生物樣品研磨機(jī)理研究.pdf

1、華中農(nóng)業(yè)大學(xué)碩士學(xué)位論文生物樣品研磨機(jī)理研究姓名：李松山申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：農(nóng)業(yè)機(jī)械化工程指導(dǎo)教師：伍冬生朱松德2002.5.1AbstractThe21thcenturyisthecenturyofthescienceoflifeTheworldiscolorfulbecauseoftheexistinglives，whoseprocessesincludebeingborn，growth，illnesseventhedeathi

2、scontrolledbygeneThelinearorderofthechainofDNAorRNAhastheinformationoflifeEventhethoughtsandintelligenceofadvancedmammalandhumanbeinghaverelationswiththeirgeneSomallistryinghisbesttocarryoutthemagnificentplanofgenereorga

3、nizationtounderstandandoptimizethelifeBeforeextractingDNAorRNA，thesampleshavetobegdndedfirstButinchinathisworkisdonebyhandItnotonlyisadullworkbutalsowastesmuchtimeoftheresearcherThepapermajoredinhowtogetanefficient，econo

4、myandmechanicalwaytotaketheplaceofhandInourcountrythereisnospecialmachineforgrindingmaterialThebeadissuitableforgrindingthematerialItisbasedonthecharacteristicofthematerialThepaperdiscussedsomeimportantaspectsaboutthegri

5、ndingmachine，andthemajorwastheinfluencetoaveragediameterofthegrindedmaterialandthegrindingtimeafterchangingthevolumeofthegrindingeontainerthesizeandthenumbersofthebeads，thespeedoftheelectromotorthevolumeofthematerial，and

6、thelengthofthecrankThroughthesinglefactoranalysis，wecanfindtheimportantfactorswhichinfluencetheaveragediameterofthegrindedmaterialOnthebasisofit，theorthogonaltestiscarriedout，findingoutthatthenotablefactorsincluded：thevo

7、lumeofthecontainerthespeedoftheelectromotorthetotalvolumeofbeadswhicharemixedindifferentsizes，andthegrindingtimeSothemathematicalmodelcanbesetupasfollows：多=0284—37810～zl1743x10—622—3615910～z，一5I101zlz2w471410’522l13IIO”Z

8、22ZIstandsforthevolumeofthecontainerZ2standsforthetotalvolumeofthebeads，Z3standsforthegrindingtime，andtherearemutualinfluencebetweenZiandZ2Fromtheabovemodel，aconclusioncanbedrawnthatthediameterofthecontainerisfrom50to100

9、mm，andthetotalvolumeofthebeadsisfrom33870to135481Into3，andthegrindingtimeisfrom20to40secondsontheconditionthattheaveragediameterislessthan015834toniThebestoptimumconditionisthatthediameterofthecontaineris75mm，andthetotal

10、volumeofthebeadsis64000mm3，andthegrindingtimeis30secondsontheconditionthattheaverageis1essthanO0】mmSothatsomevaluableprimarymachineryandrealapplicationKeywords：grinding，averagegrindingtheoryandpracticebasesfordesignofdia