Elastic Modulus Matching Technology rau Rail Pads thiab taug qab kev vibration thiab suab nrov txo kev daws teeb meem
Dab tsi yog qhov tseem ceeb cuam tshuam rau lub elastic modulus hauv qab -rail pads?
Cov ntsiab lus tseem ceeb cuam tshuam ntawm elastic modulus ntawm hauv qab -rail pads suav nrogCov khoom siv mis, vulcanization txheej txheem thiab cov qauv tsim. Cov khoom siv mis yog lub hauv paus rau kev txiav txim siab elastic modulus. Rau cov ntaub qhwv raws li ethylene propylene diene monomer (EPDM), lub elastic modulus tuaj yeem hloov tau los ntawm kev kho cov pa roj carbon dub filling. Thaum cov pa roj carbon dub filling ntau tau nce los ntawm 30 qhov chaw mus rau 60 qhov chaw, qhov elastic modulus tuaj yeem nce ntau dua 50%. Lub vulcanization kub thiab lub sij hawm nyob rau hauv cov txheej txheem vulcanization kuj cuam tshuam rau elastic modulus. Thaum lub vulcanization kub tswj ntawm 150-160℃thiab lub sij hawm vulcanization yog 15-20 feeb, lub crosslinking ceev ntawm lub ncoo yog nruab nrab thiab elastic modulus yog ruaj khov; Qhov kub thiab txias ntau dhau los yog lub sij hawm ntev dhau lawm yuav ua rau muaj kev sib txuas ntau dhau, ua rau lub ncoo nyuaj thiab nkig nrog lub siab elastic modulus. Nyob rau hauv cov nqe lus ntawm cov qauv tsim, hollow pads nrog grooves los yog puag ncig qhov muaj ib tug elastic modulus 10% -20% qis dua li cov ntaub ntawv, vim hais tias cov hollow qauv yuav ua rau kom lub deformation ntawm lub ncoo thiab txo tag nrho cov nruj. Tsis tas li ntawd, lub ambient kub kuj yuav cuam tshuam rau elastic modulus. Cov ntaub qhwv ntsej muag yuav ntsws thiab tawv nqaij nyob rau hauv qhov kub thiab txias ib puag ncig, ua rau elastic modulus; cov khoom yuav soften nyob rau hauv qhov kub thiab txias ib puag ncig, txo cov elastic modulus. Yog li ntawd, cov qauv yuav tsum tau hloov kho raws li kev nyab xeeb ntawm thaj chaw uas cov kab nyob.
Yuav ua li cas yog cov elastic modulus txuam yuav tsum tau nyob rau hauv -rail pads nyob rau hauv siab - ceev railways?
Cov kev xav tau ntawm elastic modulus piv rau hauv qab -rail pads hauv siab - kev tsheb ciav hlau ceev yogsib npaug siab elasticity thiab siab stability. Lub elastic modulus yuav tsum tau tswj ntawm 80-120MPa. Qhov ntau yam no tuaj yeem tsis tsuas yog ua kom lub ncoo muaj qhov elasticity txaus los nqus lub zog vibration uas tsim los ntawm kev ua haujlwm siab - lub tsheb ciav hlau ceev thiab txo lub log- tsheb ciav hlau lub suab nrov, tab sis kuj zam dhau qhov deformation ntawm lub ncoo thiab xyuas kom ruaj khov geometric txoj hauj lwm ntawm txoj kev tsheb ciav hlau. High{10}} txoj kev tsheb ciav hlau ceev muaj qhov xav tau ntau dua rau qhov kev hloov pauv hloov pauv hloov pauv ntawm lub ncoo. Qhov piv ntawm dynamic elastic modulus rau zoo li qub elastic modulus yuav tsum tau tswj ntawm 1.2 thiab 1.5, kom ntseeg tau tias elastic kev ua tau zoo ntawm lub ncoo yuav tsis muaj zog attenuated nyob rau hauv siab - zaus vibration load. Nyob rau tib lub sijhawm, elastic modulus ntawm lub ncoo yuav tsum muaj kev laus zoo. Raws li kev nqis tes ua ntawm ib puag ncig ib puag ncig xws li ultraviolet rays thiab dej nag, qhov kev hloov pauv ntawm elastic modulus nyob rau hauv 5 xyoo yuav tsum tsawg dua los yog sib npaug li 10% los xyuas kom meej qhov ntev -lub sij hawm ruaj khov kev co txo cov nyhuv ntawm txoj kab. Tsis tas li ntawd, nyob rau hauv -rail pad rau high-speed railways yuav tsum tau txais cov txheej txheem tsim. Cov txheej sab saud yog cov txheej txheem qis qis (80-90MPa), uas yog nyob rau hauv kev sib cuag ncaj qha nrog txoj kev tsheb ciav hlau thiab ua lub luag haujlwm tseem ceeb ntawm kev co; Cov txheej hauv qab yog cov txheej txheem siab elastic (100-120MPa), uas yog nyob rau hauv kev sib cuag nrog cov neeg pw tsaug zog los txhim kho cov kabmob muaj peev xwm. Qhov sib txuam ntawm elastic modulus yog pom tau los ntawm txheej txheej tsim.
Dab tsi yog cov ntsiab lus ntawm kev tiv thaiv - compression teeb tsa tshuab rau hauv qab - tsheb ciav hlau pads hauv hnyav - tsheb ciav hlau?
Cov ntsiab lus tseem ceeb ntawm kev tiv thaiv - compression teeb tsa thev naus laus zis rau hauv qab - tsheb ciav hlau hauv cov hnyav - tsheb ciav hlau yogtxhim kho qhov qaug zog tsis kam thiab creep kuj ntawm cov khoom. Ua ntej, xaivsiab - hnav- tiv taus thiab siab - elastic styrene -butadiene roj hmab (SBR) thiab cov roj hmab ntuj (NR) sib xyawnrog kev sib xyaw ua ke ntawm 7: 3. Kev sib xyaw ua ke no tuaj yeem sib npaug ntawm elasticity thiab tiv thaiv -compression deformation peev xwm ntawm cov khoom. Ntxiv los tiv thaiv- tus neeg saib xyuas kev laus thiab tus neeg sawv cev ntxiv rau cov khoom siv mis. Xaiv 4010NA ua tus neeg sawv cev tiv thaiv- kev laus nrog qhov ntxiv ntawm 2 ntu kom ncua cov khoom laus; xaiv silica raws li tus neeg sawv cev txhawb nqa nrog qhov sib ntxiv ntawm 40 qhov chaw txhawm rau txhim kho qhov sib txuas ntawm lub zog ntawm cov roj hmab molecular chains thiab txhim kho lub peev xwm los tiv thaiv -compression deformation. Cov txheej txheem vulcanization adopts aob -theem vulcanization txheej txheem. Thawj - theem vulcanization kub yog 145℃rau 12 feeb, thiab qhov thib ob -stage vulcanization kub yog 100℃rau 4 teev. Lub crosslinking ceev ntawm cov khoom yog ntxiv txhim kho los ntawm ob -theem vulcanization, thiab compression teem tus nqi yog txo, uas yuav tsum tau tsawg tshaj li los yog sib npaug rau 25% (70℃× 22h × 25% compression tus nqi). Tsis tas li ntawd, cov qauv tsim ntawm lub ncoo adopts ib qhoarc qauv nrog tuab nruab nrab thiab nyias npoo, nrog nruab nrab tuab ntawm 20mm thiab ntug thickness ntawm 15mm. Cov qauv arc tuaj yeem cuam tshuam cov ntsiab lus hnyav ntawm cov tsheb ciav hlau hnyav- thiab txo qis hauv zos compression deformation ntawm lub ncoo. Nyob rau tib lub sijhawm, tiv thaiv - cov kab kab kab sib txuas nrog qhov siab ntawm 2 hli tau teeb tsa hauv qab ntawm lub ncoo txhawm rau txhim kho kev sib txhuam ntawm lub ncoo thiab cov neeg pw tsaug zog thiab tiv thaiv lub ncoo los ntawm kev swb.
Yuav ua li cas yog lub suab nrov txo optimization txoj kev tsim rau hauv qab -rail pads nyob rau hauv lub nroog rail transit?
Lub suab nrov txo qhov ua kom zoo tshaj plaws tsim qauv rau hauv qab - tsheb ciav hlau pads hauv nroog tsheb ciav hlau yogtxo lub log-rail hu suab nrov los ntawm ob qho tib si khoom thiab cov qauv. Hais txog cov khoom siv,damping cov khoom siv roj hmabnrog rau qhov damping yam Ntau dua lossis sib npaug ntawm 0.3 raug xaiv. Damping roj hmab tuaj yeem hloov kev vibration zog rau hauv lub zog cua sov thiab dissipate nws, thiab nws cov suab nrov txo cov nyhuv yog 15% -20% siab dua li cov roj hmab zoo tib yam. Ntxiv suab rwb thaiv tsev muab tub lim xws li vermiculite hmoov nrog ib qho ntxiv ntawm 15 qhov chaw rau cov khoom. Cov txheej txheej txheej ntawm vermiculite hmoov tuaj yeem cuam tshuam lub suab yoj tawm thiab ntxiv txhim kho lub suab nrov txo. Hais txog tus qauv, antxeem tau honeycomb qauvyog saws nrog ib tug honeycomb aperture ntawm 5 hli thiab ib lub qhov nrug ntawm 8 hli. Cov qauv honeycomb tuaj yeem ua rau muaj qhov cuam tshuam ntawm lub suab tsis zoo hauv lub ncoo, siv lub zog nthwv dej thiab txo cov suab nrov. Tib lub sijhawm,arc groovesnrog rau qhov tob ntawm 3 hli thiab qhov dav ntawm 10 hli yog teem rau ntawm lub ncoo nto. Lub arc grooves tuaj yeem hloov pauv kev nthuav tawm ntawm lub log - kev co kev co thiab txo qhov kev sib kis ntawm kev co mus rau tus neeg pw tsaug zog. Ntxiv rau, asuab rwb thaiv tsev tsis txheejua los ntawm polyurethane ua npuas ncauj nrog ib tug tuab ntawm 5 hli yuav tsum tau ntsia nruab nrab ntawm lub hauv qab -rail ncoo thiab lub tsheb ciav hlau rau lub nroog rail transit. Lub suab rwb thaiv tsev tsis muaj txheej txheem tuaj yeem nqus cov suab nrov hauv qab ntawm txoj kev tsheb ciav hlau kom ua tiav ob lub suab nrov txo, txo cov suab nrov ntawm lub tsheb ciav hlau los ntawm 8-10dB thiab ua tau raws li cov qauv suab nrov ntawm lub nroog ib puag ncig.
Dab tsi yog cov txheej txheem tshawb nrhiav thiab cov qauv kev txiav txim siab rau cov qauv elastic ntawm hauv qab - cov ntaub ntawv tsheb ciav hlau?
Txoj kev tshawb nrhiav rau qhov elastic modulus ntawm hauv qab -rail pads feem ntau siv covcompression test methodraws li lub teb chaws tus qauv GB/T 531.1-2008. Lub tshuab ntsuas hluav taws xob thoob ntiaj teb yog siv los ua cov qauv ntsuas phoo rau hauv cov qauv ntsuas nrog lub cheeb ntawm 29mm thiab tuab ntawm 12mm. Nyob rau hauv chav tsev kub (23 ± 2 degree), load yog thov ntawm compression ceev ntawm 5mm / min, lub load- deformation nkhaus yog kaw, thiab elastic modulus yog xam los ntawm cov mis (elastic modulus=kev nyuaj siab/strain). Thaum kuaj pom, 3 daim ntawv xeem ntawm tib batch ntawm cov ntaub qhwv yuav tsum tau coj mus kuaj, thiab tus nqi nruab nrab yog coj raws li tus nqi elastic modulus ntawm batch ntawm cov ntaub qhwv. Cov qauv txiav txim tau muab faib raws li hom kab. Lub elastic modulus nyob rau hauv -rail pads rau siab - txoj kev tsheb ciav hlau ceev yuav tsum nyob rau hauv thaj tsam ntawm 80-120MPa nrog qhov sib txawv tsawg dua lossis sib npaug rau ± 10MPa; lub elastic modulus nyob rau hauv -rail pads rau hnyav-haul railways yuav tsum nyob rau hauv thaj tsam ntawm 150-200MPa nrog ib tug compression teem tus nqi tsawg dua los yog sib npaug rau 25%; lub elastic modulus ntawm under-rail pads rau tsheb ciav hlau hauv nroog yuav tsum nyob rau hauv thaj tsam ntawm 60-90MPa nrog ib tug damping zoo tshaj los yog sib npaug rau 0.3. Yog tias qhov ntsuas tau tawm ntawm tus qauv ntau, cov batch of pads raug txiav txim tias tsis tsim nyog thiab yuav tsum tsis txhob siv. Tsis tas li ntawd, qhov ntsuas kub siab thiab qis elastic modulus yuav tsum tau ua los ntsuas qhov elastic modulus ntawm -40℃thiab 60℃feem, xav tau cov elastic modulus hloov pauv tsawg dua lossis sib npaug li 20% kom ntseeg tau tias kev ua haujlwm ruaj khov ntawm lub ncoo nyob rau hauv huab cua kub.