CN221233311U - Ink supply device and ink jet printing apparatus - Google Patents

Abstract

The utility model discloses an ink supply device and ink jet printing equipment, wherein the ink supply device comprises a main ink barrel, m sub ink barrels, an ink supply assembly, m first liquid level sensors and a control module, the ink supply assembly comprises a main pipeline, m branch pipelines and m first ink supply pumps, the main pipeline is communicated with the main ink barrel, the m branch pipelines are communicated with the main pipeline in a one-to-one mode, the m first ink supply pumps are arranged on the m branch pipelines in a one-to-one mode; the m first liquid level sensors are arranged on the m ink sub-barrels one by one; the control module is configured to turn on or off the respective first ink supply pump based on when the current liquid level value detected by the one or more first liquid level sensors reaches a first preset liquid level value. Specifically, when it is determined that the amount of ink in one or more sub-ink tanks is small, the corresponding first ink supply pump in the sub-ink tank is started, so that ink is automatically replenished for the corresponding sub-ink tank, and labor is saved.

Description

Ink supply device and ink jet printing apparatus

Technical Field

The present disclosure relates to printing apparatuses, and particularly to an ink supply device and an inkjet printing apparatus.

Background

In the related art, each printing device is correspondingly provided with a sub-ink barrel, so that the corresponding sub-ink barrel supplies ink for the printing device in the actual application process of the printing device, and therefore the printing device is guaranteed to have enough ink to finish printing.

However, after the ink in each sub-tank is exhausted, the worker needs to add ink to each sub-tank one by one. If the number of the sub-ink tanks is large, the staff needs to add ink to each sub-ink tank frequently, which results in a large working strength of the staff.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the ink supply device and the ink jet printing equipment, which can automatically supplement ink for the sub ink tanks, thereby saving manpower.

In a first aspect, an embodiment of the present application provides an ink supply apparatus including:

a main ink tank for storing ink;

m sub-ink tanks for storing ink and supplying ink to each printing apparatus;

The ink supply assembly comprises a main pipeline, m branch pipelines and m first ink supply pumps, wherein the main pipeline is communicated with the main ink barrel, the m branch pipelines are arranged in the sub ink barrels one by one and are communicated with the main pipeline, and the m first ink supply pumps are arranged in the m branch pipelines one by one;

The m first liquid level sensors are arranged on the m sub ink tanks one by one and are used for detecting the current liquid level value of the ink in each sub ink tank;

The control module is electrically connected with the m first ink supply pumps and the m first liquid level sensors, and is configured to turn on or turn off the corresponding first ink supply pumps when the current liquid level value detected by one or more first liquid level sensors reaches a first preset liquid level value.

According to some embodiments of the present utility model, the first preset liquid level value includes a first set value and a second set value, the first set value is smaller than the second set value, and when one or more first liquid level sensors detect that the current liquid level value of the corresponding sub-ink tank reaches the first set value, the control module controls the first ink supply pump corresponding to the sub-ink tank to be started; when one or more first liquid level sensors detect that the current liquid level value of the corresponding sub ink barrel reaches the second set value, the control module controls the corresponding first ink supply pump of the sub ink barrel to be closed.

According to some embodiments of the utility model, the first level sensor is provided as a float sensor.

According to some embodiments of the utility model, the ink supply device further comprises a second level sensor and an alarm device electrically connected, wherein the second level sensor is disposed on the main ink tank and is used for detecting a current level value in the main ink tank, and the alarm device is configured to: and when the second liquid level sensor detects that the liquid level value of the main ink barrel reaches a second preset liquid level value, the liquid level sensor is used for reminding of adding ink.

According to some embodiments of the utility model, the ink supply assembly further comprises:

The second ink supply pump is electrically connected with the control module and controlled to be opened or closed by the control module, and is arranged in the main pipeline and positioned in front of the connecting positions of the m branch pipelines and the main pipeline and used for conveying ink in the main ink barrel to each branch pipeline along the main pipeline;

m transfer pipelines, transfer pipeline's both ends with the branch pipeline is connected, just first ink supply pump set up in between the both ends of transfer pipeline.

M electromagnetic valves which are arranged on the branch pipelines one by one and are connected with the branch pipelines;

When the first liquid level sensor detects that the current liquid level value of the corresponding sub ink barrel reaches a first set value and the current liquid level value does not change within a preset time, the control module controls the second ink supply pump to be opened, and simultaneously controls corresponding electromagnetic valves of other first liquid level sensors to be closed so as to disconnect the corresponding branch pipelines;

According to some embodiments of the utility model, the ink supply assembly further comprises:

The m transfer pipelines are arranged in m branch pipelines one by one, two ends of each transfer pipeline are connected with the branch pipelines, and the first ink supply pump is arranged between two ends of each transfer pipeline;

The m third ink supply pumps are arranged in the transfer pipeline one by one and are connected with the branch pipeline, and the m third ink supply pumps are electrically connected with the control module and controlled to be opened or closed by the control module;

When the first liquid level sensor detects that the current liquid level value of the corresponding sub ink barrel reaches a first set value and the current liquid level value does not change within a preset time, the control module controls the corresponding third ink supply pump to be opened.

According to some embodiments of the utility model, the ink supply device further includes a plurality of communication pipes, the communication pipes being provided between adjacent ones of the sub-ink tanks so as to communicate the adjacent ones of the sub-ink tanks; the distance between the connecting position of the communicating pipeline at the sub ink barrel and the bottom of the sub ink barrel is larger than the second set value.

In a second aspect, an embodiment of the present application provides an inkjet printing apparatus, including:

The ink supply device described above;

and m printing devices, wherein the ink supply device is used for supplying ink to the m printing devices.

From the above technical solutions, the embodiment of the present application has the following advantages: according to the scheme, the current liquid level value of the ink in each sub-ink barrel can be detected through each first liquid level sensor, when the fact that the amount of the ink in one or more sub-ink barrels is reduced to a preset first liquid level value is determined, at the moment, the ink stored in the sub-ink barrels can not meet the requirement of continuously supplying the ink for the printing device, the control module controls the corresponding first ink supply pump of the sub-ink barrels to be opened, and therefore the ink stored in the main ink barrels is conveyed to the corresponding branch pipelines along the main pipeline under the action of the corresponding first ink supply pump, and the ink is added into the corresponding sub-ink barrels; in the ink adding process, when the ink in the sub ink tank rises to a preset other liquid level value, at this time, the liquid water stored in the sub ink tank already meets the requirement of continuously supplying ink for the printing device, the control module controls the first ink supply pump corresponding to the sub ink tank to be closed, and the ink supply assembly stops continuously adding ink for the sub ink tank. Compared with the prior art that the ink is manually added into the sub ink tanks, the application does not need to input more manpower to add the ink into the sub ink tanks, obviously, the scheme of the application saves the manpower, and the ink adding efficiency is obviously higher.

Drawings

FIG. 1 is a schematic view of a first ink supply device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a second ink supply device according to an embodiment of the present utility model;

Fig. 3 is a schematic structural view of a third ink supply device according to an embodiment of the present utility model.

Wherein the reference numerals have the following meanings:

100. A main ink tank; 110. a second liquid level sensor; 200. a sub ink tank; 210. a first liquid level sensor; 220. a communication pipe; 300. an ink supply assembly; 310. a main pipe; 320. a branch pipe; 330. a first ink supply pump; 340. a second ink supply pump; 350. a transfer pipeline; 360. a third ink supply pump; 370. an electromagnetic valve; 400. a printing apparatus.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, upper, lower, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model is described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, an ink supply device according to an embodiment of the present utility model includes a main ink tank 100, m sub ink tanks 200, an ink supply assembly 300, m first level sensors 210 and a control module, wherein the main ink tank 100 is used for storing ink; the m sub-tanks 200 are used to store ink and supply ink to each printing apparatus 400; the ink supply assembly 300 includes a main pipe 310, m branch pipes 320 and m first ink supply pumps 330, wherein the main pipe 310 is communicated with the main ink tank 100, m branch pipes 320 are arranged on the sub ink tanks 200 one by one and are communicated with the main pipe 310, and m first ink supply pumps 330 are arranged on m branch pipes 320 one by one; the m first level sensors 210 are disposed on the m sub-ink tanks 200 one by one, and are used for detecting the current level value of the ink in each sub-ink tank 200; a control module is electrically connected to the m first ink supply pumps 330 and the m first liquid level sensors 210, and the control module is configured to turn on or off the corresponding first ink supply pumps 330 when the current liquid level value detected by one or more of the first liquid level sensors 210 reaches a first preset liquid level value.

The first preset liquid level value is a liquid level value preset by the control module. In practical application, if the sub ink barrels 200 with the same size are adopted in the selection process, the first preset liquid level values correspondingly set by the sub ink barrels 200 are the same, and the control module performs closing or opening control on the first liquid supply pumps based on the first preset liquid level values; if there are sub-ink tanks 200 with different sizes in the sub-ink tanks 200 during selection, the first preset liquid level values set corresponding to the sub-ink tanks 200 with different sizes may also be different, so the control module performs closing or opening control on the first liquid supply pump based on the different first preset liquid level values for the first liquid supply pump corresponding to the sub-ink tank 200 with different sizes.

In the specific working process: the present application detects the current level value of the ink in each sub-ink tank 200 through each first level sensor 210, and when determining that the current ink amount in one or more sub-ink tanks 200 is decreasing to a preset level value, at this time, the ink amount stored in the sub-ink tank 200 may not be satisfied to continuously supply the ink to the printing device 400, and the control module controls the corresponding first ink supply pump 330 of the sub-ink tank 200 to be opened, so that the ink stored in the main ink tank 100 is conveyed to the corresponding branch pipeline 320 along the main pipeline 310 under the action of the corresponding first ink supply pump 330, thereby adding the ink to the corresponding sub-ink tank 200; in the ink adding process, when the ink in the sub-ink tank 200 rises to another preset level value, at this time, the liquid water stored in the sub-ink tank 200 is already satisfied to continuously supply ink to the printing device 400, and the control module controls the corresponding first ink supply pump 330 of the sub-ink tank 200 to be turned off, so that the ink supply assembly 300 stops continuously adding ink to the sub-ink tank 200. Compared with the prior art that the ink is manually added into the sub ink tank 200, more manpower is not needed to be input into the sub ink tank 200, obviously, the scheme of the application saves manpower, and the ink adding efficiency is obviously higher.

In some embodiments, the first preset level value includes a first set point and a second set point, the first set point is less than the second set point, and the first preset value is no greater than Yu Zimo one third of the overall height of the tub 200, and the second preset value is no less than Yu Zimo two thirds of the overall height of the tub 200. Specifically, when one or more of the first level sensors 210 detects that the current level value of the corresponding sub-ink tank 200 falls to the preset first set value, at this time, the amount of ink stored in the sub-ink tank 200 may not be enough to continuously supply ink to the printing apparatus 400, and the control module controls the corresponding first ink supply pump 330 of the sub-ink tank 200 to be turned on, so that the ink stored in the main ink tank 100 is transferred to the corresponding branch pipe 320 along the main pipe 310 under the action of the corresponding first ink supply pump 330, and ink is added to the corresponding sub-ink tank 200; in contrast, during the ink adding process, when the ink in the sub-ink tank 200 rises to the preset second set value, at this time, the liquid water stored in the sub-ink tank 200 already satisfies the requirement of continuously supplying ink to the printing device 400, and the control module controls the first ink supply pump 330 corresponding to the sub-ink tank 200 to be turned off, so that the ink supply assembly 300 stops continuously adding ink to the sub-ink tank 200.

In some embodiments, the first liquid level sensor 210 is configured as a float sensor, but is not limited to a float sensor, and a magnetic flap level gauge, a drop-in level gauge, a radar level gauge, an ultrasonic level gauge, a magnetostrictive level gauge, etc. may be used, which will not be described in detail.

In some embodiments, the ink supply device further includes a second level sensor 110 electrically connected, e.g., wired or communicatively connected, to the alarm device, wherein the second level sensor 110 is disposed on the main ink tank 100 for detecting a level value in the main ink tank 100. The second liquid level sensor 110 is configured as a float ball sensor, a magnetic flap liquid level meter, a throw-in liquid level meter, a radar liquid level meter, an ultrasonic liquid level meter, a magnetostrictive liquid level meter, or the like. When the second level sensor 110 detects that the current level value of the main ink tank 100 is lower than the second preset value, which indicates that the ink amount in the main ink tank 100 is smaller, the alarm device is used for reminding the staff of adding ink to the main ink tank. Wherein, the alarm device can be a buzzer, an alarm lamp or a screen display liquid level, etc.

In some embodiments, referring to fig. 2, the ink supply assembly 300 further includes a second ink supply pump 340, the second ink supply pump 340 is electrically connected to the control module, and the control module is configured to control the second ink supply pump 340 to be turned on or off. The second ink supply pump 340 is provided at the main conduit 310 and before the connection position of each branch conduit 320 with the main conduit 310, and thus, the second ink supply pump 340 can cause the ink in the main ink tank 100 to flow along the main conduit 310 toward each branch conduit 320. Meanwhile, the ink supply assembly 300 further includes a transfer pipe 350, two ends of the transfer pipe 350 are connected to the branch pipe 320, and the first ink supply pump 330 is disposed between two ends of the transfer pipe 350, that is, one end of the transfer pipe 350 is connected before the first ink supply pump 330, and the other end is connected after the first ink supply pump 330, the ink in the branch pipe 320 may not pass through the first ink supply pump 330 and pass over the first ink supply pump 330 through the transfer pipe 350, so as to complete the normal delivery of the ink.

In practice, one or more first ink supply pumps 330 are abnormal, resulting in the ink supply assembly 300 not being able to supply ink to the corresponding sub-ink tanks 200. Based on the above, when one or more first ink supply pumps 330 are in trouble, the second ink supply pump 340 may be activated to operate, and the ink in the main ink tank 100 may flow along the main pipe 310 to the branch pipe 320 and flow along the branch pipe 320 to the sub ink tanks 200; when the ink flows through the branch pipe 320, the ink may pass through the transfer pipe 350, so as to avoid interference of the abnormal first ink supply pump 330, and the ink may normally flow through the branch pipe 320, thereby completing the addition of the ink in the sub-ink tank 200.

The ink supply assembly 300 further includes m solenoid valves 370, where the m solenoid valves 370 are disposed on the branch pipes 320 and connected to the branch pipes 320, and each solenoid valve 370 is used for closing or opening the branch pipe 320. And the control module is electrically connected with the m electromagnetic valves 370, and is used for independently controlling the closing or opening of each electromagnetic valve 370. In particular, when ink is added to a part of the sub-tanks 200, in order to prevent ink from flowing to other sub-tanks 200 through the transfer pipeline 350, the control module controls the corresponding solenoid valves 370 to be closed, thereby ensuring that ink is added to only a part of the sub-tanks 200.

In determining whether the first ink supply pump 330 is abnormal, in one possible embodiment, when it is determined that the printing apparatus is operating normally, the first level sensor 210 detects that the current liquid level value of the corresponding sub-ink tank 200 reaches the first set value, and when the current liquid level value does not change within the preset time, it is indicated that the first ink supply pump 330 is in an abnormal state, and ink cannot be added to the corresponding sub-ink tank 200. At this time, the control module controls the second ink supply pump 340 to be opened, and simultaneously controls the corresponding solenoid valves 370 of the remaining first level sensors 210 to be closed to disconnect the corresponding branch pipes 320, and at this time, the second ink supply pump 340 charges the sub-ink tanks 200 with ink.

In order to ensure that the first ink supply pump 330 still operates normally when abnormal conditions occur, in other possible embodiments, referring to fig. 3, the ink supply assembly 300 further includes m transfer pipes 350 and m third ink supply pumps 360, where the m transfer pipes 250 are disposed in the m branch pipes 320 one by one, two ends of the transfer pipes 350 are connected to the branch pipes 320, and the first ink supply pump 330 is disposed between two ends of the transfer pipes 350, that is, one end of the transfer pipe 350 is connected before the first ink supply pump 330, and the other end is connected after the first ink supply pump 330. The m third ink supply pumps 360 are disposed in the transfer pipeline 350 one by one and connected to the branch pipeline 320. The m third ink supply pumps 360 are electrically connected with the control module, and the control module controls the third ink supply pumps 360 to be turned on or off. Thus, upon detecting an abnormality in one or more of the first ink supply pumps 330, the control module may turn on the corresponding third ink supply pump 360 to operate in place of the first ink supply pump 330, thereby adding ink to the corresponding sub-ink tanks 200.

In determining whether the first ink supply pump 330 is abnormal, in one possible embodiment, when it is determined that the printing apparatus is operating normally, the first level sensor 210 detects that the current liquid level value of the corresponding sub-ink tank 200 reaches the first set value, and when the current liquid level value does not change within the preset time, it is indicated that the first ink supply pump 330 is in an abnormal state, and ink cannot be added to the corresponding sub-ink tank 200. At this time, the control module controls the third ink supply pump 360 to be turned on, and the third ink supply pump 360 adds ink to the corresponding sub-ink tank 200.

In some embodiments, referring to fig. 1, the ink supply device further includes a plurality of communication pipes 220, and the communication pipes 220 are provided between adjacent sub-ink tanks 200, and the adjacent sub-ink tanks 200 are communicated, whereby the respective sub-ink tanks 200 are communicated. Wherein, the distance between the connection position of the communicating pipe 220 at the sub ink tank 200 and the bottom of the ion ink tank 200 is greater than the second set value, and thus, the communicating pipe 220 does not affect the normal storage of ink in the sub ink tank 200. It will be appreciated that when one of the sub-tanks 200 is excessively filled with ink and the ink supply assembly 300 is abnormal, the ink in the sub-tank 200 may flow to the other sub-tanks 200 to avoid overflow of the ink; meanwhile, the sub-pipeline can be provided with a flow detector, and if the flow detector detects that ink passes through, the abnormality of the ink supply device is indicated, and the maintenance of staff is required.

The application also discloses an ink-jet printing device, referring to fig. 1, comprising the ink supply device and m printing devices, wherein the ink supply device is used for supplying ink to the m printing devices.

Specifically, the above-mentioned ink supply device is adopted in the inkjet printing apparatus, when the ink supply device is in use, the current level value of the ink in each sub-ink tank 200 is detected by each first level sensor 210, and when it is determined that the current ink amount in one or more sub-ink tanks 200 falls to a preset level value, at this time, the ink amount stored in the sub-ink tank 200 may not be able to continuously supply the ink to the printing apparatus 400, and the control module controls the corresponding first ink supply pump 330 of the sub-ink tank 200 to be turned on, so that the ink stored in the main ink tank 100 is conveyed to the corresponding branch pipe 320 along the main pipe 310 under the action of the corresponding first ink supply pump 330, so as to add the ink to the corresponding sub-ink tank 200; in the ink adding process, when the ink in the sub-ink tank 200 rises to another preset level value, at this time, the liquid water stored in the sub-ink tank 200 is already satisfied to continuously supply ink to the printing device 400, and the control module controls the corresponding first ink supply pump 330 of the sub-ink tank 200 to be turned off, so that the ink supply assembly 300 stops continuously adding ink to the sub-ink tank 200. As can be seen, each sub-tank 200 of the ink supply device is timely replenished with ink, thereby ensuring that the printing device 400 can continue to operate.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (8)

1. An ink supply device, comprising:

a main ink tank for storing ink;

m sub-ink tanks for storing ink and supplying ink to each printing apparatus;

The ink supply assembly comprises a main pipeline, m branch pipelines and m first ink supply pumps, wherein the main pipeline is communicated with the main ink barrel, the m branch pipelines are arranged in the sub ink barrels one by one and are communicated with the main pipeline, and the m first ink supply pumps are arranged in the m branch pipelines one by one;

The m first liquid level sensors are arranged on the m sub ink tanks one by one and are used for detecting the current liquid level value of the ink in each sub ink tank;

The control module is electrically connected with the m first ink supply pumps and the m first liquid level sensors, and is configured to turn on or turn off the corresponding first ink supply pumps when the current liquid level value detected by one or more first liquid level sensors reaches a first preset liquid level value.

2. The ink supply device according to claim 1, wherein the first preset liquid level value includes a first set value and a second set value, the first set value is smaller than the second set value, and when one or more first liquid level sensors detect that the current liquid level value of the corresponding sub ink tank reaches the first set value, the control module controls the first ink supply pump corresponding to the sub ink tank to be started; when one or more first liquid level sensors detect that the current liquid level value of the corresponding sub ink barrel reaches the second set value, the control module controls the corresponding first ink supply pump of the sub ink barrel to be closed.

3. The ink supply of claim 1, wherein the first level sensor is configured as a float sensor.

4. The ink supply of claim 1, further comprising a second level sensor electrically connected to an alarm device, wherein the second level sensor is disposed in the main ink tank for detecting a current level value in the main ink tank, the alarm device configured to: and when the second liquid level sensor detects that the liquid level value of the main ink barrel reaches a second preset liquid level value, the liquid level sensor is used for reminding of adding ink.

5. The ink supply of claim 2, wherein the ink supply assembly further comprises:

The second ink supply pump is electrically connected with the control module and controlled to be opened or closed by the control module, and is arranged in the main pipeline and positioned in front of the connecting positions of the m branch pipelines and the main pipeline and used for conveying ink in the main ink barrel to each branch pipeline along the main pipeline;

The two ends of the transfer pipelines are connected with the branch pipelines, and the first ink supply pump is arranged between the two ends of the transfer pipelines;

m electromagnetic valves which are arranged on the branch pipelines one by one and are connected with the branch pipelines;

When the first liquid level sensor detects that the current liquid level value of the corresponding sub ink barrel reaches a first set value and the current liquid level value does not change within a preset time, the control module controls the second ink supply pump to be opened, and simultaneously controls corresponding electromagnetic valves of other first liquid level sensors to be closed so as to disconnect the corresponding branch pipelines.

6. The ink supply of claim 1, wherein the ink supply assembly further comprises:

The m transfer pipelines are arranged in m branch pipelines one by one, two ends of each transfer pipeline are connected with the branch pipelines, and the first ink supply pump is arranged between two ends of each transfer pipeline;

The m third ink supply pumps are arranged in the transfer pipeline one by one and are connected with the branch pipeline, and the m third ink supply pumps are electrically connected with the control module and controlled to be opened or closed by the control module;

When the first liquid level sensor detects that the current liquid level value of the corresponding sub ink barrel reaches a first set value and the current liquid level value does not change within a preset time, the control module controls the corresponding third ink supply pump to be opened.

7. The ink supply device according to claim 2, further comprising a plurality of communication pipes provided between adjacent ones of the sub-ink tanks to communicate the adjacent ones of the sub-ink tanks; the distance between the connecting position of the communicating pipeline at the sub ink barrel and the bottom of the sub ink barrel is larger than the second set value.

8. An inkjet printing apparatus, comprising:

the ink supply apparatus of any one of claims 1 to 7;

and m printing devices, wherein the ink supply device is used for supplying ink to the m printing devices.