Paving Screed Width Detection Using Reference Elements
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Solution Overview
Problem
Conventional screeds for road finishers face issues with determining the working width accurately, especially when using extendable or widening parts, due to the complexity and susceptibility to errors in wireless identification systems, which can lead to incorrect signal reception and operational disruptions.
Innovation Solution
Attaching reference elements to side shifters that can be detected by sensor units, allowing for the measurement of the working width with minimal components and providing error notifications if signals are lost, using methods like ultrasound, radar, or optical signals, and configuring sensor units to measure distances directly from these reference elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If wireless identification devices are used to determine working width, then automation is improved, but reliability deteriorates due to signal errors and disruptions
Solution Approach 1:
The patent introduces reference elements as intermediary objects that reflect or emit signals to sensor units. These reference elements serve as reliable intermediaries between the sensor units and the side shifters, ensuring accurate signal transmission even in complex electromagnetic environments. The reference elements mediate the measurement process by providing stable, detectable signal sources that maintain reliability throughout the working width determination.
2Measurement precision
If multiple identification devices are attached to extension parts, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the screed into modular components (base screed, extension parts, side shifters) and places reference elements at specific segments (side shifters). This segmentation allows the system to determine working width by measuring distances between discrete reference elements rather than requiring identification devices on every component. The segmented approach maintains measurement precision while reducing overall device complexity.
Solution Approach 2:
The reference elements serve multiple functions: they act as signal sources for distance measurement, serve as reference points for working width calculation, and provide stable identification markers. This multi-functionality reduces the need for separate identification devices on each extension part, thereby reducing device complexity while maintaining measurement precision.
3Ease of operation
If reference elements are attached to side shifters, then ease of operation is improved, but manufacturing complexity increases
Solution Approach 1:
The reference elements are pre-attached to the side shifters during manufacturing, so that during operation, the operator simply needs to ensure the side shifters are properly installed. This preliminary action eliminates the need for operators to handle or install reference elements during operation, significantly improving ease of operation. The manufacturing complexity is confined to the assembly process, which is a one-time cost that is offset by the operational simplicity.
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 solution simplifies the operation of screeds, reduces errors, and ensures immediate detection of signal disruptions, allowing for precise working width determination and improved control system input, enhancing the reliability and user-friendliness of road finisher operations.
Implementation Method 1
The sensor unit and the reference element can be based on different measurement methods, e.g. As ultrasound
Implementation Method 2
using methods like ultrasound, radar, or optical signals
Implementation Method 3
optical measurement methods such. e.g. lasers
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
Paving screed (1) for use on a road paver (8). The paving screed (1) comprises a base screed (2) whose working width (26) can be changed by extendable extension sections (3, 4) and/or separate, removable widening sections (13, 14). Furthermore, the screed (1) comprises several side shifters (5, 6) which can each be mounted at the outer ends of the base screed (2) or the extension sections (3, 4) or the widening sections (13, 14) and which limit the working width (26), wherein at least one reference element (11, 12) for determining the working width (26) is provided on at least one of the side shifters (5, 6), and that the at least one reference element (11, 12) can be detected by sensor units (9, 10) when the side shifters (5, 6) are each mounted at the outer ends of the base screed (2) or the extension sections (2, 3) or the widening sections (13, 14).