| 摘要 |
PURPOSE: A bit for excavating bedrock is provided to extend the life of a crushing roller by removing force added to a bearing and a crushing roller and to maximize work efficiency on excavation without structural transformation. CONSTITUTION: The bit for excavating bedrock comprises a pair of central crushing rollers(200a) installed on the center of a drum(100) and provided with an incline inclined inward to be level with the bottom of bedrock(400), an outer crushing roller(200b) installed to the outermost part of the central crushing roller(200a) to be inclined inward from the bottom of bedrock(400), and an intermediate crushing roller(200c) installed between the central crushing roller(200a) and the outer crushing roller(200b).
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