Double-path real-time circulation system for ink

Abstract

The utility model relates to a two-way real-time circulation system for ink. The two-way real-time circulation system comprises a nozzle assembly; the ink circulating system comprises a main ink tank, a secondary ink tank, an ink inlet valve, an ink outlet valve, a recoverer and a three-position two-way valve; the main ink tank and the secondary ink tank are connected to form a primary ink circulation flow path; a second-stage ink circulation flow path is formed among the second-stage ink tank, the nozzle assembly and the recoverer; the cleaning liquid circulating system comprises a main cleaning tank, a secondary cleaning tank and a cleaning liquid inlet valve; the main cleaning tank and the secondary cleaning tank are connected to form a primary cleaning liquid circulating flow path; a second-stage cleaning liquid circulating flow path is formed among the second-stage cleaning tank, the spray head assembly and the recoverer; and the negative pressure assembly is connected with the recoverer and used for providing negative pressure. According to the utility model, double real-time circulation of cleaning liquid and ink can be realized, residual ink or cleaning liquid in the pipeline can be automatically discharged when the cleaning liquid and the ink are switched, and manual operation is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inkjet printing equipment, in particular to a double-path real-time circulation system of ink. BACKGROUND

[0002] In the inkjet printing equipment, piezoelectric ceramic nozzles are usually used for inkjet. The piezoelectric ceramic nozzles contain a large number of tiny nozzles, and the diameters of the nozzles are between tens of microns and hundreds of microns. The tiny nozzles are not conducive to the ink containing solid particles and are easy to be blocked by the deposited and agglomerated solid particles.

[0003] In the prior art, when the ink is not jetted during shutdown, the circulation of the ink is used to avoid the deposition and agglomeration of the solid particles in the ink as much as possible. However, when the shutdown lasts for a long time or the blockage occurs, the cleaning liquid needs to be used for cleaning. In the prior art, when the cleaning liquid is switched to circulate in the pipeline, the ink no longer circulates, which is easy to cause the deposition and agglomeration of the solid particles, thereby easily causing the nozzle to be blocked again in the subsequent use process; and when the cleaning liquid or the ink is switched to circulate, the remaining ink or cleaning liquid in the pipeline needs to be manually discharged, which leads to complicated operation.

[0004] Therefore, it is necessary to provide a double-path real-time circulation system capable of automatically switching the cleaning liquid and the ink and enabling the ink to still circulate when the cleaning liquid circulates in the pipeline. CONTENT OF THE UTILITY MODEL

[0005] Based on this, it is necessary to provide a double-path real-time circulation system of ink, and the specific technical scheme is as follows.

[0006] A double-path real-time circulation system of ink, characterized in that it comprises:

[0007] a nozzle assembly;

[0008] an ink circulation system comprising a main ink tank, a secondary ink tank, an ink inlet valve, an ink outlet valve, a recovery device, and a three-position two-way valve; the main ink tank is connected with the secondary ink tank to form a primary ink circulation flow path; the secondary ink tank is connected with the ink inlet valve, the ink inlet valve is connected with the nozzle assembly, the nozzle assembly is connected with the ink outlet valve, the ink outlet valve is connected with the recovery device, the recovery device is connected with the three-position two-way valve, and the three-position two-way valve is connected with the secondary ink tank, so as to form a secondary ink circulation flow path among the secondary ink tank, the nozzle assembly, and the recovery device;

[0009] The cleaning liquid circulation system comprises a main cleaning tank, a secondary cleaning tank and a cleaning liquid inlet valve; the main cleaning tank is connected with the secondary cleaning tank to form a primary cleaning liquid circulation flow path; the secondary cleaning tank is connected with the cleaning liquid inlet valve, the cleaning liquid inlet valve is connected with a nozzle assembly, a three-position two-way valve is connected with the secondary cleaning tank, so that the secondary cleaning tank, the nozzle assembly and a collector form a secondary cleaning liquid circulation flow path.

[0010] The negative pressure assembly is connected with the collector and is used for providing negative pressure.

[0011] Further, the main ink tank and the secondary ink tank are connected in parallel with an ink discharge valve and an ink delivery pump; the main cleaning tank and the secondary cleaning tank are connected in parallel with a liquid discharge valve and a cleaning liquid delivery pump.

[0012] Further, the secondary ink tank is further connected with a first pressure booster, the first pressure booster is used for driving the ink in the secondary ink tank to flow to the nozzle assembly; the secondary cleaning tank is further connected with a second pressure booster, the second pressure booster is used for driving the cleaning liquid in the secondary cleaning tank to flow to the nozzle assembly.

[0013] Further, the nozzle assembly comprises a front distributor, a rear distributor, a nozzle and a three-way valve; the nozzle is connected between the front distributor and the rear distributor, and the three-way valve is connected with the front distributor, the rear distributor and the ink outlet valve respectively.

[0014] Further, the ink inlet valve is connected with the nozzle assembly through a first one-way valve, the first one-way valve only allows the ink to flow from the ink inlet valve to the nozzle assembly; the cleaning liquid inlet valve is connected with the nozzle assembly through a second one-way valve, the second one-way valve allows the cleaning liquid to flow from the second one-way valve to the nozzle assembly.

[0015] Further, the negative pressure assembly comprises a buffer valve, a waste liquid tank and a vacuum generator; the buffer valve is connected with the collector, the waste liquid tank is connected with the buffer valve, and the vacuum generator is connected with the waste liquid tank.

[0016] Further, a recovery assembly is arranged between the collector and the nozzle assembly; the recovery assembly comprises a nozzle mounting plate and an ink recovery valve; the nozzle is mounted on the nozzle mounting plate, and the ink recovery valve is mounted between the nozzle mounting plate and the collector; the nozzle mounting plate is provided with a liquid collecting groove for recovering the ink at the nozzle during ink pressing.

[0017] Further, the collector is a gas-liquid separator.

[0018] Further, a first filter element is arranged between the ink inlet valve and the nozzle assembly; a second filter element is arranged between the cleaning liquid inlet valve and the nozzle assembly.

[0019] Further, the recycling device is provided with a circulating pump between the recycling device and the three-position two-way valve.

[0020] Beneficial effects: the double-path real-time circulation system of ink provided by the utility model, when switching to the cleaning liquid circulating in the pipeline, the ink can circulate in the primary ink circulation flow path formed between the main ink tank and the secondary ink tank, and solid particles are avoided from depositing and agglomerating as much as possible, and the subsequent nozzle is avoided from being blocked. Before switching the cleaning liquid, the ink in the secondary ink tank can be discharged into the main ink tank, and then the ink in the secondary ink circulation flow path is discharged into the secondary ink tank, so that the automatic ink in the secondary cleaning liquid circulation flow path is discharged, and manual ink discharge is not needed; conversely, the cleaning liquid in the secondary ink circulation flow path can also be automatically discharged before switching the ink; manual operation is reduced, and the utility model is more convenient and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a whole schematic view of the double-path real-time circulation system.

[0023] Figure 2 It is a schematic view of the primary ink circulation flow path.

[0024] Figure 3 It is a schematic view of the primary cleaning liquid circulation flow path.

[0025] Figure 4 It is a schematic view of the nozzle assembly and the recycling assembly.

[0026] Figure 5 It is a schematic view of the negative pressure assembly.

[0027] Legend of the drawings: 1, nozzle assembly; 2, negative pressure assembly; 3, recycling assembly;

[0028] 11, front distributor; 12, rear distributor; 13, nozzle; 14, three-way valve; 15, first one-way valve; 16, second one-way valve;

[0029] 21, buffer valve; 22, waste liquid tank; 23, vacuum generator;

[0030] 31, nozzle mounting plate; 32, ink recycling valve;

[0031] 41, main ink tank; 42, secondary ink tank; 43, ink inlet valve; 44, ink outlet valve; 45, recycler; 46, three-position two-way valve; 47, first filter element; 48, circulation pump; 49, ink delivery pump; 401, ink discharge valve; 402, first pressure booster;

[0032] 51, main cleaning tank; 52, secondary cleaning tank; 53, cleaning liquid inlet valve; 54, second filter element; 55, cleaning liquid delivery pump; 56, liquid discharge valve; 57, second pressure booster. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art in light of the foregoing description. Therefore, the present application is not limited to the following disclosed specific embodiments.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In this application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0039] Embodiment

[0040] The embodiment provides a double-path real-time circulation system of ink, referring to Fig. 1, which comprises a nozzle assembly 1, an ink circulation system, a cleaning liquid circulation system and a negative pressure assembly 2. Figure 1

[0041] Specifically, the ink circulation system comprises a main ink tank 41, a secondary ink tank 42, an ink inlet valve 43, an ink outlet valve 44, a recovery device 45 and a three-position two-way valve 46; the main ink tank 41 is connected with the secondary ink tank 42 to form a primary ink circulation flow path. The secondary ink tank 42 is connected with the ink inlet valve 43, the ink inlet valve 43 is connected with the nozzle assembly 1, the nozzle assembly 1 is connected with the ink outlet valve 44, the ink outlet valve 44 is connected with the recovery device 45, the recovery device 45 is connected with the three-position two-way valve 46, and the three-position two-way valve 46 is connected with the secondary ink tank 42, so that a secondary ink circulation flow path is formed among the secondary ink tank 42, the nozzle assembly 1 and the recovery device 45. The ink is mainly stored in the main ink tank 41, and the main ink tank 41 provides the secondary ink tank 42 with ink when the ink is pressed to print and circulates in the secondary ink circulation flow path, and additional ink is also added to the main ink tank 41. It should be noted that stirring devices can be added to the main ink tank 41 and the secondary ink tank 42 to avoid as much as possible the deposition or agglomeration of solid particles.

[0042] ​Specifically, the cleaning liquid circulation system comprises a main cleaning tank 51, a secondary cleaning tank 52 and a cleaning liquid inlet valve 53; the main cleaning tank 51 is connected with the secondary cleaning tank 52 to form a primary cleaning liquid circulation flow path; the secondary cleaning tank 52 is connected with the cleaning liquid inlet valve 53, the cleaning liquid inlet valve 53 is connected with the nozzle assembly 1, and the three-position two-way valve 46 is connected with the secondary cleaning tank 52, so that the secondary cleaning tank 52, the nozzle assembly 1 and the collector 45 form a secondary cleaning liquid circulation flow path. Correspondingly, the cleaning liquid is mainly stored in the main cleaning tank 51, and the secondary cleaning tank 52 is supplied with cleaning liquid from the main cleaning tank 51 during the cleaning liquid circulation process, and additional cleaning liquid is added to the main cleaning tank 51.

[0043] Specifically, the negative pressure assembly 2 is connected with the collector 45, and the negative pressure assembly 2 provides negative pressure to suck the ink or cleaning liquid in the pipeline of the nozzle assembly 1 and each secondary circulation flow path into the collector 45.

[0044] The double-path real-time circulation system of ink provided by the embodiment can circulate the ink in the primary ink circulation flow path between the main ink tank 41 and the secondary ink tank 42 when switching to the cleaning liquid circulation in the pipeline, so as to avoid the deposition and agglomeration of solid particles as much as possible and avoid the subsequent clogging of the nozzle 13. Before switching to the cleaning liquid, the ink in the secondary ink tank 42 can be discharged into the main ink tank 41, and then the ink in the secondary ink circulation flow path is discharged into the secondary ink tank 42, so that the automatic ink in the secondary cleaning liquid circulation flow path is discharged, thereby avoiding manual ink discharge; conversely, the cleaning liquid in the secondary ink circulation flow path can also be automatically discharged before switching to the ink, thereby reducing manual operation and being more convenient and efficient.

[0045] Specifically, referring to FIG. 1, Figure 2 Specifically, referring to FIG. 1,

[0046] Specifically, referring to FIG. 1, Figure 3As shown, the main cleaning tank 51 and the secondary cleaning tank 52 are connected in parallel with a drain valve 56 and a cleaning liquid delivery pump 55. When the cleaning liquid flows in the primary cleaning liquid circulation flow path, the drain valve 56 and the cleaning liquid delivery pump 55 are opened, so that the cleaning liquid flows between the main cleaning tank 51 and the secondary cleaning tank 52. When the cleaning liquid flows in the secondary cleaning liquid circulation flow path, the drain valve 56 is closed, and the cleaning liquid delivery pump 55 is opened, so that the cleaning liquid is delivered from the main cleaning tank 51 to the secondary cleaning tank 52. It should be noted that, in space, the height of the secondary cleaning tank 52 is higher than that of the main cleaning tank 51, so that the cleaning liquid in the secondary cleaning tank 52 can be recovered into the main cleaning tank 51 by gravity without opening the cleaning liquid delivery pump 55, but only opening the drain valve 56.

[0047] Specifically, the secondary ink tank 42 is further connected with a first pressure boosting device 402, which is used to drive the ink in the secondary ink tank 42 to flow to the printhead assembly 1. The first pressure boosting device 402 is a three-position two- normally-closed electromagnetic valve, which is connected with an air compression device, an exhaust structure, and the secondary ink tank 42. The compressed air is used to provide power for the ink to flow in the secondary ink circulation flow path.

[0048] Specifically, the secondary cleaning tank 52 is further connected with a second pressure boosting device 57, which is used to drive the cleaning liquid in the secondary cleaning tank 52 to flow to the printhead assembly 1. The second pressure boosting device 57 has the same structure and principle as the first pressure boosting device 402.

[0049] Specifically, referring to Figure 4 As shown, the printhead assembly 1 includes a front distributor 11, a rear distributor 12, a printhead 13, and a three-way valve 14. The printhead 13 is connected between the front distributor 11 and the rear distributor 12, and the three-way valve 14 is connected with the front distributor 11, the rear distributor 12, and the ink outlet valve 44. In this embodiment, the number of the printhead 13 can be three, and in other embodiments, the number of the printhead 13 can be one or more.

[0050] Specifically, the ink inlet valve 43 is connected with the printhead assembly 1 through a first one-way valve 15, which only allows the ink to flow from the ink inlet valve 43 to the printhead assembly 1. The cleaning liquid inlet valve 53 is connected with the printhead assembly 1 through a second one-way valve 16, which only allows the cleaning liquid to flow from the cleaning liquid inlet valve 53 to the printhead assembly 1. By setting the one-way valves, the backflow of the liquid in the printhead assembly 1 is prevented, so that the ink does not contaminate the secondary cleaning liquid circulation flow path when the ink circulates, and the cleaning liquid does not contaminate the secondary ink circulation flow path when the cleaning liquid circulates.

[0051] Specifically, the negative pressure assembly 2 includes a buffer valve 21, a waste liquid tank 22, and a vacuum generator 23; the buffer valve 21 is connected with the recovery device 45, the waste liquid tank 22 is connected with the buffer valve 21, and the vacuum generator 23 is connected with the waste liquid tank 22. The on-off of the vacuum generator 23 is controlled by the buffer valve 21. A small amount of liquid or gas-liquid mixture is generally recovered in the waste liquid tank 22, so as to avoid pollution to the vacuum generator 23 by the waste liquid tank 22.

[0052] It should be noted that the number of buffer valves 21 in the embodiment can be set to two, and the connection mode is parallel. The two buffer valves 21 can increase the gas flow on the one hand, and on the other hand, in the case that one of the buffer valves 21 fails, the other buffer valve 21 can still operate normally.

[0053] Specifically, the recovery assembly 3 is arranged between the recovery device 45 and the printhead assembly 1; the recovery assembly 3 includes a printhead mounting plate 31 and an ink recovery valve 32; the printhead 13 is mounted on the printhead mounting plate 31, and the ink recovery valve 32 is mounted between the printhead mounting plate 31 and the recovery device 45; the printhead mounting plate 31 is provided with a liquid collecting groove for recovering ink on the printhead 13 during ink pressing. The negative pressure provided by the negative pressure assembly 2 can recover the wasted ink during ink pressing into the recovery device 45. Specifically, the specific structure of the printhead mounting plate can refer to the prior application of the applicant, and the announcement number of the prior application is CN222246135U, and the name is a printhead 13 mounting structure for preventing sedimentation.

[0054] It should be noted that the number of ink recovery valves 32 in the embodiment can also be set to two, and the connection mode is parallel. On the one hand, the gas flow can be increased, and on the other hand, when one of the ink recovery valves 32 fails, the other ink recovery valve can still ensure normal operation.

[0055] Specifically, the recovery device 45 is a gas-liquid separator, and the ink recovered during ink pressing is a gas-liquid mixture. The gas-liquid separator is used to separate the liquid and the gas, so that the gas enters the circulation flow path.

[0056] Specifically, the first filter element 47 is arranged between the ink inlet valve 43 and the printhead assembly 1, and the second filter element 54 is arranged between the cleaning liquid inlet valve 53 and the printhead assembly 1, so as to reduce impurities entering the printhead assembly 1.

[0057] Specifically, the circulation pump 48 is arranged between the recovery device 45 and the three-position two-way valve 46. In the secondary ink circulation flow path and the secondary cleaning liquid circulation flow path, the circulation pump 48 provides power.

[0058] The different circulation states of the dual-path real-time circulation system are described as follows:

[0059] Ink circulation state: At this time, the ink discharge valve 401 is closed, the ink inlet valve 43 is opened, the ink outlet valve 44 is opened, the three-position two-way valve 46 connects the secondary ink tank 42 and the collector 45; the cleaning liquid inlet valve 53 is closed, the buffer valve 21 is closed, and the ink recovery valve 32 is closed; the ink is circulated between the secondary ink tank 42, the printhead assembly 1, and the collector 45, forming a secondary ink circulation flow path. At this time, the ink delivery pump 49 is controlled according to the amount of ink in the secondary ink tank 42 to control the on-off, and the ink is replenished in time. At this time, the cleaning liquid delivery pump 55 and the liquid discharge valve 56 are opened, so that the main cleaning tank 51 and the secondary cleaning tank 52 circulate, forming a primary cleaning liquid circulation flow path.

[0060] The cleaning liquid circulation state is opposite to the ink circulation state, and will not be described in detail.

[0061] Ink pressing state: The difference from the ink circulation state is that the ink outlet valve 44 is closed, the ink recovery valve 32 and the buffer valve 21 are opened, and the negative pressure is generated by the vacuum generator 23 to recover the wasted ink at the printhead 13 to the collector 45 during the ink pressing process.

[0062] The process of switching the ink circulation state to the cleaning liquid circulation state includes:

[0063] The ink discharge valve 401 is opened, the ink delivery pump 49 is closed, and the ink in the secondary ink tank 42 is recovered to the main ink tank 41;

[0064] The ink recovery valve 32 is closed, the ink inlet valve 43 is opened, and the buffer valve 21 is opened, and the negative pressure assembly 2 is used to recover the ink in the pipeline to the collector 45;

[0065] The ink recovery valve 32 is opened, the ink outlet valve 44 is closed, and the buffer valve 21 is opened, and the negative pressure assembly 2 is used to recover the ink in the printhead assembly 1 to the collector 45;

[0066] The recovered ink in the collector 45 is recovered to the secondary ink tank 42 by the circulating pump 48; at this time, there is no ink in the secondary cleaning liquid circulation loop;

[0067] The three-position two-way valve 46 is switched to connect the collector 45 and the secondary cleaning tank 52, the ink inlet valve 43 is closed, the cleaning liquid inlet valve 53 is opened, and the cleaning liquid in the secondary cleaning tank 52 is driven by the second booster 57 to flow in the secondary cleaning liquid circulation flow path.

[0068] The process of switching the cleaning liquid circulation state to the ink circulation state is similar to the above process, which will not be described in detail in this embodiment.

[0069] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0070] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A two-way real-time circulation system of ink, characterized by, include: Nozzle assembly; The ink circulation system includes a main ink tank, a secondary ink tank, an ink inlet valve, an ink outlet valve, a collector, and a three-position two-way valve. The main ink tank and the secondary ink tank are connected to form a primary ink circulation path. The secondary ink tank is connected to the ink inlet valve, the ink inlet valve is connected to the printhead assembly, the printhead assembly is connected to the ink outlet valve, the ink outlet valve is connected to the collector, the collector is connected to the three-position two-way valve, and the three-position two-way valve is connected to the secondary ink tank, thus forming a secondary ink circulation path among the secondary ink tank, the printhead assembly, and the collector. The cleaning fluid circulation system includes a main cleaning tank, a secondary cleaning tank, and a cleaning fluid inlet valve; the main cleaning tank and the secondary cleaning tank are connected to form a primary cleaning fluid circulation path; the secondary cleaning tank is connected to the cleaning fluid inlet valve, the cleaning fluid inlet valve is connected to the nozzle assembly, and the three-position two-way valve is connected to the secondary cleaning tank, so that a secondary cleaning fluid circulation path is formed between the secondary cleaning tank, the nozzle assembly, and the recovery unit; The negative pressure assembly, connected to the recirculator, is used to provide negative pressure.

2. The dual path real time ink circulation system of claim 1, wherein, An ink drain valve and an ink delivery pump are connected in parallel between the main ink tank and the secondary ink tank; a drain valve and a cleaning fluid delivery pump are connected in parallel between the main cleaning tank and the secondary cleaning tank.

3. The dual path real time ink circulation system of claim 1, wherein, The secondary ink tank is also connected to a first pressurizing component, which drives the ink in the secondary ink tank to flow to the printhead assembly; the secondary cleaning tank is also connected to a second pressurizing component, which drives the cleaning fluid in the secondary cleaning tank to flow to the printhead assembly.

4. The dual path real time ink circulation system of claim 1, wherein, The printhead assembly includes a front distributor, a rear distributor, a printhead, and a three-way valve; the printhead is connected between the front distributor and the rear distributor, and the three-way valve is connected to the front distributor, the rear distributor, and the ink outlet valve, respectively.

5. The dual path real time ink circulation system of claim 1, wherein, The ink inlet valve is connected to the printhead assembly via a first one-way valve, which only allows ink to flow from the ink inlet valve to the printhead assembly; the cleaning fluid inlet valve is connected to the printhead assembly via a second one-way valve, which allows cleaning fluid to flow from the second one-way valve to the printhead assembly.

6. The dual path real time ink circulation system of claim 1, wherein, The negative pressure assembly includes a buffer valve, a waste liquid tank, and a vacuum generator; the buffer valve is connected to the recovery unit, the waste liquid tank is connected to the buffer valve, and the vacuum generator is connected to the waste liquid tank.

7. A two-way real-time circulation system of ink according to claim 6, wherein A recovery assembly is provided between the recoverer and the printhead assembly; the recovery assembly includes a printhead mounting plate and an ink recovery valve; the printhead is mounted on the printhead mounting plate, and the ink recovery valve is installed between the printhead mounting plate and the recoverer; the printhead mounting plate is provided with a liquid collection tank for recovering ink at the printhead during ink pressing.

8. The dual path real time ink circulation system of claim 7, wherein, The recovery unit is a gas-liquid separator.

9. The dual path real time ink circulation system of claim 1, wherein, A first filter element is provided between the ink inlet valve and the printhead assembly; a second filter element is provided between the cleaning fluid inlet valve and the printhead assembly.

10. The dual path real time ink circulation system of claim 1, wherein, A circulation pump is provided between the recycler and the three-position two-way valve.

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