Screed Plate Positioning via Laser Reference Plane
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Solution Overview
Problem
Existing systems for asphalt pavers lack an efficient method to accurately determine and adjust the relative position and parallelism between multiple screed plates, relying on cumbersome manual methods prone to operator error.
Innovation Solution
A system comprising sensors mounted on screed plates and a controller that creates a detectable physical phenomenon, such as a laser beam, to determine the relative position and parallelism between screed plates, with actuators for automatic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual methods are used to determine and adjust screed plate positions, then the system complexity is low, but the measurement precision and positioning accuracy deteriorate
Solution Approach 1:
A laser device is introduced as an intermediary to create a reference plane that sensors can detect. This mediator enables precise measurement of screed plate positions and parallelism without requiring complex direct measurement systems between plates
Solution Approach 2:
Manual mechanical measurement methods are replaced with an optical measurement system using lasers and sensors. This substitution dramatically improves measurement precision while the modular sensor system keeps the added complexity manageable
2Measurement precision
If automated sensor systems are implemented to determine screed plate positions, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The sensor system is designed to perform multiple functions: detecting the laser reference plane, determining absolute positions, calculating relative positions, and measuring parallelism between plates. This multi-functionality reduces the need for separate measurement systems for each parameter
Solution Approach 2:
The laser device creates an optical copy or reference model of the desired parallel plane configuration. Sensors detect this optical reference to determine actual plate positions, allowing the system to compare actual vs. ideal positions without complex mechanical gauges
3Productivity
If manual adjustment methods are used for screed plates, then the system simplicity is maintained, but the productivity and adjustment speed deteriorate
Solution Approach 1:
The controller receives real-time position data from sensors and automatically adjusts screed plate positions based on detected deviations from the reference plane. This closed-loop feedback system enables rapid automated correction without manual intervention
Solution Approach 2:
The system performs self-adjustment of screed plate positions using automated actuators controlled by the controller. The system serves itself by detecting position errors and correcting them without requiring operator action, significantly improving adjustment speed
4Productivity
If automated positioning systems are implemented, then the productivity improves, but the ease of operation deteriorates due to system complexity
Solution Approach 1:
The automated positioning system operates autonomously, with sensors continuously monitoring plate positions and the controller automatically making adjustments. This self-service operation eliminates the need for operators to manually measure and adjust plates, improving productivity while the system handles the complexity internally
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
Enables precise, automated, and real-time determination and adjustment of screed plate positions, improving paving accuracy and efficiency by eliminating manual errors and enhancing operational precision.
Implementation Method 1
The device can be configured to create a physical phenomenon that is detectable by the first plurality and the second plurality of sensors
Data Source
AI summary
A system for a screed assembly of a paving machine can include a plurality of screed plates, a screed frame, a first plurality of sensors, a second plurality of sensors, a device and a controller. The device can be configured to create a physical phenomenon that is detectable by the first plurality and the second plurality of sensors. The controller can be configured to, based on a detected position of each of the rust plurality of sensors and each of the second plurality of sensors relative to the physical phenomenon, determine a relative position between the first screed plate and the second screed plate including a degree of parallelism between the major surface of the first screed plate and the major surface of the second screed plate.