Rail Welding Unit Layout That Relieves Stress on Unit Guides

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Solution Overview

Problem

Existing welding units for rail tracks face challenges in distributing high clamping forces effectively, leading to stress on the sub-unit mountings and unit guides, particularly due to the tong-like design where clamping cylinders are arranged above the unit guides.

Innovation Solution

The welding unit design decouples the unit guides from the force transmission by positioning the displacement cylinders between the sub-units, allowing the clamping cylinders to transmit longitudinal forces directly to the rail ends without stressing the unit guides. This design ensures that the unit guides only perform the guiding function without absorbing pulling or pressing forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If clamping cylinders are arranged above the unit guides in a tong-like design, then clamping force can be applied to the rail ends, but stress is imposed on the unit guides and sub-unit mountings

Engineering Contradiction:

Improveclamping forceVSAvoidstress on unit guides

Core Design Contradiction:

ForceVSStress or pressure

Solution Approach 1:

The welding unit is divided into two independent functional systems: a guiding system (unit guides) and a force transmission system (displacement cylinders and clamping cylinders). The unit guides are separated from the force transmission path, so they only perform guiding function without bearing pulling or pressing forces. The displacement cylinders are arranged between the sub-units with cylinder bodies connected to one sub-unit and piston rods connected to the other sub-unit, creating a direct force transmission path that bypasses the unit guides.

Inventive Principle:

Principle #1Segmentation

2Strength

If displacement cylinders are supported relative to a front-side transverse beam, then structural support is provided, but the transverse beam and its mountings must absorb high pulling forces

Engineering Contradiction:

Improvestructural supportVSAvoidpulling forces on transverse beam

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The displacement cylinders are extracted from the transverse beam support structure and repositioned between the sub-units. The cylinder bodies are connected to one sub-unit while the piston rods are connected to the other sub-unit, eliminating the need for the transverse beam to support these high-force components. This removes the transverse beam and its mountings from the force transmission path, significantly reducing the structural demands on these components.

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If unit guides are used for both guiding and force transmission, then structural simplicity is maintained, but the unit guides are subjected to combined loading that reduces reliability

Engineering Contradiction:

Improvestructural simplicityVSAvoidreliability of unit guides

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The unit guides are functionally segmented from the force transmission system. They are designed to perform only the guiding function, allowing the two sub-units to move relative to each other in the rail longitudinal direction without bearing pulling or pressing forces. This functional separation significantly improves the reliability of the unit guides by eliminating combined loading conditions that would otherwise require oversized, more complex guide structures.

Inventive Principle:

Principle #1Segmentation

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

This design enhances the structural integrity and stability of the welding unit by minimizing stress on the sub-unit mountings and unit guides, allowing for more efficient transmission of clamping forces and improved performance during welding operations.

Implementation Method 1

a first sub-unit (2) which is displaceable on unit guides (4) in a rail longitudinal direction relative to a second sub-unit (5) by means of displacement cylinders (3)

Methodology Applied

Scientific EffectHydraulic pressure to mechanical displacement: Hydraulic Press

Implementation Method 2

each sub-unit (2, 5) comprises clamping cylinders (11) that are arranged underneath the unit guides (4) and coupled to clamping jaws (12) for clamping the rails (14)

Methodology Applied

Scientific EffectHydraulic pressure to mechanical force: Hydraulic Press

Data Source

PatentUS12281448B2Welding unit for welding rails of a track

Publication Date: 2025.04.22 PLASSER & THEURER EXPORT VON BAHNBAUMASCHINEN GMBH

AI summary

A welding unit for welding rails of a track includes a first sub-unit which is displaceable on unit guides in a rail longitudinal direction relative to a second sub-unit by using displacement cylinders. Each sub-unit includes clamping cylinders disposed underneath the unit guides and coupled to clamping jaws for clamping the rails. The two sub-units are connected by the displacement cylinders in that a cylinder body of the respective displacement cylinder is connected to one sub-unit and a piston rod of the respective displacement cylinder is connected to the other sub-unit. Thus, it is not necessary to support the displacement cylinders relative to a transverse beam disposed at the front.