Rail Plate Handling Device Gage Side Insertion
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Solution Overview
Problem
Conventional mechanized systems for handling rail tie plates during maintenance are inefficient, leading to slow operation rates and increased manual handling risks, as they struggle to manage ballast particles and maintain proper plate alignment during tie replacement.
Innovation Solution
A rail plate handling device that grasps and suspends tie plates during tie extraction and replacement, using a control mechanism to align and reposition them correctly, ensuring proper placement by engaging the plate's lip with the rail foot, thereby reducing manual handling and improving operational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional mechanized plate placement devices are used, then automation is improved, but operational speed decreases to 3-5 ties per minute
Solution Approach 1:
The device performs preliminary actions by grasping the tie plate and retracting it to the gage side before tie extraction begins. The plate is positioned and held in readiness, so that when the new tie is inserted, the plate is already in position for immediate placement, eliminating waiting time and enabling continuous operation at higher speeds.
Solution Approach 2:
The system maintains continuous useful action by keeping the tie plate held and positioned throughout the entire tie extraction and replacement cycle. The plate remains in a suspended state ready for placement, ensuring no idle time occurs during the transition from old tie removal to new tie installation, thereby maintaining high operational throughput.
2Ease of operation
If conventional mechanisms grip plates during tie extraction, then manual handling is reduced, but ballast particles interfere with plate repositioning
Solution Approach 1:
The device extracts the tie plate from the work area by retracting it to the gage side and holding it suspended above the track before tie extraction. This removes the plate from the zone where ballast particles are disturbed during tie removal, preventing contamination. After the new tie is installed, the plate is cleanly placed onto the fresh tie surface without ballast interference.
3Manufacturing precision
If tie plates are manually removed and placed, then alignment is maintained, but injury risk increases due to heavy plate manipulation
Solution Approach 1:
The device performs the complete plate handling operation autonomously - grasping, retracting, holding, positioning, and placing the plate. The mechanical system serves itself by using the rail and tie structure as references for proper plate alignment, eliminating the need for manual alignment operations while ensuring consistent positioning accuracy and removing workers from exposure to heavy plate handling hazards.
4Extent of automation
If powered jaws grasp and retract plates, then plate placement is automated, but device complexity increases
Solution Approach 1:
The gripping assembly with powered jaws serves multiple functions: it grasps the tie plate, retracts it to the gage side, holds it suspended during tie extraction, positions it over the new tie, and places it onto the tie. This multi-functional component reduces the need for separate mechanisms for each operation, thereby limiting the increase in overall device complexity while achieving complete automation of the plate handling process.
Data Source
AI summary
A rail plate handling device is provided for removing and reinstalling rail tie plates, wherein at least one of the rails is raised from an operational position during the removal and installation process. A frame is configured for movement relative to the track; at least one tie plate gripping assembly is mounted to the frame, the assembly is configured for grasping a selected tie plate at front and rear edges between an adjacent rail raised from the operational position supported by the selected tie plate and the associated tie, pulling the selected plate away from the adjacent raised rail and away from the associated tie, retaining the selected plate in a suspended position above the track while the tie is extracted and a new tie inserted, and then replacing the suspended tie plate back upon the rail from a gage side of the rail.