CN104034760A - Multifunctional tin plate surface characteristic testing device and use method thereof - Google Patents
Multifunctional tin plate surface characteristic testing device and use method thereof Download PDFInfo
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- CN104034760A CN104034760A CN201310069427.2A CN201310069427A CN104034760A CN 104034760 A CN104034760 A CN 104034760A CN 201310069427 A CN201310069427 A CN 201310069427A CN 104034760 A CN104034760 A CN 104034760A
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Abstract
The invention relates to plating test of tin plates, in particular to a multifunctional tin plate surface characteristic testing device, which includes a PC, a multi-channel constant current power supply module and a PLC. The multi-channel constant current power supply module is a high precision program control constant current direct current power supply module, and also includes a control measurement circuit. The control measurement circuit comprises a precise sampling resistor, a first instrumentation amplifier, a second instrumentation amplifier, a third instrumentation amplifier, a field-effect transistor, an A/D converter, and a D/A converter. According to the invention, by adopting the design, and through the high precision program control constant current direct current power supply module for controlling the current error and a calculation formula for measuring end time, the testing precision of various tin plate samples can be improved comprehensively.
Description
Technical field
The present invention relates to the coating test of tin plate, relate in particular to tin plate quality of coating measuring system.
Background technology
The zinc-plated amount test method of < < GB/T 1838-2008 ferrostan > >, the test method > > of the new national standard < < electrolytic tinplate surface chromium of working out in 2010, < < tin plate guide > >, the documents such as < < taggers tin and sheet iron of wuxi > > and the standard < < EN10333-2005 of European Union " tin plate that packing contacts with Food & Drink with humans and animals with steel " appendix A > > provide respectively Applied Electrochemistry method measurement tin plate sheet surface characteristic schematic diagram of device.It is lower that these measurement mechanisms are manual measurement device, complicated operation, device reliability, and be folk prescription method list functional device.
Number of patent application is the multifunctional measuring instrument that the application of 201110272495.X discloses a kind of all automatic measurement; it can automatically be tested the tin/alloy tin of tin plate, oxide film, passivating film sample; yet; each measuring unit of this equipment is independent of one another; use at instrument; especially in enormous quantities, scale measurement, plant maintenance, etc. aspect there is open defect, meanwhile, there is no that accurate Measuring Time is controlled, computing module is also the open defect of this device.
Summary of the invention
The object of the present invention is to provide a kind ofly to can be used in enormous quantities, scale and measure, accurately the multi-functional tin plate sheet surface characteristic test device of control survey time.
In order to achieve the above object, the present invention is achieved in that
A kind of multi-functional tin plate sheet surface characteristic test device, it comprises that a PC, multiple constant current power module, PLC, described PC and this PLC are connected, and have by this PLC control linkage: plumbous needed sample preparation liquid totally four the automatic measurement subsystems of measuring in the zinc-plated amount of tin plate sheet surface or alloy tin measurement amount, passivating film amount, oxide film amount and coating; Described PLC is also connected with an air-path control system; In the zinc-plated amount of described tin plate sheet surface or alloy tin measurement amount, passivating film amount, oxide film amount and coating, the needed sample preparation liquid measurement subsystem of plumbous mensuration all comprises separately:
Electrolytic tank, electrolytic tank consists of the sub-electrolytic tank in two of left and right, and groove is nested with an O-ring seal contacting with tin plate plate face to be measured, and tin plate to be measured bottom is provided with backstay;
Two cover electrodes, using and insert the silver electrode of electrolytic tank or mercurous chloride electrode as contrast electrode, insert the carbon electrode of electrolytic tank for introducing steady current;
A chemical tank, contains electrolytic stripping liquid in chemical tank, and is communicated with electrolytic tank by peristaltic pump;
In described coating, the needed sample preparation liquid measurement subsystem of plumbous mensuration also comprises a sample divider that connects this subsystem electrolytic tank;
Described air-path control system comprises that a pneumatic valve and one are used for the sealing of close encapsulation circle, tin plate to be measured and carry out bar;
Described multiple constant current power module is high-precision program control continuous current DC power supplier, also comprise control survey circuit, described control survey circuit comprises accurate sample resistance, first instrument amplifier, second instrument amplifier, the 3rd instrument amplifier, field effect transistor, A/D converter, D/A converter, field effect transistor is connected with contrast electrode, the output terminal of the 3rd instrument amplifier, accurate sample resistance is in parallel with field effect transistor respectively, the positive input terminal of the 3rd instrument amplifier is connected with the output terminal of first instrument amplifier, the output terminal of the negative input end of the 3rd instrument amplifier and second instrument amplifier, the output terminal of A/D converter is in parallel, the positive input terminal of second instrument amplifier, negative input end is connected to the two ends of accurate sample resistance, the positive input terminal of first instrument amplifier is connected with the output terminal of D/A converter, the negative input end of first instrument amplifier is parallel to the output terminal of first instrument amplifier, the output terminal of A/D converter, D/A converter is connected with the CPU of PC respectively, the positive pole of described control survey circuit is connected with carbon electrode, and negative pole is connected with contrast electrode.
The method that the multi-functional tin plate sheet surface characteristic test device of a kind of use carries out zinc-plated measurement examination:
Step 1, sample is carried out to chemical degreasing;
Step 2, zinc-plated amount detect;
Step 2.1, sample is put into electrolytic tank;
Step 2.2, tester are closed electrolytic tank;
Step 2.3, tester add electrolytic tank by hydrochloric acid, until fill it up with, stop liquid feeding;
Step 2.4, at sample and two contrast electrodes, add default steady current simultaneously; Start electrolysis detin reaction;
Step 2.5, the voltage of sample and two test electrodes is carried out to record, and measure terminal computing judgement; Until the feature current potential that the detin of reflection sample completes occurs;
After step 2.6, feature current potential occur, stop test, disconnect steady current, and open reactive tank, emptying hydrochloric acid
Step 2.7, according to current value, the time that feature current potential occurs, examination is supported and the area equivalent calculation of hydrochloric acid contact reaction part goes out zinc-plated amount.
The method that the multi-functional tin plate sheet surface characteristic test device of described use carries out zinc-plated measurement examination; It is characterized in that: also comprise the computing method of measuring terminal:
First the data that gather are carried out to arithmetic mean filtering algorithm, and introduce its formula and be
, wherein, N=3, xi is efficiently sampling data.
The present invention adopts above-mentioned design, by high-precision program control continuous current DC power supplier, controls current error and Measuring Time endpoint calculation formula, comprehensively improves the measuring accuracy of each sample of tin plate.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is slot electrode schematic diagram;
Fig. 3 is the schematic diagram of control survey circuit of the present invention.
Embodiment
By specific embodiment, further illustrate the present invention below.
As shown in Figure 1 and Figure 2, a kind of tin plate sheet surface quality of coating full-automatic multi-functional measuring system, it comprises a PC 1 and a constant current supply 2, described constant current supply 2 is multi-path digital-control constant current supply, described full-automatic multi-functional measuring system also comprises: a PLC 3, described PC 1 is connected with this PLC 3, and has by these PLC 3 control linkages: plumbous needed sample preparation liquid 7 totally four the automatic measurement subsystems of measuring in the zinc-plated amount of tin plate sheet surface or alloy tin measurement amount 4, passivating film amount 5, oxide film amount 6 and coating; Described PLC 3 is also connected with an air-path control system 8.
Described a kind of tin plate sheet surface quality of coating full-automatic multi-functional measuring system, in the zinc-plated amount of described tin plate sheet surface or alloy tin measurement amount, passivating film amount, oxide film amount and coating, the needed sample preparation liquid measurement subsystem 4,5,6,7 of plumbous mensuration includes independent electrolytic measurement groove separately;
Electrolytic tank 11, electrolytic tank 11 consists of the sub-electrolytic tank in two of left and right, and groove is nested with an O-ring seal 12 contacting with tin plate 9 plate faces to be measured, and tin plate to be measured 9 bottoms are provided with backstay 10;
A set of electrode, electrode insertion groove 11 inside are as the carbon electrode of working electrode 13, and the silver electrode of insertion electrolytic tank 11 or mercurous chloride electrode are as contrast electrode 14;
A chemical tank 16, contains electrolytic stripping liquid in chemical tank 16, and is communicated with electrolytic tank 11 by peristaltic pump 17;
Described air-path control system 8 comprises that a pneumatic valve 81 and one are used for the sealing of close encapsulation circle 12, tin plate to be measured 9 and carry out bar 82.
As shown in Figure 3, described multiple constant current power module is high-precision program control continuous current DC power supplier, also comprise control survey circuit, described control survey circuit comprises accurate sample resistance 22, first instrument amplifier 19, second instrument amplifier 20, the 3rd instrument amplifier 21, field effect transistor 25, A/D converter 17, D/A converter 18, field effect transistor 25 is connected with contrast electrode 14, the output terminal of the 3rd instrument amplifier 21, accurate sample resistance 22 is in parallel with field effect transistor 25 respectively, the positive input terminal of the 3rd instrument amplifier 21 is connected with the output terminal of first instrument amplifier 19, the output terminal of the negative input end of the 3rd instrument amplifier 17 and second instrument amplifier 20, the output terminal of A/D converter 17 is in parallel, the positive input terminal of second instrument amplifier 20, negative input end is connected to the two ends of accurate sample resistance 22, the positive input terminal of first instrument amplifier 19 is connected with the output terminal of D/A converter 18, the negative input end of first instrument amplifier 19 is parallel to the output terminal of first instrument amplifier 19, the output terminal of A/D converter 17, D/A converter 18 connects respectively at the CPU26 of PC 1, the positive pole of described control survey circuit is connected with carbon electrode (working electrode) 13, and negative pole is connected with contrast electrode 14.
The principle of control survey circuit is: accurate sample resistance converts the current signal of flowing through to corresponding voltage signal and sends into second instrument amplifier and carry out ratio amplification; Second, third instrument amplifier forms reverse amplification circuit jointly, by negative feedback drive field effect transistor by electric current preliminarily stabilised in setting value, so, realized constant current source output.In circuit, second instrument amplifier is sent into CPU by the magnitude of voltage of the electric current of correspondence output simultaneously after A/D converter sampling.CPU carries out accurate comparison by itself and the electric current branch of setting, and error signal is exported through D/A converter, after first instrument amplifier buffer, send as the positive input terminal of the 3rd instrument amplifier, thereby constant current source output current value is regulated accurately.So, form closed-loop control and provide and tin plate is carried out the way of two-sided test simultaneously.
Described multi-functional tin plate sheet surface characteristic test device, also comprises the computing method of measuring terminal:
First the data that gather are carried out to arithmetic mean filtering algorithm, and introduce its formula and be
, wherein, N=3, xi is efficiently sampling data.
As can be seen from the above equation, filter effect depends on sampling number N, and N is larger, and filter effect is better, but along with the increase of N, more obvious to the destruction of data unique point, when N=3, on curve, data characteristics point is the most obvious.After filtering, then data are carried out to differential calculation one time, the curve going out in 2 maximal values corresponding be exactly the unique point in potential-time curve, the position according to it in curve just can record dissolution time.According to parameters such as current density, reaction areas, just can measure the parameters such as zinc-plated amount of steel plate sample again.
The present invention adopts above-mentioned design, during use, according to following step, carries out:
Step 1, sample is carried out to chemical degreasing;
Step 2, zinc-plated amount detect;
Step 2.1, sample is put into electrolytic tank;
Step 2.2, tester are closed electrolytic tank;
Step 2.3, tester add electrolytic tank by hydrochloric acid, until fill it up with, stop liquid feeding;
Step 2.4, at sample and two contrast electrodes, add default steady current simultaneously; Start electrolysis detin reaction;
Step 2.5, the voltage of sample and two test electrodes is carried out to record, and measure terminal computing judgement; Until the feature current potential that the detin of reflection sample completes occurs;
After step 2.6, feature current potential occur, stop test, disconnect steady current, and open reactive tank, emptying hydrochloric acid
Step 2.7, according to current value, the time that feature current potential occurs, the area equivalent calculation of sample and hydrochloric acid contact reaction part goes out zinc-plated amount.
The present invention adopts above-mentioned design, by high-precision program control continuous current DC power supplier, controls current error and Measuring Time endpoint calculation formula, comprehensively improves the measuring accuracy of each sample of tin plate.
Claims (8)
1. a multi-functional tin plate sheet surface characteristic test device, it comprises that a PC, multiple constant current power module, PLC, described PC and this PLC are connected, and have by this PLC control linkage: plumbous needed sample preparation liquid totally four the automatic measurement subsystems of measuring in the zinc-plated amount of tin plate sheet surface or alloy tin measurement amount, passivating film amount, oxide film amount and coating.
2. multi-functional tin plate sheet surface characteristic test device according to claim 1, is characterized in that: described PLC is also connected with an air-path control system.
3. multi-functional tin plate sheet surface characteristic test device according to claim 1, is characterized in that: plumbously in the zinc-plated amount of described tin plate sheet surface or alloy tin measurement amount, passivating film amount, oxide film amount and coating measure needed sample preparation liquid measurement subsystem and all comprise separately:
Electrolytic tank, electrolytic tank consists of the sub-electrolytic tank in two of left and right, and groove is nested with an O-ring seal contacting with tin plate plate face to be measured, and tin plate to be measured bottom is provided with backstay;
Two cover electrodes, using and insert the silver electrode of electrolytic tank or mercurous chloride electrode as contrast electrode, insert the carbon electrode of electrolytic tank for introducing steady current;
A chemical tank, contains electrolytic stripping liquid in chemical tank, and is communicated with electrolytic tank by peristaltic pump.
4. multi-functional tin plate sheet surface characteristic test device according to claim 1, is characterized in that: in described coating, the needed sample preparation liquid measurement subsystem of plumbous mensuration also comprises a sample divider that connects this subsystem electrolytic tank.
5. multi-functional tin plate sheet surface characteristic test device according to claim 1, is characterized in that: described air-path control system comprises that a pneumatic valve and one are used for the sealing of close encapsulation circle, tin plate to be measured and carry out bar.
6. multi-functional tin plate sheet surface characteristic test device according to claim 1, it is characterized in that: described multiple constant current power module is high-precision program control continuous current DC power supplier, also comprise control survey circuit, described control survey circuit comprises accurate sample resistance, first instrument amplifier, second instrument amplifier, the 3rd instrument amplifier, field effect transistor, A/D converter, D/A converter, field effect transistor is connected with contrast electrode, the output terminal of the 3rd instrument amplifier, accurate sample resistance is in parallel with field effect transistor respectively, the positive input terminal of the 3rd instrument amplifier is connected with the output terminal of first instrument amplifier, the output terminal of the negative input end of the 3rd instrument amplifier and second instrument amplifier, the output terminal of A/D converter is in parallel, the positive input terminal of second instrument amplifier, negative input end is connected to the two ends of accurate sample resistance, the positive input terminal of first instrument amplifier is connected with the output terminal of D/A converter, the negative input end of first instrument amplifier is parallel to the output terminal of first instrument amplifier, the output terminal of A/D converter, D/A output translator connects respectively at the CPU of PC, the positive pole of described control survey circuit is connected with carbon electrode, and negative pole is connected with contrast electrode.
7. a method of carrying out zinc-plated measurement examination with multi-functional tin plate sheet surface characteristic test device, is characterized in that: comprises the steps,
Step 1, sample is carried out to chemical degreasing;
Step 2, zinc-plated amount detect;
Step 2.1, sample is put into electrolytic tank;
Step 2.2: tester cuts out electrolytic tank;
Step 2.3, tester add electrolytic tank by hydrochloric acid, until fill it up with, stop liquid feeding;
Step 2.4, at sample and two contrast electrodes, add default steady current simultaneously; Start electrolysis detin reaction;
Step 2.5, the voltage of sample and two test electrodes is carried out to record, and measure terminal computing judgement; Until the feature current potential that the detin of reflection sample completes occurs;
After step 2.6, feature current potential occur, stop test, disconnect steady current, and open reactive tank, emptying hydrochloric acid
Step 2.7, according to current value, the time that feature current potential occurs, examination is supported and the area equivalent calculation of hydrochloric acid contact reaction part goes out zinc-plated amount.
8. the method that the multi-functional tin plate sheet surface characteristic test device of use according to claim 7 carries out zinc-plated measurement examination; It is characterized in that: also comprise the computing method of measuring terminal:
First the data that gather are carried out to arithmetic mean filtering algorithm, and introduce formula
, wherein, N=3, xi is efficiently sampling data.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699360A (en) * | 2014-11-27 | 2016-06-22 | 上海梅山钢铁股份有限公司 | Method for rapid determination of lead content of tin plate coating |
| CN108085738A (en) * | 2016-11-22 | 2018-05-29 | 上海宝钢工业技术服务有限公司 | The sample pretreatment device and method of tin plate alloy-tin galvanic couple experiment |
| CN111141797A (en) * | 2019-12-25 | 2020-05-12 | 东北大学 | Method for evaluating surface passivation film characteristics of tin plate based on semiconductor properties |
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| CN108085738A (en) * | 2016-11-22 | 2018-05-29 | 上海宝钢工业技术服务有限公司 | The sample pretreatment device and method of tin plate alloy-tin galvanic couple experiment |
| CN111141797A (en) * | 2019-12-25 | 2020-05-12 | 东北大学 | Method for evaluating surface passivation film characteristics of tin plate based on semiconductor properties |
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Application publication date: 20140910 |