Filtering subsystem and fountain solution circulating system of printing machine

Abstract

The utility model provides a filtering subsystem and a fountain solution circulating system of a printing machine, belongs to the field of printing, and is used for solving the problem that the whole printing production rhythm is influenced due to the fact that a large amount of backflow fountain solution which is supplied in a centralized manner is filtered through a filter bag and the replacement frequency of the filter bag is increased in the prior art. The water inlet end of a water return pipe is communicated with the water outlet end of the printing machine; the filter cloth is movably arranged, the filter cloth section, used for filtering the fountain solution flowing out of the water return pipe, on the filter cloth is a filter cloth filtering section, the filter cloth filtering section is located below the water outlet end of the water return pipe, the fountain solution flowing out of the water return pipe falls onto the filter cloth filtering section, and the length of the whole filter cloth is larger than that of the filter cloth filtering section. When the filtering effect of the filter cloth is poor, the filter cloth is moved, so that the rest part of the filter cloth is moved to the lower part of the water outlet end of the water return pipe, the quick replacement of the filter section of the filter cloth is realized, and the filtering effect of the filter cloth can be ensured.

Description

Technical Field

[0001] The utility model belongs to the field of printing, in particular to a filtering subsystem and a fountain solution circulation system of a printing machine. Background Art

[0002] In a centralized liquid supply printing system, fountain solution is supplied to multiple printing presses through a liquid storage tank. The fountain solution flowing out of the printing press needs to be filtered before it can be reused. Generally, the refluxed fountain solution is filtered through a filter bag. If the filtering effect of the filter bag is not good, the filter bag needs to be replaced to ensure the filtering effect of the fountain solution return water.

[0003] Since there are a certain number of printing presses with centralized liquid supply, the amount of fountain solution flowing back will be relatively large. When filtering through the filter bag, the filter bag will absorb more impurities in a shorter time. In order to ensure the cleanliness of the fountain solution return water, the filter bag needs to be replaced. When replacing the filter bag, printing needs to be stopped to prevent the dirty fountain solution from flowing back into the water tank and contaminating the fountain solution in the water tank. If the filter bag is replaced frequently, it will affect the entire printing production rhythm.

[0004] In summary, the existing centralized liquid supply printing system has the following problems: the centralized liquid supply has a large amount of reflux fountain solution, which will increase the frequency of filter bag replacement if filtered through filter bags, thus affecting the rhythm of the entire printing production. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of the present utility model is to provide a filtering subsystem and a fountain solution circulation system for a printing press, which is used to solve the problem in the prior art that a large amount of reflux fountain solution is provided in the centralized liquid supply, and filtering through filter bags will increase the frequency of filter bag replacement, thereby affecting the rhythm of the entire printing production.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a filtering subsystem of a printing press, the filtering subsystem comprising:

[0007] A water return pipe, the water inlet end of the water return pipe is connected to the water outlet end of the printing press;

[0008] The filter cloth is arranged to move, the filter cloth section on the filter cloth that filters the fountain solution flowing out of the return pipe is the filter cloth filter section, the filter cloth filter section is located below the water outlet end of the return pipe, the fountain solution returning from the return pipe falls onto the filter cloth filter section, and the length of the entire filter cloth is greater than the length of the filter cloth filter section.

[0009] As an optional solution, the filter cloth filtering section is arranged in a shape that increases the filtering time of the fountain solution return water.

[0010] As an optional solution, the filter cloth filtering section is an upward convex curved surface;

[0011] Or the filter cloth filtering section is a concave curved surface;

[0012] Or the filter cloth filtering section is an inclined straight surface.

[0013] As an optional solution, the filtering subsystem further includes a detection component for detecting the filtering effect of the filter cloth;

[0014] The detection assembly includes a liquid level detector and a plurality of water baffles;

[0015] A plurality of the water retaining plates and the filter cloth filter section form a liquid retaining area with an upper opening, and the liquid level detector is arranged in the liquid retaining area above the filter cloth filter section;

[0016] The liquid level detector controls the movement of the filter cloth according to the liquid level signal.

[0017] As an optional solution, the filtering subsystem further includes a driving shaft and a driven shaft;

[0018] The driving shaft and the driven shaft are both rotatably arranged, the rotation axis of the driving shaft is parallel to the rotation axis of the driven shaft, one end of the filter cloth is rolled up on the driving shaft, the other end of the filter cloth is rolled up on the driven shaft, and the filter section of the filter cloth is located between the driving shaft and the driven shaft.

[0019] As an optional solution, the filtering subsystem further includes a water return buffer for reducing the pressure of the fountain solution flowing out of the water return pipe;

[0020] The water return buffer comprises a buffer body, a water storage cavity and a water outlet;

[0021] A water storage cavity is provided in the buffer body, a water outlet is provided on the buffer body, the return water pipe extends into the water storage cavity, and the extension line of the water outlet end of the return water pipe does not coincide with the water outlet.

[0022] As an optional solution, the filtering subsystem further comprises a collecting box for collecting the fountain solution after filtering;

[0023] The collecting box is located below the filter cloth filtering section.

[0024] The utility model provides a fountain solution circulation system, comprising the above-mentioned filtering subsystem of a printing press, wherein the circulation system further comprises a centralized water supply tank, a water inlet pipe and at least two printing presses;

[0025] The centralized water supply tank is connected to the collection tank;

[0026] The water inlet ends of at least two of the printing machines are connected to the centralized water supply tank through water inlet pipes.

[0027] As an optional solution, the circulation system further includes a connecting pipe and a first filter;

[0028] One end of the connecting pipe is connected to the collecting box, the other end of the connecting pipe is connected to the centralized water supply box, and the first filter is arranged on the connecting pipe.

[0029] As an optional solution, the circulation system further includes a circulation pipeline and at least one second filter;

[0030] Both ends of the circulation pipeline are connected to the centralized water supply tank to form a circulation passage, and the second filter is arranged on the circulation pipeline.

[0031] As described above, the filtering subsystem and fountain solution circulation system of a printing press proposed by the utility model have at least the following beneficial effects:

[0032] 1. When the filtering effect of the filter cloth is not good, move the filter cloth so that the rest of the filter cloth moves to the bottom of the water outlet of the return pipe, so as to replace the filtering section of the filter cloth and ensure the filtering effect of the filter cloth;

[0033] 2. The present application arranges the filter cloth filter section in a shape that increases the filtering time of the fountain solution return water, thereby fully filtering the fountain solution return water, thereby ensuring the filtering effect;

[0034] 3. The liquid level detector provided in the present application can automatically control the movement of the filter cloth when water accumulates on the filter cloth filter section, thereby realizing automatic replacement of the filter cloth filter section. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a filtering subsystem of the utility model in which the filter cloth filtering section is an inclined upward convex curved surface;

[0036] Figure 2 The structure schematic diagram of the filter subsystem of the utility model is shown in which the filter cloth filter section is an inclined downward convex surface;

[0037] Figure 3 It is a schematic structural diagram of a filtering subsystem of the utility model in which the filter cloth filtering section is an inclined straight surface;

[0038] Figure 4 The structure cross-sectional view of the filter subsystem of the utility model showing that the filter cloth filter section is an inclined upward convex surface;

[0039] Figure 5 Shown is one embodiment of the water return buffer of the present utility model;

[0040] Figure 6 Another embodiment of the water return buffer of the present invention is shown;

[0041] Figure 7 Shown is a schematic structural diagram of the circulation system of the utility model.

[0042] In the figure: 11, water return pipe; 12, printing press; 13, filter cloth;

[0043] 21. Liquid level detector; 22. Water retaining plate;

[0044] 31. Driving shaft; 32. Driven shaft;

[0045] 4. Water return buffer; 41. Buffer body; 42. Water storage cavity; 43. Water outlet;

[0046] 51. Collection box; 52. Centralized water supply tank; 53. Water inlet pipe; 54. Connecting pipe; 55. First filter; 56. Circulation pipeline; 57. Second filter. DETAILED DESCRIPTION

[0047] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0048] See also Figures 1 to 7 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0049] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0050] See also Figures 1 to 6 The utility model provides a filtering subsystem of a printing press, the filtering subsystem comprising:

[0051] A water return pipe 11, wherein the water inlet end of the water return pipe 11 is connected to the water outlet end of the printing press 12;

[0052] The printing press 12 is not limited here. The printing press 12 may be a commercial rotary printing press or a sheet-fed offset printing press. Taking a commercial rotary printing press as an example, the return water of the fountain solution of the commercial rotary printing press is relatively dirty, and the content of impurities such as paper fibers and ink in the return water of the fountain solution is much higher than that of the sheet-fed offset printing press. During the production of the commercial rotary printing press, if the return water of the fountain solution is filtered through a general filter bag or filter screen, the filter bag or filter screen will be blocked in a short time, causing difficulty in returning water.

[0053] The filter cloth 13 is arranged to be movable. The filter cloth section on the filter cloth 13 that filters the fountain solution flowing out of the return pipe 11 is the filter cloth filter section. The filter cloth filter section is located below the water outlet end of the return pipe 11. The fountain solution flowing out of the return pipe 11 returns to the filter cloth filter section. The length of the entire filter cloth 13 is greater than the length of the filter cloth filter section.

[0054] When the filtering effect of the filter cloth 13 is not good, the filter cloth 13 is moved so that the remaining part of the filter cloth 13 moves below the water outlet end of the return pipe 11, thereby replacing the filtering section of the filter cloth and ensuring the filtering effect of the filter cloth 13.

[0055] In this embodiment, please refer to Figures 1 to 6 The filter cloth filter section is arranged in a shape that increases the filtering time of the fountain solution return water.

[0056] The filter cloth filtering section is not limited here, mainly to increase the flow time of the fountain solution return water on the filter cloth 13, thereby increasing the filtering time of the fountain solution return water. The shape of the filter cloth filtering section here can be a convex curved surface, a concave curved surface, an inclined straight surface, or an inclined curved surface (the curved surface here can be a convex curved surface or a concave curved surface).

[0057] In this embodiment, please refer to Figures 1 to 6 , the filtering subsystem also includes a detection component for detecting the filtering effect of the filter cloth 13;

[0058] The detection assembly includes a liquid level detector 21 and a plurality of water retaining plates 22;

[0059] A plurality of the water retaining plates 22 and the filter cloth filtering section form a liquid retaining area with an upper opening. The liquid level detector 21 is arranged in the liquid retaining area above the filter cloth filtering section. The liquid level detector 21 controls the movement of the filter cloth 13 according to the liquid level signal.

[0060] When the liquid level detector 21 detects the liquid level data, it means that a certain amount of dampening solution has accumulated in the liquid blocking area, which can provide feedback that the filtering effect of the filter cloth filtering section has deteriorated. At this time, the filter cloth 13 will be started to move, so that the remaining area of ​​the filter cloth 13 is moved to below the water outlet end of the return pipe 11, so that the filter cloth filtering section can be switched, thereby ensuring the filtering effect of the filter cloth 13.

[0061] The two side walls parallel to the moving direction of the filter cloth 13 are the front side wall and the rear side wall respectively;

[0062] The filter cloth filter section is an upward convex curved surface or an inclined straight surface. In one embodiment of the liquid retaining area, a plurality of water retaining plates are divided into a first front baffle, a first rear baffle, a first left baffle, a first right baffle and a first bottom plate. The first front baffle, the first rear baffle, the first left baffle, the first right baffle and the first bottom plate are fixedly connected to form a liquid retaining box with an opening upward. The upper end surface of the first bottom plate corresponds to the shape of the filter cloth filter section. A plurality of first through holes are opened through the first bottom plate. The first front baffle is in contact with the front side wall. The first rear baffle is fitted with the rear side wall, the first left baffle and the first bottom plate are rotatably provided with a first guide roller, the first right baffle and the first bottom plate are rotatably provided with a second guide roller, the filter cloth 13 passes by the first guide roller and fits with the upper end surface of the first bottom plate, and then passes by the second guide roller, and the first front baffle and the first rear baffle can prevent the backwater of the fountain solution on the filter cloth filter section from leaking from the front and rear sides of the filter cloth filter section, ensuring that all the backwater of the fountain solution can be filtered;

[0063] The filter cloth filtering section is a concave curved surface. In another embodiment of the liquid retaining area, the plurality of water retaining plates 22 are divided into a second front retaining plate and a second rear retaining plate. The second front retaining plate is fitted with the front side wall, and the second rear retaining plate is fitted with the rear side wall. The lower end surface of the second front retaining plate and the lower end surface of the second rear retaining plate are both flush with the lowest point of the curved surface or located below the lowest point of the curved surface.

[0064] The filter cloth filtering section is an upward convex curved surface that is inclined. In another embodiment of the liquid retaining area, a plurality of water retaining plates are divided into a third front baffle, a third rear baffle, a second left baffle and a second bottom plate. The third front baffle is fitted with the front side wall of the filter cloth 13, and the third rear baffle is fitted with the rear side wall of the filter cloth 13. The third front baffle, the third rear baffle, the second left baffle and the second bottom plate are fixedly connected to form a liquid retaining box with an opening upward. The upper end surface of the second bottom plate corresponds to the shape of the filter cloth filtering section. A plurality of second through holes are provided on the second bottom plate. A third guide roller is rotatably provided at the intersection of the second left baffle and the second bottom plate. The filter cloth 13 is fitted with the second bottom plate and then bypasses the third guide roller and fits with the second left baffle.

[0065] The filter cloth filtering section is a concave curved surface arranged obliquely. In another embodiment of the liquid retaining area, a plurality of water retaining plates are divided into a fourth front baffle, a fourth rear baffle, a third left baffle, a third bottom plate and a top plate. The fourth front baffle is fitted with the front side wall of the filter cloth 13, and the fourth rear baffle is fitted with the rear side wall of the filter cloth 13. The fourth front baffle, the fourth rear baffle, the third left baffle, the third bottom plate and the top plate are fixedly connected to form a liquid retaining box with an opening upward. The upper end surface of the third bottom plate corresponds to the shape of the filter cloth filtering section. A plurality of third through holes are provided through the third bottom plate and the top plate. A fourth guide roller is rotatably provided at the intersection of the third left baffle and the third bottom plate. The filter cloth filtering section is located between the third bottom plate and the top plate. The filter cloth 13 is fitted with the bottom end surface of the top plate and then bypasses the fourth guide roller and fits with the third left baffle.

[0066] In this embodiment, please refer to Figures 1 to 6 , the filtering subsystem further includes a driving shaft 31 and a driven shaft 32;

[0067] The driving shaft 31 and the driven shaft 32 are both rotatably arranged. Here, the driving shaft 31 and the driven shaft 32 may be both driven to rotate by the motor, or only the driving shaft 31 may be driven to rotate by the motor.

[0068] The rotation axis of the driving shaft 31 is parallel to the rotation axis of the driven shaft 32, one end of the filter cloth 13 is rolled up on the driving shaft 31, and the other end of the filter cloth 13 is rolled up on the driven shaft 32, and the filter section of the filter cloth is located between the driving shaft 31 and the driven shaft 32. When the liquid level detector 21 detects the liquid level data, the driving shaft 31 can be controlled to rotate, so that the filter cloth 13 with poor filtering effect is rolled up onto the driven shaft 32.

[0069] In this embodiment, please refer to Figures 1 to 6 , the filtering subsystem further includes a return water buffer 4 for reducing the pressure of the fountain solution flowing out of the return water pipe 11;

[0070] The water return buffer 4 includes a buffer body 41, a water storage cavity 42 and a water outlet 43;

[0071] A water storage cavity 42 is defined in the buffer body 41 , a water outlet 43 is defined on the buffer body 41 , the water return pipe 11 extends into the water storage cavity 42 , and the extension line of the water outlet end of the water return pipe 11 does not coincide with the water outlet 43 .

[0072] Since the return water of the fountain solution is relatively dirty, if the water pressure is high when filtering through the filter cloth 13, a certain amount of impurities will directly pass through the filter cloth 13 due to the water pressure, which will reduce the filtering effect of the filter cloth 13. Therefore, the return water buffer 4 is needed to reduce the water pressure of the return water of the fountain solution flowing out of the return pipe 11.

[0073] Here, no limitation is imposed between the outlet end of the return pipe 11 and the outlet 43, mainly to prevent the dampening solution flowing out of the outlet end of the return pipe 11 from flowing out directly through the outlet 43, and to reduce the water pressure of the dampening solution returning from the outlet 43. The outlet 43 may be provided at the top of the water storage cavity 42, and the outlet 43 connects the water storage cavity 42 with the external space. The outlet end of the return pipe 11 is inserted downward into the lower part of the water storage cavity 42. After the dampening solution returns from the return pipe 11, it may be decompressed through the bottom end surface of the water storage cavity 42, and then through The water outlet 43 overflows, reducing the water pressure of the fountain solution backwater flowing out of the water outlet 43; the water outlet 43 may also be opened at the upper part of the water storage cavity 42, the water outlet 43 is at a certain distance from the top surface, the water outlet 43 connects the water storage cavity 42 with the external space, the water outlet end of the return pipe 11 extends into the water storage cavity 42 but does not face the water outlet 43, the fountain solution backwater can be decompressed through the bottom end surface of the water storage cavity 42 after flowing out of the return pipe 11, and then overflows through the water outlet 43, reducing the water pressure of the fountain solution backwater flowing out of the water outlet 43;

[0074] At the same time, in order to further reduce the water pressure, a pressure reducing plate may be arranged obliquely in the water storage cavity 42 .

[0075] In this embodiment, please refer to Figures 1 to 6 , the filtering subsystem further comprises a collecting box 51 for collecting the fountain solution after filtering;

[0076] The collecting box 51 is located below the filter cloth filtering section.

[0077] By arranging the collecting box 51 below the filter section of the filter cloth, the fountain solution after filtering can be received, thereby realizing the collection and storage of the fountain solution after filtering.

[0078] See also Figure 7 , a fountain solution circulation system, comprising the above-mentioned filtering subsystem of a printing press, the circulation system further comprising a centralized water supply tank 52, a water inlet pipe 53 and at least two printing presses 12;

[0079] The centralized water supply tank 52 is connected to the collection tank 51;

[0080] The water inlet ends of at least two of the printing machines 12 are connected to the centralized water supply tank 52 through the water inlet pipe 53 .

[0081] Here, the printing press 12 can be a commercial rotary printing press or a sheet-fed offset printing press. Among at least two printing presses 12, some can be commercial rotary printing presses and some can be sheet-fed offset printing presses, or all can be commercial rotary printing presses, or all can be sheet-fed offset printing presses. In a printing system with centralized water supply, since the number of printing presses 12 is large and the amount of fountain solution required is large, a centralized water supply tank 52 can be set up to supply water to all printing presses 12.

[0082] In this embodiment, please refer to Figure 7 , the circulation system further includes a connecting pipe 54 and a first filter 55;

[0083] One end of the connecting pipe 54 is connected to the collecting box 51 , and the other end of the connecting pipe 54 is connected to the centralized water supply box 52 . The first filter 55 is disposed on the connecting pipe 54 .

[0084] By providing the connecting pipe 54 and the first filter 55 , the returned fountain solution can be further filtered when the fountain solution is directed from the collection tank 51 to the centralized water supply tank 52 , thereby further ensuring the cleanliness of the fountain solution in the centralized water supply tank 52 .

[0085] In this embodiment, please refer to Figure 7 , the circulation system further comprises a circulation pipeline 56 and at least one second filter 57;

[0086] Both ends of the circulation pipeline 56 are connected to the centralized water supply tank to form a circulation passage, and the second filter 57 is arranged on the circulation pipeline 56 .

[0087] The provided circulation pipeline 56 and the second filter 57 can continuously filter the fountain solution in the centralized water supply tank, thereby ensuring the cleanliness of the fountain solution in the centralized water supply tank 52 .

[0088] The number of the second filters 57 can be one, two, three, four, etc. By setting the second filters 57, the cleanliness of the fountain solution in the centralized water supply tank can be further ensured.

[0089] In this embodiment, a water pump and a pressure gauge may be provided between the liquid inlet end of the circulation pipeline 56 and the second filter 57 to detect the pressure value of the dampening liquid in the circulation pipeline 56. A flow meter or a flow sensor may be provided between the second filter 57 and the liquid outlet end of the circulation pipeline 56 to monitor the flow of the dampening liquid in the circulation pipeline 56 and detect the filtering effect of the second filter 57.

[0090] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A filtering subsystem of a printing press, characterized in that: The filtering subsystem comprises: A water return pipe, the water inlet end of the water return pipe is connected to the water outlet end of the printing press; The filter cloth is arranged to move, the filter cloth section on the filter cloth that filters the fountain solution flowing out of the return pipe is the filter cloth filter section, the filter cloth filter section is located below the water outlet end of the return pipe, the fountain solution returning from the return pipe falls onto the filter cloth filter section, and the length of the entire filter cloth is greater than the length of the filter cloth filter section.

2. A filter subsystem for a printing press according to claim 1, characterized in that: The filter cloth filtering section is arranged in a shape that increases the filtering time of the fountain solution return water.

3. A filter subsystem for a printing press according to claim 2, characterized in that: The filter cloth filtering section presents an upward convex curved surface; Or the filter cloth filtering section is a concave curved surface; Or the filter cloth filtering section is an inclined straight surface.

4. The filtering subsystem of a printing press according to claim 1, characterized in that: The filtering subsystem also includes a detection component for detecting the filtering effect of the filter cloth; The detection assembly includes a liquid level detector and a plurality of water baffles; A plurality of the water retaining plates and the filter cloth filter section form a liquid retaining area with an upper opening, and the liquid level detector is arranged in the liquid retaining area above the filter cloth filter section; The liquid level detector controls the movement of the filter cloth according to the liquid level signal.

5. The filtering subsystem of a printing press according to claim 1, characterized in that: The filtering subsystem also includes a driving shaft and a driven shaft; The driving shaft and the driven shaft are both rotatably arranged, the rotation axis of the driving shaft is parallel to the rotation axis of the driven shaft, one end of the filter cloth is rolled up on the driving shaft, the other end of the filter cloth is rolled up on the driven shaft, and the filter section of the filter cloth is located between the driving shaft and the driven shaft.

6. The filtering subsystem of a printing press according to claim 1, characterized in that: The filtering subsystem also includes a water return buffer for reducing the pressure of the fountain solution flowing out of the water return pipe; The water return buffer comprises a buffer body, a water storage cavity and a water outlet; A water storage cavity is provided in the buffer body, a water outlet is provided on the buffer body, the return water pipe extends into the water storage cavity, and the extension line of the water outlet end of the return water pipe does not coincide with the water outlet.

7. The filtering subsystem of a printing press according to claim 1, characterized in that: The filtering subsystem also includes a collection box for collecting the fountain solution after filtering; The collecting box is located below the filter cloth filtering section.

8. A fountain solution circulation system, comprising a filtering subsystem of a printing press according to any one of claims 1 to 7, characterized in that: The circulation system also includes a centralized water supply tank, a water inlet pipe and at least two printing presses; The centralized water supply tank is connected to the collection tank; The water inlet ends of at least two of the printing machines are connected to the centralized water supply tank through water inlet pipes.

9. A fountain solution circulation system according to claim 8, characterized in that: The circulation system also includes a connecting pipe and a first filter; One end of the connecting pipe is connected to the collecting box, the other end of the connecting pipe is connected to the centralized water supply box, and the first filter is arranged on the connecting pipe.

10. A fountain solution circulation system according to claim 8, characterized in that: The circulation system further comprises a circulation pipeline and at least one second filter; Both ends of the circulation pipeline are connected to the centralized water supply tank to form a circulation passage, and the second filter is arranged on the circulation pipeline.

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