Paving Screed Height and Inclination Adjustment
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Solution Overview
Problem
Existing paving screeds face challenges in maintaining a stationary transition between a lane and a slope while varying the working width, due to torsion and high forces that hinder uniform extension or retraction of extension screeds, leading to surface irregularities and width changes.
Innovation Solution
A paving screed design with structurally and functionally separated adjustment assemblies for height and lateral inclination, allowing independent control and coordination of adjustments to maintain the transition's stability, using a multiple point suspension and actuator systems to manage torsion and forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If extension screeds are extended or retracted to vary working width, then the working width is adjusted, but the base screed undergoes significant torsion and the transition position changes
Solution Approach 1:
The screed is divided into a base screed and separate extension screeds that can be independently extended or retracted. The extension screeds are supported by separate guiding assemblies with multiple point suspensions, allowing them to move independently without causing torsion to the base screed. This segmentation isolates the width adjustment function from the base screed structure.
Solution Approach 2:
Guiding assemblies with multiple point suspensions act as intermediaries between the extension screeds and the base screed. These guiding assemblies absorb and manage the forces and movements, preventing direct transmission of torsional forces to the base screed while enabling smooth extension and retraction of the extension screeds.
2Manufacturing precision
If height adjustment assemblies are used to maintain transition position, then the transition position is stabilized, but the device complexity increases
Solution Approach 1:
The guiding assemblies with multiple point suspensions serve multiple functions: they support the extension screeds during extension/retraction, manage forces and friction, and provide a stable mounting structure for height adjustment assemblies. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity while maintaining transition position stability.
Solution Approach 2:
The height adjustment assemblies are integrated with the guiding assemblies rather than being separate independent systems. The adjustment assemblies engage with the extension guiding structure and work in coordination with the multiple point suspension system, combining multiple adjustment functions into a unified structure that reduces complexity.
3Ease of operation
If multiple point suspension is used to support extension screeds, then uniform extension and retraction are enabled despite torsion and forces, but the device complexity increases
Solution Approach 1:
The multiple point suspension system provides localized support at multiple discrete points along the extension screed. Each suspension point is independently designed to handle specific local forces and friction conditions, allowing the extension screed to move uniformly despite varying forces along its length. This localized approach to support distributes the complexity across multiple simple, identical modules.
Data Source
AI summary
A paving screed comprises a base screed and extension screeds each of which is support via an extension guiding structure at a guidance fixed in the base screed such that each extension screed can be extended and retracted. A multiple point suspension is provided between the extension guiding structure and the guidance. A frame carrying the sole plate of the extension screed A is arranged below the extension guiding structure. Substantially vertical adjustment assemblies make it possible to adjust the height position of the frame via drives. A lateral inclination adjustment assembly is provided structurally separated from the adjustment assemblies either for the frame or within the frame for the sole plate of the extension screed.