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我矿拥有4台2100BL挖掘机，每台重426t。由于我矿受采场条件限制，挖掘机移动频繁，因此，驱动轮消耗量大，每年消耗驱动轮16个，价值45多万元，成为挖掘机维修费用的主要部分之一。2100BL挖掘机驱动轮重3．88t，进口件单价为85万元，国产替代件单价为2．76万元，该件的结构如
My mine has 4 2100BL excavators, each weighing 426t. Due to the limitation of stope in mine, the excavator moves frequently. Therefore, the drive wheel consumes a large amount of energy and consumes 16 driving wheels each year, worth more than 450,000 yuan, becoming one of the main parts of excavator maintenance costs. 2100BL excavator drive wheel weighs 3.88t, import parts priced at 850,000 yuan, domestic replacement parts priced at 27,600 yuan, the structure of the pieces such as