optibelt欧皮特聚氨酯同步带公制AT20型规格尺寸表optibelt欧皮特AT20同步带规格节线长齿数AT20x1080-TPU1080.0054AT20x1240-TPU1240.0062AT20x1280-TPU1280.0064AT20x1320-TPU1320.0066AT20x1460-TPU1460.0073AT20x1700-TPU1700.0085AT20x1780-TPU1780.0089AT20x1880-TPU1880.0094AT20x1900-TPU1900.0095AT20x2360-TPU2360.00118AT20x2600-TPU2600.00130AT20x2760-TPU2760.00138AT20x3100-TPU3100.00155)