Paving Screed Extension Sole Plate Height Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for maintaining the lateral position of the transition between a paving lane and a slope during paving are complex and prone to failure due to the need to process multiple information signals, making them unreliable.

Innovation Solution

A method that measures the height difference between a fixed point on the base screed and a reference line on the extension screed, stores this as a target value, and automatically adjusts the extension screed's sole plate to maintain the lateral position by correcting deviations from this target value, minimizing the information required and processed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple information signals are processed to maintain lateral position of the transition, then the lateral position can be maintained, but the regulating system becomes complicated and prone to failure

Engineering Contradiction:

Improvereliability of maintaining lateral positionVSAvoidcomplexity of regulating system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts only the essential height difference information needed to maintain lateral position, discarding other unnecessary signal processing. By measuring solely the height difference between the base screed and extension screed, the system avoids the complexity of processing multiple information signals while maintaining reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses a simplified measurement approach that copies only the critical geometric relationship (height difference) rather than replicating complex multi-signal processing. This single height difference measurement serves as a sufficient copy of the necessary control information.

Inventive Principle:

Principle #26Copying

2Reliability

If multiple information signals are processed to maintain lateral position, then the lateral position can be maintained, but the system becomes prone to failure

Engineering Contradiction:

Improvestability of lateral position maintenanceVSAvoidcomplexity of signal processing

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using multiple sensors and complex signal processing to determine position, the patent inverts the approach by using a single height difference measurement as the primary control parameter. This inversion simplifies the system while improving stability.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If the extension screed is adjusted for height and angle independently, then precise control is achieved, but the adjustment mechanism becomes more complex

Engineering Contradiction:

Improveprecision of sole plate positioningVSAvoidcomplexity of adjustment mechanism

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges the height adjustment and angle adjustment functions into a unified control system based on single height difference measurement. By combining these functions and controlling them through one measurement parameter, the system achieves precise positioning while reducing mechanical complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The height adjustment assemblies serve multiple functions: they control both the height position and the angle of the extension screed sole plate. This multi-functionality reduces the need for separate adjustment mechanisms, simplifying the overall system while maintaining precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8221025B2Method for laying a paving mat

Publication Date: 2012.07.17 JOSEPH VOEGELE AG

AI summary

According to a method for laying a paving mat with a paving screed, the paving mat comprising a lane and a downwardly inclined slope beginning at a transition to the outside, the paving screed comprising a base screed and at least one extension screed which is extendable and retractable by a sliding motion in a sliding direction parallel to the base screed for varying the working width of the paving screed, the base screed and the extension screed having sole plates at the lower sides, with the sole plate of the extension screed being inclined laterally for forming the slope with the angle of the slope, a lateral position of the transition is first set relative to the base screed, during or after setting the lateral position a height difference is measured perpendicular to the planum between a fixed measuring location at the base screed and a location along a reference line extending parallel to the sole plate of the extension screed, the measured height difference being converted into a target value, and in the case of a variation of the working width and/or of the angle an occurring deviation of the height difference from the target value as caused by the variation is measured and automatically is corrected by a simultaneous height adaptation of the sole plate of the extension to the target value in order to maintain the set lateral position of the transition stationary.