1,ʻO ke ʻano hemahema o ka pulley MC a me ka nānā ʻana i ke kumu　

　　Lilo ka mea MC nylon i ka polyamide ma ke ʻano kemika a loaʻa i nā mea paʻa covalent a me nā molekala, ʻo ia hoʻi i hoʻopaʻa ʻia i loko o ka molekala i hoʻopaʻa ʻia e nā paʻa covalent a i hoʻopaʻa ʻia ma waena o nā molekala.ʻO kēia ʻano o ka mea i loaʻa i nā ʻano pono like ʻole e like me ke kaumaha māmā, ke kūpaʻa ʻaʻahu, ka pale ʻana i ka corrosion, insulation, a me nā mea ʻē aʻe.　

　　ʻO ka MC nylon pulley i hoʻohanaʻia i ka puka pale o Tianjin Metro Line 2 e loaʻa i nāʻanoʻelua o ka hāʻuleʻana ma hope o kekahi manawa: (1) komo i ka lihi o waho o ka pulley;(2) ka hoʻomaʻemaʻe ma waena o ke apo o loko o ka pulley a me ka halihali.

ʻO nā kumu o nā ʻano hemahema ʻelua i luna, ua hana ʻia ka loiloi ma lalo nei.　

　　(1) ʻAʻole pololei ke kino o ka puka, a ʻaʻole pololei ke kūlana o ka pulley i ka wā o ka hana ʻana, kahi e hoʻohana ai ka ʻaoʻao o waho, a ʻike ʻia ka ikaika o ka ʻaoʻao o loko o ka pulley a me ka lawe ʻana i nā ʻaoʻao like ʻole. koʻikoʻi wahi.　

　　(2) ʻAʻole pololei ka track a ʻaʻole palahalaha ka ʻili o ke ala, e ʻeha ai ma waho.　

　　(3) I ka wehe ʻana a pani ʻana o ka puka, neʻe ka puka sliding, ua hoʻokau ʻia ka huila sliding i ka ukana cyclic no ka manawa lōʻihi, e hopena i ka deformation luhi, deformed ka huila o loko o ka pulley a hana ʻia kahi āpau.　

　　(4) ka puka i ka hoʻomaha, ka pulley e hali ana i ke kaumaha o ka sliding puka, lōʻihi manawa e amo i ka paʻa ukana, ka hopena i ka creep deformation.　

　　(5) Aia kahi ʻokoʻa paʻakikī ma waena o ka bearing a me ka pulley, a ʻo ka hana extrusion lōʻihi e hoʻohua i ka deformation a hoʻopau i ka hemahema [2].　

　　2 MC pulley kaʻina helu ola　

　　ʻO MC nylon pulley he hale polymer o nā mea ʻenekinia, i ka hana hana maoli, e ka mahana a me ke kuleana o ka ukana, ka molecular structure o ka irreversible deformation, ka mea i alakaʻi i ka luku ʻana i ka mea [3].　

　　(1) Manaʻo ʻia ma ke ʻano o ka mahana: me ka hoʻololi ʻana o ka mahana i loko o ke kaiapuni, aia ka pilina ma waena o nā waiwai kino o nā mea hana a me ka manawa o ka hāʻule ʻole, i hōʻike ʻia ma ke ʻano he hana o　

　　F (P) = Kτ (1)　

　　inā ʻo P ka waiwai kino a me ka waiwai mechanical;ʻO K ka pākēneka pane mau;τ ʻo ia ka wā ʻelemakule.　

　　Inā hoʻoholo ʻia ka mea, a laila ua hoʻoholo ʻia ka waiwai P o nā ʻāpana kino o kēia mea, a ua hoʻonohonoho ʻia nā waiwai i hōʻoia ʻia o ka tensile a me ke kulou ma luna o 80%, a laila ʻo ka pilina ma waena o ka manawa koʻikoʻi a me K mau.　

　　τ=F(P)/K (2)　

　　ʻO ka mea mau K a me ka mahana T e māʻona i ka pilina ma lalo nei.　

　　K=Ae(- E/RT) (3)　

　　kahi o E ka ikehu ho'āla;ʻO R ke kinoea mau loa;He mau ko A a me e.I ka lawe ʻana i ka logarithm o nā kumu ʻelua ma luna me ka makemakika a me ka hoʻoponopono ʻana i ka deformation, loaʻa iā mākou　

　　lnτ = E/(2.303RT) C (4)　

　　Ma ka hoohalike i loaa mai maluna, he mau ia C.E like me ka hoohalike maluna, ua ike ia he pilina maikai like ma waena o ka manawa koʻikoʻi a me ka mahana.Ke hoʻomau nei me ka deformation o ka hoʻohālikelike i luna, loaʻa iā mākou.　

　　lnτ=ab/T (5)　

　　E like me ke kumumanaʻo o ka helu helu, ua hoʻoholo ʻia nā mea mau a me b i ka hoʻohālikelike i luna, a hiki ke helu ʻia ke ola koʻikoʻi ma ka wela lawelawe.　

　　ʻO ka laina metro ʻo Tianjin 2 kahi kahua ma lalo o ka honua, ma muli o ke kuleana o ka puka pale a me ka hoʻokele apo, ʻo ka mahana ma kahi o ka pulley e paʻa i ka makahiki, ana ʻia ma ka lawe ʻana i ka waiwai awelika o 25°, ma hope o ka nānā ʻana i ka papaʻaina, hiki iā mākou ke loaʻa a = -2.117, b = 2220, lawe mai t = 25° i loko (5), hiki iā mākou ke loaʻaτ = 25.4 makahiki.E lawe i ka helu palekana o 0.6, a loaʻa ka waiwai palekana o 20.3 makahiki.　

　　(2) e hoʻouka i ka loiloi ola luhi: ʻo ka mea i luna no ka noʻonoʻo ʻana i ka mahana o ka helu ʻana o ke ola pulley, a ma ka hoʻohana maoli ʻana, e kau ʻia ka pulley i ke kuleana o ka ukana, ʻo kāna kumu: polymer molecular structure ma lalo. ʻO ka hana o ka hoʻololi ʻana i hana i ka hoʻololi ʻana a me ka deformation o ka molecular structure, nā mea hana mechanical i ke ʻano o ke kaulahao mole, hana i ka rotation a me ka distortion, ka hoʻokumu ʻana i ke ʻano kālā a me ke ʻano shear band kala, e hōʻike ana i ka luhi, me ka hōʻiliʻili ʻana o kahi nui. ka helu o ka hoʻouka ʻana i ka pōʻaiapuni, hoʻonui mālie ke kumu kālā, hana i kahi māwae, a hoʻonui nui ʻia, a ma hope i alakaʻi ʻia i ka haʻihaʻi o ka pōʻino waiwai.　

　　Ma kēia helu ola, ua hana ʻia ka nānā ʻana o ke ola ma lalo o nā kūlana o ke kaiapuni kūpono, ʻo ia hoʻi, palahalaha ke ala a paʻa hoʻi ke kūlana kino o ka puka.　

　　E noʻonoʻo mua i ka hopena o ka hoʻouka pinepine ʻana i ke ola: ʻehā mau pulleys kēlā me kēia puka, ʻo kēlā me kēia pulley kaʻana like i ka hapaha o ke kaumaha o ka puka, ma hope o ka nānā ʻana i ka ʻike he 80kg ke kaumaha o ka puka sliding, hiki ke loaʻa ka gravity o ka puka: 80× 9.8 = 784 N.　

　　A laila kaʻana like i ka ʻumekaumaha ma kēlā me kēia pulley e like me: 784÷ 4 = 196 N.　

　　ʻO ka laula o ka puka hoʻoheheʻe he 1m, ʻo ia hoʻi, i kēlā me kēia manawa e wehe ʻia a pani ʻia ka puka no 1m, a laila e ana i ke anawaena o ka pulley he 0.057m, hiki ke helu ʻia e like me kona ʻāpana: 0.057× 3.14 = 0.179m.　

　　A laila wehe ka puka hoʻoheheʻe i hoʻokahi manawa, hiki ke loaʻa ka helu o nā huli e pono ai ka pulley e hele: 1÷ 0.179 = 5.6 huli.　

　　Wahi a ka ʻikepili i hāʻawi ʻia e ka 'Oihana Hoʻokele Traffic, ʻo ka nui o nā holo ma kekahi ʻaoʻao o ka mahina he 4032, hiki ke loaʻa mai ka helu o nā holo i kēlā me kēia lā: 4032÷ 30 = 134.　

　　i kēlā me kēia kakahiaka e hoʻāʻo ke kikowaena i ka puka pale ma kahi o 10 mau manawa, no laila ʻo ka huina o nā neʻe ʻana o ka puka hoʻoheheʻe i kēlā me kēia lā: 134 10 = 144 mau manawa.　

　　hoʻokahi ka hoʻololi ʻana i ka puka, ʻo ka huli ʻana o ka pulley he 11.2, ʻo ka puka hoʻoheheʻe i ka lā he 144 ka pōʻai hoʻololi, no laila ʻo ka huina o nā pulley i ka lā: 144× 5.6 = 806.4 huli.　

　　ʻO kēlā me kēia ʻūhā o ka pulley, pono mākou e kau i ka pōʻaiapuni o ka ikaika, i hiki iā mākou ke loaʻa i kona alapine ikaika: 806.4÷ (24× 3600) = 0.0093 Hz.　

　　Ma hope o ka nānā ʻana i ka ʻikepili, 0.0093 Hz kēia alapine e pili ana i ka helu o nā pōʻai kokoke i ka infinity, e hōʻike ana he haʻahaʻa loa ke alapine o ka ukana, ma aneʻi ʻaʻole pono e noʻonoʻo.　

　　(3) e noʻonoʻo hou i ka hopena o ke kaomi i ke ola: ma hope o ka nānā ʻana, ʻo ka hoʻopili ʻana ma waena o ka pulley a me ke ala no ka hoʻopili ʻana i ka ʻili, ua kuhi ʻia kona ʻāpana: 0.001.1× 0.001.1 = 1.21× 10-6m2　

　　E like me ka metric kaomi: P = F / S = 196÷ 1.21× 10-6 = 161× 106 = 161MPa　

　　Ma hope o ka nānā ʻana i ka pākaukau, ʻo ka helu o nā pōʻai e pili ana i 161MPa ʻo 0.24×106;e like me ka helu o ka mahina 4032 manawa, hiki ke loaʻa ka helu o nā pōʻai i ka makahiki: 4032×12=48384 manawa　

　　A laila hiki iā mākou ke loaʻa kēia kaomi e pili ana i ke ola o ka pulley: 0.24× 106÷ 48384 = 4.9 makahiki