Composite Rail Profile with Welded Insert Rods
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Solution Overview
Problem
Existing composite conductor rails face issues with the detachment of profile strips from carrier profiles under high load, leading to surface corrugation and defects in the metallic connection, which affects the durability and reliability of the power transmission system.
Innovation Solution
A composite profile design featuring a carrier profile extrusion-moulded from alloy material with a profile strip of harder metal, where insert rods are attached parallel to the longitudinal axis and engage in lateral slots of the carrier profile, creating a weld seam and mechanical pretension to ensure a firm connection, and the profile strip is made of special steel for enhanced mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal metallic connection is formed between the carrier profile and profile strip during extrusion, then the connection is initially secure, but under high load the profile strip detaches from the carrier profile in the long term
Solution Approach 1:
The slot is pre-formed in the carrier profile before the profile strip is installed. This preliminary preparation allows the insert rod to be securely positioned and welded in advance, creating a robust mechanical connection that can withstand long-term high load conditions without detachment
Solution Approach 2:
The insert rod is nested within the slot of the carrier profile and welded to the profile strip. This nested configuration creates a layered, interlocking structure where the insert rod acts as an anchor, the slot provides containment, and the profile strip spans the surface, forming a hierarchical connection system that enhances reliability under load
2Ease of manufacture
If conventional production methods are used to attach the profile strip, then the connection can be achieved, but surface corrugation and defects occur on the cover profile
Solution Approach 1:
The welding process is extracted and localized to specific points at the ends of the insert rod within the slot, rather than applying widespread caulking or punching across the entire profile strip. This localized approach eliminates the cause of surface corrugation while maintaining the structural integrity of the connection
Solution Approach 2:
The insert rod serves as an intermediary element between the carrier profile and the profile strip. It provides a mechanical anchor that transfers loads without requiring direct contact or forceful attachment methods that would cause surface defects on the profile strip
3Reliability
If lateral through bolts or push elements are used to attach the wearing component, then the connection can be achieved, but the device complexity increases
Solution Approach 1:
The insert rod combines multiple functions into a single component: it acts as an anchor in the slot, provides a welding surface for the profile strip, and serves as a mechanical connector between the carrier profile and the profile strip. This merging eliminates the need for separate bolts, nuts, or push elements, reducing component count while maintaining connection strength
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 permanently secure connection between the carrier and profile strips, enhancing mechanical stability, reducing wear, and maintaining economic production processes while minimizing installation height tolerance and surface defects.
Implementation Method 1
is connected with its profile strip by way of a weld seam
Data Source
AI summary
A composite profile comprising: (1) an extruded metal alloy carrier profile comprising a rail head having a longitudinal axis B, the rail head comprises a surface and two longitudinal edges extending parallel to the longitudinal axis B and (2) a metal channel shaped profile strip comprising a base portion spanning the surface of the rail head and parallel side legs which lie on the longitudinal edges of the head rail, an insert rod is provided on the parallel side legs which lie on the longitudinal edges of the head rail and engage in lateral slots provided in the two longitudinal edges of the rail head, wherein the profile strip is attached to the carrier profile under mechanical pretension by way of a weld scan.