Ballast tamping assembly with mechanical stops on tamping picks for limiting pivotal movement

摘要

An ballast tamping assembly comprises four independently displaceable ballast tamping units arrayed in a line extending transversely to the machine frame elongation. Each ballast tamping unit comprises a carrier frame, a tamping tool carrier vertically adjustably mounted on the carrier frame, and a pair of vibratory tamping tools mounted on the tamping tool carrier for reciprocation in the track direction. Each vibratory tamping tool has a tamping pick remote from the carrier frame and pivotal about an axis extending in the direction of the machine frame elongation and connected to a pivoting drive, and another tamping pick immediately adjacent the carrier frame and fixedly connected to the tamping tool, the remote tamping pick being pivotal between two end positions delimited by respective stops, a first one of the end positions being immediately adjacent the other tamping pick for immersion of the tamping picks at one rail side and the second end position being remote from the other tamping pick for immersion of the tamping picks at respective rail sides. Independently operable drives are connected to the ballast tamping units for displacing the ballast tamping units in a direction extending transversely to the machine frame elongation.