A new ink supply system and inkjet printing equipment

Abstract

The present invention relates to the field of inkjet printing technology. The present invention discloses a novel ink supply system and inkjet printing equipment, including a driving device, a first ink container, a second ink container, a first piston, a second piston and a nozzle, wherein the driving device is respectively connected to the first piston and the second piston in a transmission manner; the driving device controls the first piston and the second piston to perform reciprocating motion inside the first ink container and the second ink container, so that the ink in the second ink container flows to the first ink container through a pipeline under the action of pressure, and flows to the nozzle through the ink supply outlet of the first ink container; the novel ink supply system adopts pure pump-controlled piston control, which is different from traditional air control or air pump mixed control, effectively avoiding pressure fluctuations caused by opening and closing of the air valve and starting and stopping of the ink pump, significantly improving the stability of the ink path, and ensuring the ink supply effect.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet printing, and in particular to a novel ink supply system and inkjet printing equipment. Background Art

[0002] In the inkjet printing industry, traditional ink supply control methods mainly rely on air control technology and its combination with pump control technology; the pure air control method is a control method that generates a pressure difference at both ends of the air pipe by controlling the opening and closing of the corresponding air valve in the air circuit, thereby promoting the flow of ink in the corresponding ink circuit; however, the pure air control method has significant disadvantages. At the moment the air valve opens and closes, large pressure fluctuations will be generated. This sudden change in pressure will not only affect the stability of the ink circuit, but also directly cause drastic changes in the ink flow, thereby affecting the printing effect of the nozzle; the air pump mixed control method adds an ink pump to the pure air control method, and promotes the flow of ink in the corresponding ink circuit by starting and stopping the ink pump. Since the operation of the ink pump is relatively stable, the pressure change of the ink in the ink circuit can be reduced. However, although the operating characteristics of the ink pump are better than those of the air valve, large pressure fluctuations will still be generated at the moment of starting and stopping, thereby causing sudden changes in the pressure of the ink circuit and instability of the ink flow.

[0003] It can be seen that whether it is a pure air control method or an air pump mixed control method, there is a problem of sudden pressure changes when the air valve opens and closes and the ink pump starts and stops. This sudden change affects the stability of the ink path and ink flow, and thus affects the printing effect. Summary of the Invention

[0004] The present invention aims to improve at least one technical problem in the background technology.

[0005] A first embodiment of the present invention provides a novel ink supply system, comprising a driving device, a first ink container, a second ink container, a first piston, a second piston, and a nozzle;

[0006] A sealed space is provided inside the first ink container and the second ink container, the first piston is provided in the sealed space inside the first ink container, and the second piston is provided in the sealed space inside the second ink container;

[0007] The first ink container and the second ink container are connected by a pipeline. The first ink container is provided with an ink supply outlet, the ink supply outlet is connected to the nozzle by a pipeline, and the second ink container is provided with an ink inlet.

[0008] The driving device is respectively connected to the first piston and the second piston in a transmission manner; the driving device controls the first piston and the second piston to perform reciprocating motion inside the first ink container and the second ink container, so that the ink in the second ink container flows to the first ink container through the pipeline under the action of pressure, and then flows to the nozzle through the ink supply outlet of the first ink container.

[0009] Beneficial effects of the present invention: The new ink supply system provided by the present invention controls the flow of ink by directly driving the piston to reciprocate in the ink container through a driving device, realizing pure pump-controlled piston control. Compared with traditional air control or air pump mixed control methods, it avoids the pressure fluctuations caused by the opening and closing of the air valve and the start and stop of the ink pump, and significantly improves the stability of the ink path.

[0010] As some sub-solutions of the above technical solution, the novel ink supply system further includes a host computer, which is electrically connected to the driving device and is used to control the driving device.

[0011] As some sub-solutions of the above technical solution, the new ink supply system also includes a first sealing ring and a second sealing ring; the surface of one side of the first sealing ring is fixed to the outside of the first piston, and the surface of the other side of the first sealing ring abuts against the inner wall of the first ink container; the surface of one side of the second sealing ring is fixed to the outside of the second piston, and the surface of the other side of the second sealing ring abuts against the inner wall of the second ink container.

[0012] As some sub-solutions of the above technical solution, the new ink supply system also includes a first gas solenoid valve, a second gas solenoid valve, a first air pressure sensor and a second air pressure sensor; a first gas through hole is provided on the first piston, and a second gas through hole is provided on the second piston. The upper sealed space and the lower sealed space separated by the first piston in the first ink container are connected through the first gas through hole, and the upper sealed space and the lower sealed space separated by the second piston in the second ink container are connected through the second gas through hole; the first gas solenoid valve is installed on the first gas through hole, and the first gas solenoid valve is used to control the on and off of the first gas through hole; the second gas solenoid valve is installed on the second gas through hole, and the second gas solenoid valve is used to control the on and off of the second gas through hole; the first air pressure sensor is installed on the first piston and in contact with the sealed space in the first ink container, for real-time detection of the air pressure in the sealed space in the first ink container, and the second air pressure sensor is installed on the second piston and in contact with the sealed space in the second ink container, for real-time detection of the air pressure in the sealed space in the second ink container.

[0013] As some sub-solutions of the above technical solution, the new ink supply system also includes a first low liquid level sensor, a second low liquid level sensor, a first high liquid level sensor, a second high liquid level sensor, a first liquid solenoid valve and a second liquid solenoid valve; the first low liquid level sensor and the first high liquid level sensor are installed on the inner wall of the first ink container in sequence along the height direction, and the second low liquid level sensor and the second high liquid level sensor are installed on the inner wall of the second ink container in sequence along the height direction; the first low liquid level sensor, the first high liquid level sensor, the second low liquid level sensor and the second high liquid level sensor are used to detect the ink level in their respective ink containers in real time; a first ink discharge port is provided at the bottom of the first ink container, and a second ink discharge port is provided at the bottom of the second ink container, the first liquid solenoid valve is installed on the first ink discharge port, and the second liquid solenoid valve is installed on the second ink discharge port; by adjusting the opening of the first liquid solenoid valve and the second liquid solenoid valve, the ink in the first ink container and the second ink container is discharged from the first ink discharge port or the second ink discharge port.

[0014] As some sub-solutions of the above technical solution, the driving device includes a first servo motor, a second servo motor, a first screw rod, a second screw rod, a first universal joint and a second universal joint; a threaded hole is opened on the first piston, the output shaft of the first servo motor is fixedly connected to one end of the first screw rod, and the other end of the first screw rod is connected to the first piston through a first universal joint, and when the first servo motor is working, it drives the first screw rod to rotate, so that the first piston performs a linear reciprocating motion along the axial direction in the first ink container; a threaded hole is opened on the second piston, the output shaft of the second servo motor is fixedly connected to one end of the second screw rod, and the other end of the second screw rod is connected to the second piston through a second universal joint, and when the first servo motor is working, it drives the second screw rod to rotate, so that the second piston performs a linear reciprocating motion along the axial direction in the second ink container.

[0015] As some sub-solutions of the above technical solution, the new ink supply system also includes a first check valve, a second check valve and a third check valve; a first ink through hole is provided on the first piston, and the first check valve is installed on the first ink through hole; a second ink through hole is provided on the second piston, and the second check valve is installed on the second ink through hole; the third check valve is installed on the ink supply outlet.

[0016] As some sub-solutions of the above technical solution, the inner cavities of the first ink container and the second ink container are both cylindrical cavities, and the outer walls of the first ink container and the second ink container are marked with scales along the height direction.

[0017] As some sub-solutions of the above technical solution, the new ink supply system also includes an ink pump, a third solenoid valve, an ink return pipe and a fourth check valve, the nozzle includes a recirculating nozzle and a non-circulating nozzle, the second ink container is also provided with an ink return port, and the ink return port is installed with the fourth check valve; when the new ink supply system is used for circulating ink supply, the ink supply outlet of the first ink container is connected to the ink inlet pipe of the recirculating nozzle, the ink outlet of the recirculating nozzle is connected to the ink return pipe through the ink return pipe, and the ink return pipe is provided with the ink pump and the third solenoid valve in parallel; when the new ink supply system is used for non-circulating ink supply, the ink supply outlet of the first ink container is connected to the ink inlet pipe of the non-circulating nozzle.

[0018] A second embodiment of the present invention provides an inkjet printing device, comprising any one of the novel ink supply systems described above.

[0019] The inkjet printing device according to the second embodiment of the present invention also has corresponding beneficial effects because it includes the novel ink supply system of the above technical solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 A schematic structural diagram of a novel ink supply system provided by an embodiment of the present invention during circulating ink supply;

[0022] Figure 2 A schematic structural diagram of the novel ink supply system provided in an embodiment of the present invention when ink is not circulated.

[0023] In the attached figure:

[0024] 100 - First ink container; 101 - First piston; 102 - First servo motor; 103 - First screw; 104 - First universal joint; 105 - First sealing ring; 106 - First gas solenoid valve; 107 - First air pressure sensor; 108 - First gas through hole; 109 - First low liquid level sensor; 110 - First high liquid level sensor; 111 - First liquid solenoid valve; 112 - First ink outlet; 113 - First check valve; 114 - First ink through hole; 115 - Third check valve; 116 - Ink supply outlet;

[0025] 200 - Second ink container; 201 - Second piston; 202 - Second servo motor; 203 - Second screw; 204 - Second universal joint; 205 - Second sealing ring; 206 - Second gas solenoid valve; 207 - Second air pressure sensor; 208 - Second gas through hole; 209 - Second low liquid level sensor; 210 - Second high liquid level sensor; 211 - Second liquid solenoid valve; 212 - Second ink discharge port; 213 - Second check valve; 214 - Second ink through hole; 215 - Fourth check valve; 216 - Ink return port; 217 - Ink inlet;

[0026] 300-ink pump; 301-third solenoid valve; 302-ink return pipe;

[0027] 400-circulating nozzle; 401-non-circulating nozzle. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, "several" means an indefinite quantity, "multiple" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, and "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" is solely for the purpose of distinguishing technical features and should not be understood to indicate or imply relative importance, or to implicitly indicate the number or order of the technical features indicated. "And / or" throughout the text represents three parallel solutions. For example, "A and / or B" means a solution where A satisfies, a solution where B satisfies, or a solution where both A and B satisfy.

[0031] In the description of the present invention, if there is a short sentence containing multiple parallel features, the attributive defines the closest feature. For example, "B, C, and E are arranged on A, and are connected to D" means that B is arranged on A and E is connected to D, and does not constitute a limitation on C. However, attributives that express the relationship between features, such as "spaced arrangement" or "circular arrangement", do not fall into this category. If the word "all" is preceded by an attributive, it means that all features in the short sentence are limited. For example, "B, C, and D are all arranged on A" means that B, C, and D are all arranged on A. In a sentence with an omitted subject, the omitted subject is the subject of the previous sentence, that is, "B is arranged on A, including C" means that B is arranged on A and A includes C.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] The following combination Figures 1 to 2 Embodiments of the present invention are described.

[0034] A novel ink supply system in this embodiment includes a driving device, a first ink container 100, a second ink container 200, a first piston 101, a second piston 201 and a nozzle;

[0035] A sealed space is provided inside the first ink container 100 and the second ink container 200. The first piston 101 is provided in the sealed space inside the first ink container 100, and the second piston 201 is provided in the sealed space inside the second ink container 200.

[0036] The first ink container 100 is connected to the second ink container 200 by a pipe. The first ink container 100 is provided with an ink supply outlet 116, which is connected to the nozzle by a pipe. The second ink container 200 is provided with an ink inlet 217.

[0037] The driving device is respectively connected to the first piston 101 and the second piston 201; the driving device controls the first piston 101 and the second piston 201 to reciprocate inside the first ink container 100 and the second ink container 200, so that the ink in the second ink container 200 flows to the first ink container 100 through the pipeline under the action of pressure, and flows to the nozzle through the ink supply outlet 116 of the first ink container 100.

[0038] In this embodiment, the first ink container 100 is an ink supply container, used to directly supply ink to the nozzle. The second ink container 200 is an ink filling container, used to receive ink added to the new ink supply system from the outside. The second ink container 200 also serves as an ink return container, used to receive ink returned from the nozzle in the circulating ink supply mode. The second ink container 200 is connected to the first ink container 100 by a pipe, so that the ink in the second ink container 200 can be transferred to the first ink container 100, forming a circulating ink supply. The first ink container 100 has a larger bottom area, which effectively reduces the liquid level changes caused by changes in the same volume of ink, further reducing the rate of change of ink pressure, and ensuring the stability of the ink supply pressure. A first piston 101 and a second piston 201 are respectively provided inside the first ink container 100 and the second ink container 200. The pistons are driven to reciprocate in the ink containers by a driving device, so that a pressure difference is generated inside the first ink container 100 and the second ink container 200, thereby controlling the flow of ink. Compared with traditional air control or air pump mixed control methods, pressure fluctuations caused by the opening and closing of the air valve and the start and stop of the ink pump 300 are avoided, thereby significantly improving the stability of the ink path. At the same time, since peripheral air supply devices such as air tanks, air pumps, air pipes and a large number of auxiliary gas solenoid valves and connectors are eliminated, the system space is greatly saved.

[0039] Specifically, the new ink supply system also includes a host computer, which is electrically connected to the drive device and is used to control the drive device. In this embodiment, the entire system's ink supply is implemented through host computer programming. The air pressure sensor, hydraulic pressure sensor, and drive device feed signals back to the host computer, which then uses program conversion calculations to determine whether the corresponding servo motor, solenoid valve, and ink pump 300 should be opened or closed, achieving closed-loop control of the ink circuit pressure.

[0040] Specifically, the new ink supply system further includes a first sealing ring 105 and a second sealing ring 205. One surface of the first sealing ring 105 is fixed to the outside of the first piston 101, while the other surface of the first sealing ring 105 abuts the inner wall of the first ink container 100. One surface of the second sealing ring 205 is fixed to the outside of the second piston 201, while the other surface of the second sealing ring 205 abuts the inner wall of the second ink container 200. In this embodiment, during operation of the new ink supply system, the sealing rings always abut against the inner wall of the ink container. When the piston moves within the ink container, the sealing rings follow the piston's movement and always adhere to the inner wall of the ink container, thereby sealing the gap between the piston and the ink container. This effectively prevents ink and air from leaking downward from the gap between the piston and the inner wall of the ink bottle, ensuring the sealing of the upper and lower spaces within the ink container separated by the piston and preventing any impact on the ink supply pressure.

[0041] Specifically, the new ink supply system further includes a first gas solenoid valve 106, a second gas solenoid valve 206, a first air pressure sensor 107 and a second air pressure sensor 207; a first gas through hole 108 is provided on the first piston 101, and a second gas through hole 208 is provided on the second piston 201; the upper sealed space and the lower sealed space separated by the first piston 101 in the first ink container 100 are communicated through the first gas through hole 108, and the upper sealed space and the lower sealed space separated by the second piston 201 in the second ink container 200 are communicated through the second gas through hole 208; the first gas solenoid valve 106 is installed in the first On a gas through hole 108, a first gas solenoid valve 106 is used to control the on-off of the first gas through hole 108; a second gas solenoid valve 206 is installed on the second gas through hole 208, and the second gas solenoid valve 206 is used to control the on-off of the second gas through hole 208; a first air pressure sensor 107 is installed on the first piston 101 and contacts the sealed space in the first ink container 100, and is used to detect the air pressure in the sealed space in the first ink container 100 in real time; a second air pressure sensor 207 is installed on the second piston 201 and contacts the sealed space in the second ink container 200, and is used to detect the air pressure in the sealed space in the second ink container 200 in real time.

[0042] In this embodiment, when the air pressure in the first ink container 100 needs to be adjusted, the host computer sends a control signal to the first gas solenoid valve 106 based on the data feedback from the first air pressure sensor 107 and the preset control strategy, and controls the first gas solenoid valve 106 to be open for a certain period of time, so that the gas in the upper sealed space is discharged into the lower sealed space through the first gas through hole 108; similarly, the air pressure adjustment in the second ink container 200 is also performed in a similar manner under the control of the host computer; during the operation of the new ink supply system, the stability of the entire new ink supply system is maintained through the precise control of the air pressure by the first gas solenoid valve 106 and the second gas solenoid valve 206.

[0043] Specifically, the new ink supply system further includes a first low liquid level sensor 109, a second low liquid level sensor 209, a first high liquid level sensor 110, a second high liquid level sensor 210, a first liquid solenoid valve 111, and a second liquid solenoid valve 211; the first low liquid level sensor 109 and the first high liquid level sensor 110 are sequentially mounted on the inner wall of the first ink container 100 along the height direction thereof, and the second low liquid level sensor 209 and the second high liquid level sensor 210 are sequentially mounted on the inner wall of the second ink container 200 along the height direction thereof; the first low liquid level sensor 109, the first high liquid level sensor 110, the second low liquid level sensor 111, the second high liquid level sensor 211 The level sensor 209 and the second high liquid level sensor 210 are used to detect the ink levels in their respective ink containers in real time; the first ink container 100 is provided with a first ink discharge port 112 at the bottom, and the second ink container 200 is provided with a second ink discharge port 212 at the bottom, the first liquid solenoid valve 111 is installed on the first ink discharge port 112, and the second liquid solenoid valve 211 is installed on the second ink discharge port 212; by adjusting the opening of the first liquid solenoid valve 111 and the second liquid solenoid valve 211, the ink in the first ink container 100 and the second ink container 200 is discharged from the first ink discharge port 112 or the second ink discharge port 212.

[0044] In this embodiment, after receiving the signal from the liquid level sensor, the host computer controls the first liquid solenoid valve 111 and the second liquid solenoid valve 211 according to a preset control program. When the ink level in the first ink container 100 drops below the threshold value set by the first low liquid level sensor 109, the first low liquid level sensor 109 feeds back an ink shortage signal to the control system. At this time, the driving device and the piston can be adjusted to control the ink in the second ink container 200 to flow to the first ink container 100 to complete the ink filling. Similarly, when the ink level in the second ink container 200 drops below the threshold value set by the second low liquid level sensor 109, the ink in the second ink container 200 is controlled to flow to the first ink container 100 to complete the ink filling. When the threshold set by the sensor 209 is reached, the second low liquid level sensor 209 feeds back an ink shortage signal to the control system. At this time, the outside world can add ink to the second ink container 200; the first high liquid level sensor 110 and the second high liquid level sensor 210 are used to detect whether there is too much ink in the first ink container 100 and the second ink container 200; when cleaning the ink path or replacing the ink, the control system controls the first liquid solenoid valve 111 and the second liquid solenoid valve 211 to open according to the operating instructions, so that the ink is discharged from the ink discharge ports in the first ink container 100 and the second ink container 200.

[0045] Specifically, the driving device includes a first servo motor 102, a second servo motor 202, a first screw rod 103, a second screw rod 203, a first universal joint 104 and a second universal joint 204; a threaded hole is opened on the first piston 101, the output shaft of the first servo motor 102 is fixedly connected to one end of the first screw rod 103, and the other end of the first screw rod 103 is connected to the first piston 101 through the first universal joint 104. When the first servo motor 102 is working, it drives the first screw rod 103 to rotate, so that the first piston 101 performs a linear reciprocating motion along the axial direction in the first ink container 100; a threaded hole is opened on the second piston 201, the output shaft of the second servo motor 202 is fixedly connected to one end of the second screw rod 203, and the other end of the second screw rod 203 is connected to the second piston 201 through the second universal joint 204. When the first servo motor 102 is working, it drives the second screw rod 203 to rotate, so that the second piston 201 performs a linear reciprocating motion along the axial direction in the second ink container 200.

[0046] When the new ink supply system is activated and receives an ink supply command, the control system sends control signals to the first servo motor 102 and the second servo motor 202 based on preset ink supply parameters and printhead requirements. These signals include motor speed, direction, and run time. The first servo motor 102 begins to operate, and its output shaft rotates the first screw rod 103 connected to it. Because the first screw rod 103 is threadedly connected to the first piston 101, according to the principle of threaded transmission, the rotational motion of the first screw rod 103 is converted into linear reciprocating motion of the first piston 101 along the axial direction within the first ink container 100. The movement of the first servo motor 102 and the second screw rod 203 is similar to that of the first servo motor 102 and the first screw rod 103. The first universal joint 104 and the second universal joint 204 are used to reduce the axis deviation during the movement of the screw; specifically, when the screw rotates under the drive of the servo motor, the axis of the screw and the axis of the piston may deviate due to factors such as manufacturing errors, installation accuracy or changes in the internal pressure of the ink container. At this time, the ball joint structure inside the universal joint will come into play. The ball joint consists of a sphere and a ball socket that matches it. The sphere is connected to the screw, and the ball socket is connected to the piston. When axis deviation occurs, the ball can rotate and swing freely in the ball socket, thereby achieving adaptive adjustment of the axis deviation.

[0047] Specifically, the novel ink supply system also includes a first check valve 113, a second check valve 213, and a third check valve 115. The first piston 101 is provided with a first ink through-hole 114, to which the first check valve 113 is mounted. The second piston 201 is provided with a second ink through-hole 214, to which the second check valve 213 is mounted. The third check valve 115 is mounted on the ink supply outlet 116. The first check valve 113, the second check valve 213, and the third check valve 115 stabilize the pressure in the ink circuit. Because they prevent backflow and abnormal flow of ink, specifically, when the ink pump 300 stops operating or its speed changes, the check valves prevent backflow of ink in the ink circuit, ensuring that the ink flows in the intended direction. This prevents ink from backflowing into the trachea due to negative tracheal pressure, allowing the pressure in the ink bottle to remain relatively stable, thereby ensuring stable ink pressure at the nozzle.

[0048] Specifically, the inner cavities of the first and second ink containers 100 and 200 are both cylindrical, and the outer walls of the first and second ink containers 100 and 200 are marked with graduations along the height direction. The inner cavities of the first and second ink containers 100 and 200 are strictly designed to be standard cylindrical shapes, ensuring the regularity of the internal spaces of the ink bottles and promoting more uniform distribution of ink within the containers. Furthermore, the graduations on the outer walls of the first and second ink containers 100 and 200, combined with the piston travel speed and ink bottle size, can be used to calculate both the instantaneous and cumulative flow rates of the ink, reducing the cost of using flow sensors to measure flow.

[0049] Specifically, the new ink supply system also includes an ink pump 300, a third solenoid valve 301, an ink return pipe 302 and a fourth check valve 215. The nozzle includes a circulating nozzle 400 and a non-circulating nozzle 401. The second ink container 200 is also provided with an ink return port 216, and the ink return port 216 is installed with a fourth check valve 215; when the new ink supply system is used for circulating ink supply, the ink supply outlet 116 of the first ink container 100 is connected to the ink inlet pipe of the circulating nozzle 400, and the ink outlet of the circulating nozzle 400 is connected to the ink return port 216 pipe through the ink return pipe 302, and the ink return pipe 302 is provided with an ink pump 300 and a third solenoid valve 301 connected in parallel; when the new ink supply system is used for non-circulating ink supply, the ink supply outlet 116 of the first ink container 100 is connected to the ink inlet pipe of the non-circulating nozzle 401.

[0050] Specifically, when the new ink supply system is used for circulating ink supply, the ink pump 300 is first started, and the ink pump 300 runs at a relatively high speed, quickly pumping ink from the recyclable nozzle 400 back to the second ink container 200, and causing the ink to start flowing in the entire circulation loop. At this time, the third solenoid valve 301 is in a closed state, and the high-speed operation of the ink pump 300 can quickly remove the air in the nozzle and the ink path, so that the ink quickly fills the entire circulation loop, shortening the system startup time; at the same time, the first piston 101 in the first ink container 100 and the second piston 201 in the second ink container 200 move in coordination according to the command of the control system, and the first piston 101 moves upward to lower the first ink container 100. When the pressure in the second ink container 100 is increased, the second piston 201 moves downward, increasing the pressure in the second ink container 200, promoting the ink to flow from the second ink container 200 to the first ink container 100, and then to the recyclable nozzle 400, forming a complete circulation path; when the circulation is stable, the ink pump 300 stops running and opens the third solenoid valve 301, so that the ink forms a stable circulation loop through the third solenoid valve 301; the ink pump 300 can be used as a backup power source. When the ink spraying amount of the nozzle suddenly increases or the ink path pressure fluctuates and needs to be quickly adjusted, the control system can start the ink pump 300 again to assist in adjusting the ink flow and pressure; the fourth check valve 215 is used to prevent ink from flowing back from the ink return port 216.

[0051] Specifically, when the new ink supply system is used for non-circulating ink supply, the non-circulating nozzle 401 is not connected to the third solenoid valve 301, that is, the ink pump 300; the control system controls the first servo motor 102 to drive the first piston 101 to move according to demand, increases the pressure in the first ink container 100, and makes the ink supply pipeline flow to the non-circulating nozzle 401.

[0052] It should be noted that during non-circulating inkjet operation, when the amount of ink ejected is low or when inkjet is paused, the volume occupied by the ink and the air pressure within the first ink container 100 remain nearly constant, and accordingly, the internal pressure remains substantially stable. In this situation, simply by keeping the first servo motor 102 stationary and the first piston 101 stationary, the pressure within the first ink container 100 can be effectively maintained constant, thereby smoothly achieving ink supply. However, during circulating inkjet operation, to ensure continuous circulation of ink through the printhead, the first servo motor 102 and the second servo motor 202 must be precisely controlled and coordinated to ensure their coordinated operation. By precisely regulating the operating parameters of the first and second servo motors 102, 202, and changing the pressure environment within the first and second ink containers 100, 200, the ink is driven to flow stably in a predetermined direction, thereby successfully completing the circulating ink supply process. This ensures that the printhead receives a stable and continuous ink supply throughout the circulating inkjet process, effectively improving the quality and efficiency of the inkjet operation.

[0053] A second embodiment of the present invention provides an inkjet printing device, comprising any one of the novel ink supply systems described above.

[0054] The inkjet printing device according to the second embodiment of the present invention also has corresponding beneficial effects because it includes the novel ink supply system of the above technical solution.

[0055] The above specifically describes the preferred embodiments of the present invention, but the present disclosure is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present disclosure.

Claims

1. A new ink supply system, characterized by: It comprises a driving device, a first ink container (100), a second ink container (200), a first piston (101), a second piston (201) and a nozzle; A sealed space is provided inside the first ink container (100) and the second ink container (200); the first piston (101) is provided in the sealed space inside the first ink container (100); and the second piston (201) is provided in the sealed space inside the second ink container (200); The first ink container (100) and the second ink container (200) are connected by a pipeline, the first ink container (100) is provided with an ink supply outlet (116), the ink supply outlet (116) is connected to the nozzle by a pipeline, and the second ink container (200) is provided with an ink inlet (217); The driving device is respectively connected to the first piston (101) and the second piston (201); the driving device controls the first piston (101) and the second piston (201) to perform reciprocating motion inside the first ink container (100) and the second ink container (200), so that the ink in the second ink container (200) flows into the first ink container (100) through the pipeline under the action of pressure, and then flows into the nozzle through the ink supply outlet (116) of the first ink container (100); The novel ink supply system further comprises a first gas solenoid valve (106), a second gas solenoid valve (206), a first air pressure sensor (107) and a second air pressure sensor (207); a first gas through hole (108) is provided on the first piston (101), a second gas through hole (208) is provided on the second piston (201), an upper sealed space and a lower sealed space separated by the first piston (101) in the first ink container (100) are connected through the first gas through hole (108), and an upper sealed space and a lower sealed space separated by the second piston (201) in the second ink container (200) are connected through the second gas through hole (208); the first gas solenoid valve (106) is installed in the The first gas solenoid valve (106) is mounted on the first gas through hole (108) and is used to control the on / off state of the first gas through hole (108); the second gas solenoid valve (206) is mounted on the second gas through hole (208) and is used to control the on / off state of the second gas through hole (208); the first air pressure sensor (107) is mounted on the first piston (101) and is in contact with the sealed space in the first ink container (100) and is used to detect the air pressure in the sealed space in the first ink container (100) in real time; the second air pressure sensor (207) is mounted on the second piston (201) and is in contact with the sealed space in the second ink container (200) and is used to detect the air pressure in the sealed space in the second ink container (200) in real time.

2. The novel ink supply system according to claim 1, characterized in that: The novel ink supply system further includes a host computer, which is electrically connected to the driving device and is used to control the driving device.

3. The novel ink supply system according to claim 1, characterized in that: The novel ink supply system further includes a first sealing ring (105) and a second sealing ring (205); a surface on one side of the first sealing ring (105) is fixed on the outside of the first piston (101), and a surface on the other side of the first sealing ring (105) abuts against the inner wall of the first ink container (100); a surface on one side of the second sealing ring (205) is fixed on the outside of the second piston (201), and a surface on the other side of the second sealing ring (205) abuts against the inner wall of the second ink container (200).

4. The novel ink supply system according to claim 1, characterized in that: The novel ink supply system further comprises a first low liquid level sensor (109), a second low liquid level sensor (209), a first high liquid level sensor (110), a second high liquid level sensor (210), a first liquid solenoid valve (111) and a second liquid solenoid valve (211); the first low liquid level sensor (109) and the first high liquid level sensor (110) are sequentially mounted on the inner wall of the first ink container (100) along the height direction thereof, and the second low liquid level sensor (209) and the second high liquid level sensor (210) are sequentially mounted on the inner wall of the second ink container (200) along the height direction thereof; the first low liquid level sensor (109), the first high liquid level sensor (110), the second low liquid level sensor (20 9) and the second high liquid level sensor (210) are used to detect the ink liquid level in the respective ink containers in real time; the first ink container (100) is provided with a first ink discharge port (112) at the bottom, and the second ink container (200) is provided with a second ink discharge port (212) at the bottom, the first liquid solenoid valve (111) is installed on the first ink discharge port (112), and the second liquid solenoid valve (211) is installed on the second ink discharge port (212); by adjusting the opening of the first liquid solenoid valve (111) and the second liquid solenoid valve (211), the ink in the first ink container (100) and the second ink container (200) is discharged from the first ink discharge port (112) or the second ink discharge port (212).

5. The novel ink supply system according to claim 1, characterized in that: The driving device comprises a first servo motor (102), a second servo motor (202), a first screw rod (103), a second screw rod (203), a first universal joint (104) and a second universal joint (204); a threaded hole is provided on the first piston (101); the output shaft of the first servo motor (102) is fixedly connected to one end of the first screw rod (103); the other end of the first screw rod (103) is connected to the first piston (101) via the first universal joint (104); when the first servo motor (102) is in operation, the first screw rod (103) is driven to rotate. , so that the first piston (101) performs linear reciprocating motion along the axial direction in the first ink container (100); a threaded hole is opened on the second piston (201), the output shaft of the second servo motor (202) is fixedly connected to one end of the second screw rod (203), and the other end of the second screw rod (203) is connected to the second piston (201) through a second universal joint (204); when the first servo motor (102) is in operation, it drives the second screw rod (203) to rotate, so that the second piston (201) performs linear reciprocating motion along the axial direction in the second ink container (200).

6. The novel ink supply system according to claim 1, characterized in that: The novel ink supply system further comprises a first check valve (113), a second check valve (213) and a third check valve (115); a first ink through hole (114) is provided on the first piston (101), and the first check valve (113) is mounted on the first ink through hole (114); a second ink through hole (214) is provided on the second piston (201), and the second check valve (213) is mounted on the second ink through hole (214); and the third check valve (115) is mounted on the ink supply outlet (116).

7. The novel ink supply system according to claim 1, characterized in that: The inner cavities of the first ink container (100) and the second ink container (200) are both cylindrical cavities, and the outer walls of the first ink container (100) and the second ink container (200) are marked with scales along the height direction.

8. The novel ink supply system according to claim 1, characterized in that: The novel ink supply system further comprises an ink pump (300), a third solenoid valve (301), an ink return pipe (302), and a fourth check valve (215); the nozzle comprises a circulating nozzle (400) and a non-circulating nozzle (401); the second ink container (200) is further provided with an ink return port (216), and the fourth check valve (215) is installed on the ink return port (216); When the novel ink supply system is used for circulating ink supply, the ink supply outlet (116) of the first ink container (100) is connected to the ink inlet pipe of the recyclable nozzle (400), and the ink outlet of the recyclable nozzle (400) is connected to the ink return port (216) pipe via the ink return pipe (302), and the ink return pipe (302) is provided with the ink pump (300) and the third solenoid valve (301) in parallel; When the novel ink supply system is used for non-circulating ink supply, the ink supply outlet (116) of the first ink container (100) is connected to the ink inlet pipe of the non-circulating nozzle (401).

9. An inkjet printing device, characterized in that: The novel ink supply system comprises the novel ink supply system according to any one of claims 1 to 8.

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