Tumbling Mill Vibration Feedback for Toe Position Control
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Solution Overview
Problem
Existing tumbling mills face inefficiencies in grinding processes due to energy waste from non-breaking particle impacts and unstable operation, necessitating real-time monitoring to balance feed rates and maintain optimal internal states.
Innovation Solution
A method and system for generating and analyzing position and vibration signals to detect impact forces and temporal relations, using sensors to monitor the internal state of a tumbling mill, and providing a graphical user interface for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If real-time monitoring and control systems are implemented to balance feed rates and maintain optimal internal states, then grinding efficiency and production quality are improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a closed-loop control system where vibration sensors continuously monitor the mill's internal state, and this feedback is processed by a control system that adjusts feed rates in real-time. This feedback mechanism enables the system to maintain optimal grinding conditions dynamically, resolving the contradiction by making the control system adaptive rather than static.
Solution Approach 2:
The control system utilizes the mill's own vibration characteristics as the monitoring signal, eliminating the need for external or complex monitoring equipment. By self-diagnosing its internal state through inherent vibration patterns, the system reduces complexity while maintaining high grinding efficiency.
2Measurement precision
If vibration sensors and signal analysis systems are used to detect impact forces and monitor internal state, then measurement precision and control accuracy are improved, but device complexity increases
Solution Approach 1:
The patent uses vibration sensors as intermediaries that convert mechanical impact forces into electrical signals for analysis. This intermediary approach allows precise measurement of internal mill conditions without requiring direct access to or complex instrumentation of the grinding chamber itself.
Solution Approach 2:
The system replaces direct mechanical measurement methods with vibration-based sensing and signal processing. By substituting mechanical observation with vibrational analysis, the system achieves higher measurement precision while reducing the complexity of physical monitoring equipment.
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
Improves grinding efficiency by optimizing feed rates and maintaining optimal internal states, reducing energy consumption and enhancing production quality.
Implementation Method 1
a first vibration sensor (70) coupled to said rotating shell (20) for producing a first measuring signal (SEA) dependent on mechanical vibrations (VIMP) generated when a protrusion (310) interacts with a toe portion (205) of the material charge (30)
Data Source
AI summary
A system for controlling an internal state of in a tumbling mill (10) having a shell (20) that rotates around an axis (60) at a speed of rotation (fROT) for grinding a charge of material (30) by tumbling the material in the rotating shell; said shell (20) having an internal shell surface (22) including a first number (L) of protrusions (310) configured to engage material as the shell (20) rotates about the axis (60), the system comprising a status parameter extractor (450) being configured to detect occurrence of an event signature (Sp(r); Sp) in a time sequence of vibration sample values (Se(i), S(j), S(q)); said status parameter extractor (450) being configured to generate data indicative of a first temporal relation (RT(r); TD; FI(r)) between said said event signature occurrence, and two other occurrences; and a regulator for controlling an angular toe position (FI(r), ATOE) based on a toe position reference value (FIREF(r)), said first temporal relation (Rr(r); TD; FI(r)), and a toe position error value (FIERR(r)).