Powder Mixing Measurement With Rotator Speed Feedback Control
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Solution Overview
Problem
Existing rotary compression-molding machines face issues with inconsistent flow rates and mixing accuracy of powdery materials, leading to production failures, defective products, and increased downtime due to unbalanced material supply and measurement inaccuracies.
Innovation Solution
A powdery-material mixing degree measurement device that adjusts the rotational speed of the rotator and turret to maintain a constant upper surface level of powdery materials, ensuring accurate analysis and preventing material shortages or overflows by removing defective materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the rotator is increased to increase the flow rate of powdery material, then the productivity is improved, but the measurement precision of the mixing degree deteriorates due to density variations
Solution Approach 1:
The rotator's rotational speed is made dynamically adjustable rather than fixed. The control unit continuously monitors the upper surface level of powdery material and adjusts the rotational speed in real-time to maintain a constant level, ensuring consistent material density for accurate NIR measurement while adapting to varying flow rate requirements for different productivity levels.
Solution Approach 2:
A feedback control system is implemented where the upper surface level detector continuously measures the material level in the rotator, and the control unit uses this information to adjust the rotational speed accordingly. This closed-loop feedback ensures that the material density remains constant despite changes in overall system productivity requirements, thereby maintaining measurement precision.
2Loss of time
If the rotational speed is adjusted to balance material supply and usage, then the loss of time due to production stoppage is reduced, but the stability of the powdery material level deteriorates
Solution Approach 1:
The system dynamically adjusts the rotational speed of the rotator based on real-time material level feedback. By continuously monitoring the upper surface level and adapting the rotational speed, the system maintains stable material levels even when rotational speed changes are needed to balance supply and usage rates, preventing both material shortages and overflows.
3Measurement precision
If the upper surface level of powdery material is kept constant, then the measurement precision is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The rotator serves a dual function: it both transports the powdery material and maintains the material level through its controlled rotation. The system uses the existing rotator structure and adds only a level detector and control unit, allowing the rotator to self-regulate the material level through its rotational speed adjustments, thereby minimizing additional device complexity.
4Productivity
If the rotational speed is increased to prevent material shortage, then the productivity is improved, but the harmful factors increase due to material overflow and segregation
Solution Approach 1:
The rotational speed is dynamically optimized to prevent both material shortage and overflow. By continuously adjusting the speed based on level feedback, the system maintains the material level within optimal ranges, preventing segregation caused by excessive speed while avoiding shortages that would require production stoppage, thereby eliminating harmful effects while maintaining high productivity.
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
Maintains high analysis accuracy and stabilizes the quality of molded products by controlling the rotational speed of the rotator and turret, reducing production defects and downtime.
Implementation Method 1
measure a powdery-material mixing degree in accordance with near infrared reflectance (NIR), a near infrared absorption spectrum method
Implementation Method 2
measure a powdery-material mixing degree in accordance with near infrared reflectance (NIR), a near infrared absorption spectrum method
Implementation Method 3
a gravity feeder configured to simply drop a powdery material into a die bore
Implementation Method 4
an agitated feeder configured to drop, into the die bore, a powdery material being agitated by rotating an incorporated agitating rotor
Implementation Method 5
the paired upper and lower punches pass between an upper roll and a lower roll to compression mold a powdery material filled in the die bores
Data Source
AI summary
A powdery-material mixing degree measurement device includes a supplier configured to be fed with a mixed-powdery materials, a discharger configured to discharge to feed, with the mixed-powdery materials, a filling device configured to fill a die bore of the compression-molding machine with a powdery material, a rotator including a plurality of movable portions and configured to capture the mixed-powdery materials fed through the supplier and to transfer the mixed-powdery materials to the discharger a first sensor configured to measure a mixing degree of the mixed-powdery materials captured by the movable portions of the rotator, a second sensor configured to detect whether or not the mixed-powdery materials in the supplier have an upper surface level kept within a constant target range, and a controller configured to adjust rotational speed of the rotator such that the upper surface level of the mixed-powdery materials in the supplier is kept within the constant target range.