Automated Calibration System for Rotary Tablet Press Measurement Accuracy
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Solution Overview
Problem
Current calibration and adjustment methods for measuring devices in rotary tablet presses are manual, time-consuming, prone to errors, and fail to account for local deviations and non-linearities caused by machine tolerances and operational variables like temperature fluctuations and wear.
Innovation Solution
A device and method utilizing a control device connected to both the measuring device and a reference measuring device to automatically generate and compare reference measurement events, adjust the measuring device for impermissible deviations, and document the process, allowing for precise and rapid calibration and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration and adjustment methods are used, then the process can be performed with simple equipment, but the calibration is time-consuming and prone to human errors
Solution Approach 1:
The measuring device automatically performs calibration by comparing its measurements with a reference measuring device under controlled test conditions. The control device automatically adjusts the measuring device based on the comparison, eliminating the need for manual operator intervention and significantly reducing calibration time while maintaining precision.
Solution Approach 2:
The manual mechanical calibration process is replaced with an automated electronic control system. The control device electronically compares measurement signals from both devices and automatically adjusts the measuring device through electronic control signals, replacing the manual mechanical adjustment process.
2Reliability
If manual calibration is performed, then the equipment complexity remains low, but reading errors and logging errors occur
Solution Approach 1:
The control device continuously monitors the comparison between the measuring device and reference measuring device, and automatically adjusts the measuring device based on detected deviations. This closed-loop feedback system eliminates reading and logging errors by removing human intervention from the calibration process.
Solution Approach 2:
The reference measuring device serves as a known accurate copy or standard against which the measuring device is compared. By copying the measurement process under controlled conditions and comparing results, the system ensures reliable calibration without manual intervention.
3Measurement precision
If manual adjustment is used, then the setup is simple, but local deviations and non-linearities caused by machine tolerances are not recognized
Solution Approach 1:
The calibration process is divided into multiple discrete test points across the measurement range. The control device systematically varies test conditions and compares measurements at each point, enabling detection of local deviations and non-linearities that would be missed in manual calibration.
Solution Approach 2:
The calibration system dynamically adjusts test conditions and automatically modifies the measuring device settings based on real-time comparison results. This dynamic approach allows the system to adapt to local deviations and non-linearities throughout the measurement range, unlike static manual methods.
4Productivity
If automated calibration is implemented, then calibration speed increases, but the device complexity increases
Solution Approach 1:
The control device performs multiple functions: it generates test signals, acquires measurements from both devices, compares results, and automatically adjusts the measuring device. This multi-functional approach consolidates what would otherwise require separate systems into a single integrated unit, increasing speed while limiting complexity growth.
Data Source
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AI summary
The invention relates to a device for calibrating and adjusting a measurement system in a tablet press, in particular a rotary tablet press, said device comprising at least one reference measurement system and at least one control system. Interfaces of the control system are connected to interfaces of the measurement system and the reference measurement system and the control system is designed to generate a plurality of reference measurement events and to record the associated measured values of the measurement system and the reference measurement system. The control system also comprises a comparison system which is used to compare the recorded measured values of the measurement system and the reference measurement system against each other and is designed to adjust the measurement system if there is an inadmissible deviation between the compared measured values. The invention also relates to a corresponding method.