Screed Assembly Functional Coupling for Paving Uniformity
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Solution Overview
Problem
Existing road paver screed assemblies face challenges in maintaining uniform compaction and paving width due to height and tilting angle discrepancies between main and secondary screeds, leading to uneven pavement installation.
Innovation Solution
A screed assembly with a main screed and a secondary screed, where the height adjustment device and tilting device are functionally coupled to automatically adjust the secondary screed's position and angle in relation to the main screed, ensuring synchronized lowering or raising of the screed plate carrier and tilting axis to maintain uniform compaction and adjust paving width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the secondary screed is adjusted independently for height and tilting angle, then the adjustment flexibility is improved, but the operation complexity and error rate increase
Solution Approach 1:
The patent combines the height adjustment device and tilting device into a functionally coupled system where a single actuation input simultaneously controls both the height of the screed plate carrier and the tilting angle of the secondary screed plate. This merging of control functions reduces operational complexity while maintaining adjustment flexibility, as operators only need to control one parameter (height) and the system automatically adjusts the other (tilting angle) accordingly.
2Device complexity
If manual adjustment of secondary screed is used, then device complexity is reduced, but manufacturing precision and paving uniformity deteriorate
Solution Approach 1:
The functionally coupled adjustment system incorporates implicit feedback mechanisms where the position and angle of the secondary screed are continuously monitored and automatically adjusted in response to changes in the main screed position. This feedback loop ensures that the secondary screed maintains proper alignment and compaction characteristics relative to the main screed, achieving uniform paving results without requiring complex independent control systems for each parameter.
3Measurement precision
If height and tilting angle are adjusted separately, then control precision is improved, but adjustment time and productivity decrease
Solution Approach 1:
The functionally coupled adjustment system enables continuous simultaneous adjustment of both height and tilting angle through a single actuation input. Rather than requiring separate discrete adjustment operations for each parameter, the system performs both adjustments continuously and automatically in one coordinated motion, significantly reducing the total adjustment time while maintaining precise control over both parameters through the coupled mechanical or hydraulic transmission mechanism.
Data Source
AI summary
A screed assembly for a road paver comprises a main screed and a secondary screed. The main screed comprises a main screed plate for contact with paving material. The secondary screed comprises a screed plate carrier and a secondary screed plate for contact with the paving material. The secondary screed plate is attached to the screed plate carrier so as to be tiltable about a tilting axis. The screed assembly comprises a height adjustment device configured to lower or raise the screed plate carrier relative to the main screed. The screed assembly further comprises a tilting device configured to change a tilting angle of the secondary screed plate about the tilting axis.


