Taug qab Subgrade Elastic Modulus Grading Tsim thiab taug qab kev vibration thiab suab nrov txo kev hloov kho tshuab
Dab tsi yog cov qauv kev muab qhab nia ntawm cov qauv elastic ntawm hauv qab - cov ntaub ntawv tsheb ciav hlau thiab cov xwm txheej sib thooj?
Lub elastic modulus ntawm hauv qab -rail pads muab faib ua peb qib. Qib 1 modulus nyob ntawm 200-300MPa, haum rau siab- kev tsheb ciav hlau ceev thiab kev tsheb ciav hlau sib tshuam nrog cov kev cai nruj rau kev vibration thiab suab nrov txo, uas tuaj yeem txo qhov kis tau tus mob siab - zaus vibration. Qib 2 modulus ranges ntawm 400-600MPa, haum rau hnyav- cov kab tsheb thauj khoom, ntsuas kev vibration txo kev ua haujlwm thiab thauj khoom-cov kabmob muaj peev xwm tiv taus lub nra hnyav hnyav ntawm cov tsheb ciav hlau hnyav. Qib 3 modulus ranges ntawm 800-1000MPa, haum rau cov kev tsheb ciav hlau zoo tib yam thiab lub Hoobkas tshwj xeeb kab, ua tau raws li qhov xav tau ntawm kev co txo qis thaum tswj cov nqi. Cov ntaub qhwv nrog cov qauv sib txawv tau txais cov ntaub ntawv sib txawv: Qib 1 cov ntaub qhwv raws li cov roj hmab nitrile nrog cov khoom ua npuas ntxiv, Qib 2 cov ntaub qhwv siv cov ntaub ntawv sib xyaw polyurethane, thiab Qib 3 cov ntaub qhwv yog ua los ntawm cov roj hmab ntuj. Cov qauv muab qhab nia yuav tsum ua raws li cov qauvTechnical Code for Vibration and Noise Reduction of Urban Rail Transit. Kev sib xyaw cov ntaub qhwv nrog cov moduli sib txawv ntawm tib txoj kab yog txwv nruj, txwv tsis pub nws yuav ua rau tsis sib xws ntawm txoj kev tsheb ciav hlau thiab ua kom lub log nrawm dua - tsheb ciav hlau.
Dab tsi yog cov khoom siv mis optimization thiab kev co txo qhov cuam tshuam ntawm qis -modulus nyob rau hauv -rail pads rau siab - kab tsheb ciav hlau ceev?
Tsawg-modulus nyob rau hauv- tsheb ciav hlau ncoo rau siab- cov kab tsheb ciav hlau ceev tau txais cov qauv tsim qauv ntawm "nitrile rubber + nano calcium carbonate + kaw-cell foaming agent". Qhov sib ntxiv ntawm nano calcium carbonate yog tswj ntawm 15%-20%, uas tuaj yeem txhim kho cov txheej txheem compression tsis kam ntawm cov ntaub qhwv, nrog rau cov txheej txheem compression tsawg dua los yog sib npaug li 8%, zoo dua li 15% ntawm cov roj hmab ib txwm siv. Lub kaw-tus neeg ua npuas ncauj ntawm tes siv azodicarbonamide, thiab cov foaming pore loj yog tswj ntawm 50-100μm. Cov npuas sib xyaw ua ke tuaj yeem nqus tau siab - lub log zaus- tsheb ciav hlau kev co, txo qhov kev co kis tau los ntawm ntau dua 40% . 5% anti- tus neeg saib xyuas kev laus kuj tau ntxiv rau cov qauv txhawm rau txhim kho huab cua tsis kam ntawm cov ntaub qhwv, tswj kev ua haujlwm ruaj khov nyob rau hauv ib puag ncig ntawm -40℃rau 6 xyoo. Lub elastic modulus ntawm lub optimized pads yog ruaj khov nyob ib ncig ntawm 250MPa. Lub suab nrov thaum lub tsheb ciav hlau hla tuaj yeem txo qis qis dua 65dB, ua tau raws li qhov xav tau ntawm lub suab nrov ntawm thaj chaw nyob raws txoj kev tsheb ciav hlau ceev. Kev ntsuam xyuas teb qhia tau hais tias nyob rau hauv txoj kev taug kev siv cov ntaub qhwv no, lub ncov tus nqi ntawm lub log-rail kev vibration acceleration yog txo los ntawm 50%, thiab cov neeg caij tsheb kev nplij siab tau zoo dua.
Dab tsi yog qhov kev txhim kho cov qauv tsim thiab kev tiv thaiv - cuam tshuam kev ntsuas siab ntawm -modulus hauv qab - tsheb ciav hlau pads rau hnyav - cov kab tsheb?
High-modulus nyob rau hauv-rail pads rau hnyav- cov kab nqa tau txais cov qauv tsim qauv ntawm "polyurethane matrix + iav fiber reinforced txheej". Cov iav fiber reinforced txheej yog teem rau sab sauv thiab sab saum toj ntawm cov ntaub qhwv nrog lub thickness ntawm 2 hli, uas tuaj yeem txhim kho lub zog tsim kua muag ntawm cov ntaub qhwv kom ntau dua lossis sib npaug li 80kN / m, 3 zaug siab dua li ntawm cov ntaub qhwv polyurethane zoo tib yam. Cov txheej txheem nruab nrab ntawm lub ncoo yog tsim los ua cov qauv honeycomb nrog lub xov tooj ntawm tes loj ntawm 20mm, uas tsis tsuas yog ua kom muaj peev xwm thauj khoom, tab sis kuj absorbs lub zog cuam tshuam los ntawm kev deformation ntawm phab ntsa honeycomb, nrog rau qhov cuam tshuam qhov nqus tau ntau dua lossis sib npaug li 30%. Cov txheej txheem kev ntsuas qhov tseem ceeb yog ntxiv hnav- tiv thaiv ntug qhwv rau cov npoo npoo. Cov ntaub qhwv ntug yog ultra- siab molecular hnyav polyethylene, uas txhim kho hnav tsis kam los ntawm 5 zaug thiab zam kev puas tsuaj los ntawm lub log - rail lateral force. Lub elastic modulus ntawm siab -modulus pads yog tswj ntawm 500MPa, uas tuaj yeem tiv taus qhov cuam tshuam rov qab ntawm 30t qag load tsheb ciav hlau, nrog rau compression deformation Tsawg dua lossis sib npaug li 2 hli thiab tsis muaj qhov pom tseeb ntawm cov yas deformation tom qab siv sijhawm ntev -. Txhawm rau txhawm rau txhim kho kev tiv thaiv- cuam tshuam kev ua haujlwm, qhov chaw sib cuag ntawm lub ncoo thiab lub txaj pw yog tsim los nrog kev tiv thaiv- plam kev ntxhib los mos, nrog kev sib txhuam coefficient Ntau dua lossis sib npaug rau 0.6, tiv thaiv lub ncoo los ntawm kev ntog hauv qab.
Dab tsi yog qhov ua rau elastic modulus attenuation nyob rau hauv -rail pads thiab ntev -lub sij hawm stability guarantee technologies?
Qhov ua rau ntawm elastic modulus attenuation nyob rau hauv -rail pads feem ntau suav nrog peb yam: cov khoom aging, compression qaug zog, thiab ib puag ncig erosion. Cov khoom laus yog qhov kev ua haujlwm tsis zoo los ntawm kev tawg ntawm cov roj hmab molecular chains, thiab tus nqi attenuation accelerates nyob rau hauv qhov kev txiav txim ntawm ultraviolet rays thiab ozone; compression qaug zog yog lub cim ntawm micro- tawg hauv cov ntaub qhwv vim qhov rov ua haujlwm ntawm lub sijhawm ntev - lub log - tsheb ciav hlau thauj khoom, ua rau ib xyoos - los ntawm - xyoo txo hauv elastic modulus; ib puag ncig kev yaig suav nrog cov kua qaub-puag corrosion thiab roj paug rau hauv lub cev, uas yuav ua rau cov khoom siv ntawm cov ntaub qhwv thiab ua rau cov qauv tsis zoo. Lub hauv paus ntawm lub sijhawm ntev-lub sij hawm ruaj ntseg lav thev naus laus zis yog kev siv tshuab thev naus laus zis vulcanization, uas ua rau cov roj hmab molecules tsim tus ntoo khaub lig ruaj khov- txuas network thiab ua ob npaug rau kev tiv thaiv kev laus. Thaum lub sij hawm tsim khoom, vulcanization kub thiab lub sij hawm yog nruj me ntsis tswj: lub vulcanization kub yog 160 degree, thiab tuav lub sij hawm yog 20 feeb los xyuas kom meej tus ntoo khaub lig-linking℃mus txog ntau tshaj 85%. Ua ntej tawm hauv lub Hoobkas, cov ntaub qhwv yuav tsum tau kuaj xyuas kev laus sai. Tom qab kev laus ntawm 70℃rau 1000 teev, qhov elastic modulus attenuation tus nqi Tsawg dua los yog sib npaug li 10% tuaj yeem txiav txim tau raws li kev tsim nyog. Tsis tas li ntawd, cov tshuaj tiv thaiv -corrosion cushions yuav tsum tau muab tso rau hauv qab cov ntaub qhwv thaum lub sij hawm ntawm - qhov chaw teeb tsa kom cais cov kua qaub- cov tshuaj hauv cov av thiab txuas ntxiv lub neej kev pab cuam ntawm cov ntaub qhwv.
Dab tsi yog cov txheej txheem tseem ceeb thiab cov txheej txheem tsim nyog rau kev sim elastic modulus ntawm hauv qab - cov ntaub ntawv tsheb ciav hlau?
Cov txheej txheem tseem ceeb rau kev sim cov qauv elastic ntawm hauv qab -rail pads yog qhov kev sim compression rebound. Lub tshuab ntsuas hluav taws xob thoob ntiaj teb yog siv, nrog rau kev thauj khoom tus nqi tswj ntawm 5mm / min. Tom qab thauj khoom mus rau qhov ntsuas load, lub load yog unloaded, compression deformation thiab rebound tus nqi ntawm cov ntaub qhwv, thiab cov elastic modulus yog xam los ntawm kev ntxhov siab -strain nkhaus. Thaum lub sij hawm kuaj, qhov tseeb ua hauj lwm tej yam kev mob yuav tsum tau simulated, qhov ntsuas kub yog tswj ntawm 23℃± 2 degree, thiab cov av noo yog 50% ± 5% kom tsis txhob muaj kev cuam tshuam ntawm kub thiab av noo ntawm qhov kev xeem. Cov txheej txheem tsim nyog tau muab faib ua raws li kab hom: lub elastic modulus ntawm pads rau siab - txoj kev tsheb ciav hlau ceev yuav tsum nyob rau hauv thaj tsam ntawm 200-300MPa, compression teem tus nqi tsawg dua lossis sib npaug li 8%, thiab tus nqi rov qab ntau dua lossis sib npaug li 95%; lub elastic modulus ntawm cov ntaub qhwv rau hnyav- txoj kev tsheb ciav hlau yuav tsum nyob hauv thaj tsam ntawm 400-600MPa, thiab lub zog tsim kua muag Ntau dua lossis sib npaug li 80kN / m; Lub elastic modulus ntawm cov ntaub qhwv rau cov kev tsheb ciav hlau zoo tib yam yuav tsum nyob rau hauv thaj tsam ntawm 800-1000MPa, thiab Shore hardness tswj ntawm 60-70HA. Thaum lub sij hawm xeem txheej txheem, 10% ntawm cov ntaub qhwv nyob rau hauv tib batch yog random xaiv rau kev xeem, thiab batch tuaj yeem tawm hauv lub Hoobkas tsuas yog thaum tus nqi tsim nyog ntau dua lossis sib npaug rau 98%. Cov batch uas tsis tsim nyog yuav tsum tau rov ua dua tshiab kom ntseeg tau tias cov khoom ua tau raws li cov qauv.