CN1332207C - Device for measuring electrical double layer streaming potential in thin-film lubrication - Google Patents
Device for measuring electrical double layer streaming potential in thin-film lubrication Download PDFInfo
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- CN1332207C CN1332207C CNB2005100334751A CN200510033475A CN1332207C CN 1332207 C CN1332207 C CN 1332207C CN B2005100334751 A CNB2005100334751 A CN B2005100334751A CN 200510033475 A CN200510033475 A CN 200510033475A CN 1332207 C CN1332207 C CN 1332207C
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- electrokinetic potential
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Abstract
The present invention relates to a device for measuring double electrical layer streaming potential in thin-film lubrication, which comprises a thin-film lubrication experiment table and a streaming potential measuring device, wherein the thin-film lubrication experiment table comprises an AC motor, a disc, a combined slide block, a weighting block, a bracket and a base; the disc is driven by the AC motor; the disc and the bracket are fixed on the base; the combined slide block is arranged at one end of a cross beam of the bracket; the combined slide block is arranged on the disc; the weighting block is arranged on the upper side of the combined slide block; the streaming potential measuring device comprises an amplifying circuit, an AD transition card, a computer, a conducting wire and electrodes; the electrodes are arranged on both ends of the combined slide block; the electrodes are connected with the input end of the amplifying circuit through the conducting wire; the output end of the amplifying circuit is connected to the AD transition card; the AD transition card is connected with the computer. The present invention utilizes a data collection program in the computer to realize the data collection of streaming potential, adopts the two-stage amplifying circuit, greatly improves measurement precision and is suitable for the measurement of the double electrical layer streaming potential in the state of the thin-film lubrication.
Description
Technical field
The invention belongs to electrostatic double layer electrokinetic potential field of measuring technique in the composite lubricating film, relate in particular to the device of the lubricated middle electrostatic double layer electrokinetic potential of a kind of MEASUREMENTS OF THIN.
Background technology
The electrostatic double layer effect shows as acting force between electroviscosity and electrostatic double layer in film lubrication, the film lubrication performance is had apparent in view influence.In the ordinary course of things, the electrostatic double layer effect mainly shows as electroviscosity, and promptly the electrostatic double layer electroviscosity obviously increases the equivalent viscosity of fluid.
In the parameter of describing electrostatic double layer, electrostatic double layer thickness and electrostatic double layer electromotive force are very important parameters.In lubricated district, it is very difficult accurately measuring the electrostatic double layer electromotive force.At present, after mainly method is measured electrokinetic potential by experiment, obtain the electrostatic double layer electromotive force indirectly by formula calculating.Therefore the measurement of electrostatic double layer electrokinetic potential just seems very important for research electrostatic double layer effect to the film lubrication Effect on Performance, and its measuring accuracy will directly have influence on the precision of the electrostatic double layer electromotive force that calculates gained.
At present, domestic and international research for Electric Double Layer on Thin Film Lubrication is in theoretical research stage substantially.Great majority research is the film lubrication mathematics physics model of considering the electrostatic double layer effect by setting up, derives the formula of electrostatic double layer electrokinetic potential, carries out numerical analysis then.The experimental study aspect is then less relatively.Mainly be to utilize sensor technology that electrokinetic potential is measured.Generally, the device more complicated of measurement, cost is higher, and prior art only is that electrostatic double layer electrokinetic potential under the convection cell hydrodynamic lubrication state is measured, and the measuring method of the electrokinetic potential under the Condition of Thin Film Lubrication is lacked further investigation.
Summary of the invention
The object of the present invention is to provide the device of the lubricated middle electrostatic double layer electrokinetic potential of a kind of MEASUREMENTS OF THIN.The side electrode device of this device design has solved the main difficult point of electrostatic double layer research under the film lubrication condition preferably, can realize measurement to the electrostatic double layer electrokinetic potential, and the present invention adopts the two-stage amplifying circuit ultra-weak electronic signal of electrokinetic potential can be amplified enough multiples, carry out computer sampling then, measuring accuracy can improve greatly.
The device of electrostatic double layer electrokinetic potential comprised two parts during MEASUREMENTS OF THIN of the present invention was lubricated: film lubrication experiment table and electrokinetic potential measurement mechanism, the film lubrication experiment table comprises AC motor, disk, composite slider, weight, support and base, and disk is driven by AC motor; Be fixed with disk and support on the base, an end of rack beam is equipped with composite slider, and composite slider is on the disk, and weight is arranged above the composite slider; The electrokinetic potential measurement mechanism comprises amplifying circuit, AD transition card, computing machine, lead and electrode, be equipped with electrode at the composite slider two ends, electrode connects with the input end of amplifying circuit by lead, the output terminal of amplifying circuit is connected to the AD transition card, the AD transition card links to each other with computing machine, utilizes the data acquisition of the data acquisition program realization electrokinetic potential in the computing machine.
Adopt gear drive between disk and the AC motor.
Described amplifying circuit is the amplifying circuit of being made up of the AD620 chip, have three the tunnel, the left side is that input signal inserts, the right connects the AD transition card for output signal, preceding two-way is the one-level amplifying circuit, as subsidiary function, can measure other any ultra-weak electronic signals except that electrokinetic potential, last road is the two-stage amplifying circuit, is used for measuring the electrostatic double layer electrokinetic potential.
Data acquisition program of the present invention is the program based on the DOS interruption of writing with TC, gathers when can realize four road input signals and the output of one tunnel control signal, and the sample frequency of its acquiescence is 40Hz, can adjust as required, and once Cai Yang time is 60s.
Described support is the level type cross frame.
The present invention compared with prior art has following advantage and beneficial effect:
1) electrode assembly of the present invention's design has solved the main difficult point of electrostatic double layer research under the film lubrication condition preferably, can realize the measurement to the electrostatic double layer electrokinetic potential;
2) because the numerical value of electrokinetic potential is very little, if directly measure, error is just bigger, and the present invention adopts the two-stage amplifying circuit ultra-weak electronic signal of electrokinetic potential can be amplified enough multiples, carries out computer sampling then, and measuring accuracy improves greatly;
3) amplifying circuit of apparatus of the present invention has three road circuit, and except measuring electrokinetic potential, remaining two-way circuit can be measured other any ultra-weak electronic signal, as the friction factor of film lubrication etc.;
4) the present invention is simple to operate, and is with low cost, for research electrostatic double layer effect film lubrication Effect on Performance mechanism had crucial meaning.
Description of drawings
Fig. 1 is the general structure synoptic diagram of apparatus of the present invention;
Fig. 2 is the structural representation that electrostatic double layer electrokinetic potential of the present invention is measured;
Fig. 3 is a circuit draw bail synoptic diagram of the present invention.
Among the figure: 1-AC motor 2-disk 3-composite slider 4-weight 5-support 6-base 7-amplifying circuit 8-AD transition card 9-computing machine 10-lead 11-electrode 12-electrostatic double layer 13-composite lubricating film
Embodiment
In order to understand the present invention better, the present invention is done to describe further below in conjunction with accompanying drawing.
As Fig. 1, Fig. 2 and shown in Figure 3, the present invention includes two parts: film lubrication experiment table and electrokinetic potential measurement mechanism, the film lubrication experiment table comprises AC motor 1, disk 2, composite slider 3, weight 4, support 5 and base 6, disk 2 is driven by AC motor 1, adopt gear drive between the two, be fixed with disk 2 and support 5 on the base 6, an end of support 5 crossbeams is equipped with composite slider 3, composite slider 3 is on the disk 2, and weight 4 is arranged above the composite slider 3; The electrokinetic potential measurement mechanism comprises amplifying circuit 7, AD transition card 8, computing machine 9, lead 10 and electrode 11, be equipped with electrode 11 at composite slider 3 two ends, electrode 11 connects with the input end of amplifying circuit 7 by lead 10, the output terminal of amplifying circuit 7 is connected to AD transition card 8, AD transition card 8 links to each other with computing machine 9, utilizes the data acquisition of the data acquisition program realization electrokinetic potential in the computing machine 9.
Amplifying circuit 7 is the amplifying circuit of being made up of the AD620 chip, have three the tunnel, the left side is that input signal inserts, the right connects AD transition card 8 for output signal, preceding two-way is the one-level amplifying circuit, as subsidiary function, can measure other any ultra-weak electronic signals except that electrokinetic potential, last road is the two-stage amplifying circuit, is used for measuring the electrostatic double layer electrokinetic potential.
Data acquisition program of the present invention is the program based on the DOS interruption of writing with TC, gathers when can realize four road input signals and the output of one tunnel control signal, and the sample frequency of its acquiescence is 40Hz, can adjust as required, and once Cai Yang time is 60s.
During measurement, between disk 2 and composite slider 3, add a certain amount of lubricant, weight 4 on composite slider 3 applies certain load, start AC motor 1 then, driving disk 2 rotates, so between disk 2 and composite slider 3, form film lubrication district (comprising electrostatic double layer 12 and composite lubricating film 13), adjust the rotating speed of disk 2, when the stabilization of speed of disk 2 begins to carry out the electrokinetic potential sampled measurements later on, measurement result is transported on the AD transition card 8 by amplifying circuit 7, because AD transition card 8 links to each other with computing machine 9, computing machine 9 carries out the electrokinetic potential data acquisition with regard to the log-on data capture program like this.
As mentioned above, can realize the present invention preferably.
The present invention adopts the two-stage amplifying circuit, and the enough multiples of ultra-weak electronic signal amplification with electrokinetic potential carry out computer sampling then, and measuring accuracy improves greatly.
Claims (6)
1. the device of electrostatic double layer electrokinetic potential during a MEASUREMENTS OF THIN is lubricated, it is characterized in that comprising two parts: film lubrication experiment table and electrokinetic potential measurement mechanism, the film lubrication experiment table comprises AC motor, disk, composite slider, weight, support and base, and disk is driven by AC motor; Be fixed with disk and support on the base, an end of rack beam is equipped with composite slider, and composite slider is on the disk, and weight is arranged above the composite slider; The electrokinetic potential measurement mechanism comprises amplifying circuit, AD transition card, computing machine, lead and electrode, be equipped with electrode at the composite slider two ends, electrode connects with the input end of amplifying circuit by lead, the output terminal of amplifying circuit is connected to the AD transition card, the AD transition card links to each other with computing machine, utilizes the data acquisition of the data acquisition program realization electrokinetic potential in the computing machine.
2. the device of electrostatic double layer electrokinetic potential is characterized in that adopting gear drive between described disk and the AC motor during MEASUREMENTS OF THIN according to claim 1 was lubricated.
3. the device of electrostatic double layer electrokinetic potential during MEASUREMENTS OF THIN according to claim 1 is lubricated is characterized in that the two-stage amplifying circuit of described amplifying circuit for being made up of the AD620 chip.
4. the device of electrostatic double layer electrokinetic potential during MEASUREMENTS OF THIN according to claim 3 is lubricated, it is characterized in that described amplifying circuit has three the tunnel, the left side is that input signal inserts, and the right is that output signal connects the AD transition card, preceding two-way is the one-level amplifying circuit, as subsidiary function; Last road is the two-stage amplifying circuit, is used for measuring the electrostatic double layer electrokinetic potential.
5. the device of electrostatic double layer electrokinetic potential during MEASUREMENTS OF THIN according to claim 1 is lubricated, it is characterized in that described data acquisition program is the program based on the DOS interruption of writing with TC, gather when can realize four road input signals and the output of one tunnel control signal.
6. the device of electrostatic double layer electrokinetic potential is characterized in that described support is the level type cross frame during MEASUREMENTS OF THIN according to claim 1 was lubricated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100334751A CN1332207C (en) | 2005-03-11 | 2005-03-11 | Device for measuring electrical double layer streaming potential in thin-film lubrication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100334751A CN1332207C (en) | 2005-03-11 | 2005-03-11 | Device for measuring electrical double layer streaming potential in thin-film lubrication |
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| Publication Number | Publication Date |
|---|---|
| CN1664593A CN1664593A (en) | 2005-09-07 |
| CN1332207C true CN1332207C (en) | 2007-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100334751A Expired - Fee Related CN1332207C (en) | 2005-03-11 | 2005-03-11 | Device for measuring electrical double layer streaming potential in thin-film lubrication |
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| CN (1) | CN1332207C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| PL2939980T3 (en) * | 2014-04-30 | 2018-08-31 | Omya International Ag | Production of precipitated calcium carbonate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6023661A (en) * | 1996-10-18 | 2000-02-08 | Bristol-Myers Squibb Company | Streaming potential system and method |
| CN2636251Y (en) * | 2003-06-20 | 2004-08-25 | 武汉科技大学 | Voltage/current on-line monitor |
| CN1547090A (en) * | 2003-12-03 | 2004-11-17 | 中国科学院昆明动物研究所 | Artificial intelligence brain electricity collection and analysis system |
-
2005
- 2005-03-11 CN CNB2005100334751A patent/CN1332207C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6023661A (en) * | 1996-10-18 | 2000-02-08 | Bristol-Myers Squibb Company | Streaming potential system and method |
| CN2636251Y (en) * | 2003-06-20 | 2004-08-25 | 武汉科技大学 | Voltage/current on-line monitor |
| CN1547090A (en) * | 2003-12-03 | 2004-11-17 | 中国科学院昆明动物研究所 | Artificial intelligence brain electricity collection and analysis system |
Non-Patent Citations (1)
| Title |
|---|
| 双电层电粘度对薄膜润滑影响的试验研究和数值分析 白少先 黄平，机械工程学报，第40卷第5期 2004 * |
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| CN1664593A (en) | 2005-09-07 |
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