基于微电容检测技术的数控切割机自动调高系统研究.pdf

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1、机床与液压Sep．2014HydromechatronicsEngineeringVo1．42No．18DOI：10．3969／j．issn．1001-3881．2014．18．016MicrocapacitancedetectingtechnologyresearchforheightautomaticadjustmentsystemofCNCcuttingmachineAi．chengZOU，Qun—yingWANG，YunZHANGGuilinUniversityofAerospaceTechnology，Guilin541004，ChinaAbstract：Thepaper

2、analyzedtherequirementsofCNCcutingmachineheightautomaticadjust-mentsystem．Andwedesignedasuitablemicrocapacitancedetectioncircuit．Theoreticalanaly。sisandexperimentalresultsshowthatthecircuithasgoodabilitytosuppressnoiseandstrayca。pacitance．Keywords：CNCcuttingmachine，Heightautomaticadjustmentsys

3、tem，Capacitance1．Introduction2．MicrocapacitancedetectioncircuitCNCcuttingmachinehasbeenwidelyusedin2．1．Overallblockdiagramofcircuitmanufacturingindustry．Inordertoimprovethecut—Overallblockdiagramofthemicrocapacitancetingqualityandreducewastegeneration，theheightdetectioncircuitisshowninFigure1．

4、Thesineexci—betweencuttingtorchandthematerialtobepro-tationsourcesignal(V1)，generatedbythesinewavecessedmustalwayskeepingthesettingvalueinthegeneratingcircuit，afterprocessedbycalculationca。cuttingprocess[1]．Butbecausethetemperaturepacitancedetectioncircuitbecamethesinewavesig—nearthetorchisver

5、yhigh，ordinarysensorscannotnal()．ThefrequencyofisequaltoV1，andthebeused，soitneedstodesignanewheightsensoramplitudeofisproportionaltothevalueofthedevice．Afeasiblemethodistoplaceasteelplanarheightbetweenthetorchandmaterialtobepro—inductiveringwhichcanwithstandhightemperaturecessed．Afterprocessed

6、bythephasedetectioncir-nearthetorch．Thecapacitancewhichusuallyverysmallbetweentheringandthemateria1tobepro—cult，becameDCvoltagesignal(Vo1)，whoseam—plitudeisequalto．Thencangettheheight．cessedcancharacterizetheheightofwhichits[2—3]．Thatcanbeexpressedas：sinewavelVC：teacltciuon!atCioirncuitlDete船。

7、Cx=6S／dx(1)GeCnieratingt--apacitance‘。。一ction+Where．8isthedielectricconstantbetweentorchandrcuitlDircuitlmaterialtobeprocessed．Sisthesizeofring．Figure1．OverallblockdiagramofcircuitThispaperdesignedadetectioncircuitformeas。uringthemicroc