Nyob rau hauv lub realm ntawm ceev ceev -paced industrial automation, qhov sib txawv ntawm ib tug muaj tseeb kev sib dhos kab thiab kev tu ncua tsis tu ncua teeb meem feem ntau hinges ntawm ob peb microns ntawm nto zoo. Cov tshuab pneumatic niaj hnub, uas paub txog lawv txoj kev txav nrawm thiab rov ua dua, tso kev ntxhov siab rau cov ntsaws ruaj ruaj. Thaum lub tog raj kheej pneumatic tsis ua haujlwm rau lub sijhawm, lub elastomer adheres rau qhov chaw tiv tauj, ua rau muaj qhov xwm txheej hu ua Stick-Slip Effect.
Yog tias qhov sib txhuam coefficient tsis raug tswj kom zoo, lub kaw lus tau ntsib "stiction"- nrawm nrawm thaum pib ua haujlwm uas ua rau muaj qhov tsis raug, kev kub ntxhov ntau dhau, thiab kev hnav thaum ntxov ntawm daim di ncauj sealing. Rau engineers, zoo tswj dynamic sealing yuav tsum tau ib tug meej tuav ntawm tribological kev sib tshuam ntawm lub elastomer thiab cov hlau nto tiav.
Txhais qhov Coefficient of Friction (CoF) hauv Elastomers
Hauv cov ntsiab lus engineering, lubCoefficient ntawm kev sib txhuam (μ)yog qhov sib piv ntawm lub zog ntawm kev sib txhuam ntawm ob lub cev rau lub zog nias lawv ua ke. Txawm li cas los xij, hauv kev tshawb fawb polymer, peb yuav tsum paub qhov txawv ntawm ob theem tseem ceeb:
Breakout Friction (Static):Thawj lub zog yuav tsum tau kov yeej cov molecular adhesion ntawm lub foob thiab lub tog raj kheej phab ntsa. Qhov no feem ntau yog qhov siab tshaj qhov kev sib txhuam vim yog qhov viscoelastic ntawm cov roj hmab, uas tso cai rau nws ntws mus rau hauv cov kwj deg ntawm cov mating nto lub sijhawm.
Kev sib txhuam (Kinetic):Lub zog tau ntsib thaum lub sijhawm txav mus tas li.
Nyob rau hauv siab -pneumatic distributor, ib tug siab breakout kev sib txhuam ua rau ib tug "teb lus lag." Lub kaw lus xav tau ntau lub zog los pib txav dua li nws ua kom txav mus, ua rau muaj qhov tsis ruaj khov, oscillating cov lus tsa suab uas tuaj yeem ua rau puas tsuaj rau cov khoom siv hlau.
Lub hauv paus ntsiab lus: Viscoelasticity thiab Hydrodynamic Lubrication
Roj hmab kev sib txhuam yog tshwj xeeb vim nws muaj ob yam:adhesionthiabdeformation. Adhesion tshwm sim nyob rau theem molecular qhov twg elastomer chains bond nrog lub mating nto. Kev sib txhuam deformation tshwm sim thaum cov roj hmab "plows" los ntawm qhov roughness ntawm lub tog raj kheej.
Txhawm rau txhim kho kev ua tau zoo, peb tsom mus rau qhovMicro{0}}geometryntawm lub foob nto. Los ntawm engineering ib qho kev ntxhib los mos ntawm qhov chaw, lub foob ua raws li lub microscopic reservoir rau lubrication. Raws li lub foob txav ntawm kev kub ceev, nws rub cov roj nplua nyeem los ntawm cov hav no, tsim kom muaj ib qhoHydrodynamic Lubrication Zaj duab xis. Cov zaj duab xis nyias ntawm cov roj los yog cov roj no cais cov roj hmab los ntawm cov hlau, zoo hloov "khoom- rau- khoom" kev sib txhuam nrog "kua" kev sib txhuam, uas yog qhov kev txiav txim siab qis dua.
Material Innovations rau qis-Kev sib txhuam ua haujlwm
NtawmQINGDAO BRIGHT RUBBER & Plastics CO., LTD, peb siv peb lub tswv yim tseem ceeb los txo kev sib txhuam thiab tiv thaiv kev sib txhuam:
Internal Lubrication (Low-Kev sib txhuam NBR):Peb tsim cov tshuaj Nitrile (NBR) nrog cov khoom siv sab hauv xws li graphite, molybdenum disulfide (MoS2), los yog PTFE micro{0}} hmoov. Raws li lub foob hnav me ntsis thaum nws lub neej ua haujlwm, cov roj nplaum no txav mus rau qhov chaw, muab qhov txuas ntxiv, tus kheej -lubricating interface.
PTFE Cap Seals (Rubber / PTFE Composites):Rau cov ntawv thov uas xav tau nyob ze -zero stiction, peb siv cov qauv tsim. PTFE (Polytetrafluoroethylene) swb nplhaib tuav lub dynamic interface, thaum lub nplhaib elastomeric O-nplhaib muab qhov tsim nyog "energizing" quab yuam kom tuav lub foob. Qhov no suav nrog lub ntiaj teb-chav kawm tsis tshua muaj kev sib txhuam ntawm PTFE nrog lub cim xeeb elastic ntawm NBR lossis FKM.
Kev kho deg (Halogenation):Txhawm rau txo qhov "tackiness" ntawm cov roj hmab, peb sivHalogenation(feem ntau yog chlorination). Cov txheej txheem no hloov cov qauv molecular ntawm lub foob nto, ua rau nws hardness thiab txo lub zog saum npoo. Qhov tshwm sim yog qhov "slick" nto uas tiv thaiv kev ua haujlwm txawm tias tom qab lub sijhawm tsis ua haujlwm ntev.
Specifications: Qhov sib npaug ntawm Nto Roughness thiab Hardness
Lub efficiency ntawm ib tug dynamic foob yog heev nyob ntawm seb mating nto tiav. Peb pom zoo ibNto Roughness (Ra)ntawm0.1 rau 0.4μmrau lub tog raj kheej bore los yog pas nrig.
Yog hais tias qhov saum npoo yog du heev (Ra<0.1μm):Cov zaj duab xis lubrication tsis tuaj yeem tsim, ua rau lub tshuab nqus tsev -zoo li nqus cov nyhuv uas ua rau muaj kev sib txhuam ntau heev.
Yog hais tias qhov saum npoo yog ntxhib heev (Ra>0.4μm):Lub ncov ntawm cov hlau nto ua haujlwm zoo li cov ntaub ntawv, sai sai abrading lub sealing di ncauj thiab ua rau to.
Tsis tas li ntawd,Hardness( ntsuas hauv Shore A) ua lub luag haujlwm tseem ceeb. Ib qho nyuaj dua (piv txwv li, 85 Shore A) nthuav tawm thaj tsam me me nyob rau hauv siab, uas feem ntau txo tag nrho kev sib txhuam. Txawm li cas los xij, nws yuav tsum muaj kev cuam tshuam ntau dua los tuav lub foob, uas tuaj yeem ua rau muaj kev ntxhov siab hauv zos. Peb feem ntau sib npaug cov ntsiab lus no los ntawm kev tsom mus rau 70-80 Shore A ntau yam rau feem ntau cov ntawv siv pneumatic.
Daim ntawv thov Scenario rau siab -Dynamic Seals
Siab -Speed Pneumatic Sliders:Qhov tseem ceeb rau kev xaiv-thiab- tso cov neeg hlau uas lub sij hawm voj voog raug ntsuas hauv milliseconds.
Industrial Automation Robotic Arms:Cov ntsaws ruaj ruaj nyob rau hauv cov pob qij txha thiab cov actuators yuav tsum muab lub zog sib xws kom ntseeg tau tias du, tib neeg -zoo li cov lus tsa suab.
Siab -Frequency Hydraulic/Pneumatic Distributors:Qhov twg lub valve spool yuav tsum hloov ntau txhiab zaus hauv ib teev yam tsis muaj "sticking" hauv qhov qhib lossis kaw.
Xaus
Mastering dynamic sealing tsis yog tsuas yog xaiv cov khoom siv; Nws yog hais txog engineering ib tribological system. Los ntawm kev sib txuas tshwj xeeb NBR / PTFE composites nrog kev kho saum npoo zoo li halogenation,QINGDAO BRIGHT RUBBER & Plastics CO., LTDpab cov tuam txhab tshem tawm cov nplaum - cov nyhuv plam thiab txuas ntxiv lub neej kev pab cuam ntawm lawv cov tshuab ua haujlwm.
Yog tias koj cov kab ntau lawm tab tom muaj kev cuam tshuam tsis zoo lossis tsis ua haujlwm ntxov ntxov, tiv tauj peb pab pawg engineering. Peb muab kev kuaj CoF kev cai thiab cov khoom siv kom zoo kom ntseeg tau tias koj lub tshuab pneumatic ua haujlwm nrog qhov siab tshaj plaws thiab kev sib txhuam tsawg kawg nkaus.
