Circulating ink supply device and ink-jet printing equipment

Abstract

The invention relates to the technical field of ink-jet printing, in particular to a circulating ink supply device and ink-jet printing equipment, and the circulating ink supply device comprises a shell, and an ink supply bottle, an ink inlet connecting assembly, an ink return connecting assembly, an ink return bottle, an ink stabilizing connecting assembly, a diaphragm pump, an ink stabilizing bottle, a filter assembly and a plurality of sealing shaft assemblies which are all arranged in the shell, the parts are connected through the sealing shaft assembly. Through the simplified structural design and the optimized ink circulation path, the problems that a traditional ink supply system is complex in structure, difficult to maintain, unstable in ink pressure and long in circulation path are solved, and the ink supply system has the advantages of being simplified in structure, convenient to maintain, stable in ink pressure and short in circulation path.

Description

Technical Field

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

[0002] Traditional ink supply system designs are usually complex, with many layers and intricate pipes inside. This design not only significantly increases the overall complexity of the system, but also makes daily maintenance and fault diagnosis extremely difficult. Each additional layer and each extension of the pipe brings more potential failure points and higher maintenance costs. This complex structural design not only increases production costs, but also reduces the reliability and stability of the system.

[0003] In the ink circulation system, the ink pump is a key component to promote the circulation of ink. However, the ink pump is directly connected in series in the ink path, which means that the flow and pressure control of the ink depends entirely on the performance and stability of the ink pump. Since the ink pump directly affects the ink, any change in its working state will directly affect the flow state and pressure distribution of the ink. This direct connection makes it extremely difficult to control the ink pressure stably. Instability in ink pressure may lead to fluctuations in print quality, and may even cause serious problems such as nozzle damage or ink leakage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The solution of the present invention to solve the technical problem is: a circulating ink supply device, which includes a shell and an ink supply bottle, an ink inlet connecting assembly, an ink return connecting assembly, an ink return bottle, an ink stabilizing connecting assembly, a diaphragm pump, an ink stabilizing bottle, a filter assembly and a plurality of sealing shaft assemblies, all of which are arranged inside the shell. The ink outlet end of the ink supply bottle is connected to the ink inlet end of the filter assembly, the ink outlet end of the filter assembly is connected to the ink inlet end of the ink inlet connecting assembly through a sealing shaft assembly, the ink outlet end of the ink inlet connecting assembly is used to be connected to the ink inlet end of the nozzle, and the return The ink inlet end of the ink connecting assembly is used to be connected to the ink outlet end of the nozzle, the ink inlet end of the ink return bottle is connected to the ink outlet end of the ink return connecting assembly through a sealing shaft assembly, the ink outlet end of the ink return bottle is connected to the ink inlet end of the ink stabilizing connecting assembly through a sealing shaft assembly, the ink outlet end of the ink stabilizing connecting assembly is connected to the ink inlet end of the diaphragm pump through the sealing shaft assembly, the ink inlet end of the ink stabilizing bottle is connected to the ink outlet end of the diaphragm pump through the sealing shaft assembly, and the ink inlet end of the ink supply bottle is connected to the ink outlet end of the ink stabilizing bottle through the sealing shaft assembly.

[0006] As a further improvement of the above technical solution, the circulating ink supply device also includes an air pipe joint, which connects the internal space of the outer shell with the external space, and the air inlet end of the air pipe joint is used to connect to an external air pump, and the air inlet ends of the ink supply bottle, the ink return bottle and the ink stabilization bottle are respectively connected to the air outlet end of the air pipe joint.

[0007] As a further improvement of the above technical solution, the sealing shaft assembly includes a sealing shaft body and two sealing rings. The sealing shaft body is provided with a through hole that penetrates the sealing shaft body. The through hole is used for ink to pass through. The inner wall of the sealing ring is against the outer wall of the sealing shaft body.

[0008] As a further improvement of the above technical solution, the ink inlet connecting assembly includes an ink inlet valve seat bottom plate, multiple ink inlet pipe joints and multiple ink inlet high-frequency solenoid valves. An ink inlet path is provided inside the ink inlet valve seat bottom plate. The ink inlet path is connected with the ink outlet end of the ink supply bottle through the sealing shaft assembly. One end of the ink inlet pipe joint is connected to the ink inlet path, and the other end of the ink inlet pipe joint is used to be connected to the ink inlet end of the nozzle. The ink inlet high-frequency solenoid valves are arranged in a one-to-one correspondence with the ink inlet pipe joints, and the ink inlet high-frequency solenoid valves are used to control the opening and closing of the ink inlet pipe joints.

[0009] As a further improvement of the above technical solution, the ink return connection assembly includes an ink return valve seat bottom plate, multiple ink return pipe joints and multiple ink return high-frequency solenoid valves. An ink return ink path is provided inside the ink return valve seat bottom plate. The ink return ink path is connected with the ink inlet end of the ink return bottle through the sealing shaft assembly. One end of the ink return pipe joint is connected to the ink return ink path, and the other end of the ink return pipe joint is used to be connected to the ink outlet end of the nozzle. The ink return high-frequency solenoid valve and the ink return pipe joint are arranged in a one-to-one correspondence, and the ink return high-frequency solenoid valve is used to control the opening and closing of the ink return pipe joint.

[0010] As a further improvement of the above technical solution, the ink stabilizing connection assembly includes a circulating liquid replenishment base and a circulating liquid replenishment high-frequency solenoid valve, a circulating ink circuit is provided inside the circulating liquid replenishment base, the ink inlet end of the circulating ink circuit is connected to the ink outlet end of the ink return bottle through the sealing shaft assembly, the ink outlet end of the circulating ink circuit is connected to the ink inlet end of the diaphragm pump through the sealing shaft assembly, the circulating liquid replenishment high-frequency solenoid valve is arranged on the circulating liquid replenishment base, and the circulating liquid replenishment high-frequency solenoid valve is used to control the opening and closing of the circulating ink circuit.

[0011] As a further improvement of the above technical solution, the circulating ink supply device also includes multiple liquid level sensors and multiple sensor amplifiers. The liquid level sensors are arranged on the outside of the ink supply bottle, the ink return bottle and the ink stabilizing bottle. The liquid level sensors are used to detect the liquid levels in the ink supply bottle, the ink return bottle and the ink stabilizing bottle. The sensor amplifier is used to adjust the sensitivity of the liquid level sensor so that the sensor reaches the best working state.

[0012] As a further improvement of the above technical solution, the diaphragm pump includes a diaphragm body, a diaphragm cavity and a driving component, the diaphragm body is arranged in the diaphragm cavity, the driving component drives the diaphragm body to be pulled up and compressed in the diaphragm cavity, thereby changing the air pressure in the diaphragm cavity, and the diaphragm cavity is provided with an ink inlet and an ink outlet, the ink inlet is connected to the ink outlet end of the ink return bottle through the sealing shaft assembly, and the ink outlet is connected to the ink return end of the ink supply bottle through the sealing shaft assembly.

[0013] An inkjet printing device comprises the circulating ink supply device as described in any one of the above items.

[0014] The beneficial effects of the present invention are as follows: a circulating ink supply device provided by the present invention comprises a shell and an ink supply bottle, an ink inlet connecting assembly, an ink return connecting assembly, an ink return bottle, an ink stabilizing connecting assembly, a diaphragm pump, an ink stabilizing bottle, a filter assembly and a plurality of sealing shaft assemblies all arranged inside the shell. Through simplified structural design and optimized ink circulation path, the problems of complex structure, difficult maintenance, unstable ink pressure and long circulation path of the traditional ink supply system are solved. The device has the advantages of simplified structure, convenient maintenance, stable ink pressure and short circulation path. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view of the present invention;

[0016] Figure 2 is a top view of the present invention;

[0017] Figure 3 is a rear view of the present invention;

[0018] Figure 4 is a bottom view of the present invention;

[0019] Figure 5 It is an exploded view of a diaphragm pump;

[0020] Figure 6 is a cross-sectional view of the seal shaft assembly.

[0021] In the accompanying drawings: 1-housing, 2-ink supply bottle, 3-ink return bottle, 4-diaphragm pump, 401-diaphragm body, 402-diaphragm cavity, 403-driving member, 404-ink inlet, 405-ink outlet, 5-ink stabilizing bottle, 6-sealing shaft assembly, 601-sealing shaft body, 602-sealing ring, 7-air pipe joint, 801-ink inlet valve seat bottom plate, 802-ink inlet pipe joint, 803-ink inlet high-frequency solenoid valve, 901-ink return valve seat bottom plate, 902-ink return pipe joint, 903-ink return high-frequency solenoid valve, 1001-circulating liquid replenishment base, 1002-circulating liquid replenishment high-frequency solenoid valve, 11-liquid level sensor, 12-sensor amplifier, 13-filter assembly, 14-external ink adding pipe joint, 15-ink adding high-frequency solenoid valve, 16-electrical connector. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the above briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0023] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present invention can be combined interchangeably without conflicting with each other.

[0024] Traditional ink supply system designs are usually complex, with many layers and intricate pipes inside. This design not only significantly increases the overall complexity of the system, but also makes daily maintenance and fault diagnosis extremely difficult. Each additional layer and each extension of the pipe brings more potential failure points and higher maintenance costs. This complex structural design not only increases production costs, but also reduces the reliability and stability of the system.

[0025] In the ink circulation system, the ink pump is a key component to promote the circulation of ink. However, the ink pump is directly connected in series in the ink path, which means that the flow and pressure control of the ink depends entirely on the performance and stability of the ink pump. Since the ink pump directly affects the ink, any change in its working state will directly affect the flow state and pressure distribution of the ink. This direct connection makes it extremely difficult to control the ink pressure stably. Instability in ink pressure may lead to fluctuations in print quality, and may even cause serious problems such as nozzle damage or ink leakage.

[0026] To this end, the present invention proposes a circulating ink supply device, referring to Figure 1 to Figure 6 The invention comprises a housing 1 and an ink supply bottle 2, an ink inlet connection assembly, an ink return connection assembly, an ink return bottle 3, an ink stabilizing connection assembly, a diaphragm pump 4, an ink stabilizing bottle 5, a filter assembly 13 and a plurality of sealing shaft assemblies 6, all of which are arranged inside the housing 1. The ink outlet end of the ink supply bottle 2 is connected to the ink inlet end of the filter assembly 13, the ink outlet end of the filter assembly 13 is connected to the ink inlet end of the ink inlet connection assembly through the sealing shaft assembly 6, the ink outlet end of the ink inlet connection assembly is used to be connected to the ink inlet end of the nozzle, and the ink inlet end of the ink return connection assembly is used to be connected to the nozzle. It is connected to the ink outlet end of the nozzle, the ink inlet end of the ink return bottle 3 is connected to the ink outlet end of the ink return connecting assembly through the sealing shaft assembly 6, the ink outlet end of the ink return bottle 3 is connected to the ink inlet end of the ink stabilizing connecting assembly through the sealing shaft assembly 6, the ink outlet end of the ink stabilizing connecting assembly is connected to the ink inlet end of the diaphragm pump 4 through the sealing shaft assembly 6, the ink inlet end of the ink stabilizing bottle 5 is connected to the ink outlet end of the diaphragm pump 4 through the sealing shaft assembly 6, and the ink inlet end of the ink supply bottle 2 is connected to the ink outlet end of the ink stabilizing bottle 5 through the sealing shaft assembly 6.

[0027] Specifically, the ink enters the filter assembly 13 from the ink supply bottle 2. After the filter assembly 13 filters the ink, the ink flows into the ink inlet connection assembly. The ink inlet connection assembly diverts the ink to each nozzle for printing. The ink flowing out of the nozzle enters the ink return connection assembly and converges into the ink return bottle 3. When the ink supply bottle 2 needs to be refilled with ink, the ink flows out from the ink return bottle 3 and enters the diaphragm pump 4 through the ink stabilizing connection assembly. The diaphragm pump 4 is started to make the ink flow into the ink stabilizing bottle 5. Due to the pressure difference between the ink stabilizing bottle 5 and the ink supply bottle 2, the ink in the ink stabilizing bottle 5 flows into the ink supply bottle 2 to complete the circulation. A sealing shaft assembly 6 is used between the various components to ensure the sealing.

[0028] Through this design, a compact and efficient ink circulation system is formed, which solves the problems of complex structure and difficult maintenance of the traditional ink supply system. Compared with the prior art, the circulating ink supply device proposed in the present invention has significant advantages. First, by introducing the ink stabilizing bottle 5, the influence of the pulsation of the diaphragm pump 4 on the ink supply bottle 2 is eliminated, ensuring that the nozzle obtains a stable ink flow; secondly, the sealing shaft assembly 6 is used to connect various key components to ensure the sealing of the system and the continuity of the ink flow; the function of the filter assembly 13 is to filter impurities in the ink to ensure that the ink entering the nozzle is pure, effectively solving the problem of impurities in the ink, reducing the risk of nozzle clogging, and ensuring the stable operation of the inkjet printing equipment and improving the printing quality; finally, the ink tube-free design and modular structure greatly reduce the system volume, which is convenient for flexible arrangement on the inkjet motion mechanism.

[0029] If the ink does not circulate, the printer may become clogged, the printing quality may be reduced, the printing speed may be slowed down, or even the printer may not be able to print at all. Therefore, in one embodiment, the circulating ink supply device further includes an air pipe joint 7, which connects the internal space of the housing 1 with the external space, and the air inlet end of the air pipe joint 7 is used to connect to an external air pump, and the air inlet ends of the ink supply bottle 2, the ink return bottle 3, and the ink stabilizing bottle 5 are respectively connected to the air outlet end of the air pipe joint 7. An external air pump is connected via the air pipe joint 7 to provide air pressure for the ink supply bottle 2, the ink return bottle 3 and the ink stabilizing bottle 5. By adjusting the air pressure difference between these bottles, it is ensured that the ink maintains a stable flow in the ink supply system. The pressure difference between the ink supply bottle 2 and the ink return bottle 3 causes the ink to flow from the ink supply bottle 2 to the ink return bottle 3, and the ink in the ink return bottle 3 flows back to the ink stabilizing bottle 5 through the diaphragm pump 4. The slight pressure difference between the ink stabilizing bottle 5 and the ink supply bottle 2 causes the ink to flow smoothly from the ink stabilizing bottle 5 to the ink supply bottle 2. The negative pressure gas tank or air pump inputs air pressure via the air pipe joint 7 to ensure that the pressure difference between the three ink bottles is maintained, thereby achieving stable control of the ink flow and pressure.

[0030] Preferably, the trachea connector 7 can be made of high pressure resistant material to ensure that no leakage occurs during long-term use. In addition, the interface of the trachea connector 7 can be designed as a quick connection form for easy installation and maintenance.

[0031] Ink leakage may occur at the connection part of the printer, which may cause pollution of the equipment and inconvenience in use. Therefore, in one embodiment, the sealing shaft assembly 6 includes a sealing shaft body 601 and two sealing rings 602, wherein the sealing shaft body 601 is provided with a through hole penetrating the sealing shaft body 601, wherein the through hole is used for ink to pass through, and the inner wall of the sealing ring 602 abuts against the outer wall of the sealing shaft body 601. The through hole on the sealing shaft body 601 provides a channel for the ink to pass through, and the two sealing rings 602 further enhance the sealing effect, wherein the inner wall of the sealing ring 602 abuts against the outer wall of the sealing shaft body 601, and the outer wall of the sealing ring 602 abuts against the part to be connected, which can effectively prevent the ink from leaking during the flow process. Specifically, the material of the sealing ring 602 can be selected from rubber or silicone with good elasticity and corrosion resistance, so as to ensure the durability and reliability of the seal.

[0032] If the ink does not flow into each nozzle evenly, it may cause the printing quality to decline, stripes or spots to appear, and affect the printing effect. Therefore, in one embodiment, the ink inlet connection assembly includes an ink inlet valve seat bottom plate 801, multiple ink inlet pipe joints 802 and multiple ink inlet high-frequency solenoid valves 803. The ink inlet valve seat bottom plate 801 is provided with an ink inlet ink path inside, and the ink inlet ink path is connected to the ink outlet end of the ink supply bottle 2 through the sealing shaft assembly 6. One end of the ink inlet pipe joint 802 is connected to the ink inlet ink path, and the other end of the ink inlet pipe joint 802 is used to connect to the ink inlet end of the nozzle. The ink inlet high-frequency solenoid valve 803 is arranged one-to-one with the ink inlet pipe joint 802, and the ink inlet high-frequency solenoid valve 803 is used to control the opening and closing of the ink inlet pipe joint 802. By setting the ink inlet path and the ink inlet pipe joint 802, the ink can flow into each nozzle more evenly. The setting of the ink inlet high-frequency solenoid valve 803 allows the ink flow of each nozzle to be controlled individually, thereby ensuring the uniformity of the ink flowing into the nozzle, and the flow can be cut off at any time to achieve the purpose of precise control.

[0033] Disordered ink reflux may cause changes in the ink concentration and viscosity inside the nozzle, thereby affecting the clarity and color accuracy of printing. Therefore, in one embodiment, the ink return connection assembly includes an ink return valve seat bottom plate 901, multiple ink return pipe joints 902 and multiple ink return high-frequency solenoid valves 903. The ink return valve seat bottom plate 901 is provided with an ink return ink path inside, and the ink return ink path is connected to the ink inlet end of the ink return bottle 3 through the sealing shaft assembly 6. One end of the ink return pipe joint 902 is connected to the ink return ink path, and the other end of the ink return pipe joint 902 is used to connect to the ink outlet end of the nozzle. The ink return high-frequency solenoid valve 903 is set one-to-one with the ink return pipe joint 902, and the ink return high-frequency solenoid valve 903 is used to control the opening and closing of the ink return pipe joint 902. The ink return valve seat bottom plate 901, the ink return pipe joint 902 and the ink return high-frequency solenoid valve 903 together constitute a control system for the ink to flow back from the nozzle to the ink return bottle 3. The ink return path inside the ink return valve seat bottom plate 901 forms a path for the ink to flow back. The ink return high-frequency solenoid valve 903 controls the opening and closing of the ink return pipe joint 902, thereby achieving precise control of the ink return, and solving the problem of how to control the ink to flow back from the nozzle to the ink return bottle 3.

[0034] When the diaphragm pump 4 is in a non-working state, the ink may flow backward through the diaphragm pump 4, causing the ink to flow back into the ink return bottle 3. Therefore, in one embodiment, the ink stabilizing connection assembly includes a circulating liquid replenishment base 1001 and a circulating liquid replenishment high-frequency electromagnetic valve 1002, wherein a circulating ink circuit is provided inside the circulating liquid replenishment base 1001, wherein the ink inlet end of the circulating ink circuit is connected to the ink outlet end of the ink return bottle 3 via the sealing shaft assembly 6, wherein the ink outlet end of the circulating ink circuit is connected to the ink inlet end of the diaphragm pump 4 via the sealing shaft assembly 6, wherein the circulating liquid replenishment high-frequency electromagnetic valve 1002 is provided on the circulating liquid replenishment base 1001, and wherein the circulating liquid replenishment high-frequency electromagnetic valve 1002 is used to control the opening and closing of the circulating ink circuit. The setting of the circulating liquid replenishment high-frequency solenoid valve 1002 ensures that the ink backflow is prevented by controlling the on-off of the circulating ink path during the ink circulation process, thereby ensuring the stability of the ink flow. By setting a circulating liquid replenishment base 1001 between the ink return bottle 3 and the diaphragm pump 4, and using the circulating liquid replenishment high-frequency solenoid valve 1002 to control the on-off of the flow channel of the circulating liquid replenishment base 1001, the problem of ink backflow is solved and the reliability and stability of the system are improved.

[0035] Preferably, the circulating rehydration base 1001 can be made of corrosion-resistant materials to increase its service life. The circulating rehydration high-frequency solenoid valve 1002 can select different solenoid valve models according to actual needs to adapt to different working environments and working pressures. For example, as a preferred embodiment, the circulating rehydration high-frequency solenoid valve 1002 can select a solenoid valve with a high response speed to ensure that the on-off control is completed in a short time, thereby improving the response speed and control accuracy of the system.

[0036] If the liquid level in each ink bottle is unstable, it may cause unevenness during the inkjet printing process. Therefore, in one embodiment, the circulating ink supply device also includes a plurality of liquid level sensors 11 and a plurality of sensor amplifiers 12. The liquid level sensor 11 is arranged on the outside of the ink supply bottle 2, the ink return bottle 3 and the ink stabilizing bottle 5. The liquid level sensor 11 is used to detect the liquid level in the ink supply bottle 2, the ink return bottle 3 and the ink stabilizing bottle 5. The sensor amplifier 12 is used to adjust the sensitivity of the liquid level sensor 11 so that the sensor reaches the best working state. The liquid level sensor 11 is used to detect the liquid level of the ink supply bottle 2, the ink return bottle 3 and the ink stabilizing bottle 5 in real time to ensure that the ink in these bottles is maintained at the required level. The sensor amplifier 12 ensures the accuracy and reliability of the liquid level detection by adjusting the sensitivity of the sensor, so that the system can maintain a stable liquid level, thereby ensuring that the ink flow in the nozzle is more stable.

[0037] Preferably, in order to facilitate the adjustment of the sensor amplifier 12 , a display adjustment interface of the sensor amplifier 12 is arranged on the outside of the housing 1 .

[0038] Changes in the performance and stability of the ink pump may cause the ink flow state and pressure distribution to be unstable. Therefore, in one embodiment, the diaphragm pump 4 includes a diaphragm body 401, a diaphragm cavity 402 and a driving member 403. The diaphragm body 401 is arranged in the diaphragm cavity 402. The driving member 403 drives the diaphragm body 401 to be pulled up and compressed in the diaphragm cavity 402, thereby changing the air pressure in the diaphragm cavity 402. The diaphragm cavity 402 is provided with an ink inlet 404 and an ink outlet 405. The ink inlet 404 is connected to the ink outlet end of the ink return bottle 3 through the sealing shaft assembly 6, and the ink outlet 405 is connected to the ink return end of the ink supply bottle 2 through the sealing shaft assembly 6. The driving member 403 drives the diaphragm body 401 to be pulled up and compressed in the diaphragm cavity 402, thereby changing the air pressure in the diaphragm cavity 402, so that the ink flows through the ink inlet 404 and the ink outlet 405. The sealing shaft assembly 6 ensures the sealing of the connection and prevents leakage. These features cooperate with each other to stably control the flow of ink from the ink return bottle 3 to the ink stabilizing bottle 5 under the drive of the diaphragm pump 4, so that the ink maintains a stable flow in the circulating ink supply device.

[0039] Preferably, the diaphragm pump 4 uses a stepper motor as the driving element 403 to achieve precise position control.

[0040] Preferably, the filter assembly 13 is provided with a threaded connector, the ink supply bottle 2 is provided with a threaded hole, and the filter assembly 13 is threadedly connected to the ink supply bottle 2. When the filter assembly 13 needs to be replaced, it can be easily disassembled and replaced, thereby improving the convenience of maintenance.

[0041] Preferably, the circulating ink supply device also includes an external ink filling pipe joint 14 and an ink filling high-frequency solenoid valve 15, the ink outlet end of the external ink filling pipe joint 14 is connected to the ink inlet end of the ink stabilizing bottle 5, the ink inlet end of the external ink filling pipe joint 14 is connected to the external liquid filling tank through a pipeline, and the ink filling high-frequency solenoid valve 15 is used to open and close the ink filling channel.

[0042] Preferably, the circulating ink supply device further includes an electrical connector 16 for smoothly connecting the cables of the high-frequency electromagnetic valve, the stepper motor and the sensor amplifier 12. In this way, the entire device can be removed from the motion mechanism by simply removing the female connector connected to the electrical connector 16, which is convenient for maintenance and replacement.

[0043] An inkjet printing device comprises the circulating ink supply device as described in any one of the above items.

[0044] The structure of the equipment has been greatly simplified, making maintenance work more convenient and quick. Due to the improvement of the circulation path, the ink pressure is better controlled, thereby ensuring the stability of the ink pressure, which not only improves printing efficiency, but also reduces maintenance costs, while ensuring the stability of printing quality.

[0045] The preferred embodiments of the present invention are described in detail above, but the present invention 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 this application.

Claims

1. A circulating ink supply device, characterized in that: The invention comprises a housing (1), an ink supply bottle (2), an ink inlet connection assembly, an ink return connection assembly, an ink return bottle (3), an ink stabilizing connection assembly, a diaphragm pump (4), an ink stabilizing bottle (5), a filter assembly (13), and a plurality of sealing shaft assemblies (6), all of which are arranged inside the housing (1); the ink outlet end of the ink supply bottle (2) is connected to the ink inlet end of the filter assembly (13); the ink outlet end of the filter assembly (13) is connected to the ink inlet end of the ink inlet connection assembly via the sealing shaft assembly (6); the ink outlet end of the ink inlet connection assembly is used to be connected to the ink inlet end of the nozzle; the ink inlet end of the ink return connection assembly is used to be connected to the ink inlet end of the nozzle; The ink outlet end of the nozzle is connected, the ink inlet end of the ink return bottle (3) is connected to the ink outlet end of the ink return connection assembly through a sealing shaft assembly (6), the ink outlet end of the ink return bottle (3) is connected to the ink inlet end of the ink stabilizing connection assembly through a sealing shaft assembly (6), the ink outlet end of the ink stabilizing connection assembly is connected to the ink inlet end of the diaphragm pump (4) through the sealing shaft assembly (6), the ink inlet end of the ink stabilizing bottle (5) is connected to the ink outlet end of the diaphragm pump (4) through the sealing shaft assembly (6), and the ink inlet end of the ink supply bottle (2) is connected to the ink outlet end of the ink stabilizing bottle (5) through the sealing shaft assembly (6).

2. The circulating ink supply device according to claim 1, characterized in that: The circulating ink supply device also includes an air pipe joint (7), which connects the internal space of the shell (1) with the external space. The air inlet end of the air pipe joint (7) is used to connect to an external air pump, and the air inlet ends of the ink supply bottle (2), the ink return bottle (3) and the ink stabilizing bottle (5) are respectively connected to the air outlet end of the air pipe joint (7).

3. The circulating ink supply device according to claim 1, characterized in that: The sealing shaft assembly (6) comprises a sealing shaft body (601) and two sealing rings (602); the sealing shaft body (601) is provided with a through hole penetrating the sealing shaft body (601); the through hole is used for ink to pass through; the inner wall of the sealing ring (602) abuts against the outer wall of the sealing shaft body (601).

4. The circulating ink supply device according to claim 1, characterized in that: The ink inlet connection assembly comprises an ink inlet valve seat bottom plate (801), a plurality of ink inlet pipe joints (802) and a plurality of ink inlet high-frequency solenoid valves (803); an ink inlet ink path is arranged inside the ink inlet valve seat bottom plate (801); the ink inlet ink path is connected to the ink outlet end of the ink supply bottle (2) through the sealing shaft assembly (6); one end of the ink inlet pipe joint (802) is connected to the ink inlet ink path; the other end of the ink inlet pipe joint (802) is used to be connected to the ink inlet end of the nozzle; the ink inlet high-frequency solenoid valve (803) is arranged in a one-to-one correspondence with the ink inlet pipe joint (802); the ink inlet high-frequency solenoid valve (803) is used to control the opening and closing of the ink inlet pipe joint (802).

5. The circulating ink supply device according to claim 1, characterized in that: The ink return connection assembly comprises an ink return valve seat bottom plate (901), a plurality of ink return pipe joints (902) and a plurality of ink return high-frequency solenoid valves (903); an ink return ink path is arranged inside the ink return valve seat bottom plate (901); the ink return ink path is connected to the ink inlet end of the ink return bottle (3) through the sealing shaft assembly (6); one end of the ink return pipe joint (902) is connected to the ink return ink path; the other end of the ink return pipe joint (902) is used to be connected to the ink outlet end of the nozzle; the ink return high-frequency solenoid valve (903) and the ink return pipe joint (902) are arranged in a one-to-one correspondence; the ink return high-frequency solenoid valve (903) is used to control the opening and closing of the ink return pipe joint (902).

6. The circulating ink supply device according to claim 1, characterized in that: The ink stabilizing connection assembly comprises a circulating liquid replenishing base (1001) and a circulating liquid replenishing high-frequency electromagnetic valve (1002); a circulating ink circuit is arranged inside the circulating liquid replenishing base (1001); the ink inlet end of the circulating ink circuit is connected to the ink outlet end of the ink return bottle (3) via the sealing shaft assembly (6); the ink outlet end of the circulating ink circuit is connected to the ink inlet end of the diaphragm pump (4) via the sealing shaft assembly (6); the circulating liquid replenishing high-frequency electromagnetic valve (1002) is arranged on the circulating liquid replenishing base (1001); and the circulating liquid replenishing high-frequency electromagnetic valve (1002) is used to control the opening and closing of the circulating ink circuit.

7. The circulating ink supply device according to claim 1, characterized in that: The circulating ink supply device also includes a plurality of liquid level sensors (11) and a plurality of sensor amplifiers (12). The liquid level sensors (11) are arranged on the outside of the ink supply bottle (2), the ink return bottle (3) and the ink stabilizing bottle (5). The liquid level sensors (11) are used to detect the liquid levels in the ink supply bottle (2), the ink return bottle (3) and the ink stabilizing bottle (5). The sensor amplifier (12) is used to adjust the sensitivity of the liquid level sensor (11) so that the sensor reaches an optimal working state.

8. The circulating ink supply device according to claim 1, characterized in that: The diaphragm pump (4) comprises a diaphragm body (401), a diaphragm cavity (402) and a driving member (403); the diaphragm body (401) is arranged in the diaphragm cavity (402); the driving member (403) drives the diaphragm body (401) to be pulled up and compressed in the diaphragm cavity (402), thereby changing the air pressure in the diaphragm cavity (402); the diaphragm cavity (402) is provided with an ink inlet (404) and an ink outlet (405); the ink inlet (404) is connected to the ink outlet end of the ink return bottle (3) through the sealing shaft assembly (6); the ink outlet (405) is connected to the ink return end of the ink supply bottle (2) through the sealing shaft assembly (6).

9. An inkjet printing device, characterized in that: It comprises a circulating ink supply device as described in any one of claims 1 to 8.

Images