Rail Grinding Machine with Variable Wheel Spacing
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Solution Overview
Problem
Existing grinding machines for railway rails face issues such as ineffective re-profiling due to constant wheel pitch, low performance, poor finish quality, safety concerns on curves or in urban environments, and inefficient metal powder suction, primarily due to high working speed and lack of electric/hydraulic motors.
Innovation Solution
A compact grinding machine with a reduced number of wheels, featuring a frame mounted on four sliding wheels, vertical axis pistons for adjusting grinding wheel position, and electric motors with pulleys to rotate grinding wheels, allowing for variable wheel spacing and inclined contact with the rail for adaptive profiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of wheels are used to grind the rail, then the coverage of undulations is improved, but the machine becomes unstable on curves and in urban environments
Solution Approach 1:
The grinding function is segmented into multiple independent grinding units, each with its own motor and wheel assembly. These units are distributed along the frame at different positions, allowing each unit to independently contact and grind different sections of the rail profile, thereby covering various undulations without requiring a large number of wheels
Solution Approach 2:
The grinding units are designed with adjustable positions along the frame, allowing dynamic reconfiguration of the wheelbase distance between units. This dynamic adaptability enables the machine to adjust to different rail conditions and curve radii, maintaining stability while effectively covering undulations across varying wavelengths
2Productivity
If the working speed is increased to improve productivity, then the processing speed is improved, but the suction efficiency of abrasive metal powders deteriorates
Solution Approach 1:
The suction system is segmented into multiple localized suction units, each positioned near a corresponding grinding unit. This segmentation allows each suction unit to efficiently capture metal powders at their source, maintaining high suction efficiency even at increased working speeds by reducing the distance powders must travel before being captured
Solution Approach 2:
The suction system operates continuously alongside the grinding process, with suction units actively removing metal powders throughout the entire grinding operation. This continuous action prevents powder accumulation and maintains consistent suction efficiency across varying processing speeds
3Adaptability or versatility
If the wheelbase distance is reduced to improve adaptability, then the coverage of undulations is improved, but the machine complexity increases
Solution Approach 1:
Each grinding unit is designed as a universal module that can function independently or in combination with other units. The units share common components such as motors, wheel assemblies, and suction mechanisms, allowing the system to achieve high adaptability through modular configuration rather than through an increased total number of wheels
Solution Approach 2:
Multiple functions are merged into integrated grinding units that combine grinding, positioning, and local suction capabilities in single modular assemblies. This merging reduces overall system complexity by eliminating redundant components while maintaining the adaptability to adjust wheelbase distances for different undulation wavelengths
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 effective and safe re-profiling of railway rails with improved performance, finish quality, and suction efficiency by allowing precise adjustment of grinding wheel positions and operation on curves and in urban environments.
Implementation Method 1
Thanks to the inclined wheel/rail contact with the rail, the high-speed towed wheels are able to rotate and work the undulations of the longitudinal profile of the rail by friction.
Implementation Method 2
grinding wheels whose circumferential surface rests on the longitudinal profile of the rail
Data Source
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AI summary
Grinding machine comprising: - a first frame (2) mounted on four wheels (4) sliding along the rails (6) to be ground, - a second frame (8) provided with wheels (10) for supporting and sliding along the rails (6), - means for vertical movement of said second frame (8) with respect to said first frame (2), - a third frame (14), above the second frame (8), on which at least three electric motors (28, 28') with parallel axes are mounted, to each shaft of said motors (28, 28') a pulley (32) being integral in rotation with which the shaft of a grinding wheel (34) is also integral, - means for vertical movement of said third frame (14) with respect to the second frame (8). characterized by the fact that at least one of the three motors (26, 28) and the grinding wheel (34) rotoidally connected to it are translated horizontally by means which determine the variation of the center distance between the three grinding units constituted by the motors (28, 28) and the corresponding wheels (34).