Ink distributing device, ink path circulating system, printing equipment and printing production line

Abstract

The utility model belongs to the technical field of printing equipment, and particularly relates to an ink distributing device, an ink path circulating system, printing equipment and a printing production line. The shell is provided with an ink supply port communicated with the containing cavity, the bottom of the shell is provided with a plurality of flow dividing ports communicated with the containing cavity, the lengths of paths from the ink supply port to the flow dividing ports are the same, the bottom wall of the containing cavity is provided with a flow blocking assembly, and the flow dividing ports enclose the flow blocking assembly to prevent ink flowing out of the ink supply port from directly flowing into the flow dividing ports. Ink enters the containing cavity from the ink supply port of the ink distributing device to be temporarily stored, the ink flows to the different flow distributing ports along the flow paths in the ink distributing device, and due to the fact that the paths from the ink supply port to the flow distributing ports are the same and buffering and flow distributing are conducted through the flow blocking assembly, under the same ink supply pressure, the ink can be supplied to the ink distributing device through the flow blocking assembly. The ink can be uniformly dispersed to each diversion port, so that the ink jet rate of each nozzle is ensured to be the same, and the ink jet printing effect is improved to a certain extent.

Description

Technical Field

[0001] This application belongs to the technical field of printing equipment, and particularly relates to an ink distribution device, an ink circuit circulation system, a printing device, and a printing production line. Background Art

[0002] A UV printing device is a printing device that realizes fast and high-quality printing through ultraviolet curing technology. The print head sprays tiny ink droplets according to image data, and these ink droplets land on the surface of the printing medium. The UV lamp installed near the print head emits ultraviolet light, causing the photosensitizer in the ink liquid to undergo a chemical reaction and quickly solidify into a solid ink layer, achieving the effect of drying immediately after printing.

[0003] UV printing devices often work with multiple print heads synchronously. In related technologies, generally, different branches are connected at different positions on the ink supply pipe of the ink cartridge to separately transport the ink liquid to different print heads. As the ink liquid is continuously branched, the ink liquid pressure and flow rate in each branch are often not the same, resulting in uneven inkjet printing effects. Summary of the Utility Model

[0004] This application aims to at least solve to some extent the technical problem that the uneven inkjet printing effect is caused by different ink liquid pressures and flow rates of each print head. For this reason, this application provides an ink distribution device, an ink circuit circulation system, a printing device, and a printing production line.

[0005] In a first aspect, an embodiment of this application provides an ink distribution device, including a housing and a flow blocking component; a receiving cavity is formed in the housing, an ink supply port communicating with the receiving cavity is provided on the housing, and a plurality of diversion ports communicating with the receiving cavity are formed at the bottom of the housing; the flow blocking component is located on the bottom wall of the receiving cavity, and each of the diversion ports surrounds the flow blocking component. The flow blocking component is used to block the diverted ink liquid flowing from the ink supply port to each of the diversion ports, so that the flow paths of the diverted ink liquid are of the same length.

[0006] Through the ink distribution device, ink circuit circulation system, printing device, and printing production line provided by this application, during printing, the ink liquid enters the receiving cavity from the ink supply port of the ink distribution device for temporary storage. The ink liquid flows along the flow paths in the ink distribution device to different diversion ports respectively. Due to the setting of the flow blocking component, the flow paths of the diverted ink liquid between the ink supply port and each diversion port are the same. Therefore, under the same ink supply pressure, each diverted ink liquid can be evenly dispersed to each diversion port and then transported to each print head through the diversion port, thereby ensuring that the inkjet rates of each print head are the same and improving the inkjet printing effect to some extent.

[0007] In some embodiments, the cross-section of the receiving cavity is a centrally symmetric figure.

[0008] In some embodiments, the plurality of diversion ports are arranged at equal intervals centered on the axis of the ink supply port.

[0009] In some embodiments, the flow blocking assembly includes a plurality of flow blocking sheets, each flow blocking sheet is arranged in one-to-one correspondence with each diversion port, and each of the flow blocking sheets is arranged at the corresponding diversion port, so that the effect of ink being diverted when reaching each ink supply port is the same, and the diversion effect is more uniform. The plurality of flow blocking sheets are all arranged between the ink supply port and the plurality of diversion ports, so that the diverted ink cannot directly flow in a straight line from the ink supply port to the diversion port, so that the flow blocking assembly plays a role in buffering and diverting the ink.

[0010] In some embodiments, taking the plurality of flow blocking sheets as a group, each group of flow blocking sheets is annularly distributed centered on the hole center of the ink supply port to form multi-layer annular enclosures with different diameters, and the gaps of the enclosures with different diameters are arranged in a staggered manner in the diameter direction of the ink supply port.

[0011] In some embodiments, an air hole is opened at the top of the outer shell, the air hole is communicated with the accommodating cavity, and a liquid stop and exhaust valve is arranged in the air hole.

[0012] In a second aspect, an embodiment of the present application provides an ink path circulation system, which includes at least two cooperating ink distribution devices as described above, wherein at least one of the ink distribution devices is an ink supply and diversion device, and at least one ink distribution device is a return ink and diversion device, wherein:

[0013] The ink supply port of the ink supply and diversion device is connected to the ink supply end of an external ink supply assembly, and the plurality of diversion ports are connected to the ink supply ends of external ink using assemblies;

[0014] The plurality of diversion ports of the return ink and diversion device are connected to the return ink ends of the external ink using assemblies, and the ink supply port is connected to the return ink end of the external ink supply assembly.

[0015] In a third aspect, an embodiment of the present application provides an ink distribution device including an external ink supply assembly and an external ink using assembly, and also includes the ink distribution device as described above.

[0016] In a fourth aspect, an embodiment of the present application provides a printing production line, which includes the printing device as described above. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1Shows the overall schematic diagram of the ink distribution device in the present application;

[0019] Figure 2 Shows the exploded schematic diagram of the ink distribution device in the present application;

[0020] Figure 3 Shows the top view of the housing of the present application.

[0021] Reference numerals: 1, outer shell; 11, top cover; 12, housing; 13, sealing ring; 2, accommodating cavity; 21, ink supply port; 22, shunt port; 3, flow blocking assembly; 4, air hole; 41, liquid stop exhaust valve; 5, pressure sensor. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that all the directional indications in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly. In the present utility model, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, the descriptions such as "first" and "second" in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0024] Next, the present application will be described in conjunction with the accompanying drawings and with reference to specific embodiments:

[0025] UV printing equipment is a printing device that achieves fast and high-quality printing through ultraviolet curing technology. The print head ejects tiny ink droplets according to the image data. These ink droplets land on the surface of the printing medium. The UV lamp installed near the print head emits ultraviolet light, causing the photosensitizer in the ink to undergo a chemical reaction and quickly solidify into a solid ink layer, achieving the effect of drying immediately after printing.

[0026] In the field of battery production, the surface of the battery generally needs to be coated with a PET blue film. Therefore, this application adopts battery inkjet UV printing technology to spray the liquid ink of the blue film material on the surface of the battery to form a battery blue film. During the spraying process, multiple nozzles generally work simultaneously to form a continuous and flat blue film on the surface of the battery. Multiple nozzles share the same ink cartridge. When supplying ink to multiple nozzles, generally, multiple shunt tubes are arranged on a single ink inlet tube, and each shunt tube corresponds to one nozzle. The ink flows through each shunt tube in sequence and then is shunted to each nozzle. However, during the shunting process, due to the different positions of the shunt tubes on the ink inlet tube, the ink pressure received by the front shunt tube is generally greater than that of the rear shunt tube, which results in different ink pressures and ink flow rates in each nozzle, leading to uneven inkjet printing effects.

[0027] Therefore, this application provides an ink supply damper, an ink supply assembly, a printing device, and a printing production line, which can at least solve the technical problem of uneven inkjet of the print head to a certain extent. At the same time, the ink distribution device, ink path circulation system, printing device, and printing production line provided by this application can also be applied to the fields of film spraying, PCB boards and internal circuit diagrams, 3D printing, printing of industrial materials such as circuit boards, electronic components, and mechanical parts, or other fields such as interior decoration.

[0028] Embodiment 1: The embodiment of this application provides an ink distribution device. Refer to Figure 1 and Figure 2 , which includes a housing 1. A hollow accommodation cavity 2 is formed inside the housing 1 for temporarily accommodating ink. Specifically, the housing 1 includes a top cover 11 and a housing body 12. The top cover 11 is fixedly installed on the top of the housing body 12 through bolts to form a sealed accommodation cavity 2. A sealing ring 13 is provided between the top cover 11 and the housing body 12 to improve the sealing performance of the entire housing 1.

[0029] The housing 1 is provided with an ink supply port 21 communicating with the accommodation cavity 2. The ink supply port 21 is used to communicate with an ink cartridge or other ink storage ends through an external ink supply pipeline. A plurality of shunt ports 22 communicating with the accommodation cavity 2 are formed at the bottom of the housing 1. Each shunt port 22 is respectively communicated with a nozzle assembly or other external ink-using assemblies through an external shunt pipeline. Among them, the path lengths from the ink supply port 21 to each shunt port 22 are the same, that is, the actual flow path lengths of the ink flowing from the ink supply port 21 to each shunt port 22 are the same, so that the ink can flow to each shunt port 22 at the same rate after entering the accommodation cavity 2, and the diameters of the respective shunt ports 22 are the same. Therefore, the pressures when the ink flows out of each shunt port 22 in the accommodation cavity 2 are also the same, thus ensuring that the flow rates and pressures of the ink flowing out of each shunt port 22 are the same. A connector is provided on the ink supply port 21 for connecting with an external pipeline. The same type of connectors are also provided on each shunt port 22 respectively for connecting with different nozzles or other external ink-using assemblies.

[0030] In this embodiment, the ink supply port 21 is opened at the top of the accommodation cavity 2, and a plurality of shunt ports 22 are all opened at the bottom opposite to the ink supply port 21, and each shunt port 22 is offset from the ink supply port 21 in the axial direction of the ink supply port 21 to prevent the ink from flowing directly out of the shunt port 22 after entering. After the ink enters the accommodation cavity 2 through the ink supply port 21, it first contacts the bottom wall of the accommodation cavity 2 or the ink liquid level along the axial direction. At this time, the ink flows to each shunt port 22 along the corresponding paths of the respective shunt ports 22. The flow path of the shunt ink flowing to each shunt port 22 can be a straight line or a curve, that is, the plurality of shunt ports 22 can be set to have the same straight-line distance from the ink supply port 21, or when the straight-line distances of the plurality of shunt ports 22 from the ink supply port 21 are different, different flow-blocking components 3 can be set according to the different distances to make the actual flow paths of the ink the same.

[0031] Refer to Figure 2 and Figure 3 The ink distribution device further includes a flow-blocking component 3. The flow-blocking component 3 is located on the bottom wall of the accommodation cavity 2, and each shunt port 22 surrounds the flow-blocking component 3, that is, the flow-blocking component 3 is located between the ink supply port 21 and each shunt port 22, and is used to block the shunt ink flowing from the ink supply port 21 to each shunt port 22 to make the flow path distances of the respective shunt inks the same. After the ink enters the accommodation cavity 2 through the ink supply port 21, due to the pressure during pumping and the influence of the self-gravity of the ink, there is a certain pressure fluctuation in the ink, and then the ink in the accommodation cavity 2 fluctuates. Therefore, a flow-blocking component 3 is arranged between the ink supply port 21 and the shunt port 22 to block and buffer the ink, absorb the flow fluctuation and impact force of the ink, so that the ink is more stable during the flowing process and avoid the influence of the ink fluctuation on the flow rates of each shunt port 22.

[0032] In some embodiments, an air hole 4 is provided at the top of the housing 1. The air hole 4 communicates with the accommodation cavity 2. A liquid-stop exhaust valve 41 is arranged in the air hole 4, which includes an exhaust pipe and a plurality of floating balls. A floating cavity with a diameter larger than the pipe orifice of the exhaust pipe is arranged in the exhaust pipe. The plurality of floating balls are slidably arranged in the floating cavity. When ink enters the accommodation cavity 2, the floating balls are located at the bottom of the floating cavity under the action of gravity, and gas can flow out through the exhaust pipe. When the accommodation cavity 2 is filled with ink, the floating balls float upward in the ink, thereby blocking the air hole 4 to prevent the ink from flowing out. A pressure sensor 5 for detecting the internal pressure of the accommodation cavity 2 is arranged at the top of the housing 1. The pressure sensor 5 can be connected to the ink supply system of the ink through a feedback adjustment circuit, so as to adjust the ink supply amount according to the ink pressure in the accommodation cavity 2.

[0033] In some embodiments, referring to Figure 2 and Figure 3 , the cross-section of the accommodation cavity 2 is a centrally symmetric figure. In this embodiment, the cross-section of the accommodation cavity 2 is circular, that is, the accommodation cavity 2 is a cylindrical cavity. The ink supply port 21 can be arranged at the axis position of the accommodation cavity 2, that is, the ink supply port 21 is located at the central position. After the ink is injected from the ink supply port 21, it flows around, and the side walls of the surrounding accommodation cavity 2 have the same limiting effect on the ink, so that the ink is dispersed more evenly. The cross-section of the accommodation cavity 2 can also be rectangular. For example, when there are four shunt ports 22, the four shunt ports 22 can be arranged in a rectangular shape, and the four shunt ports 22 are respectively located at the four corners of the rectangle to achieve the effect of uniform shunting.

[0034] In other embodiments, the cross-section of the accommodation cavity 2 can also be in the shape of other non-centrally symmetric figures, which can be specifically determined according to the actual situation, the number and arrangement of the shunt ports 22. For example, the cross-section can be a polygon with the number of shunt ports 22. Specifically, for example, when there are three shunt ports 22, the three shunt ports 22 can be arranged in an equilateral triangle distribution, and the ink supply port 21 is arranged at the center of the triangle. The ink supply port 21 is coaxially arranged with the center of the rectangle; or the linear distances between the plurality of shunt ports 22 and the ink supply port 21 can also be set differently. At this time, a curved flow path can be arranged between the ink supply port 21 and the shunt port 22 that is close to the ink supply port 21, so that the actual paths of the ink flowing to each shunt port 22 are the same to achieve the effect of uniform shunting.

[0035] In some embodiments, referring to Figure 2 and Figure 3, a plurality of flow diversion ports 22 are arranged at equal intervals with the axis of the ink supply port 21 as the center point, that is, the distances between the plurality of flow diversion ports 22 and the ink supply port 21 are equal. Further, the plurality of flow diversion ports 22 are distributed in a ring around the axis of the ink supply port 21, and the plurality of flow diversion ports 22 are evenly spaced along the circumferential direction. After the ink liquid enters through the ink supply port 21, it is evenly dispersed around, and then flows out from the flow diversion ports 22 that are evenly spaced and at equal distances around, so as to make the ink liquid flow distribution from each flow diversion port 22 more uniform to the greatest extent; in other embodiments, the flow diversion ports 22 can also be distributed in other forms, for example, the plurality of flow diversion ports 22 are distributed in a fan shape, etc.

[0036] According to different actual situations, the ink supply port 21 and the flow diversion ports 22 can also be opened on other side walls of the accommodating cavity 2. For example, the ink supply port 21 and the flow diversion ports 22 can be opened on the bottom wall of the accommodating cavity 2 at the same time, and the ink supply port 21 is located at the center position of the plurality of flow diversion ports 22; or the ink supply port 21 can be opened on the top or bottom of the accommodating cavity 2, and the flow diversion ports 22 can be opened on the side wall of the accommodating cavity 2. The flow diversion ports 22 are located at the same height position and are evenly spaced along the circumferential direction of the accommodating cavity 2 to achieve the effect of uniform flow diversion.

[0037] In some embodiments, the flow blocking assembly 3 includes a plurality of flow blocking sheets, each flow blocking sheet is arranged corresponding to each flow diversion port, and each flow blocking sheet is arranged at the corresponding flow diversion port 22. Specifically, in this embodiment, the cross-section of the flow blocking sheet is arc-shaped, and the plurality of flow blocking sheets enclose a circular enclosure. Each flow blocking sheet is adjacent to one side of the corresponding flow diversion port 22, and the distance between each flow blocking sheet and the corresponding flow diversion port 22 is the same. There are gaps for the ink liquid to flow between adjacent two flow blocking sheets, and the plurality of flow blocking sheets are evenly spaced along the circumferential direction, so that the formed plurality of gaps are evenly spaced along the circumferential direction. And because each flow blocking sheet corresponds to each flow diversion port one by one, the effect of the ink liquid being diverted when reaching each ink supply port 21 is the same, and the flow diversion effect is more uniform. The plurality of flow blocking sheets are all arranged between the ink supply port 21 and the plurality of flow diversion ports 22, so that the diverted ink liquid cannot directly flow from the ink supply port 21 to the flow diversion port 22 in a straight line, so that the flow blocking assembly 3 plays the role of buffering and diverting the ink liquid.

[0038] In other embodiments, the shape of the flow blocking sheet can be other. In this embodiment, the concave surface of the arc-shaped flow blocking sheet faces the ink supply port 21, or the convex surface of the flow blocking sheet can be oriented towards the ink supply port 21 direction. The convex arc surface of the flow blocking sheet is used to buffer and guide the ink liquid, reducing the impact force between the ink liquid and the flow blocking plate, making the buffering effect more stable, or the flow blocking sheet can be in a straight plate form, or distributed in a spiral form, which will not be elaborated here too much.

[0039] In some embodiments, a plurality of baffle plates are grouped together. Each group of baffle plates is annularly distributed centered around the hole center of the ink supply port 21 to form multiple layers of annular enclosures with different diameters. The gaps between the enclosures with different diameters are offset from each other in the diameter direction of the ink supply port 21. The number of baffle plates in the inner ring is less than that in the outer ring. The gaps between two adjacent baffle plates in the inner ring correspond to the baffle plates in the outer ring in the radial direction. After the ink is buffered and split by the baffle plates in the inner ring, it contacts the baffle plates in the outer ring again to achieve multiple buffering and splitting. The number of baffle plates in the outer ring corresponds to the number of the split ports 22. The gap between two adjacent baffle plates in the outer ring corresponds to the middle area between two adjacent split ports 22. That is, after the ink flows out between the baffle plates in the outer ring, it flows to the area between two adjacent split ports 22. After the ink enters the area enclosed by the baffle plates in the inner ring, it is first buffered by the baffle plates in the inner ring, then contacts the baffle plates in the outer ring, and after being buffered and split by the baffle plates in the outer ring, it flows to the area between two adjacent split ports 22 and then is split and flows to two adjacent split ports 22, further improving the buffering and splitting effect on the ink.

[0040] In other embodiments, according to the actual situation, such as different ink supply amounts of the ink and the size of the accommodating cavity 2, the number of groups of baffle plates can be more to achieve a better buffering and splitting effect. In some cases, the gaps between two adjacent baffle plates in the outermost enclosure can be set to correspond to each split port 22 respectively, so that the ink after buffering and splitting directly flows out through the split port 22, making the entire ink flow path smoother.

[0041] During printing with the ink distribution device provided by the embodiments of the present application, the ink enters the accommodating cavity 2 from the ink supply port 21 of the ink distribution device for temporary storage. After the ink enters the accommodating cavity 2, it first enters the area enclosed by the baffle assembly 3. After being buffered and split by the baffle assembly 3, it flows to each split port 22 evenly spaced in the circumferential direction. Since the paths from the ink supply port 21 to each split port 22 are the same, under the same ink supply pressure, the ink can be evenly dispersed to each split port 22 and then transported to each nozzle through the split port 22, thus ensuring that the inkjet rates of each nozzle are the same and improving the inkjet printing effect to a certain extent.

[0042] Embodiment 2: The embodiment of the present application provides an ink path circulation system, which includes at least two cooperating ink distribution devices provided in Embodiment 1. Among them, at least one ink distribution device is a supply ink splitting device, and at least one ink distribution device is a return ink splitting device. Wherein, the supply ink port 21 of the supply ink splitting device is connected to the supply end of the external ink supply component, and multiple splitting ports 22 are connected to the supply ends of external ink-using components; multiple splitting ports 22 of the return ink splitting device are connected to the return ends of external ink-using components, and the supply ink port 21 is connected to the return end of the external ink supply component. The splitting ports 22 of the supply ink splitting device correspond one-to-one to the splitting ports 22 of the return ink splitting device. After the ink is split by the supply ink splitting device, it flows back through the splitting ports 22 of the return ink splitting device to complete the ink circulation.

[0043] Embodiment 3: The embodiment of the present application provides a printing device. In this embodiment, the printing device can be a UV printing device for battery blue film, including an external ink supply component and an external ink-using component, and also includes the ink distribution device of Embodiment 1 or the ink path circulation system of Embodiment 2.

[0044] Embodiment 4: The present application provides a printing production line, which includes a printing device provided in Embodiment 3.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

Claims

1. An ink distribution device, characterized in that, It includes a housing (1) and a flow-blocking component (3); a receiving cavity (2) is formed inside the housing (1), an ink supply port (21) communicating with the receiving cavity (2) is provided on the housing (1), and a plurality of flow-dividing ports (22) communicating with the receiving cavity (2) are formed at the bottom of the housing (1); the flow-blocking component (3) is located on the bottom wall of the receiving cavity (2), and each of the flow-dividing ports (22) surrounds the flow-blocking component (3), and the flow-blocking component (3) is used to block the flow-divided ink liquid flowing from the ink supply port (21) to each of the flow-dividing ports (22) so that the flow paths of the flow-divided ink liquids are of the same distance.

2. The ink distribution device according to claim 1, characterized in that, The cross-section of the receiving cavity (2) is a centrally symmetric figure.

3. The ink distribution device according to claim 1, characterized in that, The plurality of flow-dividing ports (22) are arranged at equal intervals with the axis of the ink supply port (21) as the center.

4. The ink distribution device according to claim 1, characterized in that The flow-blocking component (3) includes a plurality of flow-blocking sheets, each flow-blocking sheet is arranged in one-to-one correspondence with each flow-dividing port, and each of the flow-blocking sheets is arranged at the corresponding flow-dividing port (22).

5. The ink dispensing device according to claim 4, wherein, Taking the plurality of flow-blocking sheets as a group, each group of flow-blocking sheets is annularly distributed with the center of the hole of the ink supply port (21) as the center to form multiple layers of annular enclosures with different diameters, and the gaps of the enclosures with different diameters are arranged in a staggered manner in the diameter direction of the ink supply port (21).

6. The ink distribution device according to claim 1, characterized in that, An air hole (4) is formed at the top of the housing (1), the air hole (4) is communicated with the receiving cavity (2), and a liquid-blocking exhaust valve (41) is arranged in the air hole (4).

7. An ink path circulation system, characterized in that, It includes at least two mutually cooperating ink-dividing devices as described in any one of claims 1-6, wherein at least one of the ink-dividing devices is an ink supply and flow-dividing device, and at least one ink-dividing device is a return ink and flow-dividing device, wherein: The ink supply port (21) of the ink supply and flow-dividing device is connected to the ink supply end of an external ink supply component, and the plurality of flow-dividing ports (22) are connected to the ink supply end of an external ink-using component; The plurality of flow-dividing ports (22) of the return ink and flow-dividing device are connected to the return ink end of the external ink-using component, and the ink supply port (21) is connected to the return ink end of the external ink supply component.

8. A printing device, characterized in that, It includes an external ink supply component and an external ink-using component, and also includes an ink-dividing device as described in any one of claims 1-6.

9. A printing production line, characterized in that, It includes the printing device as described in claim 8.

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