Online detection and automatic replenishment system for phosphorization tank liquid

Abstract

An online detection and automatic replenishment system for a phosphorization tank liquid comprises a sampling pretreatment device, a detection device,a raw material supply device and a PLC. The detection device comprises a liquid adding driver, at least three titration devices, a detection liquid titration driver matched with the titration devices for use and a cleaning device, and the titration devices communicate with an isolation groove through the liquid adding driver and are used for extracting detection sample liquid in batches according to the quantity; the detection liquid titration driver pumps the test standard liquid into the titration devices from a test standard liquid storage device, and sends the dosage of the test standard liquid each time to the PLC and the display terminal; the cleaning device is arranged; the raw material supply device is arranged; and the PLC is arranged. According to the online detection and automatic replenishment system for the phosphorization tank liquid, the plurality of titration devices are designed for the detection device, a potentiometric titration method for detecting a high-concentration solution is combined, online detection of different ion concentrations in the phosphorization tank liquid with complex components is achieved, the relative standard deviation (RSD) of online detection is + / -3%, and the accuracy is + / -3% FS.

Description

technical field [0001] The invention relates to a phosphating treatment device, in particular to an online detection and automatic replenishment system for phosphating bath liquid. Background technique [0002] The phosphating process is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. The purpose of phosphating is mainly to provide protection for the base metal and prevent the metal from being corroded to a certain extent; it is used as a primer before painting to improve the adhesion and anti-corrosion ability of the paint film layer; it plays an anti-friction lubrication role in the metal cold processing process effect. Due to the simple phosphating process, convenient operation and low cost, it is widely used in automobile, aviation, shipbuilding, machinery and daily necessities industries. [0003] There are many types of ions that need to be dete...

AI Technical Summary

Problems solved by technology

Since the indicator cannot change color accurately at the stoichiometric point, the addition of the standard solution cannot be completed just when the indicator changes color, and the addition of half a drop and half a drop is not well controlled when it is close to the end point, so the error of the test result is relatively large, and it varies from person to person. different

②The detection workload is heavy, the detection cycle is long, and the detection data lags behind

Manual detection requires a large number of standard solutions, which is time-consuming and laborious. In addition, each sample to be tested and different types of standard solutions must be manually marked. The work efficiency is low, the detection cycle is long, and the data lags behind. It cannot form a closed loop with the production process control system of the unit. control loops, and are error-prone

③ Manual replenishment, the process is cumbersome, time-consuming and labor-intensive, increases labor costs and is prone to errors

③The degree of data informatization is low

The on-line monitoring and automatic replenishment device of the phosphating solution only realizes the online detection of pH, which cannot meet the online detection of the ion concentration in the phosphating solution, and the replenishment of the phosphating bath solution is realized through the pH monitoring value, and its accuracy is low

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