Grinding Mill Fullness Measurement via Bolt-Mounted Sensors
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Solution Overview
Problem
Existing methods for determining the degree of fullness in large grinding mill drums are unreliable and lack sufficient measurement accuracy, making it challenging to control grinding efficiency and energy consumption effectively.
Innovation Solution
A method and apparatus using force transducers and accelerometers attached to lifting bar bolts to measure reactions and angles, allowing for direct calculation of the degree of fullness, with data processing and transmission units for wireless data acquisition and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weighing equipment is used to measure the degree of fullness, then measurement data can be obtained, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces mechanical weighing equipment with a sensor-based measurement system. Force transducers and accelerometers are mounted on lifting bar bolts to measure reactions and calculate the degree of fullness through signal processing, eliminating the need for complex mechanical weighing devices while achieving reliable measurement.
Solution Approach 2:
The patent introduces force transducers and accelerometers as intermediary sensors that indirectly measure the degree of fullness by detecting reactions on the lifting bar bolts. These sensors convert mechanical reactions into electrical signals that are processed to determine the charge volume, providing a less complex alternative to direct weighing.
2Measurement precision
If complex calibration processes are implemented, then measurement accuracy improves, but the ease of operation and time consumption worsen
Solution Approach 1:
The measurement system is designed to automatically calculate the degree of fullness based on signals from the force transducers and accelerometers. The system processes the sensor data through defined calculation steps without requiring manual calibration interventions, making the operation simpler and faster while maintaining accuracy.
3Reliability
If force transducers and accelerometers are used, then measurement reliability improves, but the device complexity increases
Solution Approach 1:
The force transducers and accelerometers are mounted on the lifting bar bolts, which are existing components of the grinding mill. This approach utilizes the existing structural elements for dual purposes: mechanical support and sensor mounting, thereby reducing overall device complexity while achieving reliable measurements through the sensor arrangement.
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
Provides reliable and sensitive measurements of the degree of fullness, enabling precise control of grinding mill operations and reducing the need for costly weighing equipment and complex calibration processes.
Implementation Method 1
measuring force measurement data from reactions caused by the grinding material, said reactions subjected to an at least one lifting bar and to an at least one lifting bar bolt of the grinding mill, using at least one force transducer
Implementation Method 2
also position/angle measurement data on the position and/or the angle or rotation of the at least one lifting bar bolt of the grinding mill, using at least one accelerometer) and/or inclinometer
Data Source
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AI summary
The present invention relates to the field of mineral and metallurgical processes, to disintegrating in general and to disintegrating by tumbling mills, and more particularly to a method and arrangement for determining a degree of fullness of a large grinding mill drum, and to a large grinding mill drum. An arrangement for determining a degree of fullness of a large grinding mill drum according to the present invention has a sensor arrangement (13), (18), (28), (29), (30) attached to at least one lifting bar bolt (7) of an at least one lifting bar (5) of the grinding mill, said sensor arrangement (13), (18), (28), (29), (30) having an at least one force transducer (9), (25) attached to said at least one lifting bar bolt (7). With the help of the measurement arrangement according to the present invention more reliable measurement data can be provided for the determination of the degree of fullness of a large grinding mill drum.