Concrete Mixer Drum Speed Control for Target Slump Delivery
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Solution Overview
Problem
Concrete mixer vehicles face challenges in maintaining optimal concrete properties during transportation due to passive control of drum rotation speed, leading to undesirable concrete properties upon arrival at the job site.
Innovation Solution
A drum control system that actively controls the rotation and rotational speed of the mixing drum based on real-time data from sensors, adjusting the speed to achieve target properties for the concrete mixture, such as consistency and slump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive control of drum rotation speed is used, then the system is simple to operate, but the concrete properties become undesirable upon arrival at the job site
Solution Approach 1:
The system employs sensors to continuously monitor concrete properties during mixing and transportation, feeding this data back to the control system which adjusts drum rotation speed accordingly. This closed-loop feedback mechanism ensures concrete maintains desired properties throughout the process, resolving the contradiction between reliability and complexity by making the complexity worthwhile through significant improvement in concrete quality consistency
Solution Approach 2:
The control system dynamically changes the drum rotation speed parameter based on real-time concrete property measurements and environmental conditions. By adjusting this critical parameter, the system maintains optimal mixing conditions throughout transportation, preventing concrete setting and ensuring consistent delivery quality, thus improving reliability while accepting controlled complexity
2Stability of the object's composition
If the drum rotates at high speed continuously, then mixing is effective, but concrete may set prematurely upon arrival
Solution Approach 1:
The system dynamically adjusts drum rotation speed based on the mixing stage and transportation conditions rather than maintaining a constant high speed. During active mixing, higher speeds ensure homogeneity, while during transportation, the system reduces speed to prevent premature setting. This dynamic adaptation resolves the contradiction by making mixing effectiveness and setting time control compatible through temporal separation of functions
Solution Approach 2:
The system performs preliminary mixing at high speed to achieve desired homogeneity before transportation begins, then transitions to lower speeds during transit to preserve the mixed state and prevent setting. This preliminary action approach ensures concrete composition stability is achieved early, allowing subsequent slower operation without compromising quality, thus resolving the time loss issue
3Reliability
If the drum rotates at low speed, then concrete setting is prevented, but mixing effectiveness is reduced
Solution Approach 1:
The system employs periodic high-speed mixing intervals followed by lower-speed transportation phases. During loading and initial mixing, the drum rotates at high speed to ensure thorough mixing and homogeneity. During transportation, it transitions to lower speeds to prevent setting. This periodic alternation resolves the contradiction between mixing efficiency and setting prevention by allocating high-speed operation to mixing phases and low-speed operation to transportation phases
Data Source
AI summary
A drum control system includes one or more processing circuits having programed instructions to control a drum assembly to rotate a drum at a first, unmixed speed to mix drum contents received by the drum where the drum contents including ingredients of a concrete mixture, acquire drum contents data indicative of a property of the drum contents from a mixture sensor and monitor the property of the drum contents as the drum rotates, acquire a target property for the drum contents upon delivery, determine a second, mixed speed based at least partially on the target property, and control the drum assembly to rotate the drum at the second, mixed speed in response to determining that the property of the drum contents indicates that the ingredients have been sufficiently mixed.