Ink system and printer

Abstract

The present application belongs to the field of printing equipment, and specifically provides an ink circuit system and a printer, wherein the ink circuit system includes a nozzle connection module, an ink inlet module and an ink return module, wherein the nozzle connection module is used to connect to the printing nozzle, and the nozzle connection module includes an ink inlet tube and an ink return tube; the ink inlet module is connected to the ink inlet tube, and the ink inlet module can form a preset positive pressure in the inner cavity of the ink inlet tube; the ink return module is connected to the ink return tube, and the ink return module can form a preset negative pressure in the inner cavity of the ink return tube, and the preset positive pressure and the preset negative pressure can drive the ink to pass through the printing nozzle at a preset speed. By forming positive and negative pressures at both ends of the printing nozzle, the pressure difference at both ends of the printing nozzle is large, and then the ink driving force entering the printing nozzle is large, thereby reducing the risk of ink breakage and line breakage during printing.

Description

Technical Field

[0001] The present application belongs to the technical field of printing equipment, and more specifically, to an ink path system and a printer. Background Art

[0002] The print head and ink circuit system are important components of the printer, among which the ink circuit system is the ink supply and control system. The design of the ink circuit system will directly affect the printing quality and ink leakage risk of the print head. Some existing ink circuit systems are designed by setting double negative pressure structures at both ends of the print head, and using the small pressure difference formed by the negative pressure structures at both ends to drive the ink through the print head to achieve ink supply. The ink circuit system of this design has a small ink delivery driving force and there is a certain risk of ink interruption. Summary of the invention

[0003] The purpose of the present application is to provide an ink path system and a printer to solve the technical problems existing in the prior art that the ink driving force in the printing nozzle is small and there is a risk of ink interruption.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] In one aspect, an ink circuit system is provided, the ink circuit system comprising:

[0006] A nozzle connection module, the nozzle connection module is used to connect with the printing nozzle, and the nozzle connection module includes an ink inlet pipe and an ink return pipe;

[0007] An ink inlet module, the ink inlet module is connected to the ink inlet tube, and the ink inlet module can form a preset positive pressure in the inner cavity of the ink inlet tube;

[0008] An ink return module is connected to the ink return tube, and the ink return module can form a preset negative pressure in the inner cavity of the ink return tube, and the preset positive pressure and the preset negative pressure can drive the ink to pass through the print head at a preset speed.

[0009] Specifically, the inner cavity of the ink inlet tube connected to the print nozzle is configured to the preset positive pressure through the ink inlet module, and the inner cavity of the ink return tube connected to the print nozzle is configured to the preset negative pressure through the ink return module, so that the preset positive pressure and the preset negative pressure are formed at both ends of the print nozzle respectively. This positive and negative pressure design enables a large pressure difference to be formed at both ends of the print nozzle, thereby enabling ink to pass through the print nozzle at the preset speed. On the one hand, during the printing process, the print nozzle has a sufficient amount of ink, reducing the risk of ink and line interruption during the printing process of the print nozzle, thereby improving the ink supply stability of the printing process; on the other hand, the print nozzle The pressure difference between the two ends of the head is large, so that the preset speed is a higher speed. The ink leaves the ink inlet module and enters the ink return module at the preset speed, which can cause a certain disturbance in the ink in the ink inlet module and the ink return module, thereby achieving a stirring effect, so that the interior of the ink inlet module and the ink return module does not need to be provided with a stirring structure, so that the overall cost of the ink path system is lower; on the other hand, during the standby process, the ink passes through the print head at the preset speed, so that the inkjet hole of the print head has a negative pressure, so that the ink in the inkjet hole can be suspended in the inkjet hole without dripping outward, thereby reducing the risk of ink leakage of the print head during the standby process.

[0010] As an embodiment, the ink inlet module delivers ink to the ink inlet tube at a first ink delivery speed so that the inner cavity of the ink inlet tube forms the preset positive pressure; the ink return module draws ink from the ink return tube at a second ink delivery speed so that the inner cavity of the ink return tube forms the preset negative pressure, and the first ink delivery speed is greater than the second ink delivery speed.

[0011] Specifically, by setting the first ink delivery speed to be greater than the second ink delivery speed, a larger positive and negative pressure difference can be formed at both ends of the print head, so that the pressure difference at both ends of the print head is large enough, so that the ink flow speed in the print head can reach the preset speed, thereby effectively reducing the risk of ink leakage of the print head.

[0012] As an embodiment, the ink inlet module includes a first ink cartridge and a first ink pump, one end of the first ink pump is connected to the first ink cartridge, the other end of the first ink pump is connected to the ink inlet tube, and the first ink pump is used to drive ink to flow into the ink inlet tube at the first ink delivery speed; the ink return module includes a second ink cartridge and a second ink pump, one end of the second ink pump is connected to the second ink cartridge, the other end of the second ink pump is connected to the ink return tube, and the second ink pump is used to drive ink to flow away from the ink return tube at the second ink delivery speed.

[0013] Specifically, by arranging the first ink pump and the second ink pump at both ends of the print head, firstly, a pressure difference can be formed at both ends of the print head, thereby driving the ink to flow in the print head, and positive and negative pressures can be formed at both ends of the print head, thereby making the pressure difference at both ends of the print head large enough so that the ink flow speed in the print head can reach the preset speed, thereby effectively reducing the risk of ink leakage of the print head. Secondly, by controlling the ink delivery speed of the two ink pumps to form positive and negative pressures at both ends of the print head, the control logic is simple and the control response is fast.

[0014] As an implementation manner, the first ink delivery speed is 1.01 to 2 times the second ink delivery speed.

[0015] Specifically, the difference between the first ink delivery speed and the second ink delivery speed is controlled to be less than 2 times, so that the ink supply module and the ink return module can use pumps of the same specifications, which helps to reduce the production cost and difficulty of the ink circuit system.

[0016] As an embodiment, the ink inlet module includes a first ink cartridge and a first pressure control subsystem connected to the first ink cartridge, the first ink cartridge is connected to the ink inlet tube, and the first pressure control subsystem is used to enable the first ink cartridge to deliver ink to the ink inlet tube at the first ink delivery speed; the ink return module includes a second ink cartridge and a second pressure control subsystem connected to the second ink cartridge, the second ink cartridge is connected to the ink return tube, and the second pressure control subsystem is used to enable the second ink cartridge to extract ink from the ink return tube at the second ink delivery speed.

[0017] Specifically, by setting the first pressure control subsystem connected to the first ink cartridge and the second pressure control subsystem connected to the second ink cartridge, the pressure of the first ink cartridge and the second ink cartridge can be controlled respectively, thereby realizing the pressure control of the ink inlet pipe and the ink return pipe, so that the first ink cartridge delivers ink to the ink inlet pipe at the first ink delivery speed and the second ink cartridge extracts ink from the ink return pipe at the second ink delivery speed, thereby making the pressure of the ink inlet pipe at the preset positive pressure and the pressure of the ink return pipe at the preset negative pressure. This method of indirectly controlling the pressure of the ink inlet pipe and the ink return pipe by controlling the pressure of the first ink cartridge and the second ink cartridge and then controlling the ink delivery speed of the ink inlet pipe and the ink return pipe can make the pressure of the ink inlet pipe and the ink return pipe more stable and the pressure change more gentle, which is more conducive to the stability of the pressure of the ink jet hole position inside the print head.

[0018] As an embodiment, the first pressure control subsystem includes a positive pressure regulating component and a positive pressure generating component, the positive pressure regulating component is connected to the first ink cartridge, the positive pressure regulating component can adjust the pressure of the first ink cartridge so that the inner cavity of the ink inlet tube forms the preset positive pressure, the positive pressure generating component is connected to the positive pressure regulating component, and the positive pressure generating component is used to generate positive pressure and provide positive pressure to the positive pressure regulating component.

[0019] Specifically, the combined design of the positive pressure regulating component for storing positive pressure and the positive pressure generating component for preparing positive pressure is adopted to realize the generation and temporary storage of positive pressure, so that the positive pressure regulating component connected to the first ink cartridge reserves sufficient positive pressure. Therefore, on the one hand, the pressure in the first ink cartridge and the ink inlet tube can be made more stable, which is beneficial for maintaining the inner cavity of the ink inlet tube at the preset positive pressure. On the other hand, the regulation efficiency of the positive pressure fluctuation of the first ink cartridge and the ink inlet tube can be improved, which helps to improve the working stability of the print head.

[0020] As an embodiment, the second pressure control subsystem includes a negative pressure regulating component and a negative pressure generating component. The negative pressure regulating component is connected to the second ink cartridge, and the negative pressure regulating component can adjust the pressure of the second ink cartridge so that the inner cavity of the ink return tube forms the preset negative pressure. The negative pressure generating component is connected to the negative pressure regulating component, and the negative pressure generating component is used to generate negative pressure and provide negative pressure to the negative pressure regulating component.

[0021] Specifically, the combined design of the negative pressure regulating component for storing negative pressure and the negative pressure generating component for preparing negative pressure is adopted to realize the generation and temporary storage of negative pressure, so that the negative pressure regulating component connected to the second ink cartridge reserves sufficient negative pressure. Therefore, on the one hand, the pressure in the second ink cartridge and the ink return tube can be made more stable, which is beneficial for maintaining the inner cavity of the ink return tube at the preset negative pressure. On the other hand, the regulation efficiency of the negative pressure fluctuation of the second ink cartridge and the ink return tube can be improved, which helps to assist in improving the working stability of the print head.

[0022] As an embodiment, the ink path system also includes a circulation module, one end of which is connected to the ink inlet module, and the other end of which is connected to the ink return module. The circulation module can drive ink to be transferred from the ink return module to the ink inlet module.

[0023] Specifically, by setting the circulation module, a closed-loop connection between the ink inlet module and the ink return module can be achieved, so that the ink inside the ink path system can continue to circulate. On the one hand, it is convenient to control the ink state inside the ink path system, such as facilitating the control of the ink temperature; on the other hand, the ink in the ink inlet module and the ink return module continues to generate a certain disturbance, thereby achieving a stirring effect, so that the interior of the ink inlet module and the ink return module does not need to be equipped with a stirring structure, thereby reducing the overall cost of the ink path system.

[0024] As an implementation manner, the ink path system further includes an ink supply module, the ink supply module is connected to the ink return module, and the ink supply module is used to provide ink to the ink return module.

[0025] Specifically, by connecting the ink supply module with the ink return module configured to the preset negative pressure state, and replenishing ink into the ink return module, on the one hand, since the ink return module is in a negative pressure state, the resistance to ink entering the ink return module is smaller, which is more conducive to the ink supply module to transport ink into the ink return module, thereby improving the efficiency of the ink supply module in transporting ink; on the other hand, the ink return module is connected to the ink return tube, that is, the ink return module is connected to the ink return port of the print head rather than the ink inlet port. This design is more conducive to reducing the pressure impact of the ink replenishing action on the inkjet hole position of the print head, so that the pressure stability of the ink inside the print head is higher, thereby helping to improve the printing quality of the print head.

[0026] As an embodiment, the circulation module includes a circulation ink tube, and a circulation pump and a heat exchange component arranged on the circulation ink tube, one end of the circulation ink tube is connected to the ink inlet module, and the other end of the circulation ink tube is connected to the ink return module, the circulation pump is used to drive the ink to transfer from the ink return module to the ink inlet module, and the heat exchange component is used to regulate the temperature of the ink.

[0027] Specifically, by providing the heat exchange component, the temperature of the ink can be adjusted, thereby helping to reduce the risk of clogging of the print head and assisting the print head in temperature control to avoid overheating of the print head or overheating and deterioration of the ink.

[0028] As an embodiment, the heat exchange component includes a water-cooled heat exchanger and a heating structure, the water-cooled heat exchanger includes a heat exchange body, and a water pipe and an ink pipe arranged in the heat exchange body, the water pipe is used to connect to an external water cooling system, the ink pipe is connected to the circulating ink tube, and both the water pipe and the ink pipe can exchange heat with the heat exchange body; the heating structure is arranged in the heat exchange body and can exchange heat with the heat exchange body.

[0029] Specifically, on the one hand, by setting the water-cooled heat exchanger to cool the ink and setting the heating structure to heat the ink, the temperature of the ink can be raised and lowered, so that the ink is in an optimal temperature range, which is beneficial for the ink to maintain effective performance and improve the working stability of the print head. On the other hand, setting the water-cooled heat exchanger and the heating structure as a whole and using the same heat exchange body to exchange heat with the ink helps to simplify the overall structure of the heat exchange component and improve the structural compactness of the heat exchange component, which helps to miniaturize the ink path system as a whole. In the specific implementation process, the heat exchange body can be made of a heat-conducting metal.

[0030] As an embodiment, the heat exchange component also includes a temperature sensor, which is arranged in the ink inlet module and can detect the temperature of the ink in the ink inlet module. The temperature sensor is electrically connected to the heating structure and the water-cooled heat exchanger.

[0031] Specifically, by arranging the temperature sensor in the ink inlet module and electrically connecting the temperature sensor to the heating structure and the water-cooled heat exchanger, closed-loop control of the ink temperature rise and fall can be achieved, thereby achieving a dynamic balance of the ink temperature and improving the reliability of the ink temperature control.

[0032] As an embodiment, the ink path system further includes a degassing module, the degassing module is connected to the circulation module, and the degassing module can remove bubbles from the ink in the circulation module.

[0033] Specifically, by arranging the degassing module on the circulation module, the ink about to enter the ink inlet module can be debubbled to reduce the bubble content in the ink, thereby improving the working stability of the print head.

[0034] On the other hand, a printer is provided, comprising a print head and any one of the above-mentioned ink circuit systems, wherein the print head is connected to the ink circuit system.

[0035] The beneficial effects of the ink path system and printer provided by the present application are:

[0036] The inner cavity of the ink inlet tube connected to the print head is configured to the preset positive pressure through the ink inlet module, and the inner cavity of the ink return tube connected to the print head is configured to the preset negative pressure through the ink return module, so that the preset positive pressure and the preset negative pressure are formed at both ends of the print head respectively. This positive and negative pressure design enables a large pressure difference to be formed at both ends of the print head, thereby enabling ink to pass through the print head at the preset speed. On the one hand, during the printing process, the print head has a sufficient amount of ink, reducing the risk of ink and line interruption during the printing process of the print head, thereby improving the ink supply stability during the printing process; on the other hand, the print head The pressure difference between the two ends is large, so that the preset speed is a higher speed. The ink leaves the ink inlet module and enters the ink return module at the preset speed, which can cause a certain disturbance in the ink in the ink inlet module and the ink return module, thereby achieving a stirring effect, so that the interior of the ink inlet module and the ink return module does not need to be equipped with a stirring structure, so that the overall cost of the ink path system is lower; on the other hand, during the standby process, the ink passes through the print head at the preset speed, so that the inkjet hole of the print head has a negative pressure, so that the ink in the inkjet hole can be suspended in the inkjet hole without dripping outward, thereby reducing the risk of ink leakage of the print head during the standby process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 A schematic diagram of an ink path system provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of a first implementation of the ink path system provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of a second implementation of the ink path system provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of a black-entry module provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of a black return module provided in an embodiment of the present application;

[0043] Figure 6 Schematic diagram of the circulation module and degassing module provided in an embodiment of the present application.

[0044] Among them, the reference numerals in the figure are:

[0045] 1. Nozzle connection module; 11. Ink inlet pipe; 12. Ink return pipe; 13. First anti-drip ink valve; 14. Second anti-drip ink valve;

[0046] 2. Ink inlet module; 21. First ink cartridge; 22. First ink delivery pump; 23. First pressure control subsystem; 231. Positive pressure regulating assembly; 2311. Positive pressure box; 2312. Positive pressure gauge; 232. Positive pressure generating assembly; 2321. Positive pressure pump; 2322. Positive pressure gas storage tank; 2323. First pressure sensor; 2324. First pressure relief valve; 2325. First control valve; 2326. First precision pressure regulating valve; 233. Three-way valve; 24. First liquid level sensor;

[0047] 3. Ink return module; 31. Second ink cartridge; 32. Second ink delivery pump; 33. Second pressure control subsystem; 331. Negative pressure regulating assembly; 3311. Negative pressure box; 3312. Negative pressure gauge; 332. Negative pressure generating assembly; 3321. Vacuum generator; 3322. Negative pressure gas storage tank; 3323. Second pressure sensor; 3324. Second pressure relief valve; 3325. Second control valve; 3326. Second precision pressure regulating valve; 34. Second liquid level sensor;

[0048] 4. Circulation module; 41. Circulation ink tube; 42. Circulation pump; 43. Heat exchange assembly; 431. Water-cooled heat exchanger; 4311. Heat exchange body; 4312. First heat exchange inlet; 4313. First heat exchange outlet; 4314. Second heat exchange inlet; 4315. Second heat exchange outlet; 432. Heating structure; 433. Temperature sensor; 434. Temperature controller; 435. Overheat protector; 44. Second filter; 45. Second backflow prevention valve;

[0049] 5. ink supply module; 51. ink supply barrel; 52. ink supply tube; 53. ink supply pump; 54. ink supply one-way valve; 55. ink supply level sensor; 56. first filter; 57. first anti-backflow valve;

[0050] 6. Degassing module; 61. Degassing reaction box; 62. Degassing pressure regulating component; 63. Degassing pressure generating component;

[0051] 100, print head; 101, ink distribution tube; 102, ink inlet; 103, ink return port. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0054] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] The present application embodiment provides an ink path system, such as Figure 1 As shown, the ink path system includes a nozzle connection module 1, an ink inlet module 2 and an ink return module 3. The nozzle connection module 1 is used to connect to the printing nozzle 100, and the nozzle connection module 1 includes an ink inlet tube 11 and an ink return tube 12; the ink inlet module 2 is connected to the ink inlet tube 11, and the ink inlet module 2 can form a preset positive pressure in the inner cavity of the ink inlet tube 11; the ink return module 3 is connected to the ink return tube 12, and the ink return module 3 can form a preset negative pressure in the inner cavity of the ink return tube 12, and the preset positive pressure and the preset negative pressure can drive the ink to pass through the printing nozzle 100 at a preset speed.

[0057] The inner cavity of the ink inlet tube 11 connected to the print head 100 is configured to a preset positive pressure through the ink inlet module 2, and the inner cavity of the ink return tube 12 connected to the print head 100 is configured to a preset negative pressure through the ink return module 3, so that the two ends of the print head 100 form a preset positive pressure and a preset negative pressure respectively. This positive and negative pressure design enables a large pressure difference to be formed at the two ends of the print head 100, so that the ink can pass through the print head 100 at a preset speed. On the one hand, during the printing process, the print head 100 has a sufficient amount of ink, which reduces the risk of ink and line interruption during the printing process of the print head 100, and improves the ink supply stability of the printing process; on the other hand, the print head 10 0, the pressure difference at both ends is large, so that the preset speed is a higher speed. The ink leaves the ink inlet module 2 and enters the ink return module 3 at the preset speed, which can cause a certain disturbance in the ink in the ink inlet module 2 and the ink return module 3, thereby achieving a stirring effect, so that the interior of the ink inlet module 2 and the ink return module 3 does not need to be provided with a stirring structure, so that the overall cost of the ink path system is lower; on the other hand, during the standby process, the ink passes through the print head 100 at a preset speed, so that the inkjet hole of the print head 100 has a negative pressure, so that the ink in the inkjet hole can be suspended in the inkjet hole without dripping outward, thereby reducing the risk of ink leakage of the print head 100 during the standby process. It should be noted that the two ends of the existing print nozzle 100 are configured with a double negative pressure design. Although it can make the ink suspend in the inkjet hole, thereby reducing the risk of ink leakage of the print nozzle 100, this double negative pressure design directly uses the negative pressure at both ends to lift and suspend the ink. The pressure value at the inkjet hole position has a pressure change process during the process of switching from the printing state to the standby state. During this change process, the inkjet hole still has the risk of ink leakage; the positive and negative pressure design of the present application uses the ink to flow in the print nozzle 100 at a preset speed, thereby forming a negative pressure at the inkjet hole position, and the negative pressure is generated by the fluid movement. That is to say, the principle of forming negative pressure at the inkjet hole position is different from the existing design, and the speed of the ink in the print nozzle 100 during the process of switching from the printing state to the standby state can be stabilized at the preset speed, so that this difference in principle makes the pressure state of the inkjet hole during the process of switching from the printing state to the standby state relatively stable. Therefore, the positive and negative pressure design of the present application can more reliably reduce the risk of ink leakage of the print nozzle 100.

[0058] Specifically, first, the direction of the preset speed is that the ink flows from the end of the print head 100 connected to the ink inlet tube 11 to the end connected to the ink return tube 12. The preset speed is calculated based on the specific ink tube structure of the print head 100, the shape and size of the ink jet hole, and the specifications of the ink. Different print heads 100 and inks require different preset speeds. This application emphasizes the logical relationship that the ink passes through the print head 100 at the preset speed, which can form a negative pressure at the ink jet hole, and does not limit the specific value of the preset speed. Therefore, this application does not need to further limit the value of the preset speed. Second, the preset positive pressure and the preset negative pressure are a set of pressure values ​​that enable the ink to pass through the print head 100 at the preset speed. Since the preset speed is variable, the pressure difference at both ends of the print head 100 is also variable, that is, the preset positive pressure and the preset negative pressure vary based on the specific ink tube structure of the print head 100, the shape and size of the ink jet hole, and the specifications of the ink. This application only emphasizes the logical relationship between the preset positive pressure and the preset negative pressure and the preset speed. Therefore, this application does not need to limit the specific values ​​of the preset positive pressure and the preset negative pressure.

[0059] In one embodiment, if Figure 2 and Figure 3 As shown, the nozzle connection module 1 also includes a first anti-ink dripping valve 13 and a second anti-ink dripping valve 14, the first anti-ink dripping valve 13 is arranged on the ink inlet pipe 11, and the second anti-ink dripping valve 14 is arranged on the ink return pipe 12. In an abnormal situation or when the print nozzle 100 is replaced, the ink inlet module 2 and the ink return module 3 can be disconnected from the print nozzle 100 by closing the first anti-ink dripping valve 13 and the second anti-ink dripping valve 14, respectively, thereby effectively preventing the ink of the ink inlet module 2 and the ink return module 3 from entering the print nozzle 100. Further, the first anti-ink dripping valve 13 and the second anti-ink dripping valve 14 are both two-way valves.

[0060] In one embodiment, if Figure 2 and Figure 3 As shown, the print head 100 includes an ink distribution tube 101 and an inkjet hole connected to the ink distribution tube 101, the ink distribution tube 101 includes an ink inlet 102 and an ink return port 103 that are exposed to the outside, the ink inlet tube 11 is connected to the ink inlet 102, and the ink return tube 12 is connected to the ink return port 103. Of course, in other embodiments, it can also be designed as follows: the print head 100 is provided with an inkjet hole, the nozzle connection module 1 also includes an intermediate ink tube, the two ends of the intermediate ink tube are respectively connected to the ink inlet tube 11 and the ink return tube 12, the intermediate ink tube is embedded in the print head 100, and is connected to the inkjet hole.

[0061] In one embodiment, the ink inlet module 2 delivers ink to the ink inlet tube 11 at a first ink delivery speed, so that the inner cavity of the ink inlet tube 11 forms a preset positive pressure; the ink return module 3 extracts ink from the ink return tube 12 at a second ink delivery speed, so that the inner cavity of the ink return tube 12 forms a preset negative pressure, and the first ink delivery speed is greater than the second ink delivery speed. By setting the first ink delivery speed to be greater than the second ink delivery speed, a larger positive and negative pressure difference can be formed at both ends of the print nozzle 100, and then the pressure difference at both ends of the print nozzle 100 is large enough, so that the ink flow speed in the print nozzle 100 can reach a preset speed, thereby effectively reducing the risk of ink leakage of the print nozzle 100. Furthermore, the specific ink tube structure, inkjet hole shape and size, and ink specifications of the print nozzle 100 are different, and the speed difference requirements between the first ink delivery speed and the second ink delivery speed are different.

[0062] In one embodiment, if Figure 2 As shown, the ink inlet module 2 includes a first ink cartridge 21 and a first ink pump 22, one end of the first ink pump 22 is connected to the first ink cartridge 21, the other end of the first ink pump 22 is connected to the ink inlet tube 11, and the first ink pump 22 is used to drive the ink to flow into the ink inlet tube 11 at a first ink delivery speed; the ink return module 3 includes a second ink cartridge 31 and a second ink pump 32, one end of the second ink pump 32 is connected to the second ink cartridge 31, the other end of the second ink pump 32 is connected to the ink return tube 12, and the second ink pump 32 is used to drive the ink to flow away from the ink return tube 12 at a second ink delivery speed.

[0063] By arranging the first ink delivery pump 22 and the second ink delivery pump 32 at both ends of the print head 100, firstly, a pressure difference can be formed at both ends of the print head 100, thereby driving the ink to flow in the print head 100, and positive and negative pressures can be formed at both ends of the print head 100, thereby making the pressure difference at both ends of the print head 100 large enough, so that the ink flow speed in the print head 100 can reach a preset speed, thereby effectively reducing the risk of ink leakage of the print head 100. Secondly, by controlling the ink delivery speed of the two ink delivery pumps to form positive and negative pressures at both ends of the print head 100, the control logic is simple and the control response is fast.

[0064] In the specific implementation process, the first ink pump 22 is connected to the bottom of the first ink cartridge 21, and the second ink pump 32 is connected to the bottom of the second ink cartridge 31. Both ends of the circulation module 4 are connected to the bottom of the first ink cartridge 21 and the second ink cartridge 31 respectively.

[0065] In one embodiment, the first ink pump 22 and the second ink pump 32 are both piezoelectric pumps. Of course, in other embodiments, the first ink pump 22 and the second ink pump 32 may also be other types of pumps.

[0066] In one embodiment, the first ink delivery speed is 1.01 to 2 times the second ink delivery speed. Specifically, the difference between the first ink delivery speed and the second ink delivery speed is controlled to be less than 2 times, so that the ink inlet module 2 and the ink return module 3 can use pumps of the same specifications, thereby helping to reduce the production cost and difficulty of the ink circuit system.

[0067] In a specific implementation, the first ink delivery speed may be 1.01 times or 1.03 times or 1.05 times or 1.07 times or 1.09 times or 1.1 times or 1.2 times or 1.3 times or 1.4 times or 1.5 times or 1.6 times or 1.7 times or 1.8 times or 1.9 times or 2 times the second ink delivery speed.

[0068] In one embodiment, if Figure 3 and Figure 4 As shown, the ink inlet module 2 includes a first ink cartridge 21 and a first pressure control subsystem 23 connected to the first ink cartridge 21, the first ink cartridge 21 is connected to the ink inlet tube 11, and the first pressure control subsystem 23 is used to enable the first ink cartridge 21 to deliver ink to the ink inlet tube 11 at a first ink delivery speed; the ink return module 3 includes a second ink cartridge 31 and a second pressure control subsystem 33 connected to the second ink cartridge 31, the second ink cartridge 31 is connected to the ink return tube 12, and the second pressure control subsystem 33 is used to enable the second ink cartridge 31 to extract ink from the ink return tube 12 at a second ink delivery speed.

[0069] By providing a first pressure control subsystem 23 connected to the first ink cartridge 21 and a second pressure control subsystem 33 connected to the second ink cartridge 31, the pressures of the first ink cartridge 21 and the second ink cartridge 31 can be controlled respectively, thereby realizing pressure control of the ink inlet tube 11 and the ink return tube 12, so that the first ink cartridge 21 delivers ink to the ink inlet tube 11 at a first ink delivery speed and the second ink cartridge 31 extracts ink from the ink return tube 12 at a second ink delivery speed, thereby making the pressure of the ink inlet tube 11 at a preset positive pressure and the pressure of the ink return tube 12 at a preset negative pressure. This method of indirectly controlling the pressures of the ink inlet tube 11 and the ink return tube 12 by controlling the pressures of the first ink cartridge 21 and the second ink cartridge 31 and thereby controlling the ink delivery speeds of the ink inlet tube 11 and the ink return tube 12 can make the pressures of the ink inlet tube 11 and the ink return tube 12 more stable and the pressure changes more gently, which is more conducive to the stability of the pressure at the inkjet hole position inside the print head 100.

[0070] In one embodiment, if Figure 3 and Figure 4As shown, the first pressure control subsystem 23 includes a positive pressure regulating component 231 and a positive pressure generating component 232. The positive pressure regulating component 231 is connected to the first ink cartridge 21. The positive pressure regulating component 231 can adjust the pressure of the first ink cartridge 21 so that a preset positive pressure is formed in the inner cavity of the ink inlet tube 11. The positive pressure generating component 232 is connected to the positive pressure regulating component 231. The positive pressure generating component 232 is used to generate positive pressure and provide positive pressure to the positive pressure regulating component 231.

[0071] The combined design of the positive pressure regulating component 231 for storing positive pressure and the positive pressure generating component 232 for preparing positive pressure can realize the generation and temporary storage of positive pressure, so that the positive pressure regulating component 231 connected to the first ink cartridge 21 can store sufficient positive pressure. On the one hand, it can make the pressure in the first ink cartridge 21 and the ink inlet tube 11 more stable, which is beneficial for maintaining the inner cavity of the ink inlet tube 11 at a preset positive pressure. On the other hand, it can improve the regulation efficiency of the positive pressure fluctuation of the first ink cartridge 21 and the ink inlet tube 11, which helps to improve the working stability of the print head 100.

[0072] In one embodiment, if Figure 3 and Figure 4 As shown, the positive pressure regulating component 231 includes a positive pressure box 2311 and a positive pressure gauge 2312. The positive pressure box 2311 is connected to the first ink cartridge 21. The positive pressure box 2311 is used to reserve positive pressure. The positive pressure gauge 2312 is connected to the positive pressure box 2311. The positive pressure gauge 2312 is used to detect the positive pressure state in the positive pressure box 2311. When the positive pressure gauge 2312 determines that the pressure value of the positive pressure of the positive pressure box 2311 is lower than the lower limit value, the positive pressure generating component 232 starts the pressurizing operation and increases the positive pressure value of the positive pressure box 2311; when the positive pressure gauge 2312 determines that the pressure value of the positive pressure of the positive pressure box 2311 reaches the upper limit value, the positive pressure generating component 232 stops the pressurizing operation.

[0073] In one embodiment, if Figure 3 and Figure 4As shown, the positive pressure generating assembly 232 includes a positive pressure pump 2321, a positive pressure gas tank 2322, a first pressure sensor 2323, a first pressure relief valve 2324 and a first control valve 2325. The positive pressure gas tank 2322 is connected to the positive pressure box 2311. The positive pressure pump 2321 is selectively connected to the positive pressure gas tank 2322 and the positive pressure box 2311 to provide positive pressure to the positive pressure gas tank 2322 and the positive pressure box 2311. The positive pressure gas storage tank 2322 is provided with a first pressure sensor 2323 and a first pressure relief valve 2324. The first pressure sensor 2323 is used to detect the positive pressure value in the positive pressure gas storage tank 2322. When the first pressure sensor 2323 determines that the pressure value in the positive pressure gas storage tank 2322 is too low, the positive pressure pump 2321 is connected with the positive pressure gas storage tank 2322 and the positive pressure box 2311 to increase the positive pressure value in the positive pressure gas storage tank 2322; when the first pressure sensor 2323 determines that the pressure value in the positive pressure gas storage tank 2322 is too high, the first pressure relief valve 2324 is opened to reduce the positive pressure value in the positive pressure gas storage tank 2322. In the specific implementation process, the first control valve 2325 is connected to the side of the positive pressure gas tank 2322 away from the positive pressure pump 2321, and the first control valve 2325 is also provided with a first precision pressure regulating valve 2326 on the side away from the positive pressure gas tank 2322. The first control valve 2325 and the first precision pressure regulating valve 2326 cooperate with the positive pressure pump 2321 to control the positive pressure value of the positive pressure gas tank 2322. By setting the first precision pressure regulating valve 2326, the control accuracy of the positive pressure value in the positive pressure gas tank 2322 can be further improved. This solution uses the first pressure sensor 2323, the first pressure relief valve 2324 and the first control valve 2325 with lower costs to replace the electrical proportional valve with higher costs, which can not only achieve similar technical effects, but also reduce the overall cost of the ink circuit system. Of course, in other embodiments, the first pressure sensor 2323, the first pressure relief valve 2324 and the first control valve 2325 can also be replaced by an electrical proportional valve, and this implementation method is simpler and more convenient to assemble.

[0074] In the specific implementation process, Figure 4 As shown, the first pressure control subsystem 23 also includes a three-way valve 233 , and three terminals of the three-way valve 233 are respectively connected to the first ink cartridge 21 , the positive pressure box 2311 and the positive pressure pump 2321 , so that the positive pressure pump 2321 is selectively connected to the positive pressure box 2311 .

[0075] In one embodiment, if Figure 3 and Figure 5As shown, the second pressure control subsystem 33 includes a negative pressure regulating component 331 and a negative pressure generating component 332. The negative pressure regulating component 331 is connected to the second ink cartridge 31. The negative pressure regulating component 331 can adjust the pressure of the second ink cartridge 31 so that a preset negative pressure is formed in the inner cavity of the ink return tube 12. The negative pressure generating component 332 is connected to the negative pressure regulating component 331. The negative pressure generating component 332 is used to generate negative pressure and provide negative pressure to the negative pressure regulating component 331.

[0076] The combined design of the negative pressure regulating component 331 for storing negative pressure and the negative pressure generating component 332 for preparing negative pressure is adopted to realize the generation and temporary storage of negative pressure, so that the negative pressure regulating component 331 connected to the second ink cartridge 31 can store sufficient negative pressure. On the one hand, it can make the pressure in the second ink cartridge 31 and the ink return tube 12 more stable, which is beneficial for maintaining the inner cavity of the ink return tube 12 at a preset negative pressure. On the other hand, it can improve the regulation efficiency of the negative pressure fluctuation of the second ink cartridge 31 and the ink return tube 12, which helps to assist in improving the working stability of the print head 100.

[0077] In one embodiment, if Figure 3 and Figure 5 As shown, the negative pressure regulating component 331 includes a negative pressure box 3311 and a negative pressure gauge 3312. The negative pressure box 3311 is connected to the second ink cartridge 31. The negative pressure box 3311 is used to reserve negative pressure. The negative pressure gauge 3312 is connected to the negative pressure box 3311. The negative pressure gauge 3312 is used to detect the negative pressure state in the negative pressure box 3311. When the negative pressure gauge 3312 determines that the pressure value of the negative pressure of the negative pressure box 3311 is lower than the lower limit value, the negative pressure generating component 332 starts the pressurizing operation and increases the negative pressure value of the negative pressure box 3311; when the negative pressure gauge 3312 determines that the pressure value of the negative pressure of the negative pressure box 3311 reaches the upper limit value, the negative pressure generating component 332 stops the pressurizing operation.

[0078] In one embodiment, if Figure 3 and Figure 5As shown, the negative pressure generating assembly 332 includes a vacuum generator 3321, a negative pressure gas tank 3322, a second pressure sensor 3323, a second pressure relief valve 3324 and a second control valve 3325. The negative pressure gas tank 3322 is connected to the negative pressure box 3311, and the vacuum generator 3321 is connected to the side of the negative pressure gas tank 3322 away from the negative pressure box 3311 so as to provide negative pressure to the negative pressure gas tank 3322 and the negative pressure box 3311. The negative pressure gas storage tank 3322 is provided with a second pressure sensor 3323 and a second pressure relief valve 3324. The second pressure sensor 3323 is used to detect the negative pressure value in the negative pressure gas storage tank 3322. When the second pressure sensor 3323 determines that the pressure value in the negative pressure gas storage tank 3322 is too low, the vacuum generator 3321 starts working to increase the negative pressure value in the negative pressure gas storage tank 3322; when the second pressure sensor 3323 determines that the pressure value in the negative pressure gas storage tank 3322 is too high, the second pressure relief valve 3324 is opened to reduce the negative pressure value in the negative pressure gas storage tank 3322. In the specific implementation process, the second control valve 3325 is arranged between the negative pressure gas tank 3322 and the vacuum generator 3321, and the vacuum generator 3321 is further provided with a second precision pressure regulating valve 3326 on the side away from the negative pressure gas tank 3322. The first control valve 2325 and the second precision pressure regulating valve 3326 cooperate with the vacuum generator 3321 to control the negative pressure value of the negative pressure gas tank 3322. By setting the second precision pressure regulating valve 3326, the control accuracy of the negative pressure value in the negative pressure gas tank 3322 can be further improved. This solution uses the second pressure sensor 3323, the second pressure relief valve 3324 and the second control valve 3325 with lower cost to replace the electrical proportional valve with higher cost, which can not only achieve similar technical effects, but also reduce the overall cost of the ink circuit system. Of course, in other embodiments, the second pressure sensor 3323, the second pressure relief valve 3324 and the second control valve 3325 can also be replaced by an electrical proportional valve, and this implementation method is simpler and more convenient to assemble.

[0079] In one embodiment, if Figure 2 and Figure 3As shown, the ink circuit system also includes a circulation module 4, one end of which is connected to the ink inlet module 2, and the other end is connected to the ink return module 3. The circulation module 4 can drive the ink to transfer from the ink return module 3 to the ink inlet module 2. By setting the circulation module 4, the closed-loop connection between the ink inlet module 2 and the ink return module 3 can be achieved, so that the ink inside the ink circuit system can continue to circulate. On the one hand, it is convenient to control the ink state inside the ink circuit system, such as facilitating the control of the ink temperature; on the other hand, the ink in the ink inlet module 2 and the ink return module 3 continues to produce a certain disturbance, thereby achieving a similar stirring effect, so that the inside of the ink inlet module 2 and the ink return module 3 can be free of the need to set a stirring structure, so that the overall cost of the ink circuit system is lower. In the specific implementation process, one end of the circulation module 4 is connected to the first ink cartridge 21, and the other end is connected to the second ink cartridge 31.

[0080] In one embodiment, if Figure 2 and Figure 3 As shown, the ink circuit system further includes an ink supply module 5, which is connected to the ink return module 3 and is used to provide ink to the ink return module 3. Further, the ink supply module 5 is connected to the second ink cartridge 31 and is used to provide ink to the second ink cartridge 31.

[0081] By connecting the ink supply module 5 to the second ink cartridge 31 configured to a preset negative pressure state and replenishing ink into the second ink cartridge 31, on the one hand, since the second ink cartridge 31 is in a negative pressure state, the resistance to ink entering the second ink cartridge 31 is smaller, which is more conducive to the ink supply module 5 to transport ink into the second ink cartridge 31, thereby improving the efficiency of the ink supply module 5 in transporting ink; on the other hand, the second ink cartridge 31 is connected to the ink return tube 12, that is, the second ink cartridge 31 is connected to the ink return port 103 of the print head 100, rather than the ink inlet port 102. This design is more conducive to reducing the pressure impact of the ink replenishing action on the inkjet hole position of the print head 100, so that the pressure stability of the ink inside the print head 100 is higher, thereby helping to improve the printing quality of the print head 100.

[0082] In one embodiment, if Figure 5 As shown, a second liquid level sensor 34 is provided in the second ink cartridge 31, and the second liquid level sensor 34 is used to detect the liquid level of the ink in the second ink cartridge 31. When the second liquid level sensor 34 detects that the liquid level of the ink in the second ink cartridge 31 reaches the lower limit value, the controller controls the ink supply module 5 to deliver ink to the second ink cartridge 31, so that the liquid level of the ink in the second ink cartridge 31 rises; when the second liquid level sensor 34 detects that the liquid level of the ink in the second ink cartridge 31 reaches the upper limit value, the controller controls the ink supply module 5 to stop delivering ink to the second ink cartridge 31, so that the liquid level of the ink in the second ink cartridge 31 is continuously between the lower limit value and the upper limit value, thereby maintaining the stable operation of the print head 100.

[0083] In the specific implementation process, the second liquid level sensor 34 is a float liquid level sensor. Since the second liquid level sensor 34 is arranged in the second ink cartridge 31, and the second ink cartridge 31 is connected to the ink return port 103 of the print head 100, the second ink cartridge 31 is used to replenish ink to the first ink cartridge 21, rather than directly providing ink to the print head 100, that is to say, the change in the liquid level height of the ink in the second ink cartridge 31 has no direct effect on the printing work of the print head 100, therefore, the monitoring requirements for the liquid level height of the ink in the second ink cartridge 31 are not high. This solution sets the second liquid level sensor 34 as a float liquid level sensor, which can not only meet the detection requirements of the liquid level height of the ink, but also reduce costs. Of course, in other embodiments, the second liquid level sensor 34 can also be an analog liquid level sensor with higher accuracy.

[0084] In one embodiment, if Figure 2 and Figure 3 As shown, the ink supply module 5 includes an ink supply barrel 51, an ink supply tube 52, an ink supply pump 53 and an ink supply one-way valve 54. One end of the ink supply tube 52 is connected to the ink supply barrel 51, and the other end of the ink supply tube 52 is connected to the second ink cartridge 31. The ink supply pump 53 and the ink supply one-way valve 54 are both arranged on the ink supply tube 52, and the ink supply one-way valve 54 is arranged on the side of the ink supply pump 53 away from the ink supply barrel 51. The ink supply pump 53 is used to transport the ink in the ink supply barrel 51 to the second ink cartridge 31, and the conduction direction of the ink supply one-way valve 54 is from the ink supply barrel 51 to the second ink cartridge 31. In the specific implementation process, the ink supply tube 52 is connected to the bottom of the second ink cartridge 31. Further, the ink supply pump 53 is a piezoelectric pump. Of course, in other embodiments, the ink supply pump 53 can also be other types of pumps.

[0085] In one embodiment, if Figure 2 and Figure 3 As shown, the ink supply module 5 also includes an ink supply level sensor 55, which is arranged in the ink supply barrel 51. The ink supply level sensor 55 is used to detect the lower limit value of the ink liquid level in the ink supply barrel 51. When the ink supply level sensor 55 is triggered, it means that the ink in the ink supply barrel 51 is lower than the lower limit value. At this time, the ink supply pump 53 stops working and sends a signal to the outside through the controller that ink needs to be replenished to the ink supply barrel 51.

[0086] In one embodiment, if Figure 2 and Figure 3As shown, the ink supply module 5 further includes a first filter 56 and a first anti-backflow valve 57 arranged on the ink supply tube 52, the first filter 56 is located on the side of the ink supply one-way valve 54 away from the ink supply barrel 51, and the first anti-backflow valve 57 is located on the side of the first filter 56 away from the ink supply barrel 51. The first filter 56 is used to filter and preliminarily remove bubbles from the ink that is about to enter the second ink cartridge 31 to improve the cleanliness of the ink in the second ink cartridge 31. In the specific implementation process, an air exhaust port is provided on the first filter 56 to exhaust bubbles in the ink. Further, the first anti-backflow valve 57 is a two-way valve.

[0087] In one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the circulation module 4 includes a circulation ink tube 41, a circulation pump 42 and a heat exchange component 43 arranged on the circulation ink tube 41, one end of the circulation ink tube 41 is connected to the ink inlet module 2, the other end of the circulation ink tube 41 is connected to the ink return module 3, the circulation pump 42 is used to drive the ink to transfer from the ink return module 3 to the ink inlet module 2, and the heat exchange component 43 is used to adjust the temperature of the ink. Further, one end of the circulation ink tube 41 is connected to the first ink cartridge 21, the other end of the circulation ink tube 41 is connected to the second ink cartridge 31, and the circulation pump 42 is used to drive the ink to transfer from the second ink cartridge 31 to the first ink cartridge 21.

[0088] By providing the heat exchange component 43, the temperature of the ink can be adjusted, thereby helping to reduce the risk of clogging of the print head 100 and assisting the print head 100 in temperature control to avoid overheating of the print head 100 or overheating and deterioration of the ink.

[0089] In one embodiment, if Figure 4 As shown, a first liquid level sensor 24 is provided in the first ink cartridge 21, and the first liquid level sensor 24 is used to detect the liquid level of the ink in the first ink cartridge 21. When the first liquid level sensor 24 detects that the liquid level of the ink in the first ink cartridge 21 reaches the lower limit, the controller controls the circulation module 4 to drive the ink in the second ink cartridge 31 to transfer to the first ink cartridge 21, so that the liquid level of the ink in the first ink cartridge 21 rises; when the first liquid level sensor 24 detects that the liquid level of the ink in the first ink cartridge 21 reaches the upper limit, the controller controls the circulation module 4 to stop working, and the ink in the second ink cartridge 31 is no longer transferred to the first ink cartridge 21, so that the liquid level of the ink in the first ink cartridge 21 is continuously between the lower limit and the upper limit, thereby maintaining the stable operation of the print head 100.

[0090] In the specific implementation process, the first liquid level sensor 24 is an analog liquid level sensor. By using the analog liquid level sensor, the detection sensitivity of the liquid level of the ink in the first ink cartridge 21 can be effectively improved, thereby helping to improve the response speed of positive pressure regulation and liquid level regulation, and improve the stability of the positive pressure in the first ink cartridge 21, thereby helping to improve the working stability of the print head 100. Of course, in other embodiments, the first liquid level sensor 24 can also be a float liquid level sensor with a lower cost.

[0091] In one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the circulation module 4 also includes a second filter 44 and a second anti-backflow valve 45 arranged on the circulation ink tube 41, the second filter 44 is located on the side of the heat exchange component 43 away from the second ink cartridge 31, and the second anti-backflow valve 45 is located on the side of the second filter 44 close to the second ink cartridge 31. The second filter 44 is used to filter and preliminarily remove bubbles from the ink that is about to enter the first ink cartridge 21 to improve the cleanliness of the ink in the first ink cartridge 21. In the specific implementation process, the second filter 44 is provided with an air outlet to discharge bubbles in the ink. Further, the second anti-backflow valve 45 is a one-way valve.

[0092] In one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the heat exchange component 43 includes a water-cooled heat exchanger 431 and a heating structure 432. The water-cooled heat exchanger 431 includes a heat exchange body 4311, and a water pipeline and an ink pipeline arranged in the heat exchange body 4311. The water pipeline is used to connect to an external water cooling system, and the ink pipeline is connected to a circulating ink tube 41. Both the water pipeline and the ink pipeline can exchange heat with the heat exchange body 4311; the heating structure 432 is arranged in the heat exchange body 4311, and can exchange heat with the heat exchange body 4311.

[0093] On the one hand, by providing a water-cooled heat exchanger 431 to cool the ink, and providing a heating structure 432 to heat the ink, the temperature of the ink can be raised and lowered, so that the ink is in a better temperature range, which is beneficial for the ink to maintain effective performance and improve the working stability of the print head 100. On the other hand, the water-cooled heat exchanger 431 and the heating structure 432 are provided as a whole, and the same heat exchange body 4311 is used to exchange heat with the ink, which helps to simplify the overall structure of the heat exchange component 43, and is beneficial to improve the compactness of the structure of the heat exchange component 43, which is beneficial to the overall miniaturization of the ink path system. In the specific implementation process, the heat exchange body 4311 can be made of a heat-conducting metal.

[0094] In one embodiment, the water channel and the ink channel are staggered inside the heat exchange body 4311 to improve the heat exchange efficiency between the two. When the ink needs to be cooled, the external water cooling system delivers low-temperature water to the water channel, and the low-temperature water cools the water channel. Then the water channel absorbs the heat of the heat exchange body 4311, cooling the heat exchange body 4311. Finally, the heat exchange body 4311 absorbs the heat of the ink channel, thereby cooling the ink. In the specific implementation process, the first heat exchange inlet 4312 and the first heat exchange outlet 4313 are provided at both ends of the ink channel, which are exposed to the heat exchange body 4311. The first heat exchange inlet 4312 and the first heat exchange outlet 4313 are both connected to the circulating ink tube 41; the second heat exchange inlet 4314 and the second heat exchange outlet 4315 are provided at both ends of the water channel, which are exposed to the heat exchange body 4311. The second heat exchange inlet 4314 and the second heat exchange outlet 4315 are both connected to the external water cooling system.

[0095] In one embodiment, the heating structure 432 is a heating belt covering the outer periphery of the heat exchange body 4311. When the ink needs to be heated, the heating belt generates heat and transfers the heat to the heat exchange body 4311, and then the heat exchange body 4311 transfers the heat to the ink pipe, thereby heating the ink. Of course, in other embodiments, the heating structure 432 can also be a heating pad arranged at the bottom of the heat exchange body 4311 or other types of devices capable of generating heat.

[0096] In one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the heat exchange component 43 also includes a temperature sensor 433, which is disposed in the ink inlet module 2 and can detect the temperature of the ink in the ink inlet module 2. The temperature sensor 433 is electrically connected to the heating structure 432 and the water-cooled heat exchanger 431. In a specific implementation, the temperature sensor 433 is disposed in the first ink cartridge 21 and can detect the temperature of the ink in the first ink cartridge 21. The temperature sensor 433 is a thermal resistor.

[0097] By setting a temperature sensor 433 in the first ink cartridge 21 and electrically connecting the temperature sensor 433 to the heating structure 432 and the water-cooled heat exchanger 431, closed-loop control of the temperature rise and fall of the ink can be achieved, thereby achieving a dynamic balance of the ink temperature and improving the reliability of the ink temperature control.

[0098] In one embodiment, if Figure 2 , Figure 3 and Figure 6As shown, the heat exchange component 43 also includes a temperature controller 434 and an overheat protector 435. The temperature controller 434 is electrically connected to the temperature sensor 433, the heating structure 432, and the water-cooled heat exchanger 431 respectively. The temperature sensor 433 feeds back the acquired ink temperature to the temperature controller 434, and then the temperature controller 434 controls the water-cooled heat exchanger 431 or the heating structure 432 to work, thereby adjusting the temperature of the ink. The overheat protector 435 is arranged between the temperature controller 434 and the heating structure 432. When the temperature of the heating structure 432 is too high, the overheat protector 435 can disconnect the heating structure 432 from the temperature controller 434, so that the heating structure 432 stops heating, and the temperature controller 434 is effectively protected to prevent the temperature controller 434 from being damaged due to excessive temperature.

[0099] In one embodiment, if Figures 1 to 3 As shown, the ink circuit system further includes a degassing module 6, which is connected to the circulation module 4, and the degassing module 6 can remove bubbles from the ink in the circulation module 4. In a specific implementation, the degassing module 6 is connected to the circulation ink tube 41, and the degassing module 6 can remove bubbles from the ink in the circulation ink tube 41.

[0100] By arranging the degassing module 6 on the circulating ink tube 41 , the ink about to enter the first ink cartridge 21 can be deaerated to reduce the bubble content in the ink, thereby improving the working stability of the print head 100 .

[0101] In one embodiment, if Figure 1 As shown, the degassing module 6 includes a degassing reaction box 61, a degassing pressure regulating component 62 and a degassing pressure generating component 63. The degassing reaction box 61 is connected to the circulating ink tube 41. The degassing pressure regulating component 62 is connected to the degassing reaction box 61 and is used to regulate the pressure of the degassing reaction box 61 so that the degassing reaction box 61 is in a negative pressure state, so as to improve the efficiency of degassing. The degassing pressure generating component 63 is connected to the degassing pressure regulating component 62 and is used to generate negative pressure and provide negative pressure to the degassing pressure regulating component 62.

[0102] The present application also provides a printer, which includes a print head 100 and the above-mentioned ink path system, and the print head 100 is connected to the ink path system.

[0103] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An ink path system, characterized in that: include: A nozzle connection module, the nozzle connection module is used to connect with the printing nozzle, and the nozzle connection module includes an ink inlet pipe and an ink return pipe; An ink inlet module, the ink inlet module is connected to the ink inlet tube, and the ink inlet module can form a preset positive pressure in the inner cavity of the ink inlet tube; An ink return module, wherein the ink cartridge of the ink return module is connected to the ink return tube, the ink return module can form a preset negative pressure in the inner cavity of the ink return tube, and the preset positive pressure and the preset negative pressure can drive the ink to pass through the print head at a preset speed; An ink supply module, the ink supply module is connected to the ink cartridge of the ink return module, and the ink supply module is used to supply ink to the ink cartridge of the ink return module; The ink inlet module delivers ink to the ink inlet tube at a first ink delivery speed so that the inner cavity of the ink inlet tube forms the preset positive pressure; the ink return module draws ink from the ink return tube at a second ink delivery speed so that the inner cavity of the ink return tube forms the preset negative pressure, and the first ink delivery speed is greater than the second ink delivery speed.

2. The ink path system according to claim 1, characterized in that: The ink supply module comprises a first ink cartridge and a first ink supply pump, one end of the first ink supply pump is connected to the first ink cartridge, the other end of the first ink supply pump is connected to the ink supply tube, and the first ink supply pump is used to drive ink to flow into the ink supply tube at the first ink supply speed; The ink return module includes a second ink cartridge and a second ink supply pump, one end of the second ink supply pump is connected to the second ink cartridge, the other end of the second ink supply pump is connected to the ink return tube, and the second ink supply pump is used to drive ink to flow away from the ink return tube at the second ink delivery speed.

3. The ink path system according to claim 1, characterized in that: The first ink feeding speed is 1.01 to 2 times the second ink feeding speed.

4. The ink path system according to claim 1, characterized in that: The ink feed module includes a first ink cartridge and a first pressure control subsystem connected to the first ink cartridge, the first ink cartridge is connected to the ink feed tube, and the first pressure control subsystem is used to enable the first ink cartridge to deliver ink to the ink feed tube at the first ink delivery speed; The ink return module includes a second ink cartridge and a second pressure control subsystem connected to the second ink cartridge, the second ink cartridge is connected to the ink return tube, and the second pressure control subsystem is used to enable the second ink cartridge to extract ink from the ink return tube at the second ink delivery speed.

5. The ink path system according to claim 4, characterized in that: The first pressure control subsystem includes a positive pressure regulating component and a positive pressure generating component. The positive pressure regulating component is connected to the first ink cartridge. The positive pressure regulating component can adjust the pressure of the first ink cartridge so that the inner cavity of the ink inlet tube forms the preset positive pressure. The positive pressure generating component is connected to the positive pressure regulating component. The positive pressure generating component is used to generate positive pressure and provide positive pressure to the positive pressure regulating component.

6. The ink path system according to claim 4, characterized in that: The second pressure control subsystem includes a negative pressure regulating component and a negative pressure generating component. The negative pressure regulating component is connected to the second ink cartridge. The negative pressure regulating component can adjust the pressure of the second ink cartridge so that the inner cavity of the ink return tube forms the preset negative pressure. The negative pressure generating component is connected to the negative pressure regulating component. The negative pressure generating component is used to generate negative pressure and provide negative pressure to the negative pressure regulating component.

7. The ink path system according to any one of claims 1 to 6, characterized in that: The ink path system also includes a circulation module, one end of which is connected to the ink inlet module, and the other end of which is connected to the ink return module. The circulation module can drive ink to transfer from the ink return module to the ink inlet module.

8. The ink path system according to claim 7, characterized in that: The circulation module includes a circulation ink tube, and a circulation pump and a heat exchange component arranged on the circulation ink tube. One end of the circulation ink tube is connected to the ink inlet module, and the other end of the circulation ink tube is connected to the ink return module. The circulation pump is used to drive the ink to transfer from the ink return module to the ink inlet module, and the heat exchange component is used to regulate the temperature of the ink.

9. The ink path system according to claim 8, characterized in that: The heat exchange component includes a water-cooled heat exchanger and a heating structure. The water-cooled heat exchanger includes a heat exchange body, and a water pipeline and an ink pipeline arranged in the heat exchange body. The water pipeline is used to connect to an external water cooling system, and the ink pipeline is connected to the circulating ink tube. Both the water pipeline and the ink pipeline can exchange heat with the heat exchange body; the heating structure is arranged in the heat exchange body and can exchange heat with the heat exchange body.

10. The ink path system according to claim 9, characterized in that: The heat exchange component also includes a temperature sensor, which is arranged in the ink inlet module and can detect the temperature of the ink in the ink inlet module. The temperature sensor is electrically connected to the heating structure and the water-cooled heat exchanger.

11. The ink path system according to claim 7, characterized in that: The ink path system further comprises a degassing module, which is connected to the circulation module and can remove bubbles from the ink in the circulation module.

12. A printer, characterized in that: It comprises a printing nozzle and the ink circuit system according to any one of claims 1 to 11, wherein the printing nozzle is connected to the ink circuit system.

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