Auger and Conveyor Speed Control for Paving Consistency
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Solution Overview
Problem
Existing paving machines face challenges in maintaining consistent material delivery and quality due to complex control systems and variations in ground surface conditions, which can lead to erratic auger behavior and inconsistent mat formation.
Innovation Solution
A paving machine with a material depth sensor and controller that adjusts conveyor speed based on auger speed and material depth, ensuring a consistent volume of paving material is delivered to the screed, maintaining auger speed within an ideal range to prevent material segregation and maintain mat consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complex control system with multiple sensors is used to accurately control auger and conveyor rotational speeds, then material delivery consistency is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes unnecessary sensors from the control system. Instead of using multiple sensors to detect material feed conditions, the invention uses a simplified approach that relies on the inherent relationship between conveyor speed and auger speed, eliminating complex sensing requirements while maintaining material delivery consistency.
Solution Approach 2:
The control system is designed to perform multiple functions using a single sensor. The material level sensor serves both to detect material presence and to infer material feed conditions, replacing what would traditionally require multiple specialized sensors. This multi-functional approach reduces system complexity while maintaining control accuracy.
2Adaptability or versatility
If ground surface conditions vary, then adaptability is improved, but material delivery consistency deteriorates due to erratic auger behavior
Solution Approach 1:
The patent implements a feedback control mechanism where the material level sensor continuously monitors material conditions and provides feedback to the controller. The controller adjusts conveyor and auger speeds based on this feedback, ensuring consistent material delivery to the screed regardless of ground surface variations. This closed-loop control prevents erratic auger behavior and maintains mat formation consistency.
Solution Approach 2:
The control system dynamically adjusts the operational parameters of the conveyor and auger based on real-time material level detection. Rather than operating at fixed speeds, the system continuously adapts conveyor and auger rotational speeds to maintain optimal material feed conditions, enabling consistent performance across varying ground conditions.
3Productivity
If conveyor speed is increased to improve productivity, then material delivery rate is improved, but auger loading consistency deteriorates
Solution Approach 1:
The system dynamically coordinates conveyor and auger speeds to maintain consistent material delivery. When productivity needs to be increased, both speeds are adjusted proportionally while maintaining their optimal ratio, ensuring that the auger remains properly loaded without overloading or underloading. This dynamic coordination allows productivity improvement while preserving loading consistency.
Solution Approach 2:
The material level sensor provides continuous feedback on material feed conditions to the controller. This feedback enables the controller to adjust conveyor and auger speeds in a coordinated manner, ensuring that increases in conveyor speed are matched by appropriate auger speed adjustments to maintain consistent loading. This prevents the auger from becoming overloaded or underloaded during high-productivity operation.
Data Source
AI summary
A paving system includes a paving machine including a drive assembly, a paving material delivery system, and a material depth sensor. The paving material delivery system includes a hopper, a conveyor assembly, an auger, and a screed. The material depth sensor is configured to detect a head of paving material in front of the screed. The paving machine further includes a controller in communication with the material depth sensor. The controller is configured to receive a feed sensor signal from the material depth sensor, receive an auger speed signal indicative of a speed of the auger, and adjust a conveyor speed based on at least one of the feed sensor signal and the auger speed signal.