Contact Wire Hanger With Friction Damping for Pantograph Stability
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Solution Overview
Problem
Existing hangers for supporting contact wires in aerial power supply railway lines are complex, costly to manufacture and maintain, and their performance degrades over time due to helical springs that change elastic behavior, leading to detachment issues between the pantograph and contact wire, especially at high speeds.
Innovation Solution
A hanger design featuring a frame with a hinge and torsion spring, combined with a metal frame that acts as both a support and elastic element, and a damping assembly with a sliding friction mechanism, allowing for easy assembly, reduced components, and adjustable pre-load to maintain optimal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple helical springs are used in the hanger, then the damping and elastic behavior is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple helical springs into a single helical spring assembly that integrates the damping and elastic functions. This merging reduces the number of separate components while maintaining the required mechanical performance for contact wire support and pantograph detachment prevention.
Solution Approach 2:
The single helical spring assembly performs multiple functions simultaneously: providing elastic support, damping vibrations, and maintaining contact pressure. This multi-functionality eliminates the need for separate damping devices and multiple springs, simplifying the overall hanger structure.
2Reliability
If multiple helical springs are used in the hanger, then the elastic behavior is improved, but the manufacturing and assembly complexity increase
Solution Approach 1:
By merging multiple spring functions into a single helical spring assembly, the manufacturing process is simplified from producing and assembling multiple precision springs to manufacturing one integrated component. This reduces assembly steps and potential error sources.
Solution Approach 2:
The helical spring assembly is designed as a modular unit that can be independently manufactured and then installed as a complete assembly, separating the complex spring mechanism from the rest of the hanger structure. This modular approach simplifies both manufacturing and field assembly.
3Reliability
If helical springs are used in the hanger, then the elastic support is provided, but the elastic behavior changes over time leading to performance degradation
Solution Approach 1:
The patent modifies the physical parameters of the helical spring assembly, including wire diameter, coil density, and material composition, to enhance dimensional stability and resist creep. These parameter changes ensure the spring maintains consistent elastic properties throughout its operational life, preventing performance degradation.
Solution Approach 2:
The helical spring is manufactured from composite or alloy materials that combine high elasticity with excellent dimensional stability and resistance to metal fatigue. This material selection ensures the spring maintains its elastic behavior over extended periods of service.
4Manufacturing precision
If pre-load adjustment of helical springs is required, then the optimal operating position is achieved, but the adjustment time and complexity increase
Solution Approach 1:
The helical spring assembly is pre-adjusted during manufacturing to provide the correct pre-load and optimal operating position. This preliminary action eliminates the need for time-consuming field adjustments, allowing the hanger to be installed and immediately operate at peak efficiency.
Solution Approach 2:
The design incorporates self-adjusting features that automatically compensate for variations in installation conditions and maintain optimal pre-load without requiring manual intervention. The system self-regulates to achieve and maintain the correct operating position.
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 new hanger design reduces detachments between the pantograph and contact wire, maintains consistent performance over time, and simplifies manufacturing and maintenance, ensuring efficient operation at various speeds and positions along the line.
Implementation Method 1
a hinge (18) connecting the lower fastening body (16) to the upper jaw (15) and configured so as to allow the lower fastening body (16) to rotate around the hinge axis (19), wherein the hinge (18) is associated with a helical torsion spring (20)
Implementation Method 2
a friction sliding joint (32) connecting the sleeve (32) to the rod (23) and configured so as to allow the sleeve (32) to slide along the rod (23)
Implementation Method 3
Between each movable part and the frame there is interposed a relative helical compression spring
Data Source
AI summary
An aerial power supply railway line has a plurality of hangers, each having, in turn, a fastening member adapted to be fixed to a supporting element, a supporting frame coupled to the fastening member, a fastening terminal adapted to be coupled to a portion of a contact wire with a pantograph of a railway vehicle, a member, which is movable relative to the supporting frame in opposite ways in a first direction in the presence of an external disruptive action transmitted to the contact wire, and an elastic device interposed between the member and the terminal and having elastic means consisting of elastically deformable parts of the supporting frame; connecting rods being provided between the movable member and the elastically deformable parts of the supporting frame.