CN2055953U

CN2055953U - On-line automatic controller for solution ph value

Info

Publication number: CN2055953U
Application number: CN 89217593
Authority: CN
Inventors: 张翠芬; 刘昭和
Original assignee: Harbin Institute of Technology Shenzhen
Current assignee: Harbin Institute of Technology Shenzhen
Priority date: 1989-09-28
Filing date: 1989-09-28
Publication date: 1990-04-11

Abstract

An online automatic control device for the pH value of a solution, including sampling and comparison, a sensor and a microcomputer system, the device can control the pH value of the solution online in real time, its structure is simple, its volume is small, and the speed of measurement and control is fast. Small volume, less reagent water consumption, easy to operate, high accuracy, can automatically complete the functions of washing, calibration, sampling, measurement, adjustment, no waste, no waste liquid, no pollution.

Description

On-line automatic controller for solution pH value

The utility model relates to a kind of automaton that is used for On-line Control solution pH value, belongs to the chemical industry automatic control equipment.

The pH value of solution has bigger influence to the character and the quality of solution, and as for electroplate liquid, its pH value influences current efficiency and reaction velocity, thereby influences the quality of coating.Therefore, the pH value of solution must be controlled in the suitable scope.For the pH value that guarantees solution accurately, must carry out frequent mensuration and correction to the PH of solution, for example just must carry out frequent correction, thereby must realize washing automatically and calibrate automatically according to the variation of electrode characteristic for electroplate liquid.Existing technique device can only detect the pH value of solution automatically, and can not realize the pH value of solution is realized control automatically.In the pH value pick-up unit of solution, adopt PH glass electrode or terraced electrode more, and directly go into the electrode skewer in the solution tank or the flow duct of solution in, be difficult for realizing the automatic cleaning of electrode, can not carry out the calibration of electrode.Also have on-line measurement solution PH device is independent of outside the container, electrode is placed in another container (glass electrode), and this vessel volume is big, washing, calibration, sampling fluid volume are big, flushing electrode difficulty, and dead volume is big, the cycle of measuring once is long, the equipment complexity, and volume is big.

The purpose of this utility model is to provide a kind of device that can be used for the on-line automatic control of solution pH value, it is simple in structure, and volume is little, and speed is fast, sampling amount is little, the consumption reagent water is few, easy operating, accuracy height, can finish the function of washing, calibration, sampling, measurement, adjusting automatically, and there is not waste, no waste liquid, pollution-free.

Structure of the present utility model as shown in drawings.Represent among the figure, comprise hand valve 1,2,3,4,5, solenoid valve 6,7 in the structure of this device, sluice valve 8, temperature sensor 9, PVS circulation PH sensitive electrode 10, contrast electrode (calomel) 11, acid solution container 12, aqueous slkali container 13, standard specimen I (H ₂O) 14, standard specimen II 15, standard specimen III 16, sampling pump 17, pH value detecting device JC, microsystem μ C shows and warning device that the caliber of wherein measuring the PH stream is φ 1.5～2mm, PVC circulation PH sensitive electrode is φ 1.5～2mm.Acid, aqueous slkali container 12,13 respectively by pipeline through hand valve 4,5 or solenoid valve 6,7 lead to controlled solution container, sampling pump is connected with the inlet I of controlled solution container and sluice valve 8 respectively by pipeline, the standard specimen I, II, III respectively by pipeline through hand valve 1,2,3 with the II of sluice valve 8, III, the VI inlet connects, 8 outlet is led to controlled solution by pipeline, diverse location in this section pipeline is provided with 9 respectively, 10 and 11,9 output is connected with μ C input end, the output terminal of JC is connected 6 with the input end of μ C, 7,17, demonstration and warning device are controlled by μ C output terminal.Automated procedure of the present utility model is as follows:

1, washs automatically and calibrate

Sluice valve DXT beats to II, and deionized water flows through flow-thru electrode automatically, cleaning electrode 3～5 minutes; Sluice valve is beaten to III, and the standard solution I flow through the PVC flow-thru electrode 3～5 minutes, detects the current potential E of PHBI correspondence ₁Sluice valve DXT beats to II, washes 3～5 minutes sluice valve DXT and beats to VI, and the standard solution II flow through the PVC electrode 3～5 minutes, detects the current potential E of PHB II correspondence ₂, computing machine is separated simultaneous equations of binary automatically.

E ₁＝K ₁＋K ₂PH _BⅠ…………（1）

E ₂＝K ₁＋K ₂PH _BⅡ…………（2）

Obtain given COEFFICIENT K ₁, K ₂E, the PH equation is as follows:

E＝K ₁＋K ₂PH …………（3）

Standard solution is the buffer solution identical with bath element.

2, automatic sampling and measuring

Sluice valve DXT beats to II, washing circulation telegram 3～5 minutes, sluice valve is beaten to I, opened sampling pump simultaneously 3～5 minutes, plating bath to be measured flows through the PVC flow-thru electrode, is no more than 40 ℃ as plating bath temperature in groove, then need after cooling, to enter the PVC flow-thru electrode, after 3～5 minutes, the electromotive force that JC detects the primary element of PVC electrode and calomel reference electrode composition is EX to liquid to be measured, presses following formula (3) and calculates and the PHX value by the PVC electrode.

3, regulate PH automatically

Sampling is compared with the scope of giving the PH adaptation of putting that calculator memory is store after detecting plating bath PHx.

As if PHx＞PH(upper limit) or PHx＜PH(lower limit), add acid or alkali addition valve and opened 10 * (PHx-C) * 20 seconds automatically, add acid by adjusting, add the flow velocity and the acid base concentration of alkali, regulate the amount that adds acid, alkali.

4, fault alarm

(1) the super upper limit alarm of PH: if PHx＞PH(upper limit) ₂Report to the police

(2) the super lower limit of PH is reported to the police: if PHx≤PH(lower limit) ₂Report to the police

(3) PH electrode system fault alarm; PH _{The B I}For determining numerical value, when flowing through the PVC electrode, the standard solution I surveys and PH, if

PH-PH _{The B I}＞0.2 warning, indication PH electrode system has fault.

The effect of this device

1, can realize the online automatic detection and the control of solution pH value;

2, simple in structure easy to operate, consume liquid to be measured, calibration solution water is few;

3, speed is fast, accurate;

4, reclaim easily, do not have waste, pollution-free.

Accompanying drawing is a structural drawing of the present utility model.

Embodiment: single stage method copper facing, PH accommodation are 8.5～9.5;

If survey and PHx＞9.30, then the acid adding valve opening time is 10 * (PHx-8.7) * 20 PH(upper limits here) ₁=9.30

If survey and PHx＜8.70, then alkali addition valve is opened, and the time is 10 * (PHx-8.7) * 20 C=8.70 PH(lower limits here) ₁=8.70

Single stage method copper facing consumes H ⁺, electroplating process PH raises, and mostly is usually to add acid and regulate PH and play a timing and need add alkali and transfer to accommodation adding acid.

Claims

1. An automatic control device for online control of the pH value of a solution, comprising standard sample I (H ₂ O) 14, standard sample II 15, standard sample III 16, acid solution container 12, and alkali solution container 13. It is characterized in that the device also It consists of the following parts, manual valves 1, 2, 3, 4, 5, solenoid valves 6, 7, strobe valve 8, temperature sensor 9, PVC circulation PH sensitive electrode 10 reference electrode (calomel) 11, sampling pump 17 , PH value detector JC microcomputer system μC; display and alarm device, in which the measuring PH flow path and pipe diameter are φ1.5-2mm, the PVC circulation PH sensitive electrode is φ1.5-2mm, acid and alkali solution containers 12, 13 The pipelines lead to the controlled solution container through manual valves 4, 5 or electromagnetic valves 6, 7 respectively, and the sampling pump is respectively connected to the controlled solution container and the inlet I of the gating valve 8 through the pipelines. Standard samples I and II , III are respectively connected to the inlets II, III, and VI of the gate valve 8 through the manual valves 1, 2, and 3 through the pipeline, and the outlet of 8 is connected to the controlled solution through the pipeline. Different positions in this section of the pipeline are respectively Set 9, 10 and 11, the output of 9 is connected to the input terminal of μC, the output terminal of 10 and 11 is connected to the output terminal of JC, the output terminal of JC is connected to the input terminal of μC, and the display and alarm devices of 6, 7 and 17 are all Controlled by the μC output.