| 摘要 |
A crib ballast clearing machine comprises a machine frame supported on undercarriages adapted to support the machine frame on a track comprised of rails fastened to ties defining cribs therebetween, and a ballast scarifying device comprising a revolvable endless excavating chain vertically adjustably mounted on the machine frame for removing ballast from a respective one of the cribs between the rails, a drive for revolving the endless excavating chain, and a displacement drive for vertically adjusting the endless excavating chain. The endless excavating chain has a lowermost ballast receiving part being immersible in ballast in the crib between the rails upon vertical adjustment of the endless excavating chain.
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