Liquid Proportion Control in Paving Material Mixing
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Solution Overview
Problem
Existing machines used for recycling and mixing paving materials face challenges in achieving a desired composition of the mixed material, particularly in controlling the moisture content, which is crucial for achieving optimal compaction and service as a support substrate for roads and parking lots, often relying on manual calculations and guesswork.
Innovation Solution
A machine with a control system that monitors ground speed and working depth to adjust the liquid delivery mechanism, ensuring the right proportion of liquid is applied to the substrate, using sensors and actuators to autonomously control the liquid dispensing based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual calculations and guesswork are used to control liquid application, then device complexity is reduced, but manufacturing precision and reliability of achieving desired material composition deteriorates
Solution Approach 1:
The system employs sensors to detect actual liquid content in the substrate material and feeds this information back to the control mechanism, which automatically adjusts the liquid delivery mechanism to achieve the desired liquid content proportion, eliminating manual calculations and guesswork
Solution Approach 2:
The patent replaces manual mechanical control methods with an automated control system that uses sensors, actuators, and electronic controls to regulate liquid delivery, substituting human judgment with objective measurement and automatic adjustment mechanisms
2Productivity
If liquid delivery is controlled manually, then ease of operation is improved, but productivity and consistency of material composition deteriorates
Solution Approach 1:
The control system automatically monitors and adjusts liquid delivery based on real-time detection of liquid content in the material, allowing the system to self-regulate without continuous manual intervention, thereby maintaining consistent material composition while improving processing efficiency
Solution Approach 2:
By implementing closed-loop feedback control where sensors monitor liquid content and the control mechanism automatically adjusts delivery rates, the system achieves consistent productivity and material composition without requiring manual adjustment for each variation in operating conditions
3Adaptability or versatility
If fixed liquid application rate is used, then device complexity is reduced, but adaptability to varying soil types and conditions deteriorates
Solution Approach 1:
The liquid delivery system transitions from fixed to dynamic control, where the liquid delivery mechanism continuously adjusts its operation based on real-time feedback from sensors detecting substrate conditions, enabling adaptation to varying soil types and moisture content while maintaining manageable system complexity through automated regulation
Data Source
AI summary
A machine includes a material working mechanism movable relative to a frame to vary working depth of the material working mechanism. A control system monitors certain parameters, and controls a liquid dispensing mechanism to control application of a liquid such as water or an emulsion to be applied to material being worked by the material working mechanism based upon the parameters. The control system functions to produce a desired proportion of the liquid such as a liquid percent density in worked material.