Self-circulation fountain solution system

Abstract

The utility model relates to a self-circulation fountain solution system which comprises a pipeline assembly, a power pump assembly and a control valve assembly. The pipeline assembly comprises a main path and a branch path, a wastewater collecting tank, a first temporary storage tank, a first filtering assembly, a UV photocatalyst ceramic core water treater, a quality control device and a storage tank are sequentially arranged on the main path, the first end of the branch path is connected with the quality control device, and the first end of the branch path is connected with the main path and located between the first temporary storage tank and the first filtering assembly; and a second filtering assembly and a second temporary storage box are sequentially arranged on the branch. The control valve assembly is arranged on the pipeline assembly, and the control valve assembly is configured to control on-off of the pipeline assembly. According to the fountain solution filtering device, the untreated fountain solution is stored in the first temporary storage box, and the treated fountain solution which does not meet the standard flows through the second filtering assembly and the first filtering assembly through the branch to be circularly filtered until the fountain solution meets the standard, so that the filtering precision is improved, the quality of the fountain solution is further improved, and the cyclic utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of printing, in particular to a self-circulating fountain solution system. Background Art

[0002] With the development of the economy, the effective use of energy and the reduction and prevention of environmental pollution have become an important task in business operations, and people's awareness of environmental protection is also increasing.

[0003] The printing industry, as a whole, traditionally produces a significant amount of wastewater during printing processes. The dampening water used in offset printing contains chemicals such as isopropyl alcohol and ink, which can cause environmental pollution. Reducing wastewater discharge and chemical use will benefit the environment while also lowering production costs.

[0004] The fountain solution filtration system disclosed in the prior art usually reuses the treated fountain solution after coarse filtration and fine filtration. However, the filtration accuracy is not high, and the fountain solution treated by the filtration system is not completely filtered, resulting in the presence of fine impurities such as ink residue, paper powder, detergent and other chemical additives in the filtered fountain solution, affecting subsequent use. Utility Model Content

[0005] The purpose of the utility model is to provide a self-circulating fountain solution system, which aims to solve the technical problem that the existing fountain solution filtering system has low filtering accuracy, which affects the subsequent use of the fountain solution.

[0006] In order to solve the above technical problems, a self-circulating fountain solution system is provided, comprising:

[0007] A pipeline assembly includes a main line and a branch line, wherein the main line is sequentially provided with a wastewater collection tank, a first temporary storage tank, a first filter assembly, a UV photocatalyst ceramic core water treatment device, a quality control device, and a storage box; a first end of the branch line is connected to the quality control device; a first end of the branch line is connected to the main line and is located between the first temporary storage tank and the first filter assembly; a second filter assembly and a second temporary storage tank are sequentially provided on the branch line;

[0008] A power pump assembly, comprising a first power pump and a second power pump for providing power, wherein the first power pump is arranged on the main road, and the second power pump is arranged on the branch road;

[0009] A control valve assembly is arranged on the pipeline assembly, and the control valve assembly is configured to control the on and off of the pipeline assembly. The control valve assembly includes a first control valve, a second control valve and a third control valve. The first control valve is arranged on the main line and is located between the first temporary storage box and the first filter assembly. The second control valve is arranged on the main line and is located between the quality control device and the storage box. The third control valve is arranged on the branch line and is located between the quality control device and the second filter assembly.

[0010] Furthermore, the self-circulating dampening fluid system also includes a water level sensor assembly arranged in the first temporary storage tank, and the water level sensor assembly is used to obtain water level information of the first temporary storage tank; the control valve assembly also includes a fourth control valve, and the fourth control valve is arranged on the branch road and located between the second temporary storage tank and the main road. The first control valve and the fourth control valve adjust the on-off of the pipeline according to the water level information.

[0011] Furthermore, the water level sensor assembly includes a first water level sensor and a second water level sensor, and the setting position of the first water level sensor is lower than the setting position of the second water level sensor.

[0012] Furthermore, the self-circulating fountain solution system also includes a one-way valve assembly, which includes a first one-way valve and a second one-way valve. The first one-way valve is arranged on the main line and is located between the first filter assembly and the UV photocatalyst ceramic core water processor. The second one-way valve is arranged on the branch line and is located between the second temporary storage box and the second filter assembly.

[0013] Furthermore, the one-way valve assembly further includes a third one-way valve, which is arranged in the main path and located between the wastewater collection tank and the first power pump.

[0014] Furthermore, the self-circulating fountain solution system further includes a cyclone separator, which is arranged on the main road and located between the first power pump and the first temporary storage tank.

[0015] Furthermore, the power pump assembly also includes a third power pump and a fourth power pump. The third power pump is arranged on the main road and located between the second control valve and the quality control device. The fourth power pump is arranged on the branch road and located between the second temporary storage box and the main road.

[0016] Furthermore, the first filter assembly and the second filter assembly each include a preliminary filter, a hollow fiber membrane filter, and a ceramic membrane filter, which are sequentially arranged along the flow direction of the fountain solution.

[0017] Furthermore, the quality control device includes a controller, and an automatic surface tension detector, an automatic conductivity detector, an automatic pH detector and an automatic regulator electrically connected to the controller respectively, and the branch is connected to the automatic regulator.

[0018] Furthermore, the quality control device also includes a fourth one-way valve, and the fourth one-way valve is arranged between the controller and the automatic regulator.

[0019] The implementation of the present invention will have the following beneficial effects:

[0020] The self-circulating fountain solution system in this embodiment is provided with a first control valve, a second control valve, a quality control device and a branch. The quality control device is used to detect whether the filtered fountain solution meets the standards. If it does not meet the standards, the first control valve and the second control valve will be closed first, and the third control valve will be opened. At this time, the untreated fountain solution will be stored in the first temporary storage box, and the treated fountain solution that does not meet the standards will flow through the second filter component through the branch, and then be circulated and filtered through the first filter component until it meets the standards. The second control valve will be opened, and the fountain solution that meets the standards will be transferred to the printing press water tank for recycling, thereby achieving the purpose of improving the filtration accuracy, which is beneficial to further improve the quality of the fountain solution and increase the recycling rate. On the other hand, by setting up the first temporary storage box and the second temporary storage box, the fountain solution in the main path and the branch path can be flexibly controlled. If the fountain solution in the first temporary storage box is almost full, the fountain solution in the first temporary storage box will be processed first through system control, and vice versa. The system or the user can flexibly control according to the situation to avoid excessive fountain solution in the first temporary storage box or the second temporary storage box causing the filtration system to be unusable, thereby affecting the use of the printing press. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of the self-circulating fountain solution system according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the self-circulating fountain solution system according to the embodiment of the utility model. Figure 2 ;

[0024] Figure 3This is a schematic structural diagram of the quality control device described in an embodiment of the present utility model.

[0025] Among them: 100, self-circulating fountain solution system; 110, pipeline assembly; 111, main line; 112, branch line; 120, power pump assembly; 121, first power pump; 122, second power pump; 123, third power pump; 124, fourth power pump; 130, control valve assembly; 131, first control valve; 132, second control valve; 133, third control valve; 134, fourth control valve; 140, wastewater collection box; 150, first temporary storage box; 160, first filter assembly; 161, preliminary filter; 162, hollow fiber membrane filter; 163, ceramic membrane filter; 17 0. UV photocatalyst ceramic core water treatment device; 180. Quality control device; 181. Controller; 182. Automatic surface tension detector; 183. Automatic conductivity detector; 184. Automatic pH detector; 185. Automatic regulator; 186. Fourth one-way valve; 190. Storage box; 200. Second filter assembly; 210. Second temporary storage box; 220. Water level sensor assembly; 221. First water level sensor; 222. Second water level sensor; 230. One-way valve assembly; 231. First one-way valve; 232. Second one-way valve; 233. Third one-way valve; 240. Cyclone separator. DETAILED DESCRIPTION

[0026] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Please refer to Figure 1-Figure 3The present invention provides a self-circulating fountain solution system 100, comprising a piping assembly 110, a power pump assembly 120, and a control valve assembly 130. The piping assembly 110 includes a main line 111 and a branch line 112. The main line 111 is sequentially provided with a wastewater collection tank 140, a first temporary storage tank 150, a first filter assembly 160, a UV photocatalyst ceramic core water treatment unit 170, a quality control device 180, and a storage tank 190. The first end of the branch line 112 is connected to the quality control device 180. The first end of the branch line 112 is connected to the main line 111 and is located between the first temporary storage tank 150 and the first filter assembly 160. A second filter assembly 200 and a second temporary storage tank 210 are sequentially provided on the branch line 112. The power pump assembly 120 includes a first power pump 121 and a second power pump 122 for providing power. The first power pump 121 is provided on the main line 111, and the second power pump 122 is provided on the branch line 112. The control valve assembly 130 is arranged on the pipeline assembly 110. The control valve assembly 130 is configured to control the on and off of the pipeline assembly 110. The control valve assembly 130 includes a first control valve 131, a second control valve 132 and a third control valve 133. The first control valve 131 is arranged on the main road 111 and is located between the first temporary storage box 150 and the first filter assembly 160. The second control valve 132 is arranged on the main road 111 and is located between the quality control device 180 and the storage box 190. The third control valve 133 is arranged on the branch road 112 and is located between the quality control device 180 and the second filter assembly 200. For example, the used fountain solution is initially filtered out of impurities by the first filter assembly 160 in the main path 111. After being filtered by the first filter assembly 160, if the quality control device 180 detects that the fountain solution is of unqualified quality, the fountain solution is sequentially transported through the branch path 112 to the second filter assembly 200 and the first filter assembly 160 for secondary filtration. The solution then flows back to the quality control device 180 for testing. If the solution fails the test, the above steps are repeated, and the solution flows again to the second filter assembly 200 and the first filter assembly 160 for filtration. If the solution passes the test, the solution flows into the storage box 190 for storage and use by the printing press. In other words, the innovation of the system of the present application is that the system first uses the first filter assembly 160 to process the used fountain solution. If the first filter assembly 160 alone does not achieve the desired filtering effect, the system uses the first filter assembly 160 and the second filter assembly 200 in combination to improve the filtering effect of the fountain solution. It is understandable that the first filter assembly 160 and the second filter assembly 200 may be the same or different.For example, as an embodiment, the filtering accuracy of the second filter component 200 is set to be higher than the filtering accuracy of the first filter component 160. It is understandable that the cost of the second filter component 200 will be higher than that of the first filter component 160. Therefore, the system of the present application first uses the first filter component 160 for processing, and only uses the first filter component 160 and the second filter component 200 for processing together if it does not work, thereby reducing the frequency of use of the second filter component 200, thereby achieving the purpose of extending the service life of the second filter component 200.

[0030] Please refer to Figure 1 、 Figure 2 and Figure 3 In the self-circulating fountain solution system 100 of this embodiment, the first control valve 131, the second control valve 132, the quality control device 180 and the branch 112 are provided. The quality control device 180 is used to detect whether the filtered fountain solution meets the standards. If it does not meet the standards, the first control valve 131 and the second control valve 132 will be closed and the third control valve 133 will be opened. At this time, the untreated fountain solution will be stored in the first temporary storage tank 150, while the treated fountain solution that does not meet the standards will flow through the second filter component 200 through the branch 112 and then be circulated and filtered through the first filter component 160 until it meets the standards. At this time, the second control valve 132 will be opened, and the fountain solution that meets the standards will be transferred to the printing press water tank for recycling, thereby achieving the purpose of improving the filtration accuracy, which is beneficial to further improve the quality of the fountain solution and increase the recycling rate. On the other hand, by setting up the first temporary storage box 150 and the second temporary storage box 210, the fountain solution in the main path 111 and the branch path 112 can be flexibly controlled. If the fountain solution in the first temporary storage box 150 is almost full, the fountain solution in the first temporary storage box 150 will be processed first through system control, and vice versa. The system or the user can flexibly control according to the situation to avoid excessive fountain solution in the first temporary storage box 150 or the second temporary storage box 210 causing the filtration system to be unusable, thereby affecting the use of the printing press.

[0031] Please refer to Figure 1 、 Figure 2 and Figure 3 In one possible embodiment, the self-circulating fountain solution system 100 further includes a water level sensor assembly 220 disposed in the first temporary storage tank 150, and the water level sensor assembly 220 is used to obtain water level information of the first temporary storage tank 150; the control valve assembly 130 further includes a fourth control valve 134, and the fourth control valve 134 is disposed on the branch 112 and located between the second temporary storage tank 210 and the main road 111. The first control valve 131 and the fourth control valve 134 adjust the on-off state of the pipeline according to the water level information.

[0032] Please refer to Figure 1 、 Figure 2 and Figure 3 In one possible embodiment, the water level sensor assembly 220 includes a first water level sensor 221 and a second water level sensor 222, and the first water level sensor 221 is positioned lower than the second water level sensor 222. For example, the first water level sensor 221 is positioned lower than the second water level sensor 222, meaning that the first water level sensor 221 is triggered first and the second water level sensor 222 is triggered later. Specifically, in this embodiment, the triggering time of the first water level sensor 221 is set to when the storage amount of the dampening solution in the first temporary storage box 150 has reached the first preset threshold value. When the storage amount of the dampening solution reaches the first preset threshold value, the dampening solution in the first temporary storage box 150 is close to reaching more than three-quarters of the total capacity of the first temporary storage box 150, but it can still be used continuously for a period of time. At this time, if there is also dampening solution in the second temporary storage box 210, the system will give the user an alarm message. At this time, the user can choose to process the dampening solution in the first temporary storage box 150 first, or choose to process the dampening solution in the second temporary storage box 210 first. However, when the second water level sensor 222 is triggered, the triggering time of the second water level sensor 222 is set to occur when the amount of dampening solution stored in the first temporary storage tank 150 has reached a second preset threshold. When the amount of dampening solution reaches the second preset threshold, the amount of dampening solution in the first temporary storage tank 150 is close to reaching more than nine-tenths of the total capacity of the first temporary storage tank 150. At this point, the system automatically prioritizes the dampening solution in the first temporary storage tank 150. In other words, under normal circumstances, the system of the present application prioritizes the dampening solution in the second temporary storage tank 210, while in emergencies, the dampening solution in the first temporary storage tank 150 is prioritized. In specific applications, the values ​​of the first and second preset thresholds can be set based on actual circumstances, and are not limited herein. For example, as another embodiment, the first preset threshold can be set to three-fifths of the total capacity of the first temporary storage tank 150, and the second preset threshold can be set to four-fifths of the total capacity of the first temporary storage tank 150.

[0033] Please refer to Figure 1 、 Figure 2 and Figure 3 Specifically, when processing the fountain solution in the first temporary storage tank 150, the first control valve 131 is opened, the fourth control valve 134 is closed, and the first power pump 121 is started. When processing the fountain solution in the second temporary storage tank 210, the first control valve 131 is closed, the fourth control valve 134 is opened, and the fourth power pump 124 is started.

[0034] Please refer to Figure 1 、 Figure 2 and Figure 3In one possible embodiment, self-circulating fountain solution system 100 further includes a one-way valve assembly 230, which includes a first one-way valve 231 and a second one-way valve 232. First one-way valve 231 is disposed on main path 111 between first filter assembly 160 and UV photocatalyst ceramic core water treatment unit 170. Second one-way valve 232 is disposed on branch path 112 between second temporary storage tank 210 and second filter assembly 200. Exemplarily, each one-way valve in one-way valve assembly 230 is intended to prevent backflow of fountain solution.

[0035] Please refer to Figure 1 、 Figure 2 and Figure 3 In a possible implementation, the one-way valve assembly 230 further includes a third one-way valve 233 . The third one-way valve 233 is disposed in the main path 111 and is located between the wastewater collection tank 140 and the first power pump 121 .

[0036] Please refer to Figure 1 、 Figure 2 and Figure 3 In one possible embodiment, the self-circulating fountain solution system 100 further includes a cyclone separator 240, which is disposed on the main path 111 and located between the first power pump 121 and the first temporary storage tank 150. For example, the top of the cyclone separator 240 is a separation outlet, and the bottom of the cyclone separator 240 is connected to the first filter assembly 160 via a pipe. The cyclone separator 240 in this embodiment is commercially available and has a centrifugal speed of 3.5 to 5 m / s.

[0037] Please refer to Figure 1 、 Figure 2 and Figure 3 In a possible embodiment, the power pump assembly 120 also includes a third power pump 123 and a fourth power pump 124. The third power pump 123 is arranged on the main road 111 and is located between the second control valve 132 and the quality control device 180. The fourth power pump 124 is arranged on the branch road 112 and is located between the second temporary storage box 210 and the main road 111.

[0038] Please refer to Figure 1 、 Figure 2 and Figure 3In one possible embodiment, both the first filter assembly 160 and the second filter assembly 200 include a primary filter 161, a hollow fiber membrane filter 162, and a ceramic membrane filter 163, arranged sequentially along the flow direction of the fountain solution. For example, the fountain solution is filtered through the primary filter 161, the hollow fiber membrane filter 162, and the ceramic membrane filter 163 to remove ink residue, paper dust, paper scraps, and oil contamination from the fountain solution. In one embodiment, the first filter assembly 160 and the second filter assembly 200 have the same structure.

[0039] Please refer to Figure 1 、 Figure 2 and Figure 3 In one possible embodiment, quality control device 180 includes a controller 181, and an automatic surface tension detector 182, an automatic conductivity detector 183, an automatic pH detector 184, and an automatic regulator 185, each electrically connected to controller 181. Branch 112 is connected to automatic regulator 185. For example, automatic surface tension detector 182 is a surface tension meter manufactured by KRUSS in Germany, the automatic conductivity detector is manufactured by Hach in the United States, and the automatic pH detector 184 is manufactured by Lian Test. Controller 181 is a PLC controller 181 with a built-in control program. Controller 181 functions for logical judgment and control, meeting the requirements of this embodiment. In this embodiment, automatic regulator 185 is a water pump. The pH, conductivity and surface tension are tested in the quality control device 180, and the test results are fed back to the controller 181. The controller 181 controls the fountain solution automatic regulator 185 to add corresponding additives. When the three parameters of the fountain solution meet the conductivity of 800-1200μs / cm, pH value of 4.5-5.5, and surface tension of 0.04-0.07N / m.

[0040] Please refer to Figure 1 、 Figure 2 and Figure 3 In a possible implementation, the quality control device 180 further includes a fourth one-way valve 186 , which is disposed between the controller 181 and the automatic regulator 185 .

[0041] Please refer to Figure 1 、 Figure 2 and Figure 3 , the use process of the self-circulating fountain solution system 100:

[0042] The used fountain solution flows into the wastewater collection tank 140, and the first power pump 121 is started. The fountain solution in the wastewater collection tank 140 flows into the cyclone separator 240. At this time, large particles of foreign matter in the fountain solution are discharged through the separation outlet, and the rest flows into the first temporary storage tank 150. The first control valve 131 is opened, and the fountain solution in the intermediate temporary storage tank flows into the first filter component 160 for filtration treatment. Thereafter, it flows through the UV photocatalyst ceramic core water treatment device 170 for sterilization and disinfection treatment, and then enters the quality control device 180. The quality control device 180 determines whether the treated fountain solution is qualified. If the fountain solution is qualified, the third control valve 133 and the second power pump 122 are closed, the second control valve 132 is opened, and the third power pump 123 is started. The treated fountain solution flows into the storage tank 190 for recycling by the printing press. If the fountain solution fails the test, the first control valve 131, the second control valve 132, and the third power pump 123 are closed, the third control valve 133 and the fourth control valve 134 are opened, and the second power pump 122 and the fourth power pump 124 are started. The fountain solution in the quality control device 180 flows through the branch line 112 to the second filter assembly 200, the second temporary storage tank 210, and the first filter assembly 160 in sequence, where it is circulated until the fountain solution passes the test, thereby improving the quality of the fountain solution. At this point, the fountain solution used by the printing press is stored in the intermediate temporary storage tank. Furthermore, under normal circumstances, if the fountain solution after the first filtration by the first filter assembly 160 fails the first filtration, the unqualified fountain solution is prioritized. The fountain solution in the first temporary storage tank 150 is prioritized in two situations: the first is when the first water level sensor 221 is triggered and the user selects priority processing of the fountain solution in the first temporary storage tank 150; the second is when the second water level sensor 222 is triggered.

[0043] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A self-circulating fountain solution system, characterized in that: include: A pipeline assembly includes a main line and a branch line, wherein the main line is sequentially provided with a wastewater collection tank, a first temporary storage tank, a first filter assembly, a UV photocatalyst ceramic core water treatment device, a quality control device, and a storage box; a first end of the branch line is connected to the quality control device; a first end of the branch line is connected to the main line and is located between the first temporary storage tank and the first filter assembly; a second filter assembly and a second temporary storage tank are sequentially provided on the branch line; A power pump assembly, comprising a first power pump and a second power pump for providing power, wherein the first power pump is arranged on the main road, and the second power pump is arranged on the branch road; A control valve assembly is arranged on the pipeline assembly, and the control valve assembly is configured to control the on and off of the pipeline assembly. The control valve assembly includes a first control valve, a second control valve and a third control valve. The first control valve is arranged on the main line and is located between the first temporary storage box and the first filter assembly. The second control valve is arranged on the main line and is located between the quality control device and the storage box. The third control valve is arranged on the branch line and is located between the quality control device and the second filter assembly.

2. The self-circulating fountain solution system according to claim 1, characterized in that: The self-circulating fountain solution system also includes a water level sensor assembly arranged in the first temporary storage tank, and the water level sensor assembly is used to obtain water level information of the first temporary storage tank; the control valve assembly also includes a fourth control valve, and the fourth control valve is arranged on the branch road and located between the second temporary storage tank and the main road. The first control valve and the fourth control valve adjust the on-off of the pipeline according to the water level information.

3. The self-circulating fountain solution system according to claim 2, characterized in that: The water level sensor assembly includes a first water level sensor and a second water level sensor, and the first water level sensor is arranged at a position lower than the second water level sensor.

4. The self-circulating fountain solution system according to claim 1, characterized in that: The self-circulating fountain solution system also includes a one-way valve assembly, which includes a first one-way valve and a second one-way valve. The first one-way valve is arranged on the main line and is located between the first filter assembly and the UV photocatalyst ceramic core water processor. The second one-way valve is arranged on the branch line and is located between the second temporary storage box and the second filter assembly.

5. The self-circulating fountain solution system according to claim 4, characterized in that: The one-way valve assembly further includes a third one-way valve, which is disposed in the main path and located between the wastewater collection tank and the first power pump.

6. The self-circulating fountain solution system according to claim 1, characterized in that: The self-circulating fountain solution system further includes a cyclone separator, which is arranged on the main road and located between the first power pump and the first temporary storage box.

7. The self-circulating fountain solution system according to claim 1, characterized in that: The power pump assembly also includes a third power pump and a fourth power pump. The third power pump is arranged on the main road and located between the second control valve and the quality control device. The fourth power pump is arranged on the branch road and located between the second temporary storage box and the main road.

8. The self-circulating fountain solution system according to claim 1, characterized in that: The first filter assembly and the second filter assembly both include a preliminary filter, a hollow fiber membrane filter, and a ceramic membrane filter, which are sequentially arranged along the flow direction of the fountain solution.

9. The self-circulating fountain solution system according to claim 1, characterized in that: The quality control device includes a controller, and an automatic surface tension detector, an automatic conductivity detector, an automatic pH detector and an automatic regulator electrically connected to the controller respectively, and the branch is connected to the automatic regulator.

10. The self-circulating fountain solution system according to claim 9, characterized in that: The quality control device further includes a fourth one-way valve, which is arranged between the controller and the automatic regulator.

Images