Screed Assembly Hinge Seal for Asphalt Paving Maintenance

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Solution Overview

Problem

The existing screed assemblies in paving machines face issues with hot asphalt sticking to mechanical fasteners and heating elements, making it difficult to replace them and potentially causing damage during removal.

Innovation Solution

A screed assembly with a hinge assembly and a seal member that covers the gap between its sections, along with heating components attached to both sections, and a wiper and wear bar to restrict the seal member's movement, preventing asphalt ingress and facilitating easy maintenance and replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If the screed assembly uses mechanical fasteners to attach heating elements, then the heating elements can be easily replaced, but hot asphalt sticks to the fasteners making removal difficult and potentially damaging

Engineering Contradiction:

Improveease of replacement of heating elementsVSAvoidasphalt sticking to fasteners

Core Design Contradiction:

Ease of repairVSObject-affected harmful factors

Solution Approach 1:

The screed assembly is divided into two separable sections (first section and second section) that can be moved relative to each other. This segmentation allows the gap between sections to be controlled and sealed, preventing asphalt from reaching the fasteners while maintaining the modular structure for easy heating element replacement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A seal member is introduced as an intermediary component between the first and second sections. This seal member covers the gap between sections and extends laterally beyond the gap, acting as a barrier that prevents hot asphalt from reaching the mechanical fasteners and heating elements while allowing the sections to move relative to each other.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the screed assembly has a hinge assembly allowing sections to rotate, then the screed can accommodate crowning motion and impart slope, but hot asphalt enters through the gap between sections and sticks to components

Engineering Contradiction:

Improveability to impart slope to paving surfaceVSAvoidasphalt ingress through gap

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The seal member serves as an intermediary barrier between the movable sections. It is positioned to cover the gap created by the hinge assembly's rotation, preventing asphalt from entering the gap while allowing the sections to rotate and adjust for crowning motion and slope implementation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The seal member functions as a flexible barrier that can accommodate the relative movement and rotation of the screed sections. It flexes with the hinge assembly's motion while maintaining its sealing function to prevent asphalt ingress through the gap between sections.

Inventive Principle:

Principle #30Flexible shells and thin films

3Speed

If the gap between sections is left open for hinge movement, then the screed assembly can pivot smoothly, but asphalt material enters the gap and causes sticking and damage

Engineering Contradiction:

Improvesmoothness of pivoting motionVSAvoidprotection of heating elements from damage

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The seal member is positioned as an intermediary between the gap and the internal components. It allows the gap to remain open for smooth pivoting motion while preventing asphalt from entering and causing sticking or damage to heating elements and fasteners.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sealing function is extracted from the hinge assembly itself and implemented through a separate seal member. This allows the hinge assembly to focus on providing smooth pivoting motion while the seal member independently handles the protection function, preventing asphalt ingress.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Prevents asphalt from entering the gap and sticking to heating elements, allowing for easier replacement and maintenance, reducing damage and downtime, and ensuring consistent temperature control.

Implementation Method 1

a seal member located between the hinge assembly and the main screed unit covering a gap defined between the first section and the second section below the hinge assembly

Methodology Applied

Scientific EffectPhysical barrier sealing: Physical Containment

Implementation Method 2

The screed assembly has electrical heating elements that heat the screed assembly to the necessary temperature for paving

Methodology Applied

Scientific EffectElectrical heating: Joule Heating

Data Source

PatentUS9777445B1Screed assembly for paving machine

Publication Date: 2017.10.03 CATERPILLAR PAVING PROD INC

AI summary

A screed assembly for a paving machine includes a main screed unit having a first section and a second section. A hinge assembly located above the main screed unit pivotally couples the first section with the second section. The first section and the second section rotate around a horizontal axis passing through the hinge assembly. A seal member located between the hinge assembly and the main screed unit covers a gap defined between the first section and the second section below the hinge assembly such that the seal member covers the gap and laterally extends beyond the gap above the first section and the second section. A pair of heating components attached to the first section and the second section heats the first section and the second section.