A ph value control device in a cleaning tank based on an aluminum processing color coating production line

Abstract

The utility model discloses a kind of PH value control device in cleaning tank based on aluminum processing color coated production line, including alkali tank, the side lower end of alkali tank is equipped with conveying pipe, conveying pipe branch line is connected with cleaning tank, alkali solenoid valve is equipped on the branch line of conveying pipe, the side of cleaning tank is equipped with self-circulation pipeline, and circulation pump and electric conductivity instrument are equipped on self-circulation pipeline.The control device can realize the on-line real-time detection and adjustment of cleaning liquid concentration, can stably maintain the concentration of lye in the optimum range required by process, fundamentally avoids the problem of not clean or over cleaning caused by concentration fluctuation, ensures the consistency and efficiency of aluminum strip cleaning effect, prevents the quality defects such as coating color difference, adhesion difference caused by poor cleaning, significantly improves product yield;While can save manpower, reduce the production risk caused by personnel operation negligence, improve overall production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of aluminum surface treatment technology, specifically a pH value control device for a cleaning tank in an aluminum processing color coating production line. Background Technology

[0002] In the aluminum processing and color coating production process, effective cleaning of the aluminum strip surface is a key step to ensure the quality and adhesion of subsequent coatings. The purpose of cleaning is to remove contaminants such as rolling oil, grease, metal debris, and natural oxide film from the aluminum surface. Currently, the industry commonly uses alkaline cleaning solutions for chemical cleaning, and the cleaning effect directly depends on the concentration of the alkaline solution in the cleaning tank. The concentration of the alkaline solution is usually indirectly and accurately reflected by measuring the conductivity of the cleaning solution.

[0003] In existing production lines, the control of alkali concentration in cleaning tanks is relatively crude and outdated. A common method relies on production personnel periodically using handheld conductivity meters to manually check the concentration and then manually replenish the tank based on experience. This method has the following problems: First, manual checking and replenishment cannot achieve continuous and precise control, leading to large fluctuations in the alkali concentration (if the concentration is too low, cleaning is incomplete, and residual contaminants on the aluminum surface will severely affect coating adhesion, causing subsequent coating peeling, color differences, and other quality defects, resulting in a lower yield; if the concentration is too high, it not only wastes alkali but may also cause defects on the aluminum surface due to excessive corrosion, affecting product appearance and performance). Second, it requires frequent operator intervention, increasing labor intensity and posing a risk of quality accidents due to human negligence or untimely operation. Utility Model Content

[0004] The technical problem this invention aims to solve is to overcome existing defects and provide a pH control device for the cleaning tank in an aluminum processing color coating production line. This device enables online real-time detection and adjustment of the cleaning solution concentration, stably maintaining the alkali concentration within the optimal range required by the process. It fundamentally avoids problems of incomplete or over-cleaning caused by concentration fluctuations, ensuring the consistency and efficiency of aluminum strip cleaning. It effectively prevents quality defects such as coating color difference and poor adhesion caused by poor cleaning, significantly improving product yield. Simultaneously, it greatly saves manpower, reduces production risks caused by human error, and improves overall production efficiency, effectively solving the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pH control device for a cleaning tank in an aluminum processing color coating production line, comprising an alkali addition tank, a conveying pipe provided at the lower side of the alkali addition tank, a branch pipe of the conveying pipe connected to a cleaning tank, and an alkali addition solenoid valve provided on the branch pipe of the conveying pipe, a self-circulation pipeline provided on the side of the cleaning tank, and a circulation pump and a conductivity meter provided on the self-circulation pipeline.

[0006] As a preferred embodiment of this utility model, the alkali addition tank is equipped with a level gauge for detecting the internal liquid level.

[0007] As a preferred embodiment of this utility model, the alkali addition tank is provided with a pressure pipe connected to the air outlet of a compressed air device, and the pressure pipe is provided with a pressure relief solenoid valve.

[0008] As a preferred technical solution of this utility model, the alkali tank is provided with a feeding pipe that communicates with the external alkali solution, and the feeding pipe is provided with an alkali diaphragm pump.

[0009] As a preferred embodiment of this utility model, the alkali addition tank is equipped with a safety pressure relief valve.

[0010] As a preferred embodiment of this utility model, the bottom of the alkali addition tank is provided with a drain pipe, and a drain solenoid valve is provided on the drain pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This utility model illustrates a pH control device for the cleaning tank in an aluminum processing color coating production line. This device enables real-time online detection and adjustment of the cleaning solution concentration, stably maintaining the alkali concentration within the optimal range required by the process. This fundamentally avoids problems of incomplete or over-cleaning caused by concentration fluctuations, ensuring the consistency and efficiency of aluminum strip cleaning. It effectively prevents quality defects such as coating color difference and poor adhesion caused by poor cleaning, significantly improving product yield. Simultaneously, it greatly saves manpower, reduces production risks due to human error, and enhances overall production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1 Alkali addition tank, 2 Pressure relief solenoid valve, 3 Alkali addition diaphragm pump, 4 Level gauge, 5 Safety relief valve, 6 Delivery pipe, 61 Alkali addition solenoid valve, 7 Cleaning tank, 8 Self-circulation pipeline, 81 Circulation pump, 82 Conductivity meter. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1 This utility model provides a technical solution: a pH control device for a cleaning tank in an aluminum processing color coating production line, including an alkali addition tank 1, a conveying pipe 6 at the lower side of the alkali addition tank 1, a branch pipe of the conveying pipe 6 connected to a cleaning tank 7, and an alkali addition solenoid valve 61 on the branch pipe of the conveying pipe 6. A self-circulation pipe 8 is provided on the side of the cleaning tank 7, and a circulation pump 81 and a conductivity meter 82 are provided on the self-circulation pipe 8. The circulation pump 81 draws the cleaning liquid from inside the cleaning tank 7 and transports it back into the cleaning tank 7 through the self-circulation pipe 8. During this process, the conductivity meter 82 detects the conductivity of the cleaning liquid and transmits the conductivity signal to the PLC controller. When the conductivity is lower than a preset value, the alkali addition process is triggered.

[0016] Furthermore, the alkali addition tank 1 is equipped with a level gauge 4 to detect the internal liquid level, and a feeding pipe connected to the external alkali solution is provided on the alkali addition tank 1. An alkali addition diaphragm pump 3 is provided on the feeding pipe. The level gauge 4 detects the internal liquid level of the alkali addition tank 1 in real time and transmits the liquid level signal to the PLC controller. When the liquid level in the alkali addition tank 1 is lower than the low liquid level limit, the PLC controller immediately commands the alkali addition diaphragm pump 3 to start and add alkali solution into the alkali addition tank 1. When the liquid level reaches the high liquid level limit, the PLC controller commands the alkali addition diaphragm pump 3 to stop.

[0017] Furthermore, the alkali addition tank 1 is equipped with a pressurization pipe connected to the air outlet of the compressed air equipment. The pressurization pipe is equipped with a pressurization and venting solenoid valve 2. After the alkali addition is completed, the PLC controller controls the pressurization and venting solenoid valve 2 to work, and the compressed air enters the alkali addition tank 1 for pressurization.

[0018] Furthermore, the alkali addition tank 1 is equipped with a safety pressure relief valve 5. Throughout the process, the safety pressure relief valve 5 monitors the pressure inside the tank in real time. When the pressure exceeds the preset threshold, it automatically opens to release pressure, and when the pressure drops to a safe range, it automatically closes.

[0019] Furthermore, the bottom of the alkali addition tank 1 is equipped with a drain pipe, and the drain pipe is equipped with a drain solenoid valve to facilitate the discharge of liquid inside the alkali addition tank 1.

[0020] The pressure relief solenoid valve 2, alkali addition diaphragm pump 3, level gauge 4, alkali addition solenoid valve 61, circulation pump 81, and conductivity meter 82 used in this utility model are all commonly used electronic components in the prior art. Their working methods and circuit structures are well-known technologies and will not be described in detail here. The pressure relief solenoid valve 2, alkali addition diaphragm pump 3, level gauge 4, alkali addition solenoid valve 61, circulation pump 81, and conductivity meter 82 are all electrically connected to an external PLC controller. The conductivity meter 82 is a conductivity analyzer of model SIC-CON5101-GY, the external PLC controller is a Siemens 1517, and the alkali addition solenoid valve 61 is a pneumatic solenoid valve.

[0021] When using: Conductivity test of cleaning fluid inside cleaning tank 7: The circulating pump 81 draws the cleaning fluid from the cleaning tank 7 and transports it back to the cleaning tank 7 through the self-circulation pipeline 8. During this process, the conductivity meter 82 detects the conductivity of the cleaning fluid and transmits the conductivity signal to the PLC controller. When the conductivity is lower than the preset value, the alkali addition process is triggered. Alkali addition mode: The PLC controller controls the corresponding alkali addition solenoid valve 61 to work, so that the alkali solution enters the corresponding cleaning tank 7. The frequency of alkali addition is dynamically adjusted through conductivity feedback to maintain the stability of conductivity in the alkali tank. Alkali tank 1 replenishment mode: The level gauge 4 detects the liquid level inside the alkali addition tank 1 in real time and transmits the liquid level signal to the PLC controller. When the liquid level in the alkali addition tank 1 is lower than the low liquid level limit, the PLC controller immediately commands the alkali addition diaphragm pump 3 to start and add alkali solution into the alkali addition tank 1. When the liquid level reaches the high liquid level limit, the PLC controller commands the alkali addition diaphragm pump 3 to stop. During this process, the pressure relief solenoid valve 2 remains de-energized and in the venting state. After the alkali addition is completed, the PLC controller controls the pressurization and venting solenoid valve 2 to operate, and compressed air enters the alkali addition tank 1 for pressurization; Throughout the process, the safety relief valve 5 monitors the pressure inside the tank in real time. When the pressure exceeds the preset threshold, it automatically opens to relieve pressure, and automatically closes when the pressure drops to a safe range.

[0022] This invention enables online real-time detection and adjustment of the cleaning solution concentration, stably maintaining the alkali concentration within the optimal range required by the process. This fundamentally avoids problems such as incomplete or over-cleaning caused by concentration fluctuations, ensuring the consistency and efficiency of aluminum strip cleaning. It effectively prevents quality defects such as coating color difference and poor adhesion caused by poor cleaning, significantly improving product yield. At the same time, it can greatly save manpower, reduce production risks caused by human negligence, and improve overall production efficiency.

[0023] The parts not disclosed in this utility model are all prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pH control device for a cleaning tank in an aluminum processing color coating production line, comprising an alkali addition tank (1), characterized in that: The lower side of the alkali addition tank (1) is provided with a conveying pipe (6), a branch pipe of the conveying pipe (6) is connected to a cleaning tank (7), and an alkali addition solenoid valve (61) is provided on the branch pipe of the conveying pipe (6). A self-circulating pipe (8) is provided on the side of the cleaning tank (7), and a circulating pump (81) and a conductivity meter (82) are provided on the self-circulating pipe (8).

2. The pH control device in the cleaning tank of the aluminum processing color coating production line according to claim 1, characterized in that: The alkali addition tank (1) is equipped with a level gauge (4) for detecting the liquid level inside.

3. The pH control device for the cleaning tank of the aluminum processing color coating production line according to claim 1, characterized in that: The alkali addition tank (1) is equipped with a pressurization pipe connected to the air outlet of the compressed air equipment, and the pressurization pipe is equipped with a pressurization and venting solenoid valve (2).

4. The pH control device for the cleaning tank of the aluminum processing color coating production line according to claim 1, characterized in that: The alkali addition tank (1) is equipped with a feeding pipe that communicates with the external alkali solution, and the feeding pipe is equipped with an alkali addition diaphragm pump (3).

5. The pH control device for the cleaning tank of the aluminum processing color coating production line according to claim 1, characterized in that: The alkali addition tank (1) is equipped with a safety pressure relief valve (5).

6. The pH control device for the cleaning tank of the aluminum processing color coating production line according to claim 1, characterized in that: The bottom of the alkali addition tank (1) is equipped with a drain pipe, and a drain solenoid valve is installed on the drain pipe.

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