| 摘要 |
A ballast tamping unit for tamping ballast under two successive ties comprises a vertically adjustable tamping tool carrier and a set of two pairs of opposed vibratory and reciprocable tamping tools mounted on the tamping tool carrier, the pairs of tamping tools being so spaced from each other that two adjacent tamping tools of the pairs may be immersed in the crib between two successive ties and two remote tamping tools of the pairs may be immersed in respective cribs adjacent the successive ties. Each tamping tool comprises a tamping pick having a substantially straight shaft having a center axis extending between a lower and an upper end, a tamping jaw at the lower tamping pick shaft end and a tamping pick holder, the upper end of the tamping pick shaft being detachably mounted in the tamping pick holder, the two adjacent tamping tools being reciprocable into an end position wherein the center axes and upper ends thereof substantially extend in a vertical plane extending perpendicularly to the direction of elongation of the track on which the tamping unit is mounted. Drives are connected to the tamping tools for vibrating and reciprocating the tamping tools.
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