Ballast Replacer-Compactor Downward Compaction for Tie Support
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Solution Overview
Problem
Pressure-squeeze type tampers used in tie gangs fail to effectively place new ballast under ties during maintenance, leading to uneven load distribution and weak track surfaces, as they primarily compress existing foul ballast without proper compaction, resulting in new ties not bearing properly and transferring loads to weaker ties.
Innovation Solution
A Ballast Replacer-Compactor that uses downward-facing compactor bars to displace foul ballast and insert clean ballast under ties, with pressure sensing circuits controlling compaction strokes and a vibrating crib compactor to ensure proper consolidation, avoiding the high-pressure issues of traditional tampers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pressure-squeeze type tampers are used to compact ballast under ties, then compaction force is applied to existing ballast, but new ballast is not effectively placed under the ties resulting in poor bearing support
Solution Approach 1:
Instead of squeezing ballast from the sides as conventional tampers do, this invention uses downward-facing compactor bars that push clean ballast down through the crib and under the ties from above, inverting the traditional compaction direction to simultaneously place and compact new ballast
Solution Approach 2:
Clean ballast is placed in the crib (preliminary placement) before compaction occurs. The compactor bars then push this pre-positioned clean ballast down through the crib and under the ties, ensuring new ballast is in place before final compaction
2Manufacturing precision
If high-pressure squeezing is applied to compact ballast, then compaction density increases, but ballast stones are damaged and broken reducing track quality
Solution Approach 1:
Instead of applying lateral squeezing pressure that breaks stones, the system applies downward pushing force through the crib to reposition and compact ballast under ties, inverting the pressure direction to avoid stone fragmentation while achieving compaction
Solution Approach 2:
The crib ballast acts as an intermediary medium that is pushed down through the surrounding ballast. This intermediary action allows compaction to occur through displacement rather than direct high-pressure squeezing, preventing ballast damage while achieving consolidation
3Productivity
If rapid tie replacement is performed, then productivity increases, but proper ballast compaction is compromised resulting in uneven load distribution
Solution Approach 1:
The compactor bars continuously push clean ballast down through the crib and under the ties in a continuous motion during the tie replacement process. This continuous action ensures proper compaction occurs simultaneously with tie installation, maintaining both productivity and reliability without requiring separate compaction passes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures full bearing support for new ties with reliable and uniform ballast distribution, reducing track degradation and extending maintenance intervals, while preventing ballast damage through controlled compaction and vibration frequencies.
Implementation Method 1
The compactor bars, following a downward arcuate path, push this clean stone down through the crib and under the ties, displacing the foul ballast
Implementation Method 2
This vibrating plate is deployed and compacts the crib ballast behind the target tie
Data Source
AI summary
Ballast replacer-compactors and related methods are provided. A representative ballast replacer-compactor includes: a frame; a crib compactor mounted to the frame and operative to compact crib ballast; and a compactor bar mounted to the frame and operative to urge crib ballast downwardly and beneath a tie. A representative method for servicing rail system ties includes: engaging crib ballast positioned adjacent to a target tie; and forcing the crib ballast downwardly and beneath the target tie.