Anti-fluctuation ink path system

Abstract

The utility model relates to an anti-fluctuation ink path system. The utility model relates to an anti-fluctuation ink path system, which comprises an ink box, a first ink return port and a second ink return port, wherein the box body of the ink box is provided with an ink outlet, a first ink return port and a second ink return port; the shunting assembly comprises an ink supply pump, a main ink path and branch ink paths, the ink inlet end of the main ink path is communicated with the ink outlet through the ink supply pump, the ink outlet end of the main ink path is communicated with the first ink return opening, and the multiple branch ink paths are arranged between the ink inlet end and the ink outlet end at intervals; the number of the printing heads is multiple, and the printing heads are respectively communicated with the branch ink paths; and one end of the recovery pump is communicated with the printing head, and the other end of the recovery pump is communicated with the second ink return port. The anti-fluctuation ink path system provided by the utility model has the advantages of small pressure fluctuation and stable ink jet.

Description

TECHNICAL FIELD

[0001] The utility model relates to the printing field especially, and it relates to a wave prevention ink path system. BACKGROUND

[0002] The existing inkjet machine needs to supply ink to the nozzle through the ink path system, and when there are multiple nozzles, these nozzles are communicated with the ink tank through branch ink paths. However, due to the different ink output states of each nozzle in actual use, the consumption of ink in each branch ink path is different, which leads to a large pressure fluctuation in the ink path, and the pressure fluctuation in one branch ink path also affects the pressure in other branch ink paths. This pressure fluctuation in high-precision inkjet machines will lead to unstable inkjet effect, so the existing inkjet machine cannot meet the market demand. Although the industry currently uses software to compensate or control the pressure, this method has slow response speed and cannot meet the actual use requirements. SUMMARY

[0003] Therefore, the utility model discloses a wave prevention ink path system which has the advantages of small pressure fluctuation and stable inkjet.

[0004] A wave prevention ink path system, comprising:

[0005] An ink tank, which is provided with an ink outlet, a first ink return port and a second ink return port on the tank body;

[0006] A shunt assembly, comprising an ink supply pump, a main ink path and branch ink paths, the ink inlet end of the main ink path is communicated with the ink outlet through the ink supply pump, the ink outlet end is communicated with the first ink return port, and a plurality of branch ink paths are arranged between the ink inlet end and the ink outlet end;

[0007] A plurality of print heads, which are respectively communicated with the branch ink paths;

[0008] A recovery pump, which is communicated with the print heads at one end and is communicated with the second ink return port at the other end.

[0009] The wave prevention ink path system can slow down the pressure fluctuation through double circulation loop and dilute the ink, so as to improve the inkjet stability and the printing quality.

[0010] Further, the flow of the main ink path is much larger than the sum of the flows of the branch ink paths. This structure can greatly reduce the influence of the pressure fluctuation between the branch ink paths, so as to improve the stability of the pressure at the print head.

[0011] Further, the cross section of the main ink path is at least 8 times of the cross section of the branch ink path. This structure can realize the flow difference requirement of the main ink path and the branch ink path, and ensure the stability of the pressure in the ink path.

[0012] Further, the shunt assembly further comprises a first buffer, and the ink inlet end of the main ink path is communicated with the ink supply pump through the first buffer. The first buffer can reduce the influence of the fluctuation of the ink supply pump on the pressure in the ink path, and improve the stability of the pressure in the ink path.

[0013] Further, the shunt assembly further comprises a first control valve and a second control valve, the ink outlet end of the main ink path is communicated with the first ink return port through the first control valve, and the branch ink path is communicated with the main ink path through the second control valve. This structure can control the communication and interruption of the ink path through the control valves, so as to adapt to the use requirement of different number of print heads in actual printing.

[0014] Further, a second buffer is arranged at the ink inlet of the print head. The buffer can further reduce the pressure fluctuation in the ink path caused by the shunt assembly, and improve the stability of the pressure in the print head.

[0015] Further, the shunt assembly further comprises a first pressure sensor, and the first pressure sensor is used for detecting the pressure in the main ink path, so as to ensure that the pressure in the main ink path is at a preset value.

[0016] Further, the print head is communicated with the recovery pump through a second pressure sensor, and the second pressure sensor is arranged close to the recovery pump or on the print head, so as to ensure that the pressure sensor can detect the dynamic change of the pressure in the ink path.

[0017] Further, the recovery pump is communicated with the print head through a third control valve, so as to control the on-off of the print head.

[0018] Further, a control assembly is further included, which comprises a circuit board and a processor, the circuit board is electrically connected with the first control valve, the second control valve, the third control valve, the ink supply pump and the recovery pump, so as to control the opening and closing of the valves and pumps, the circuit board is further connected with the first pressure sensor and the second pressure sensor, so as to obtain the sensor signals, and the processor is connected with the print head, so as to input the printing content to the print head. This structure can control and detect the ink path system, and ensure that the pressure in the ink path is stably in a preset value range.

[0019] In order to better understand and implement, the utility model is described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1A structure schematic view of the ink path system of the utility model,

[0021] Figure 2 A structure schematic view of the ink path system connecting multiple nozzle assembly of the utility model,

[0022] Mark explanation: 1, ink tank;21, ink supply pump;22, first buffer;23, main ink path;231, first control valve;232, second control valve;24, branch ink path;25, first pressure sensor;31, print head;32, second buffer;33, second pressure sensor;41, recovery pump;42, third control valve;51, circuit board;52, processor. Specific implementation

[0023] Please refer to Figures 1-2 , Figure 1 A structure schematic view of the ink path system of the utility model, Figure 2 The utility model discloses a kind of ink path systems of fluctuation prevention, including ink tank 1, shunt assembly, nozzle assembly, ink recovery assembly and control assembly.The ink tank 1 is used to store ink, ink flows into nozzle assembly after shunt assembly, and inkjet printing is carried out by nozzle assembly, while the remaining ink flows into ink tank 1 after ink recovery assembly, to realize the recovery of ink.The flow rate of ink is controlled by control assembly.

[0024] The ink tank 1 includes tank, which is provided with ink outlet, first ink return port and second ink return port, wherein the ink outlet is below the ink level, and the first ink return port and the second ink return port are above the ink level.

[0025] The shunt assembly includes ink supply pump 21, first buffer 22, main ink path 23, branch ink path 24 and first pressure sensor 25.The ink supply pump 21 is communicated with ink outlet, and pumps ink to main ink path 23 through first buffer 22.The first buffer 22 can be elastic hose, parts with air cavity or parts with elastic container, etc., which can play a buffering role, so as to slow down the pressure fluctuation of ink path when ink supply pump 21 works, and improve the stability of pressure at nozzle assembly.

[0026] The ink inlet end of the main ink path 23 is communicated with the first buffer 22, and the ink outlet end is communicated with the first ink return port through the first control valve 231.The main ink path 23 is provided with multiple branch ink paths 24 between the ink inlet end and the ink outlet end along the ink flow direction, and the branch ink path 24 is communicated with the main ink path 23 through the second control valve 232.In this embodiment, the branch ink path 24 has four, and the number of branch ink paths 24 can also be set according to actual needs.

[0027] To reduce the influence of pressure between branch ink paths 24, the flow of ink in main ink path 23 needs to be much greater than the sum of the flow of ink in branch ink paths 24, and the much greater can be, for example, at least 8 times the flow of ink in branch ink paths 24. As a preferred, to make the flow of ink in main ink path 23 much greater than the sum of the flow of ink in branch ink paths 24, the cross section of main ink path 23 is at least 8 times the cross section of branch ink paths 24. First pressure sensor 25 is used to detect the pressure in main ink path 23.

[0028] The inkjet head assembly includes a print head 31, a second buffer 32 and a second pressure sensor 33. The print head 31 has a plurality of and corresponds to each branch ink path 24, and in this embodiment, the print head 31 has four and communicates with four branch ink paths 24, Figure 1 Only one of the branch ink paths 24 is connected with the inkjet head assembly, Figure 2 The branch ink paths 24 are all connected with the inkjet head assembly.

[0029] The ink inlet of print head 31 is provided with a second buffer 32, which can be an elastic hose, a component provided with an air cavity or a container with elasticity, etc. to play a buffering role, so as to slow down the pressure fluctuation of the shunt assembly on the ink path and improve the stability of the pressure of print head 31. Print head 31 communicates with the ink recovery assembly through a second pressure sensor 33, which can be arranged near the ink recovery assembly or on print head 31, so as to detect the pressure of the ink recovery.

[0030] The ink recovery assembly includes a recovery pump 41 and a third control valve 42, one end of the recovery pump 41 communicates with print head 31 through the third control valve 42, and the other end communicates with the second ink recovery port of the box body, so as to recover the excess ink and reduce the consumption of ink, realizing energy saving and environmental protection.

[0031] The control assembly includes a circuit board 51 and a processor 52, the circuit board 51 is electrically connected with first control valve 231, second control valve 232, third control valve 42, first pressure sensor 25, second pressure sensor 33, ink supply pump 21 and recovery pump 41, so as to control the opening and closing of these valve bodies and pump bodies and obtain the sensor signal. The processor 52 is connected with print head 31, so as to input the printing content to print head 31.

[0032] During printing, the ink supply pump 21 draws ink from the ink tank 1. The ink flows into the main ink path 23 after passing through the buffer, and flows into the multiple printheads 31 through the branch ink paths 24. When the printheads 31 are in operation, the excess ink returns to the tank through the recovery pump 41, thereby forming a main circulation of the ink flow. At the same time, since the amount of ink in the main ink path 23 is greater than the sum of the amounts of ink in the branch ink paths 24, the excess ink in the main ink path 23 returns to the ink tank 1 through the first control valve 231, thereby forming a secondary circulation, which simultaneously functions as an ink agitator, thereby eliminating the need for an additional agitator and reducing product cost. When any of the four branch ink paths 24 is not needed, it can be simply blocked.

[0033] The secondary circulation can greatly reduce the influence of pressure fluctuation between the branch ink paths. Specifically, taking the four branch ink paths as an example, the flow rate of each branch ink path is , the flow rate of the main ink path is , and is much greater than or or or . Therefore, the flow rate at the ink inlet end is . Since the actual difference is not large, the influence of the change of on is described below, at this time is much greater than and . When changes , the change of the flow rate is proportionally shared by the other branch ink paths and the main ink path, and the fluctuations are and , at this time , and , it can be seen that the slight change of has a negligible influence on .

[0034] The ink path system capable of preventing fluctuation disclosed in the utility model, through double circulation loop, pressure fluctuation is slowed down and diluted, and the ink is also agitated, thereby improving the inkjet stability and improving the printing quality.

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

[0036] In the present application, unless otherwise explicitly specified and limited, if there are the terms "mounting", "connecting", "connecting", "fixing" and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise explicitly specified and limited, if there are the terms "first" and "second" and the like, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0038] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and the present application also intends to include these changes and modifications.

Claims

1. A surge protected ink path system characterized by, The application relates to a printing device, which comprises the following components: an ink tank, which is provided with an ink outlet, a first ink return port and a second ink return port; a shunt assembly, which comprises an ink supply pump, a main ink path and branch ink paths, the ink inlet end of the main ink path is communicated with the ink outlet through the ink supply pump, the ink outlet end is communicated with the first ink return port, and the ink inlet end and the ink outlet end are provided with a plurality of branch ink paths at intervals; a plurality of print heads, which are respectively communicated with the branch ink paths; a recovery pump, which is communicated with the print heads at one end and communicated with the second ink return port at the other end.

2. A surge protected ink path system as claimed in claim 1, wherein: The flow of the main ink path is far greater than the sum of the flows of the branch ink paths.

3. A surge protected ink path system as claimed in claim 2, wherein: The cross section of the main ink path is at least 8 times the cross section of the branch ink paths.

4. A surge protected ink path system as claimed in any one of claims 1 to 3, wherein: The shunt assembly further comprises a first buffer, and the ink inlet end of the main ink path is communicated with the ink supply pump through the first buffer.

5. A surge protected ink path system as claimed in claim 4, wherein: The shunt assembly further comprises a first control valve and a second control valve, the ink outlet end of the main ink path is communicated with the first ink return port through the first control valve, and the branch ink paths are communicated with the main ink path through the second control valve.

6. A surge protected ink path system as defined in claim 5, wherein: The ink inlet of the print head is provided with a second buffer.

7. A surge protected ink path system according to claim 5 or 6, characterised in that: The shunt assembly further comprises a first pressure sensor, which is used for detecting the pressure in the main ink path.

8. A surge protected ink path system as defined in claim 7, wherein: The print head is communicated with the recovery pump through a second pressure sensor, which is arranged close to the recovery pump or arranged on the print head.

9. A surge protected ink path system as defined in claim 8, wherein: The recovery pump is communicated with the print head through a third control valve.

10. A surge protected ink path system as defined in claim 9, wherein: The application further comprises a control assembly, which comprises a circuit board and a processor, the circuit board is electrically connected with the first control valve, the second control valve, the third control valve, the ink supply pump and the recovery pump, so as to control the opening and closing of the valves and pumps, the circuit board is further connected with the first pressure sensor and the second pressure sensor, so as to obtain the sensor signals, and the processor is connected with the print head, so as to input the printing content into the print head.

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