A coating line pretreatment intelligent water-saving system

Abstract

The application discloses a kind of coating line pretreatment intelligent water-saving system, first pure water direct spray, second pure water direct spray and the pipeline of pure water device are respectively equipped with electric flow valve, first pure water wash, third pure water wash main spray pipe is respectively installed with electric conductivity sensor and electric conductivity control module to detect the electric conductivity of pure water in first pure water wash, third pure water wash main spray pipe, first pure water wash electric conductivity control module controls first pure water direct spray electric flow valve opening and closing, and third pure water wash electric conductivity control module controls second pure water direct spray electric flow valve opening and closing.According to the size of the electric conductivity of pure water of first pure water wash and third pure water wash, the size of the flow of first pure water direct spray and second pure water direct spray and opening and closing are adjusted, to realize automatic detection of pure water electric conductivity and automatic adjustment of water consumption, while normal production, not only can reduce artificial workload and work intensity, but also can reduce waste of water resources, protect environment, it is not only economic but also scientific and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and more specifically to an intelligent water-saving system for pretreatment of coating lines. Background Technology

[0002] In existing pretreatment technologies for coating lines, the first and second pure water direct injection systems directly control the pure water volume using ball valves. After being sprayed, the pure water flows back to the first and third pure water rinsing tanks to reduce their conductivity. When the ball valves for the first and second pure water direct injection systems are opened too wide, the sprayed pure water flow is too small, leading to increased conductivity in these tanks and resulting in incomplete cleaning of workpieces and defective products. Conversely, when the ball valves are opened too wide, the sprayed pure water flow is too large, causing overflow in the tanks and wasting water resources. This also increases the load on the pure water system, requiring continuous addition of purification materials such as chemicals, activated carbon, and reverse osmosis membranes, resulting in higher investment and maintenance costs.

[0003] The factory mostly uses manual, periodic testing to check the conductivity of the pure water in the first and third pure water washing tanks. This method has blind spots. First, the conductivity of the pure water in the first and third washing tanks is measured within a certain range, which is prone to measurement errors. Second, the testing is not continuous, while the pure water in the first and third washing tanks circulates constantly, introducing inherent limitations. This method requires periodic manual operation, which is neither economical nor scientifically sound. Summary of the Invention

[0004] This invention primarily addresses the problem that existing methods for manually detecting the conductivity of pure water in the first and third pure water washing tanks are neither economical nor scientific. It provides an intelligent water-saving system for pretreatment in coating lines. This system automatically adjusts the flow rate and operation of the first and second pure water direct injection systems based on the conductivity of the pure water in the first and third pure water washing tanks. This achieves automatic detection of pure water conductivity and automatic water consumption regulation. While maintaining normal production, it not only reduces manual workload and intensity but also minimizes water waste and protects the environment, making it both economical and environmentally friendly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A smart water-saving pretreatment system for a coating line is disclosed. The workpiece to be coated is processed in the following sequence: pre-degreasing, main degreasing, first water wash, first pure water wash, first pure water direct spray, silane oxidation, second pure water wash, third pure water wash, and second pure water direct spray. Electric flow valves are installed on the pipelines of the first and second pure water direct sprays and the pure water device. Conductivity sensors and conductivity control modules are installed on the main spray pipes of the first and third pure water washes to detect the conductivity of the pure water in the main spray pipes of the first and third pure water washes. The conductivity control module of the first pure water wash controls the opening and closing of the electric flow valve of the first pure water direct spray, and the conductivity control module of the third pure water wash controls the opening and closing of the electric flow valve of the second pure water direct spray. This invention provides an intelligent water-saving system for pretreatment in a coating line, which adds an electric flow valve, a conductivity sensor, and a conductivity control module. The conductivity sensor is used to automatically detect the conductivity of the pure water in the first and third pure water washes at all times. The conductivity control module controls the flow rate and opening / closing of the electric flow valve based on the detected pure water conductivity. This invention adjusts the flow rate and opening / closing of the first and second pure water direct sprays based on the automatic detection of the pure water conductivity in the first and third pure water wash tanks, achieving automatic detection of pure water conductivity and automatic adjustment of water consumption. While maintaining normal production, it not only reduces manual workload and labor intensity but also reduces water waste and protects the environment, making it both economical and scientifically sound.

[0007] Preferably, when the conductivity of the first pure water wash reaches a preset low value, the first pure water direct injection electric flow valve is closed; when the conductivity of the first pure water wash reaches a preset high value, the first pure water direct injection electric flow valve is opened. The flow rate and opening / closing of the first pure water direct injection are adjusted based on the automatically detected conductivity of the first pure water wash.

[0008] Preferably, when the conductivity of the third pure water wash reaches a preset low value, the second pure water direct injection electric flow valve closes; when the conductivity of the third pure water wash reaches a preset high value, the second pure water direct injection electric flow valve opens. The flow rate and opening / closing of the second pure water direct injection valve are adjusted based on the automatically detected conductivity of the third pure water wash.

[0009] Preferably, the first pure water direct injection electric flow valve is connected in series in the first pure water direct injection main spray pipe; the second pure water direct injection electric flow valve is connected in series in the second pure water direct injection main spray pipe. The electric flow valves are used to control the water consumption of the first and second pure water direct injection systems.

[0010] Preferably, the first pure water wash conductivity sensor is connected to the first pure water wash conductivity control module via a first pure water wash feedback signal line; the third pure water wash conductivity sensor is connected to the third pure water wash conductivity control module via a third pure water wash feedback signal line. The conductivity sensors feed back the detected pure water conductivity to the conductivity control module. By installing conductivity sensors on the main spray pipes of the first and third pure water washes, the water quality is constantly monitored, eliminating any blind spots.

[0011] Preferably, the first pure water wash conductivity control module controls the conductivity detection range and is connected to the first pure water direct injection electric flow valve via the first pure water direct injection signal line, controlling the flow rate and opening / closing of the first pure water direct injection electric flow valve. Similarly, the third pure water wash conductivity control module controls the conductivity detection range and is connected to the second pure water direct injection electric flow valve via the second pure water direct injection signal line, controlling the flow rate and opening / closing of the second pure water direct injection electric flow valve. The water consumption of the first and second pure water direct injections is controlled by the conductivity of the first and third pure water washes, and the conductivity of the first and third pure water washes is constantly monitored, reducing the defect rate of workpieces and significantly saving water consumption in the pretreatment of the coating line. The entire system has a simple structure, and the automatic water replenishment process is completed through the conductivity control module, eliminating the need for on-site personnel operation and reducing a significant amount of manual labor.

[0012] Preferably, when the first pure water direct injection electric flow valve is opened, the sprayed pure water flows through the bottom plate of the first pure water direct injection shed to the first pure water washing tank; when the second pure water direct injection electric flow valve is opened, the sprayed pure water flows through the bottom plate of the second pure water direct injection shed to the third pure water washing tank.

[0013] Preferably, the first pure water direct injection electric flow valve is connected in series with a first ball valve, a second ball valve, and a third ball valve, respectively, and then connected in parallel to the first pure water direct injection pipeline. Similarly, the second pure water direct injection electric flow valve is connected in series with a fourth ball valve, a fifth ball valve, and a sixth ball valve, respectively, and then connected in parallel to the second pure water direct injection pipeline. When the electric flow valves for the first and second pure water direct injection systems need to be replaced or repaired, a bypass valve can be opened, which is convenient and practical without affecting production.

[0014] Preferably, the first pure water wash conductivity sensor is connected in series with a seventh ball valve and an eighth ball valve, and in parallel with a ninth ball valve on the first pure water wash pipeline; the third pure water wash conductivity sensor is connected in series with a tenth ball valve and an eleventh ball valve, and in parallel with a twelfth ball valve on the third pure water wash pipeline. When the conductivity sensors of the first and third pure water washes need to be replaced or repaired, the bypass valve can be opened, which does not affect production and is convenient and practical.

[0015] Preferably, the pure water used in the first pure water wash, the first pure water direct spray, the second pure water wash, the third pure water wash, and the second pure water direct spray is all supplied by a pure water device.

[0016] Therefore, the advantages of the present invention are:

[0017] (1) The pure water flow rate and opening / closing of the first pure water direct injection and the second pure water direct injection are adjusted according to the pure water conductivity of the first pure water wash and the third pure water wash, so as to realize the automatic detection of pure water conductivity and automatic adjustment of water consumption. While in normal production, it can not only reduce the amount of manual labor and work intensity, but also reduce the waste of water resources and protect the environment. It is both economical and scientifically environmentally friendly.

[0018] (2) The conductivity sensor enables automatic detection of the conductivity of pure water at all times, eliminating blind spots and reducing the defect rate of workpieces; the conductivity control module completes the automatic water replenishment process without the need for on-site operation, reducing a large amount of manual work.

[0019] (3) The entire system has a simple structure and is practical. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pretreatment process for the coating line in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of an intelligent water-saving system for pretreatment of a coating line according to an embodiment of the present invention.

[0022] 1. First pure water direct spray main spray pipe; 2. Pure water device pipeline; 3. First pure water direct spray electric flow valve; 4. Second pure water direct spray main spray pipe; 5. Second pure water direct spray electric flow valve; 6. First pure water wash main spray pipe; 7. First pure water wash conductivity control module; 8. Third pure water wash main spray pipe; 9. Third pure water wash conductivity control module; 10. First pure water direct spray signal line; 11. Second pure water direct spray signal line; 12. First pure water direct spray canopy base plate; 13. First pure water wash tank; 14. Second pure water direct spray canopy base plate; 15. Third pure water wash tank; 16. First pure water wash... 17. Conductivity sensor; 18. First pure water wash feedback signal line; 19. Third pure water wash conductivity sensor; 20. Third pure water wash feedback signal line; 21. First ball valve; 22. Second ball valve; 23. Third ball valve; 24. First pure water direct injection pipeline; 25. Fourth ball valve; 26. Fifth ball valve; 27. Sixth ball valve; 28. Second pure water direct injection pipeline; 29. ​​Seventh ball valve; 30. Eighth ball valve; 31. Ninth ball valve; 32. First pure water wash pipeline; 33. Tenth ball valve; 34. Eleventh ball valve; 35. Twelfth ball valve; 36. Third pure water wash pipeline; 37. Pure water device. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, the workpiece to be coated is processed in the following order: pre-degreasing, main degreasing, first water wash, first pure water wash, first pure water direct spray, silane oxidation, second pure water wash, third pure water wash, and second pure water direct spray. The pure water used in the first pure water wash, first pure water direct spray, second pure water wash, third pure water wash, and second pure water direct spray is provided by the pure water device 36.

[0025] like Figure 2 As shown, a first pure water direct spray electric flow valve 3 is installed on the first pure water direct spray main spray pipe 1 and the pure water device pipeline 2; a second pure water direct spray electric flow valve 5 is installed on the second pure water direct spray main spray pipe 4 and the pure water device pipeline 2; a first pure water washing conductivity sensor 16 and a first pure water washing conductivity control module 7 are installed on the first pure water washing main spray pipe 6 to detect the conductivity of pure water in the first pure water washing main spray pipe 6; and a third pure water washing conductivity sensor 18 and a third pure water washing conductivity control module 9 are installed on the third pure water washing main spray pipe 8 to detect the conductivity of pure water in the third pure water washing main spray pipe 8. The conductivity of the internal pure water is controlled by the first pure water wash conductivity control module 7, which controls the opening and closing of the first pure water direct injection electric flow valve 3, and the third pure water wash conductivity control module 9, which controls the opening and closing of the second pure water direct injection electric flow valve 5. When the conductivity of the first pure water wash reaches a preset low value, the first pure water direct injection electric flow valve 3 is closed; when the conductivity of the first pure water wash reaches a preset high value, the first pure water direct injection electric flow valve 3 is opened. When the conductivity of the third pure water wash reaches a preset low value, the second pure water direct injection electric flow valve 5 is closed; when the conductivity of the third pure water wash reaches a preset high value, the second pure water direct injection electric flow valve 5 is opened.

[0026] The first pure water direct injection electric flow valve 3 is connected in series in the first pure water direct injection main spray pipe 1; the second pure water direct injection electric flow valve 5 is connected in series in the second pure water direct injection main spray pipe 4; for the debugging and maintenance of the first pure water direct injection electric flow valve 3 and the second pure water direct injection electric flow valve 5, the first ball valve 20 and the second ball valve 21 are connected in series at both ends of the first pure water direct injection electric flow valve 3 and the third ball valve 22 are connected in parallel to the first pure water direct injection pipeline 23, and the fourth ball valve 24 and the fifth ball valve 25 and the sixth ball valve 26 are connected in series at both ends of the second pure water direct injection electric flow valve 5 and the sixth ball valve 26 are connected in parallel to the second pure water direct injection pipeline 27.

[0027] The first pure water wash conductivity sensor 16 is connected to the first pure water wash conductivity control module 7 via the first pure water wash feedback signal line 17; the third pure water wash conductivity sensor 18 is connected to the third pure water wash conductivity control module 9 via the third pure water wash feedback signal line 19; for the debugging and maintenance of the first pure water wash conductivity sensor 16 and the third pure water wash conductivity sensor 18, the seventh ball valve 28 and the eighth ball valve 29 are connected in series at both ends of the first pure water wash conductivity sensor 16 and the ninth ball valve 30 are connected in parallel to the first pure water wash pipeline 31, and the tenth ball valve 32 and the eleventh ball valve 33 are connected in series at both ends of the third pure water wash conductivity sensor 18 and the twelfth ball valve 34 are connected in parallel to the third pure water wash pipeline 35.

[0028] The first pure water wash conductivity control module 7 controls the conductivity detection range and is connected to the first pure water direct injection electric flow valve 3 via the first pure water direct injection signal line 10, thereby controlling the flow rate and opening / closing of the first pure water direct injection electric flow valve 3; the third pure water wash conductivity control module 9 controls the conductivity detection range and is connected to the second pure water direct injection electric flow valve 5 via the second pure water direct injection signal line 11, thereby controlling the flow rate and opening / closing of the second pure water direct injection electric flow valve 5.

[0029] When the first pure water direct injection electric flow valve 3 is opened, the sprayed pure water flows through the bottom plate 12 of the first pure water direct injection shed to the first pure water washing tank 13; when the second pure water direct injection electric flow valve 5 is opened, the sprayed pure water flows through the bottom plate 14 of the second pure water direct injection shed to the third pure water washing tank 15.

[0030] This embodiment provides an intelligent water-saving system for pretreatment in a coating line, which adds an electric flow valve, a conductivity sensor, and a conductivity control module. The conductivity sensor is used to automatically detect the conductivity of the pure water in the first and third pure water washes at all times. The conductivity control module controls the flow rate and opening / closing of the electric flow valve based on the detected pure water conductivity. This invention adjusts the flow rate and opening / closing of the first and second pure water direct injections based on the automatic detection of the pure water conductivity in the first and third pure water wash tanks, thereby achieving automatic detection of pure water conductivity and automatic adjustment of water consumption.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A painting line pretreatment intelligent water saving system, characterized in that, The first pure water direct spray, the second pure water direct spray and the pipeline of the pure water device are respectively provided with electric flow valves, the first pure water washing and the third pure water washing are respectively provided with electric conductivity sensors and electric conductivity control modules to detect the electric conductivity of the pure water in the first pure water washing and the third pure water washing main spraying pipes, the first pure water washing electric conductivity control module controls the opening and closing of the first pure water direct spray electric flow valve, and the third pure water washing electric conductivity control module controls the opening and closing of the second pure water direct spray electric flow valve. When the first pure water washing electric conductivity reaches a preset low value, the first pure water direct spray electric flow valve is closed; when the first pure water washing electric conductivity reaches a preset high value, the first pure water direct spray electric flow valve is opened. When the third pure water washing electric conductivity reaches a preset low value, the second pure water direct spray electric flow valve is closed; when the third pure water washing electric conductivity reaches a preset high value, the second pure water direct spray electric flow valve is opened.

2. The intelligent water-saving system for pretreatment of a coating line according to claim 1, characterized in that, The first pure water direct spray electric flow valve is connected in series on the pipeline of the first pure water direct spray main spraying pipe, and the second pure water direct spray electric flow valve is connected in series on the pipeline of the second pure water direct spray main spraying pipe.

3. The intelligent water-saving system for pretreatment of a painting line according to claim 1, characterized in that, The first pure water washing electric conductivity sensor is connected with the first pure water washing electric conductivity control module through a first pure water washing feedback signal line, and the third pure water washing electric conductivity sensor is connected with the third pure water washing electric conductivity control module through a third pure water washing feedback signal line.

4. The intelligent water-saving system for pretreatment of a coating line according to claim 1, characterized in that, The first pure water washing electric conductivity control module is connected with the first pure water direct spray electric flow valve through a first pure water direct spray signal line by controlling the electric conductivity detection range, so as to control the flow size and opening and closing of the first pure water direct spray electric flow valve, and the third pure water washing electric conductivity control module is connected with the second pure water direct spray electric flow valve through a second pure water direct spray signal line by controlling the electric conductivity detection range, so as to control the flow size and opening and closing of the second pure water direct spray electric flow valve.

5. The intelligent water-saving system for pretreatment of a painting line according to claim 1, characterized in that, When the first pure water direct spray electric flow valve is opened, the sprayed pure water flows to the first pure water washing tank through the first pure water direct spray shed bottom plate, and when the second pure water direct spray electric flow valve is opened, the sprayed pure water flows to the third pure water washing tank through the second pure water direct spray shed bottom plate.

6. The intelligent water-saving system for pretreatment of a coating line according to claim 2, characterized in that, The two ends of the first pure water direct spray electric flow valve are respectively connected in series with a first ball valve and a second ball valve, and a third ball valve is connected in parallel on the first pure water direct spray pipeline, the two ends of the second pure water direct spray electric flow valve are respectively connected in series with a fourth ball valve and a fifth ball valve, and a sixth ball valve is connected in parallel on the second pure water direct spray pipeline.

7. The intelligent water-saving system for pretreatment of a coating line according to claim 3, characterized in that, The two ends of the first pure water washing electric conductivity sensor are respectively connected in series with a seventh ball valve and an eighth ball valve, and a ninth ball valve is connected in parallel on the first pure water washing pipeline, and the two ends of the third pure water washing electric conductivity sensor are respectively connected in series with a tenth ball valve and an eleventh ball valve, and a twelfth ball valve is connected in parallel on the third pure water washing pipeline.

8. The intelligent water-saving system for pretreatment of a coating line according to claim 1, characterized in that, Pure water is provided by the pure water device.

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