An on-line automatic testing device and method for electrophoresis line pretreatment tank solution

Abstract

The application relates to an electrophoresis line pretreatment tank liquor online automatic testing device and method, which comprises a sampling device, a testing device and an electric control device; one end of the sampling device is communicated with the tank liquor, and the other end is communicated with a testing container; one end of the testing device is communicated with a titration liquor container, and the other end is communicated with the testing container; the sampling device and the testing device are controlled by the electric control device; the application can realize automatic testing of four important titration parameters of the electrophoresis line pretreatment, including pre-degreasing free alkali, degreasing free alkali, total phosphating acid and phosphating free acid; the influence of turbidity on the detection result can be completely avoided; the detection efficiency is better than the artificial detection efficiency; and the detection result accuracy is better than the photometric detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of automotive electrophoresis technology, and in particular to an online automated testing device and method for pretreatment tank solutions in electrophoresis lines. Background Technology

[0002] Currently, the parameter testing of pretreatment tank solutions in automotive electrophoresis lines mostly relies on manual sampling and analysis. First, a lab technician obtains the tank solution from the electrophoresis line, then performs acid-base titration in the laboratory, and finally manually calculates the results. The titration process requires the technician to use a pipette to transfer a quantitative amount of the tank solution from the sample to a testing container as the test solution. Then, according to the properties of the test solution, an appropriate indicator is added, and titration is performed using a burette. Titration stops when the indicator changes color, the amount of titrant consumed is recorded, and the titration result is calculated. However, this method has the following problems: existing manual testing technology requires one lab technician per shift for each electrophoresis line, and the frequency of testing is low. The accuracy of manual testing results is not high, and over-titering is prone to occur, leading to large fluctuations in tank solution parameters, increasing the cost of the pretreatment process in the electrophoresis line, and causing frequent quality problems.

[0003] Currently, some OEMs use photometric automated testing systems for the pretreatment tank parameters in automotive electrophoresis lines. These systems utilize the principle of indicator color change, identifying the endpoint of the test by detecting changes in the color of the liquid being tested, thus obtaining the test results. The photometric testing system first uses a pump to extract a quantitative amount of the test tank solution from the line, then adds an indicator, and then uses another pump to add titrant for titration. Titration stops when the test tank solution changes color, and the result is calculated based on the volume of titrant consumed and the volume of test tank solution taken. However, the following problems exist: Photometric methods rely on color changes to determine the titration endpoint, but some tank solutions are turbid, affecting the identification of color changes and leading to errors in the results. Furthermore, photometric methods require light detection devices and indicators, making them relatively expensive. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an online automated testing device and method for electrophoresis pretreatment tank solutions.

[0005] This invention is achieved using the following technical solution:

[0006] An online automated testing device for electrophoresis line pretreatment tank solution includes a sampling device, a testing device, and an electrical control device;

[0007] The sampling device is connected at one end to the tank liquid and at the other end to the test container; the test device is connected at one end to the titration container and at the other end to the test container, and the sampling device and the test device are controlled by the electronic control device.

[0008] As a further explanation of the invention, the sampling device includes a front sampling tube, a rear sampling tube, and a sampling peristaltic pump; the front sampling tube is connected to the tank liquid, the rear sampling tube is connected to the test container, and the sampling peristaltic pump is disposed between the front sampling tube and the rear sampling tube.

[0009] As a further explanation of the invention, the testing device includes a front burette, a rear burette, and a titration peristaltic pump; the front burette is connected to a titrant container, the rear burette is connected to a testing container, and the titration peristaltic pump is disposed between the front burette and the rear burette.

[0010] As a further illustration of the invention, the electronic control device includes a programmable controller, an online pH monitor, a pH electrode, and a solenoid valve;

[0011] The solenoid valve is located at the bottom of the test container, the pH electrode is located inside the test container, the pH electrode is connected to the pH online monitor, and the sampling peristaltic pump, the solenoid valve, and the pH online monitor are controlled by the programmable controller.

[0012] An online automated testing method for electrophoresis pretreatment tank solutions, the method being based on acid-base titration, comprising:

[0013] When the tank solution analysis begins, the programmable logic controller (PLC) sends a sampling command to the sampling peristaltic pump according to the set program via the sampling signal transmission line, and simultaneously sends a closing command to the solenoid valve via the solenoid valve control line. After receiving the sampling command, the sampling peristaltic pump begins to perform quantitative sampling according to the set program. The sampled tank solution flows through the front sampling tube into the rear sampling tube, and then into the analysis container. Subsequently, the sampling peristaltic pump sends a sampling completion signal to the PLC via the sampling signal transmission line.

[0014] After receiving the sampling completion signal, the programmable controller records the volume of the sampled liquid. The programmable controller sends a titration command to the titration peristaltic pump through the titration signal transmission line according to the set program. After receiving the titration command, the titration peristaltic pump starts titrating according to the set program. The titrant is stored in the titrant container and flows through the front burette into the back burette and then into the test container.

[0015] Simultaneously, the pH electrode continuously transmits the pH signal to the pH online monitor via the front-end pH signal transmission line, and the programmable controller reads the pH data from the pH online monitor via the back-end pH signal transmission line. When the pH data meets the set conditions, the programmable controller sends a stop titration command to the titration peristaltic pump via the titration signal transmission line and reads the titrant consumption data. At the same time, the programmable controller sends an open command to the solenoid valve via the solenoid valve control line, and the solenoid valve remains open until the next test begins. Finally, the programmable controller calculates the test results according to the set program and stores the results.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] This invention can automate the testing of four important titration parameters of electrophoresis lines: pre-degreasing free alkali, defatted free alkali, total phosphoric acid, and phosphoric acid. It can completely avoid the influence of turbidity on the test results, and the test efficiency is better than that of manual test, while the accuracy of the test results is better than that of photometric test. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] In the diagram, 1 is the sampling device; 2 is the testing device; 3 is the electrical control device; 11 is the front sampling tube; 12 is the sampling peristaltic pump; 13 is the rear sampling tube; 14 is the sampling signal transmission line; 15 is the solenoid valve; 16 is the testing container; 21 is the titrant container; 22 is the front burette; 23 is the titration peristaltic pump; 24 is the rear burette; 25 is the titration signal transmission line; 31 is the programmable logic controller; 32 is the rear pH signal transmission line; 33 is the online pH monitor; 34 is the front pH signal transmission line; 35 is the pH electrode; and 36 is the solenoid valve control line. Detailed Implementation

[0020] like Figure 1 As shown, an online automated testing device for electrophoresis pretreatment tank solution includes a sampling device 1, a testing device 2, and an electrical control device 3.

[0021] Sampling device 1 is connected to the tank liquid at one end and to the test container 16 at the other end; test device 2 is connected to the titration container 21 at one end and to the test container 16 at the other end. Sampling device 1 and test device 2 are controlled by electronic control device 3.

[0022] The sampling device 1 includes a front sampling tube 11, a rear sampling tube 13, and a sampling peristaltic pump 12. The front sampling tube 11 is connected to the bath solution (it should be noted that the pretreatment bath refers to the functional baths for surface treatment before the electrophoresis tank of the electrophoresis line, and the bath solution includes four important titration parameters of the line: degreasing free alkali, degreasing free alkali, total phosphating acid, and phosphating free acid). The rear sampling tube 13 is connected to the test container 16. The sampling peristaltic pump 12 is installed between the front sampling tube 11 and the rear sampling tube 13.

[0023] The testing apparatus 2 includes a front burette 22, a rear burette 24, and a titration peristaltic pump 23; the front burette 22 is connected to the titrant container 21, the rear burette 24 is connected to the testing container 16, and the titration peristaltic pump 23 is installed between the front burette 22 and the rear burette 24.

[0024] The electronic control device 3 includes a programmable controller 31, an online pH monitor 33, a pH electrode 34, and a solenoid valve 15;

[0025] Solenoid valve 15 is located at the bottom of test container 16, pH electrode 34 is located inside the test container and connected to pH online monitor 33. Sampling peristaltic pump 12, sampling peristaltic pump 23, solenoid valve 15 and pH online monitor 33 are controlled by programmable controller 31. Preferably, programmable controller 31 is a PLC controller.

[0026] An online automated testing method for electrophoresis pretreatment tank solutions, the method being based on acid-base titration, includes:

[0027] When the tank solution analysis begins, the programmable controller 31 sends a sampling command to the sampling peristaltic pump 12 according to the set program via the sampling signal transmission line 14, and simultaneously sends a closing command to the solenoid valve 15 via the solenoid valve control line. After receiving the sampling command, the sampling peristaltic pump 12 begins to perform quantitative sampling according to the set program. The sampled tank solution flows through the front sampling tube 11 into the rear sampling tube 13, and then into the analysis container 16. Subsequently, the sampling peristaltic pump 12 sends a sampling completion signal to the programmable controller 31 via the sampling signal transmission line 14.

[0028] After receiving the sampling completion signal, the programmable controller 31 records the volume of the sampled liquid. The programmable controller 31 sends a titration command to the titration peristaltic pump 23 according to the set program through the titration signal transmission line 25. After receiving the titration command, the titration peristaltic pump 23 starts titrating according to the set program. The titrant is stored in the titrant container 21. The titrant flows through the front burette 22 into the rear burette 24 and then into the test container 16.

[0029] Meanwhile, the pH electrode 34 continuously transmits the pH signal to the pH online monitor 33 through the front-end pH signal transmission line 34, and the programmable controller 31 reads the pH data in the pH online monitor 33 through the back-end pH signal transmission line 32. When the pH data meets the set conditions, the programmable controller 31 sends a stop titration command to the titration peristaltic pump 23 through the titration signal transmission line 25 and reads the titrant consumption data. At the same time, the programmable controller 31 sends an opening command to the solenoid valve 15 through the solenoid valve 15 control line. The solenoid valve 15 remains open until the next test begins. Finally, the programmable controller 31 calculates the test results according to the set program and stores the results.

[0030] Through experimentation, this invention can automate the testing of four important titration parameters of electrophoresis lines: pre-degreasing free alkali, defatted free alkali, total phosphoric acid, and phosphoric acid. The frequency can be increased from twice a day to more than once an hour, and the test results are displayed on the screen in real time. The number of test data points has been increased from 2 per day to 24 per day. The data is automatically stored and can be exported for data analysis. It can completely avoid the influence of turbidity on the test results, and the detection efficiency is better than that of manual detection, while the accuracy of the test results is better than that of photometric detection.

Claims

1. An online automated testing device for pretreatment tank solutions in an electrophoresis line, characterized in that, Includes sampling equipment, testing equipment, and electronic control equipment; The sampling device is connected at one end to the tank liquid and at the other end to the test container; the test device is connected at one end to the titration container and at the other end to the test container, and the sampling device and the test device are controlled by the electronic control device.

2. The online automated testing device for the pretreatment tank solution of the electrophoresis line as described in claim 1, characterized in that, The sampling device includes a front sampling tube, a rear sampling tube, and a sampling peristaltic pump; the front sampling tube is connected to the tank liquid, the rear sampling tube is connected to the test container, and the sampling peristaltic pump is provided between the front sampling tube and the rear sampling tube.

3. The online automated testing device for the pretreatment tank solution of the electrophoresis line as described in claim 1, characterized in that, The testing apparatus includes a front burette, a rear burette, and a titration peristaltic pump; the front burette is connected to a titrant container, the rear burette is connected to a testing container, and the titration peristaltic pump is disposed between the front burette and the rear burette.

4. The online automated testing device for the pretreatment tank solution of the electrophoresis line as described in claim 3, characterized in that, The electronic control device includes a programmable controller, an online pH monitor, a pH electrode, and a solenoid valve; The solenoid valve is located at the bottom of the test container, the pH electrode is located inside the test container, the pH electrode is connected to the pH online monitor, and the sampling peristaltic pump, the solenoid valve, and the pH online monitor are controlled by the programmable controller.

5. An online automated testing method for electrophoresis pretreatment tank solutions, comprising the online automated testing device for electrophoresis pretreatment tank solutions as described in any one of claims 1-4, characterized in that, The method is based on acid-base titration and includes: When the tank solution analysis begins, the programmable logic controller (PLC) sends a sampling command to the sampling peristaltic pump according to the set program via the sampling signal transmission line, and simultaneously sends a closing command to the solenoid valve via the solenoid valve control line. After receiving the sampling command, the sampling peristaltic pump begins to perform quantitative sampling according to the set program. The sampled tank solution flows through the front sampling tube into the rear sampling tube, and then into the analysis container. Subsequently, the sampling peristaltic pump sends a sampling completion signal to the PLC via the sampling signal transmission line. After receiving the sampling completion signal, the programmable controller records the volume of the sampled liquid. The programmable controller sends a titration command to the titration peristaltic pump through the titration signal transmission line according to the set program. After receiving the titration command, the titration peristaltic pump starts titrating according to the set program. The titrant is stored in the titrant container and flows through the front burette into the back burette and then into the test container. Simultaneously, the pH electrode continuously transmits the pH signal to the pH online monitor via the front-end pH signal transmission line, and the programmable controller reads the pH data from the pH online monitor via the back-end pH signal transmission line. When the pH data meets the set conditions, the programmable controller sends a stop titration command to the titration peristaltic pump via the titration signal transmission line and reads the titrant consumption data. At the same time, the programmable controller sends an open command to the solenoid valve via the solenoid valve control line, and the solenoid valve remains open until the next test begins. Finally, the programmable controller calculates the test results according to the set program and stores the results.

Images