control the circulating pump or the air pump to perform ink circulation according to liquid level information detected by each sensor in a second sensor group when the circulating ink supply system is in the normal state, thereby avoiding frequent starting and stopping of the circulating pump, enabling the circulating pump to continuously operate, and enabling the operating speed of the circulating pump or the air pump to be controlled according to the liquid level information detected by the liquid level sensors, so as to stabilize 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 DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

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

[0040] Figure 2 A flowchart of a circulating ink supply control method provided by an embodiment of the present application;

[0041] Figure 3 A flowchart of determining whether the circulating ink supply system is in a normal state in a circulating ink supply control method provided by an embodiment of the present application;

[0042] Figure 4 Another flowchart of a circulating ink supply control method provided by an embodiment of the present application;

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

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be 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 are only intended to illustrate and describe the present application, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowcharts show the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts by those skilled in the art under the guidance of the content of the present application.

[0045] In addition, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different 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 claimed present application, but only represents 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 creative labor are within 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 presence of the features declared thereafter, but does not exclude the addition of other features.

[0047] The existing technology of the nozzle circulating ink supply system can only adjust the ink supply amount of the nozzle according to the printing effect of the model. Specifically, when the printing effect of the model is unclear or there is color unevenness, the circulating pump in the nozzle circulating ink supply system is controlled to speed up circulation to increase the ink supply amount of the nozzle; when the printing effect of the model is too thick, the circulating pump in the nozzle circulating ink supply system is controlled to slow down circulation to reduce the ink supply amount of the nozzle.

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

[0049] Based on the above problems, the embodiment of the present application proposes a circulating ink supply control method applied to a control unit in a circulating ink supply system. Multiple liquid level sensors are arranged in the ink inlet unit and the ink return unit of the circulating ink supply system, so that the control unit can obtain 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 in real time. According to the liquid level information detected by each sensor in the first sensor group, it is determined whether the circulating ink supply system is in a normal state. When the circulating ink supply system is in a normal state, according to the liquid level information detected by each sensor in the second sensor group, the circulating pump or the air pump is controlled to perform ink circulation, so that the circulating pump can continuously 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, ensuring the stability of the air pressure in the circulating ink supply system, so that the ink supply amount of the nozzle is stable, and the printing effect of the final model is ensured.

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

[0051] Figure 1 A structure diagram of the circulating ink supply system provided by the embodiment of the present application is shown in Figure 1 The circulating ink supply system includes a control unit (not shown in the figure), an ink inlet unit, an ink return unit, a circulating pump 101, a pump ink inlet pipe 102, a pump ink return pipe 103, an air pump (not shown in the figure), a nozzle assembly 104, and an ink cartridge upper cover assembly 116.

[0052] Optionally, referring to Figure 1 The ink inlet unit includes multiple liquid level sensors, and the ink return unit includes multiple liquid level sensors. Each liquid level sensor can be uniformly distributed on the side wall of the inner cavity of the ink inlet unit and the side wall of the inner cavity of the ink return unit, and each liquid level sensor is in communication connection with the control unit.

[0053] Exemplarily, the following takes the ink inlet unit and the ink return unit each including two liquid level sensors as an example for description.

[0054] Optionally, the ink feeding unit comprises an ink feeding air pipe 105, an upper ink level sensor 106, a lower ink level sensor 107, an ink feeding cavity 108, and an ink head ink feeding pipe 109; and the ink returning unit comprises an ink returning air pipe 110, an upper ink level sensor 111, a lower ink level sensor 112, an ink supply pipe 113, an ink returning cavity 114, and an ink head ink returning pipe 115.

[0055] Optionally, the control unit is communicatively connected with the circulating pump 101, the upper ink level sensor 106 and the lower ink level sensor 107 in the ink feeding unit, and the upper ink level sensor 111 and the lower ink level sensor 112 in the ink returning unit, respectively.

[0056] Optionally, continuing to refer to Figure 1 Optionally, one end of the pump ink returning pipe 103 is connected with the first end of the circulating pump 101, the other end of the pump ink returning pipe 103 is connected with the bottom of the inner cavity of the ink returning cavity 114 in the ink returning unit, one end of the pump ink feeding pipe 102 is connected with the second end of the circulating pump 101, the other end of the pump ink feeding pipe 102 is connected with the first position of the top of the inner cavity of the ink feeding cavity 108 in the ink feeding unit, the first end of the ink head assembly 104 is connected with the ink head ink feeding pipe 109 of the ink feeding unit, the second end of the ink head assembly 104 is connected with the ink head ink returning pipe 115 of the ink returning unit, and the air pump is connected with the ink feeding air pipe 105 in the ink feeding unit.

[0057] Optionally, the upper ink level sensor 106 and the lower ink level sensor 107 are arranged on the side wall of the ink feeding cavity 108 according to a preset interval, and the upper ink level sensor 111 and the lower ink level sensor 112 are arranged on the side wall of the ink returning cavity 114 according to a preset interval, wherein the preset interval can be adjusted according to the height of the side wall of the ink feeding cavity and the ink returning cavity and the requirement of ink supply, and for example, the upper ink level sensor 106 and the lower ink level sensor 107 can be uniformly distributed on the one-third position and the two-thirds position of the side wall, or the upper ink level sensor 106 and the lower ink level sensor 107 can be arranged in the one-third position to the one-half position of the side wall, and the upper ink level sensor 111 and the lower ink level sensor 112 can be arranged in the one-half position to the two-thirds position of the side wall.

[0058] Optionally, the control unit can be a micro control unit (MCU), and the control unit is configured to execute the steps of the ink circulation control method provided in the embodiments of the present application. Specifically, by executing the ink circulation control method provided in the embodiments of the present application, the ink circulation can be realized, i.e., by controlling the operation of the circulation pump or the air pump by the control unit, the circulation pump 101 or the air pump, the ink inlet pipe 102 and the ink return pipe 103 can extract the ink in the ink return cavity 114 to the ink inlet cavity 108, and inject the ink in the ink inlet cavity 108 to the inkjet head assembly 104 through the inkjet head inlet pipe 109, and extract the excess ink into the ink return cavity 114 through the inkjet head return pipe 115, so as to realize the ink circulation.

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

[0060] The ink circulation control method provided in the embodiments of the present application will be described in detail below in combination with multiple embodiments.

[0061] Figure 2 A flowchart of the ink circulation control method provided in the embodiments of the present application is shown in FIG. 1. The execution subject of the method can be the control unit in the ink circulation system as described above. The method includes the following steps. Figure 2

[0062] S201, real-time acquisition of 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 ink circulation system starts to work, 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 cavity and the liquid level information of the ink return cavity, and send the detected liquid level information of the ink inlet cavity and the liquid level information of the ink return cavity to the control unit in the ink circulation control system.

[0064] Optionally, continuing to refer to FIG. 1, the method further includes the following steps. Figure 1 ​As shown, taking the example of two liquid level sensors in the ink inlet unit and the ink return unit, the upper ink chamber liquid level sensor 106, the lower ink chamber liquid level sensor 107, the upper ink return chamber liquid level sensor 111, and the lower ink return chamber liquid level sensor 112 continuously detect the liquid level information of the ink chamber and the liquid level information of the ink return chamber respectively, and send the detected liquid level information to the control unit in the circulating ink supply control system. The liquid level information detected by the liquid level sensors in the ink inlet unit is used to indicate the height of the ink in the ink chamber, and the liquid level information detected by the liquid level sensors in the ink return unit is used to indicate the height of the ink in the ink return chamber.

[0065] For example, the upper ink chamber liquid level sensor 106 can monitor in real time whether the ink in the ink chamber reaches the height at which the upper ink chamber liquid level sensor 106 is located, the lower ink chamber liquid level sensor 107 can monitor in real time whether the ink in the ink chamber reaches the height at which the lower ink chamber liquid level sensor 107 is located, the upper ink return chamber liquid level sensor 111 can monitor in real time whether the ink in the ink return chamber reaches the height at which the upper ink return chamber liquid level sensor 111 is located, and the lower ink return chamber liquid level sensor 112 can monitor in real time whether the ink in the ink return chamber reaches the height at which the lower ink return chamber liquid level sensor 112 is located.

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

[0067] S202, according to the liquid level information detected by each sensor in the first sensor group, determine whether the circulating ink supply system is in a normal state.

[0068] It can be understood that the control unit in the circulating ink supply system can obtain the liquid level information of the multiple liquid level sensors in the circulating ink supply system in real time, and since the positions of the liquid level sensors are different, the circulating ink supply system can be determined to be in a normal working state according to the liquid level information detected by each liquid level sensor.

[0069] Alternatively, after obtaining the liquid level information detected by each liquid level sensor, the first sensor group can be determined from the liquid level sensors, and whether the circulating ink supply system is in a normal state can be determined according to the liquid level information detected by each sensor in the first sensor group.

[0070] The first sensor group can be understood as a sensor combination composed 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 inlet unit.

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

[0072] S203, if yes, the circulating pump or the air pump is controlled to circulate the ink according to the liquid level information detected by the sensors in the second sensor group.

[0073] Optionally, after it is determined that the circulating ink supply system is in a normal working state, the second sensor group can be determined from the liquid level sensors, and the circulating pump or the air pump is controlled to circulate the ink according to the liquid level information detected by the sensors in the second sensor group, so that the ink can circulate in the circulating ink supply system at a target circulating speed.

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

[0075] For example, the ink inlet chamber upper liquid level sensor 106 can be used to detect the height of the ink in the ink inlet chamber, and the ink return chamber upper liquid level sensor 111 can be used to detect 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 ink inlet chamber upper liquid level sensor 106 is greater than the liquid level height information indicated by the liquid level information detected by the ink return chamber upper liquid level sensor 111, the circulating pump can be controlled to circulate the ink at a slower speed or the air pump can be controlled to circulate the ink at a faster speed. If the liquid level height information indicated by the liquid level information detected by the ink inlet chamber upper liquid level sensor 106 is less than the liquid level height information indicated by the liquid level information detected by the ink return chamber upper liquid level sensor 111, the circulating pump can be controlled to circulate the ink at a faster speed or the air pump can be controlled to circulate the ink at a slower speed.

[0076] For example, continuing to take the detection of the ink height in the ink inlet chamber by the liquid level sensor 106 on the ink inlet chamber and the detection of the ink height in the ink return chamber by the liquid level sensor 111 on the ink return chamber as examples, 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 circulation pump or air pump can be controlled to perform ink supply circulation at the standard speed or the 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 liquid level information, the circulation pump is controlled to stop working, and the ink supply pump is controlled to supply ink from the buffer chamber through the ink supply pipe 113 to the ink return chamber 114.

[0077] The circulating ink supply control method provided in this application is applied to the control unit of a circulating ink supply system. By setting multiple liquid level sensors in the ink inlet unit and multiple liquid level sensors in the ink return unit of the circulating ink supply system, the control unit can acquire 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 in real time. Based on the liquid level information detected by each sensor in the first sensor group, it determines whether the circulating ink supply system is in a normal state. When the circulating ink supply system is in a normal state, it controls the circulating pump or air pump to circulate ink based on the liquid level information detected by each sensor in the second sensor group. This avoids frequent start and stop of the circulating pump, allowing the circulating pump to run continuously. Furthermore, the operating speed of the circulating pump or air pump can be controlled by the liquid level information detected by each liquid level sensor, ensuring stable air pressure in the circulating ink supply system, thereby ensuring stable ink supply to the printhead and guaranteeing the final printing effect of the model.

[0078] In one possible implementation, the first sensor group includes a first liquid level sensor and a second liquid level sensor, with the first liquid level sensor positioned above the second liquid level sensor.

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

[0080] Optionally, the first liquid level sensor is configured to monitor 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 in real time, and the second liquid level sensor is configured to monitor 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 in real time.

[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 can be 1, and 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 can 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 can be 1, and 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 can be 0.

[0082] In a possible implementation manner, Figure 3 A flowchart for determining whether the circulating ink supply system is in a normal state in the circulating ink supply control method provided by the embodiments of the present application is shown in FIG. 2, and the determination of 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 includes the following steps. Figure 3

[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, it is determined that the first liquid level sensor and the second liquid level sensor have a fault, and it is determined that the circulating ink supply system is in a first abnormal state, that is, a sensor fault 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, it can be determined that the first liquid level sensor and the second liquid level sensor do not have faults, but the chamber corresponding to the first liquid level sensor and the second liquid level sensor has an ink feeding risk warning, and it is determined that the circulating ink supply system is in the second abnormal state, that is, the air pipe has an ink feeding risk.

[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, it can be determined that the circulating ink supply system is in a normal state.

[0089] By arranging 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 according to 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 running state of the circulating ink supply system can be more accurately judged, which helps to reduce the printing quality problems or printer equipment damage caused by the instability of the circulating ink supply system.

[0090] Figure 4 Another flowchart of the circulating ink supply control method provided by the embodiment of the application.

[0091] In a possible implementation manner, referring to FIG. 1, Figure 4 The circulating ink supply control method provided by the embodiment of the application further includes:

[0092] S401, if the circulating ink supply system is in a first abnormal state, a first alarm instruction is sent to an upper computer.

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

[0094] The first alarm instruction is used to indicate that the second liquid level sensor is abnormal.

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

[0096] Optionally, if the circulating ink supply system is in a second abnormal state, the control unit in the circulating ink supply system can send a second alarm command to the host computer to indicate that the target air pipe is abnormal.

[0097] The second alarm command is used to indicate that an abnormality has occurred in the target trachea, which is the trachea corresponding to the first sensor group.

[0098] When an abnormality occurs in the circulating ink supply system, a corresponding alarm command is sent to the host computer, which can immediately notify the host computer. This allows relevant personnel to quickly learn about the abnormality in the circulating ink supply system, which helps to take quick countermeasures, reduce the impact of the failure on printing operations, help maintain the continuity and stability of printing, and reduce losses caused by downtime or failure.

[0099] In one possible implementation, 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, with the third and fourth liquid level sensors at the same height.

[0100] Optionally, taking the example of 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, 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 has reached the height of the third liquid level sensor, 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 has reached the height of the fourth liquid level sensor.

[0102] For example, 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 can 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 can 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 can 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 can be 0.

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

[0104] If 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, the circulating pump is controlled to increase the rotating speed according to a preset rotating speed parameter, or the air pump is controlled to decrease the pressure difference according to a preset air pressure parameter.

[0105] Optionally, taking the third liquid level sensor as the ink inlet cavity lower liquid level sensor 107 and the fourth liquid level sensor as the ink return cavity lower liquid level sensor 112 as an example, if 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, 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 ink amount in the ink inlet cavity is less than the ink amount in the ink return cavity, and then the circulating pump can be controlled to increase the rotating speed according to a preset rotating speed parameter, or the air pump can be controlled to decrease the pressure difference according to a preset air pressure parameter, so as to increase the ink supply circulation speed of the circulating pump or the air pump on the basis of the existing ink supply circulation speed.

[0106] For example, the preset rotating speed parameter can be 1%, that is, the speed is increased or decreased by ±1% each time, and meanwhile, the process of controlling the circulating pump or the air pump to perform the ink supply circulation can be periodically controlled according to a set period, for example, the ink supply circulation of the circulating pump or the air pump is controlled every 30 seconds, so that the ink supply circulation of the circulating ink supply system can be dynamically and real-timely adjusted, and stable control of the ink supply process can be realized.

[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, the circulating pump is controlled to increase the rotating speed according to a preset rotating speed parameter, or the air pump is controlled to increase the pressure difference according to a preset air pressure parameter, which 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 the stable operation of the circulating ink supply system.

[0108] In a possible implementation, the control of the circulating pump or the air pump to perform the ink supply circulation according to the liquid level information detected by each sensor in the second sensor group in S203 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 decrease the rotating speed according to a preset rotating speed parameter, or the air pump is controlled to increase the pressure difference according to a preset air pressure parameter.

[0110] Optionally, taking the third liquid level sensor as the ink inlet cavity lower liquid level sensor 107 and the fourth liquid level sensor as the ink return cavity lower liquid level sensor 112 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 ink amount in the ink inlet cavity is greater than the ink amount in the ink return cavity, and then the rotation speed of the circulating pump can be controlled to decrease according to the preset rotation speed parameter or the pressure difference of the air pump can be controlled to increase according to the preset air pressure parameter, so as to control the circulating pump or the air pump to decrease the circulation speed on the basis of the existing ink supply circulation speed.

[0111] For example, the preset rotation speed parameter can be 1%, that is, the speed is increased or decreased by ±1% each time, and at the same time, the process of controlling the circulating pump or the air pump to supply ink can be periodically controlled according to a set period, for example, the ink supply circulation of the circulating pump or the air pump is controlled every 30 seconds, so that the ink supply circulation of the circulating ink supply system can be dynamically and real-timely adjusted, and stable control of the ink supply process can be realized.

[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, the rotation speed of the circulating pump is controlled to decrease according to the preset rotation speed parameter or the pressure difference of the air pump is controlled to decrease according to the preset air pressure parameter, which can reduce the energy consumption of the circulating pump, reduce the friction and wear inside the circulating pump, prolong the service life of the circulating pump, reduce the maintenance cost, and at the same time, can optimize the flow state of the ink, reduce the turbulent flow and vortex flow, and improve the conveying 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 current rotation speed of the circulating pump is maintained or the current air pressure parameter of the air pump is maintained.

[0114] Optionally, taking the third liquid level sensor as the ink inlet cavity lower liquid level sensor 107 and the fourth liquid level sensor as the ink return cavity lower liquid level sensor 112 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 ink amount in the ink inlet cavity is equal to the ink amount in the ink return cavity, and then the current rotation speed of the circulating pump can be controlled to be maintained or the current air pressure parameter of the air pump can be controlled to be maintained, so as to control the circulating pump or the air pump to maintain the existing ink supply circulation speed.

[0115] If the liquid level information of the third liquid level sensor and the liquid level information of the fourth liquid level sensor are not detected, the circulating pump is controlled to stop supplying ink.

[0116] Optionally, taking the third liquid level sensor as the ink inlet cavity lower liquid level sensor 107 and the fourth liquid level sensor as the ink return cavity lower liquid level sensor 112 as an example, if neither the third liquid level sensor nor the fourth liquid level sensor detects liquid level information, i.e., 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 the ink amount in the ink inlet cavity and the ink amount in the ink return cavity both need to be added, and then the circulating pump can be controlled to stop ink supply and enter the ink supply process to enable the circulating ink supply system to normally operate.

[0117] The process of the circulating ink supply in the circulating ink supply control method provided by the embodiments of the present application is exemplarily described above. Before the circulating ink supply starts, the initial ink supply process can also be performed in the circulating ink supply control method provided by the embodiments of the present application, which is exemplarily described below.

[0118] It can be understood that the process of the circulating ink supply 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 in which the circulating ink supply system is located has completed the preparation work such as preheating and enters the printer heat preservation state or printing state. The initial ink supply refers to ink addition after the preheating of the printer in which the circulating ink supply system is located is completed, so as to enter the processing process of the circulating ink supply after the ink addition is completed.

[0119] In a possible implementation, before the determination of whether the circulating ink supply system is in the 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 circulating pump is controlled to rotate to supply ink to the ink inlet cavity.

[0121] Optionally, continuing to refer to Figure 1 In the initial ink supply process, the ink supply pipe 113 can be connected to the ink bottle to supply ink. Specifically, the control unit sets the ink inlet air pipe 105 and the ink return air pipe 110 to the same negative pressure, for example, -3500 Pa, through the air pump, supplies ink to the ink return cavity 114 through the ink supply pipe 113, and determines whether to supply ink to the ink inlet cavity according to 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 the ink return cavity lower liquid level sensor 112, and the control unit can control the circulating pump to rotate to supply ink to the ink inlet cavity according to the liquid level information detected by the ink return cavity lower liquid level sensor 112 when the ink in the ink return cavity meets the ink addition requirement.

[0123] The first target sensor can be the ink return cavity lower liquid level sensor 112 in the ink return unit.

[0124] The liquid level information detected by the first target sensor in the ink returning unit is used to control the rotation of the circulating pump to supply ink to the ink inlet cavity, so that the liquid level of the ink returning cavity can be accurately monitored, the accurate control of the liquid level is ensured, the automatic control of the ink supply process is realized, the need for manual intervention is reduced, and the initial ink supply process is more intelligent and efficient through the cooperation of the first target sensor and the circulating pump.

[0125] In a possible implementation, when the liquid level information detected by the first target sensor in the ink returning unit is used to control the rotation of the circulating pump to supply ink to the ink inlet cavity, the step includes:

[0126] If the liquid level indicated by the liquid level information detected by the first target sensor in the ink returning unit reaches the preset height, the rotation of the circulating pump is controlled to supply ink to the ink inlet cavity.

[0127] For example, the control unit can determine that the height of the ink in the ink returning cavity in the ink returning cavity satisfies the preset ink adding height according to the liquid level information detected by the lower liquid level sensor 112 of the ink returning cavity, and control the rotation of the circulating pump to supply ink to the ink inlet cavity.

[0128] For example, the control unit can control the rotation of the circulating pump to supply ink to the ink inlet cavity when the liquid level information detected by the lower liquid level sensor 112 of the ink returning cavity is 1.

[0129] When the liquid level information detected by the first target sensor in the ink returning unit indicates that the liquid level reaches the preset height, the rotation of the circulating pump is controlled to supply ink to the ink inlet cavity, so that the liquid level of the ink returning cavity can be accurately monitored, the accurate control of the liquid level is ensured, the automatic control of the ink supply process is realized, the need for manual intervention is reduced, and the initial ink supply process is more intelligent and efficient through the cooperation of the first target sensor and the circulating pump.

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

[0131] According to the liquid level information detected by the first target sensor in the ink returning unit and the liquid level information detected by the second target sensor in the ink inlet unit, the rotation of the circulating pump is stopped.

[0132] Optionally, when the control unit determines that the ink in the ink return cavity meets the ink supply requirement according to the liquid level information detected by the first target sensor, i.e., the ink return cavity lower liquid level sensor 112, after controlling the circulating pump to rotate to supply ink to the ink inlet cavity, the control unit can determine whether the ink in the ink inlet cavity meets the ink supply requirement 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 inlet unit, so that when the ink in the ink inlet cavity meets the ink supply requirement, the control unit controls the circulating pump to stop rotating to complete the initial ink supply.

[0133] The second target sensor can be an ink inlet cavity lower liquid level sensor 106.

[0134] 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 can be used to control the circulating pump to stop rotating, which can accurately supply ink to the ink inlet cavity, ensure accurate control of the liquid level, and realize automatic control of the ink supply process, reducing the need for manual intervention. In addition, the use of the first target sensor, the second target sensor, and the circulating pump makes the initial ink supply process more intelligent and efficient.

[0135] In one possible implementation, when the control unit controls the circulating 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 inlet unit, the control unit can:

[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 inlet unit, the control unit controls the circulating pump to stop rotating.

[0137] For example, the control unit can determine 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 inlet 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, i.e., 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 supply to the ink inlet cavity is complete, and the control unit controls the circulating pump 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 control unit controls the circulating pump to stop rotating, which can accurately control the amount of ink and prevent ink from overflowing from the ink return cavity or the ink inlet cavity, helping to keep the circulating ink supply system clean and normal operation, avoid waste of ink and environmental pollution, and improve the stability of the circulating ink supply system.

[0139] Based on the same inventive concept, this application also provides a circulating ink supply system for performing the above-described circulating ink supply control method. The structure of the circulating ink supply system can be found in the above description. Figure 1 Repeated points will not be elaborated upon.

[0140] This application also provides an electronic device, such as... Figure 5 As shown, Figure 5 The schematic diagram of the electronic device provided in this application embodiment includes: a processor 501 and 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 and the memory 502 communicate via the bus 503. When the machine-readable instructions are executed by the processor 501, the steps of the above-described cyclic ink supply control method are performed.

[0141] This application also provides a computer-readable storage medium storing a computer program, which, when run by a processor, executes the steps of the above-described power consumption prediction method.

[0142] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, 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 displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces; the indirect coupling or communication connection of devices or modules can be electrical, mechanical, or other forms.

[0143] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. When the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that are essential or contribute to the prior art can be embodied in the form of software products, which are stored in a storage medium and include a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0144] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for controlling circulating ink supply, characterized in that, A control unit is applied to a circulating ink supply system, the circulating ink supply system including at least: the control unit, an ink inlet unit, an ink return unit, a circulating pump, and an air pump; the ink inlet unit includes multiple liquid level sensors, and the ink return unit includes multiple liquid level sensors; the method includes: Real-time acquisition of liquid level information detected by each liquid level sensor in the ink feeding unit and liquid level information detected by each liquid level sensor in the ink return unit; Based on the liquid level information detected by each sensor in the first sensor group, it is determined whether the circulating ink supply system is in a normal state. The first sensor group includes two sensors in the ink return unit or two sensors in the ink inlet unit. If so, the circulating pump or the air pump is controlled to perform ink supply circulation based on the liquid level information detected by each sensor in the second sensor group, wherein the second sensor group includes one sensor in the ink return unit and one sensor in the ink inlet unit. The first sensor group includes a first liquid level sensor and a second liquid level sensor, with the first liquid level sensor located above the second liquid level sensor. 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, then the circulating ink supply system is determined to be 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, then the circulating ink supply system is determined to be in a second abnormal state. If the liquid level indicated by the first liquid level sensor is less than the liquid level indicated by the second liquid level sensor, then the circulating ink supply system is determined to be in normal condition.

2. The circulating ink supply control method according to claim 1, characterized in that, The method further includes: If the circulating ink supply system is in a first abnormal state, a first alarm command is sent to the host computer. The first alarm command is used to indicate that the second liquid level sensor is abnormal. If the circulating ink supply system is in a second abnormal state, a second alarm command is sent to the host computer. The second alarm command is used to indicate that the target air pipe is abnormal. The target air pipe is the air pipe corresponding to the first sensor group.

3. 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, wherein 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 based on the liquid level information detected by each sensor in the second sensor group includes: If the liquid level indicated by the third liquid level sensor is less than the liquid level indicated by the fourth liquid level sensor, the circulating pump is controlled to increase its speed according to a preset speed parameter, or the air pump is controlled to decrease the pressure difference according to a preset air pressure parameter.

4. The circulating ink supply control method according to claim 3, characterized in that, The step of controlling the circulation pump or the air pump to perform ink supply circulation based on the liquid level information detected by each sensor in the second sensor group includes: If the liquid level indicated by the third liquid level sensor is greater than the liquid level indicated by the fourth liquid level sensor, control the circulating pump to reduce its 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, then control the circulating pump to maintain the current speed or control the air pump to maintain the current air pressure parameter. If neither the third liquid level sensor nor the fourth liquid level sensor detects liquid level information, the circulating pump is controlled to stop supplying ink.

5. 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 based on the liquid level information detected by each sensor in the first sensor group, the method further includes: Based on 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.

6. The circulating ink supply control method according to claim 5, characterized in that, The step of controlling the circulation pump to rotate based on the liquid level information detected by the first target sensor in the ink return unit to supply ink to the ink inlet chamber includes: 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.

7. The circulating ink supply control method according to claim 5, characterized in that, The method further includes: 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 feeding unit, the circulating pump is controlled to stop rotating.

8. The circulating ink supply control method according to claim 7, characterized in that, The step of controlling the circulation pump to stop rotating 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 feeding unit includes: 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 circulating pump is controlled to stop rotating.

9. A circulating ink supply control system, characterized in that, include: Control unit, ink inlet unit, ink return unit, circulating pump, pump ink inlet pipe, pump ink return pipe, air pump, and printhead assembly; The ink feeding unit includes multiple liquid level sensors, and the ink return unit includes multiple liquid level sensors; The control unit is used to perform the steps of the circulating ink supply control method according to any one of claims 1-8.

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