Seleksyon materyèl pad tren ak adaptasyon pèfòmans
- Poukisa segondè - Ferseur vitès pito kousinen konpoze kawotchou sou kousinen kawotchou òdinè, ak sa ki diferans ki genyen pèfòmans debaz?
High-speed railways (≥250km/h) require high vibration reduction (≥15dB). Ordinary rubber pads (natural rubber) have a modulus of 0.8-1.2MPa, poor aging resistance (8-year service life), and softening at >60 degre. Koub konpoze kawotchou (kawotchou + fib vè) gen yon modil nan 1.5 - 2.0mpa, rediksyon Vibration nan 18 - 22db (3 {{14} Pousantaj konpresyon yo (mwens pase oswa egal a 25%) se pi ba pase kawotchou òdinè (mwens pase oswa egal a 35%), kenbe Elastisite anba alontèm chaj, asire tras Harmony-fè yo pi apwopriye pou gwo-vitès ferovyèr.
- Ki jan yo teste rezistans a mete nan HDPE anba - kousinen tren pou lou - trennen trennen, ki sa ki estanda yo, ak konsekans ki pa - konfòmite?
Test method: Use a Martindale abrasion tester to rub under 500g load for 1000 cycles, measuring mass loss; test hardness change with a Shore durometer. Standards: Mass loss ≤0.05g, hardness change ≤5D (original 65-75D). Consequences of non-compliance: Mass loss >0.1g causes grooves (>2mm deep) on the pad surface, increasing wheel-rail stress by 10-15% and accelerating rail wear; hardness change >10d fè kousinen pèdi kalaj, transfere chaj dirèkteman nan dormeur - Sleeper Top mete depase 0.8mm/ane. Egzanp 5 kousinen pou chak pakèt asire konfòmite.
- Ki endèks pèfòmans ki enpòtan pou anba - kousinen tren nan rejyon alpine (-40 degre), ak ki jan yo verifye li nan tès yo?
Endèks kle a se "Low - tanperati Elastisite retansyon" - kousinen dwe kenbe Elastisite nan -40 degre pou fè pou evite fragilite. Metòd tès: Mete 3 echantiyon nan yon chanm -40 degre pou 24 èdtan, Lè sa a, fè tès konpresyon (20KN chaj, 10% konpresyon) ak mezire rekiperasyon elastik. Creole: pousantaj rekiperasyon elastik pi gran pase oswa egal a 80% (kousinen kawotchou òdinè sèlman 50-60% nan -40 degre) ki pa gen okenn fant. Pa gen ase rekiperasyon solid, ogmante detachman boulon detachman pa 30% akòz transfè Vibration dirèk, ki egzije antretyen souvan.
- Ki sa ki epesè yo estanda nan anba - kousinen tren pou 60kg/m ak 75kg/m ray, ak ki sa ki enpak yo nan epesè move?
Standard thickness: 12-15mm for 60kg/m rails (20t axle load), 15-20mm for 75kg/m rails (27t axle load)-thickness increases with load to disperse pressure. Impacts: 20mm pads for 60kg/m rails cause excessive vertical displacement (>3mm) and frequent gauge adjustments; 12mm pads for 75kg/m rails lead to over 2mm compression (standard ≤1.5mm), permanent deformation, 40% cushioning loss, and sleeper top indentations (>1mm), diminye estabilite.
- Ki sa ki kondisyon yo ki anfòm ant anba - kousinen tren ak tèt Travelers, ki jan yo teste anfòm, ak konsekans nan anfòm pòv?
Requirements: Fit area ≥90%, local gap ≤0.2mm (feeler gauge insertion ≤10mm). Test method: Measure gaps at 5 points per pad with a feeler gauge. Consequences of poor fit: Gaps >0.5mm konsantre chaj sou pwen kontak, ogmante sleeper estrès a 30MPa (estanda mwens pase oswa egal a 20MPa) ak sa ki lakòz fant nan 1 ane; Twou vid ki genyen pèlen dlo/pousyè tè, akselere kowozyon pad ak rakousi sèvis lavi pa 20-30%. Ranplase kousinen oswa ajoute 0.1-0.2mm shims pou anfòm pòv yo.