Magnetoresistive Level Reader for Packaging Tube Overfill Control
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Solution Overview
Problem
Existing package producing machines face challenges in accurately controlling the liquid level in packaging tubes, leading to issues such as increased resistance, damage to packaging material, overfilling, and production stops, which result in costly waste and inefficiencies.
Innovation Solution
A level reader system with a magnetic float and a plurality of magnetoresistive sensors distributed along a housing, capable of providing precise liquid level readings, is integrated into the package producing machine to enhance accuracy and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensor is used to detect liquid level, then the device complexity is reduced, but the measurement precision and reliability are insufficient leading to inaccurate level control
Solution Approach 1:
The liquid level detection system is segmented into multiple independent sensors distributed along the tube axis. Each sensor detects liquid level at its specific position, and the processing unit integrates these segmented measurements to determine the overall liquid level. This segmentation enables more precise level detection across different zones of the tube while maintaining individual sensor simplicity.
Solution Approach 2:
Multiple sensor readings are merged and processed by a processing unit to determine the liquid level. The system combines information from several sensors distributed along the tube, integrating their individual measurements into a comprehensive level assessment. This merging approach enhances measurement precision by cross-validating multiple data points while distributing the complexity across multiple simple sensor units.
2Quantity of substance
If the tube is filled with too much liquid content, then the liquid level rises, but the resistance against clamping action increases causing damage to packaging material
Solution Approach 1:
The system performs preliminary detection of liquid level before the sealing and forming operations begin. By monitoring the liquid level in advance using distributed sensors, the system can identify when the tube is overfilled prior to the clamping action. This preliminary detection allows for preventive control, preventing excessive liquid content that would cause increased resistance and damage during subsequent sealing operations.
Solution Approach 2:
The level reader system provides continuous feedback on liquid level to the control system. When the liquid level approaches dangerous thresholds, the feedback mechanism allows for real-time adjustment or shutdown, preventing overfilling before it causes harm. This feedback loop enables the system to respond dynamically to liquid level changes and prevent conditions that would lead to packaging material damage during clamping.
3Quantity of substance
If the amount of liquid in the tube exceeds a certain level, then overfilling occurs, but this creates leakage leading to production stops and component damage
Solution Approach 1:
The system performs preliminary detection of liquid level before overfilling occurs. By continuously monitoring liquid level with distributed sensors, the system can detect when the tube approaches its maximum capacity and take preventive action. This preliminary detection prevents overfilling conditions that would lead to leakage, production stops, and component damage, thereby maintaining production reliability.
Solution Approach 2:
The level reader system provides real-time feedback on liquid level to prevent overfilling. The continuous monitoring and feedback mechanism allows the control system to adjust liquid flow or initiate shutdown procedures before the tube becomes overfilled. This feedback loop prevents leakage and associated production interruptions, maintaining reliable continuous operation.
4Measurement precision
If a magnetic float with strong magnetic field is used, then the sensor detection is improved, but the compatibility with various magnetic devices is reduced
Solution Approach 1:
Instead of using a single strong magnetic field source, the system employs multiple sensors distributed along the tube, each detecting the magnetic field locally at its position. The magnetic float generates a distributed magnetic field pattern rather than a single concentrated field. This local quality approach allows different sensor types and magnetic device configurations to be compatible, as each sensor responds to the local magnetic field strength rather than requiring a uniformly strong field throughout.
Solution Approach 2:
The system accommodates different magnetic device strengths by changing the detection parameters of the sensors. Sensors are calibrated to detect varying magnetic field strengths corresponding to different float positions. This parameter adjustment allows the system to work with magnetic floats of varying strengths and be compatible with different magnetic device types, enhancing versatility while maintaining measurement precision through adaptive sensor response characteristics.
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
The system provides extremely accurate liquid level signals, minimizing the risk of overfilling and production stops, and simplifies installation and compatibility with various magnetic devices, while reducing false readings.
Implementation Method 1
The magnetic float comprises a cylinder and a ring-shaped holder arranged in the cylinder, and wherein the ring-shaped holder comprises a plurality of magnets being distributed around said holder
Implementation Method 2
a plurality of sensors being distributed in the housing along the longitudinal direction... each of the plurality of sensors is a magnetoresistive sensor
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
A level reader device (60) for a package producing machine is disclosed herein. The level reader device (60) comprises a housing (62) extending in a longitudinal direction being substantially parallel to a filling direction (44) of a tube of packaging material (24), and a plurality of sensors (64) being distributed in the housing (62) along the longitudinal direction and configured to provide one or more sensor readings (65). The level reader device (60) further comprises a processing unit (66) being configured to determine a level (80) of liquid in the tube of packaging material (24) based on the one or more sensor readings (65).