Conductive Polymer Inserts for Sliding Catenary Hanger Clamps
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Solution Overview
Problem
Existing hanger clamps for rigid overhead catenary systems face issues with high maintenance costs and brittleness due to carbon/graphite composite inserts, and insulating characteristics with plastic materials, which do not adequately address dimensional variations and electrical potential alignment.
Innovation Solution
A hanger clamp with a clamping portion made of aluminum alloy and inserts composed of synthetic polymer with conductive charge, allowing sliding movement and electrical conductivity, reducing maintenance costs and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon/graphite composite inserts are used in hanger clamps, then electrical conductivity and alignment are improved, but production cost increases and brittleness occurs requiring regular maintenance
Solution Approach 1:
The patent applies composite materials by combining synthetic polymer (providing mechanical strength and sliding capability) with conductive charge (providing electrical conductivity). This composite insert material resolves the contradiction by achieving the electrical conductivity of carbon/graphite while avoiding its brittleness and high cost, as the polymer matrix provides resilience and the conductive charge provides the necessary electrical properties.
Solution Approach 2:
The patent changes the material parameters by transitioning from pure carbon/graphite to a composite of synthetic polymer with conductive charge. This parameter change allows the material to simultaneously exhibit electrical conductivity (through the conductive charge) and mechanical resilience (through the polymer matrix), thereby reducing maintenance requirements and production cost while maintaining reliability.
2Reliability
If carbon/graphite composite inserts are used in hanger clamps, then electrical conductivity and alignment are improved, but brittleness occurs requiring regular maintenance
Solution Approach 1:
The patent uses composite materials where the synthetic polymer matrix provides mechanical strength and resilience, eliminating the brittleness of pure carbon/graphite, while the dispersed conductive charge particles maintain the necessary electrical conductivity. This composite structure resolves the contradiction between electrical conductivity and mechanical strength.
Solution Approach 2:
The patent changes the material composition parameters by introducing a polymer matrix with appropriate mechanical properties and dispersing conductive charge within it. This parameter modification transforms the material from brittle (carbon/graphite) to resilient (polymer composite) while preserving electrical conductivity through the conductive charge component.
3Ease of operation
If insulating plastic materials are used in hanger clamps, then sliding movement is enabled, but electrical potential alignment between busbar and hanger clamp is lost
Solution Approach 1:
The patent employs composite materials where the synthetic polymer matrix enables sliding movement through its low friction properties, while the incorporated conductive charge restores electrical conductivity. This allows the insert to simultaneously provide sliding capability and maintain electrical potential alignment, resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent applies local quality by having different regions of the insert material serve different functions: the synthetic polymer phase provides sliding capability at the contact surfaces, while the conductive charge phase provides electrical conductivity for potential alignment. This local differentiation of material properties resolves the contradiction between sliding capability and electrical conductivity.
4Reliability
If metal busbars are used in rigid overhead catenary systems, then electrical conductivity is improved, but dimensional variations due to temperature changes cause local stress and deformations
Solution Approach 1:
The patent changes the material parameters of the hanger clamp inserts by using synthetic polymer with conductive charge, which has different thermal expansion characteristics compared to metal busbars. This parameter change allows the system to accommodate dimensional variations of the metal busbar due to temperature changes, reducing stress and deformations while maintaining electrical conductivity through the conductive charge.
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 hanger clamp achieves cost-effectiveness and resilience with sliding capability and electrical potential alignment, minimizing electrical arcs and deformation risks.
Implementation Method 1
the synthetic polymer allows sliding of the busbar relatively to the hanger clamp in the longitudinal direction
Implementation Method 2
each insert being also configured to conduct electricity between the base plate and the clamping portion
Data Source
Figure 1
Figure 2
AI summary
This hanger clamp (200) for holding a conductive profile (120) of a rigid overhead catenary system (100) belonging to a railtrack, comprises a clamping portion (220) configured to receive a base plate (122) of the conductive profile (120). The clamping portion (220) comprises two jaws (222) with a U profile each jaw defining a reception volume (V222). The hanger clamp (200) further comprises two inserts (230), each insert being received within a respective reception volume (V222) and being configured to be positioned between the corresponding jaw and the base plate while allowing sliding movements of the conductive profile relative to the hanger clamp along a longitudinal axis (A120) of the conductive profile, each insert being also configured to conduct electricity between the base plate and the clamping portion. According to the invention, the inserts (230) are made from a material comprising a synthetic polymer and a conductive charge.