Rail Induction Welding Alignment for Gap-Free Track Joints
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Solution Overview
Problem
Existing methods for welding railway rails together, such as thermic and flash-butt welding, result in weak joints, safety hazards, and poor alignment, leading to disruptions in train travel and increased risk of derailment due to gaps between rails.
Innovation Solution
A railway rail induction-welding device with a clamping and lifting module that aligns rails in three perpendicular directions, using induction heating to create a strong, continuous weld without stress, and includes a shear die to remove excess material, ensuring smooth transitions and improved safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermic welding using Goldschmidt reduction process is used, then welding can be performed, but the weld is weaker than the parent rail and creates safety hazards
Solution Approach 1:
The patent replaces traditional thermic welding (chemical/thermal process) with induction welding (electromagnetic field process). The induction heating device uses electromagnetic induction to heat the rail ends uniformly and precisely, eliminating the need for thermite chemistry and open flames, thereby producing stronger welds without safety hazards
Solution Approach 2:
The patent changes the heating parameters from uncontrolled thermal/chemical heating to precisely controlled electromagnetic induction heating. By controlling the induction heating device parameters, the rail ends are heated to optimal welding temperature uniformly, ensuring weld strength matches or exceeds parent rail strength
2Reliability
If flash-butt welding is used, then welding can be performed, but rail alignment is poor and electrical contact requirements are high
Solution Approach 1:
The patent applies preliminary alignment action before welding by using the alignment means to precisely position the rail ends in three mutually perpendicular directions. This pre-alignment ensures that when induction heating and welding occur, the rails are already properly aligned, eliminating the poor alignment problem of flash-butt welding
Solution Approach 2:
The patent replaces the mechanical electrical contact-based heating of flash-butt welding with electromagnetic induction heating. This substitution eliminates the requirement for high electrical contact quality and allows for better alignment control through the alignment means
3Ease of operation
If fishplates are used to connect rails, then rails can be joined, but gaps remain between rails disrupting ride smoothness
Solution Approach 1:
The patent extracts and eliminates the fishplate connection method entirely, replacing it with direct welding of rail ends. By removing the fishplate and gap between rails through induction welding, the rail joint becomes continuous and smooth, eliminating ride disruptions while maintaining ease of operation through the welding process
4Productivity
If traditional welding methods are used, then rails can be welded, but stress fractures and shearing are common
Solution Approach 1:
The patent replaces traditional mechanical/thermal welding processes with induction welding using electromagnetic fields. This substitution provides more uniform and controlled heating, reducing thermal stresses and preventing stress fractures and shearing, thereby improving weld durability while maintaining welding productivity
Solution Approach 2:
The patent changes the heating parameters from uncontrolled thermal processes to precisely controlled electromagnetic induction heating. By optimizing induction heating parameters, the rail ends are heated uniformly to the exact temperature needed for welding, minimizing thermal gradients and stress concentrations that cause fractures
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
The solution provides a strong, smooth, and stable weld that minimizes stress on the rails, allowing for higher train velocities and reduced risk of derailment, while ensuring safety and environmental protection by eliminating gaps and hazards associated with traditional welding methods.
Implementation Method 1
an induction heating device on the device support and interposed or interposable between the first and the second railway-rail clamping modules to inductively weld the opposing railway rails together
Data Source
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AI summary
A railway rail induction-welding device (10) is provided which comprises a device support (12) and a railway rail alignment means for aligning opposing railway rails in three mutually perpendicular directions, the railway rail alignment means being supported by the device support (12). The railway rail alignment means comprises first and second railway-rail clamping elements (16) to horizontally and longitudinally align the opposing railway rails when gripped by the first and second railway-rail clamping elements (16), with at least one of the first and second railway-rail clamping elements (16) being movably supported by the device support (12), and a vertical lifting means for moving each railway-rail clamping element (16) vertically to align the opposing railway rails. The device 10 further comprises an urging means for moving at least one railway-rail clamping element (16) towards the other clamping element (16) to bring aligned opposing railway rails towards each other, and an induction heating device (24) on the device support and interposed or interposable between the first and second railway-rail clamping elements (16) to inductively weld the opposing railway rails together. A railway rail clamping and lifting module (14a, 14b), a vehicle comprising a railway rail induction-welding device (10), and a method of inductively welding opposing railway rails together are also provided.