A circulating ink supply device and an inkjet printing apparatus

Abstract

The present application relates to the field of inkjet printing technology, and particularly relates to a circulating ink supply device and an inkjet printing equipment, which comprises a shell, 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 sealed shaft assemblies, which are all arranged inside the shell and connected through the sealed shaft assemblies. Through the simplified structure design and the optimized ink circulating path, the problems of complex structure, difficult maintenance, unstable ink pressure and long circulating path of the traditional ink supply system are solved, and the present application has the advantages of simplified structure, convenient maintenance, stable ink pressure and short circulating path.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing technology, and in particular to a circulating ink supply device and an inkjet printing device. BACKGROUND

[0002] Traditional ink supply system designs are usually complex in structure, consisting of numerous levels and complex pipelines. Such designs not only significantly increase the overall complexity of the system, but also make routine maintenance and fault diagnosis extremely difficult. Each added level and each extended pipeline brings more potential failure points and higher maintenance costs. Such complex structural design not only increases production costs, but also reduces the reliability and stability of the system.

[0003] In an ink circulating system, the ink extraction pump is a key component that drives the circulation of ink. However, the ink extraction pump is directly connected in series in the ink path, which results in the flow and pressure control of the ink being completely dependent on the performance and stability of the ink extraction pump. Since the ink extraction 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 correlation makes it extremely difficult to stably control the ink pressure. Unstable ink pressure can cause fluctuations in print quality, and even cause serious problems such as damage to the inkjet head or ink leakage. SUMMARY

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

[0005] The solution to the technical problem of the present application is a circulating ink supply device, which comprises a housing and an ink supply bottle, an ink inlet connection assembly, an ink return connection assembly, an ink return bottle, an ink stabilizing connection assembly, a diaphragm pump, an ink stabilizing bottle, a filter assembly and a plurality of sealed shaft assemblies, all of which are arranged inside the housing. 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 connection assembly through a sealed shaft assembly, the ink outlet end of the ink inlet connection assembly is used to connect to the ink inlet end of the inkjet head, the ink inlet end of the ink return connection assembly is used to connect to the ink outlet end of the inkjet head, the ink inlet end of the ink return bottle is connected to the ink outlet end of the ink return connection assembly through a sealed shaft assembly, the ink outlet end of the ink return bottle is connected to the ink inlet end of the ink stabilizing connection assembly through a sealed shaft assembly, the ink outlet end of the ink stabilizing connection assembly is connected to the ink inlet end of the diaphragm pump through the sealed shaft assembly, the ink inlet end of the ink stabilizing bottle is connected to the ink outlet end of the diaphragm pump through the sealed 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 sealed shaft assembly.

[0006] As a further improvement of the above technical solution, the circulating ink supply device further comprises an air pipe joint, which communicates the internal space of the shell with the external space, and the air inlet end of the air pipe joint is used for connecting with an external air pump, and the air inlet ends of the ink supply bottle, the ink return bottle and the ink stabilizing bottle are respectively connected with the air outlet ends of the air pipe joint.

[0007] As a further improvement of the above technical solution, the sealing shaft assembly comprises a sealing shaft body and two sealing rings, the sealing shaft body is provided with a through hole penetrating the sealing shaft body, the through hole is used for passing ink, and the inner wall of the sealing ring is in abutment with the outer wall of the sealing shaft body.

[0008] As a further improvement of the above technical solution, the ink inlet connecting assembly comprises an ink inlet valve seat bottom plate, a plurality of ink inlet pipe joints and a plurality of ink inlet high-frequency electromagnetic valves, the ink inlet valve seat bottom plate is internally provided with an ink inlet ink channel, the ink inlet ink channel is communicated with the ink outlet end of the ink supply bottle through the sealing shaft assembly, one end of the ink inlet pipe joint is communicated with the ink inlet ink channel, the other end of the ink inlet pipe joint is used for connecting with the ink inlet end of the inkjet head, the ink inlet high-frequency electromagnetic valve is arranged in one-to-one correspondence with the ink inlet pipe joint, and the ink inlet high-frequency electromagnetic valve is used for controlling the opening and closing of the ink inlet pipe joint.

[0009] As a further improvement of the above technical solution, the ink return connecting assembly comprises an ink return valve seat bottom plate, a plurality of ink return pipe joints and a plurality of ink return high-frequency electromagnetic valves, the ink return valve seat bottom plate is internally provided with an ink return ink channel, the ink return ink channel is communicated with the ink inlet end of the ink return bottle through the sealing shaft assembly, one end of the ink return pipe joint is communicated with the ink return ink channel, the other end of the ink return pipe joint is used for connecting with the ink outlet end of the inkjet head, the ink return high-frequency electromagnetic valve is arranged in one-to-one correspondence with the ink return pipe joint, and the ink return high-frequency electromagnetic valve is used for controlling the opening and closing of the ink return pipe joint.

[0010] As a further improvement of the above technical solution, the ink stabilizing connecting assembly comprises a circulating liquid supplement base and a circulating liquid supplement high-frequency electromagnetic valve, the circulating ink channel is internally provided with a circulating ink channel, the ink inlet end of the circulating ink channel is connected with the ink outlet end of the ink return bottle through the sealing shaft assembly, the ink outlet end of the circulating ink channel is connected with the ink inlet end of the diaphragm pump through the sealing shaft assembly, the circulating liquid supplement high-frequency electromagnetic valve is arranged on the circulating liquid supplement base, and the circulating liquid supplement high-frequency electromagnetic valve is used for controlling the opening and closing of the circulating ink channel.

[0011] As a further improvement of the above technical solution, the circulating ink supply device further comprises a plurality of liquid level sensors and a plurality of sensor amplifiers, the liquid level sensors are arranged outside the ink supply bottle, the ink return bottle and the ink stabilizing bottle, the liquid level sensors are used to detect the liquid level in the ink supply bottle, the ink return bottle and the ink stabilizing bottle, and the sensor amplifiers are used to adjust the sensitivity of the liquid level sensors to make the sensors reach the best working state.

[0012] As a further improvement of the above technical solution, the diaphragm pump comprises a diaphragm body, a diaphragm cavity and a driving member, the diaphragm body is arranged in the diaphragm cavity, the driving member drives the diaphragm body to lift and compress in the diaphragm cavity, thereby changing the air pressure in the diaphragm cavity, the diaphragm cavity is provided with an ink inlet and an ink outlet, the ink inlet is connected with the ink outlet end of the ink return bottle through the sealing shaft assembly, and the ink outlet is connected with 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 according to any one of the above.

[0014] The circulating ink supply device provided by the application 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 inside the shell, through the simplified structure design and the optimized ink circulation path, the problems of the traditional ink supply system, such as complex structure, difficult maintenance, unstable ink pressure and long circulation path, are solved, and the advantages of structure simplification, convenient maintenance, stable ink pressure and short circulation path are achieved. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

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

[0020] Figure 6 is a sectional view of the sealing shaft assembly.

[0021] In the 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 supplement base, 1002 - circulating liquid supplement high-frequency solenoid valve, 11 - liquid level sensor, 12 - sensor amplifier, 13 - filter assembly, 14 - external ink filling pipe joint, 15 - ink filling high-frequency solenoid valve, 16 - electrical joint. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the embodiments description are briefly described above. Obviously, the described drawings are only a part of the embodiments of the present application, not all embodiments, and those skilled in the art can obtain other design schemes and drawings from these drawings without creative labor.

[0023] The concept, specific structure and technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments, and other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor are within the scope of protection of the present application. In addition, all the coupling / connection relationships mentioned in the text do not mean that the components are directly connected, but that a better coupling structure can be composed by adding or reducing coupling accessories according to the specific implementation situation. The various technical features in the present application can be combined interactively without mutual contradiction and conflict.

[0024] The traditional ink supply system design usually has a complex structure, which is composed of many levels and complex pipelines. Such design not only significantly improves the overall complexity of the system, but also makes the daily maintenance and fault diagnosis extremely difficult. Each layer increase and each pipeline extension brings more potential failure points and higher maintenance cost. Such complex structure design not only increases the production cost, but also reduces the reliability and stability of the system.

[0025] In the ink circulation system, the ink pump is the key component to push the ink circulation. However, the ink pump is directly connected in series in the ink path, which leads to the flow and pressure control of the ink completely depending on the performance and stability of the ink pump. Since the ink pump directly affects the ink, any change in the working state of the ink pump will directly affect the flow state and pressure distribution of the ink. This direct correlation makes it extremely difficult to stably control the ink pressure. The instability of the ink pressure can cause fluctuations in the printing quality, and even cause serious problems such as damage to the nozzle or leakage of the ink.

[0026] To this end, the present application provides a circulating ink supply device, referring to Figures 1-6 which comprises a shell 1 and an ink supply bottle 2, an ink inlet connecting assembly, an ink return connecting assembly, an ink return bottle 3, an ink stabilizing connecting 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 shell 1, the ink outlet end of the ink supply bottle 2 is connected with the ink inlet end of the filter assembly 13, the ink outlet end of the filter assembly 13 is connected with the ink inlet end of the ink inlet connecting assembly through the sealing shaft assembly 6, the ink outlet end of the ink inlet connecting assembly is used to connect with the ink inlet end of the nozzle, the ink inlet end of the ink return connecting assembly is used to connect with the ink outlet end of the nozzle, the ink inlet end of the ink return bottle 3 is connected with 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 with 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 with 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 with 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 with the ink outlet end of the ink stabilizing bottle 5 through the sealing shaft assembly 6.

[0027] Specifically, the ink flows from the ink supply bottle 2 into the filter assembly 13, the filter assembly 13 filters the ink, and then the ink flows into the ink inlet connecting assembly, the ink inlet connecting assembly divides the ink into each nozzle for printing, the ink flowing out of the nozzle enters the ink return connecting assembly and is gathered into the ink return bottle 3; when it is necessary to replenish the ink in the ink supply bottle 2, the ink flows out of the ink return bottle 3, enters the diaphragm pump 4 through the ink stabilizing connecting 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, and the sealing shaft assembly 6 is used between each component to ensure the sealing.

[0028] With this design, a compact and efficient ink circulation system is formed, solving the problems of complex structure and difficult maintenance of traditional ink supply systems. Compared with the prior art, the circulating ink supply device proposed by the present application has significant advantages. First, by introducing the ink stabilizing bottle 5, the influence of the diaphragm pump 4 pulsation on the ink supply bottle 2 is eliminated, ensuring that the ink head obtains stable ink flow; second, the sealed shaft assembly 6 is used to connect the various key components, ensuring the sealing of the system and the continuity of the ink flow; the filter assembly 13 filters impurities in the ink, ensuring that the ink entering the ink head is pure, effectively solving the problem of impurities in the ink, reducing the risk of ink head blockage, and ensuring the stable operation of the inkjet printing equipment and the improvement of the printing quality; finally, the design of no ink tube and modular structure greatly reduces the system volume, facilitating flexible arrangement on the inkjet motion mechanism.

[0029] Ink non-circulation flow may cause printer to be blocked, printing quality to be reduced, printing speed to be slowed down, and even completely unable to print. Therefore, in an embodiment, the circulating ink supply device further comprises an air pipe joint 7, which communicates 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 with the 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 connected with the air outlet ends of the air pipe joint 7 respectively. By connecting the external air pump through the air pipe joint 7, air pressure is provided for the ink supply bottle 2, the ink return bottle 3 and the ink stabilizing bottle 5, and by adjusting the air pressure difference of these bottles, the stable flow of ink in the ink supply system is ensured. The pressure difference between the ink supply bottle 2 and the ink return bottle 3 promotes the flow of ink 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 small pressure difference between the ink stabilizing bottle 5 and the ink supply bottle 2 makes the ink flow smoothly from the ink stabilizing bottle 5 to the ink supply bottle 2. The negative pressure tank or air pump inputs air pressure through the air pipe joint 7, ensuring that the pressure difference between the three ink bottles is maintained, thereby realizing stable control of ink flow and pressure.

[0030] Preferably, the air pipe joint 7 can be made of high-pressure resistant material to ensure that it does not leak during long-term use. In addition, the interface of the air pipe joint 7 can be designed in the form of quick connection, facilitating installation and maintenance.

[0031] The connection part of the printer can have ink leakage, which can cause pollution and inconvenience of the device. Thus, in an embodiment, the sealing shaft assembly 6 includes 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, 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. 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 component to be connected, which can effectively prevent ink leakage during flow. Specifically, the material of the sealing ring 602 can be selected from rubber or silicone with good elasticity and corrosion resistance, which can ensure the durability and reliability of the sealing.

[0032] If the ink does not flow uniformly into each nozzle, it can cause the printing quality to decrease, appear stripes or spots, and affect the printing effect. Thus, in an embodiment, the ink inlet connection assembly includes an ink inlet valve seat bottom plate 801, a plurality of ink inlet pipe joints 802, and a plurality of ink inlet high-frequency electromagnetic valves 803, the ink inlet valve seat bottom plate 801 is internally provided with an ink inlet ink path, the ink inlet ink path is communicated with 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 communicated with the ink inlet ink path, the other end of the ink inlet pipe joint 802 is used to connect with the ink inlet end of the nozzle, the ink inlet high-frequency electromagnetic valve 803 is provided one-to-one corresponding to the ink inlet pipe joint 802, and the ink inlet high-frequency electromagnetic valve 803 is used to control the opening and closing of the ink inlet pipe joint 802. By providing the ink inlet ink path and the ink inlet pipe joint 802, the ink can flow more uniformly into each nozzle, and by providing the ink inlet high-frequency electromagnetic valve 803, the ink flow of each nozzle can be controlled individually, thereby ensuring the uniformity of the ink flowing into the nozzle and being able to cut off the flow at any time to achieve the purpose of precise control.

[0033] Disordered ink backflow may cause changes in the ink concentration and viscosity inside the nozzle, thereby affecting the clarity and color accuracy of the print. Therefore, in one embodiment, the ink return connection assembly includes an ink return valve seat base plate 901, multiple ink return pipe joints 902, and multiple ink return high-frequency solenoid valves 903. The ink return valve seat base 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 in a one-to-one correspondence 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 ink path inside the ink return valve seat bottom plate 901 forms the ink return path. The ink return high-frequency solenoid valve 903 controls the opening and closing of the ink return pipe joint 902, thereby realizing 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 not in operation, reverse flow of ink through the diaphragm pump 4 may occur, 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 replenishing base 1001 and a circulating liquid replenishing high-frequency solenoid valve 1002. A circulating ink circuit is provided 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 solenoid valve 1002 is provided on the circulating liquid replenishing base 1001 and is used to control the opening and closing of the circulating ink circuit. The setting of the circulating rehydration 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 the circulating rehydration base 1001 between the ink return bottle 3 and the diaphragm pump 4, and using the circulating rehydration high-frequency solenoid valve 1002 to control the on-off of the flow channel of the circulating rehydration base 1001, the problem of ink backflow is solved and the reliability and stability of the system are improved.

[0035] Preferably, the circulating replenishment base 1001 can be made of corrosion-resistant materials to improve its service life. The circulating replenishment high-frequency electromagnetic valve 1002 can select different electromagnetic valve models according to actual needs to adapt to different working environments and working pressures. For example, as a preferred embodiment, the circulating replenishment high-frequency electromagnetic valve 1002 can select a high-response-speed electromagnetic valve 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 uneven phenomenon in the inkjet printing process. Therefore, in an embodiment, the circulating ink supply device further comprises a plurality of liquid level sensors 11 and a plurality of sensor amplifiers 12, the liquid level sensors 11 are arranged outside 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 level in the ink supply bottle 2, the ink return bottle 3 and the ink stabilizing bottle 5, and the sensor amplifiers 12 are used to adjust the sensitivity of the liquid level sensors 11 to make the sensors reach the best working state. The liquid level sensors 11 are 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 maintains the required level, and the sensor amplifiers 12 adjust the sensitivity of the sensors to ensure the accuracy and reliability of the liquid level detection, 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, the display adjustment interface of the sensor amplifier 12 is arranged outside the shell 1.

[0038] The performance and stability changes of the ink extraction pump may cause the ink flow state and pressure distribution to be unstable. Therefore, in an embodiment, 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 lift and compress 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 with the ink outlet end of the ink return bottle 3 through the sealing shaft assembly 6, and the ink outlet 405 is connected with 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 lift and compress 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 to prevent 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 flows stably in the circulating ink supply device.

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

[0040] Preferably, the filter assembly 13 is provided with a threaded connector, and the ink supply bottle 2 is provided with a threaded hole. 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 adding pipe joint 14 and an ink adding high-frequency solenoid valve 15, the ink outlet end of the external ink adding pipe joint 14 is connected to the ink inlet end of the ink stabilizing bottle 5, and the ink inlet end of the external ink adding pipe joint 14 is connected to the external liquid adding tank through a pipeline, and the ink adding high-frequency solenoid valve 15 is used to open and close the ink adding channel.

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

[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. This not only improves printing efficiency, but also reduces maintenance costs, while ensuring the stability of print quality.

[0045] The above specifically describes the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can 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 shell (1) and an ink supply bottle (2), an ink inlet connection assembly, an ink return connection assembly, an ink return bottle (3), an ink stabilization connection assembly, a diaphragm pump (4), an ink stabilization bottle (5), a filter assembly (13) and a plurality of sealing shaft assemblies (6) all arranged inside the shell (1), wherein 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, and 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); 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 allowing ink to pass through; the inner wall of the sealing ring (602) abuts against the outer wall of the sealing shaft body (601); 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 provided inside the circulating liquid replenishing base (1001); an ink inlet end of the circulating ink circuit is connected to an ink outlet end of the ink return bottle (3) via the sealing shaft assembly (6); an ink outlet end of the circulating ink circuit is connected to an ink inlet end of the diaphragm pump (4) via the sealing shaft assembly (6); the circulating liquid replenishing high-frequency electromagnetic valve (1002) is provided 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.

2. The circulating ink supply device according to claim 1, characterized in that: The circulating ink supply device further comprises an air pipe joint (7), wherein the air pipe joint (7) 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 be connected to an external air pump, and the air inlet ends of the ink supply bottle (2), the ink return bottle (3) and the ink stabilization 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 ink inlet connection assembly comprises an ink inlet valve seat base plate (801), a plurality of ink inlet pipe joints (802) and a plurality of ink inlet high-frequency solenoid valves (803); an ink inlet path is provided inside the ink inlet valve seat base plate (801); the ink inlet 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 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 provided in a one-to-one correspondence 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).

4. 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 provided 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 provided 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).

5. The circulating ink supply device according to claim 1, characterized in that: The circulating ink supply device further comprises 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 amplifiers (12) are used to adjust the sensitivity of the liquid level sensors (11) so that the sensors reach an optimal working state.

6. 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), wherein the diaphragm body (401) is arranged in the diaphragm cavity (402), and the driving member (403) drives the diaphragm body (401) to be stretched and compressed in the diaphragm cavity (402), thereby changing the air pressure in the diaphragm cavity (402), and the diaphragm cavity (402) is provided with an ink inlet (404) and an ink outlet (405), wherein 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).

7. An inkjet printing device, characterized in that: It comprises the circulating ink supply device as described in any one of claims 1-6.

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