Drive-Shaft Position Encoding for Blood Bag Swing Devices
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Solution Overview
Problem
Current swing devices for mixing blood with anticoagulant require cumbersome manual calibration and are prone to position estimation errors due to mechanical and electromagnetic disturbances, making them difficult to automate.
Innovation Solution
A swing device with a position encoding device that indirectly measures the tray's position using a rotatable shaft member's rotary position, allowing for automatic calibration and robust signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall sensor and magnet are used to directly observe tray position, then position measurement is possible, but manual calibration is cumbersome and position estimation is prone to errors due to mechanical and electromagnetic disturbances
Solution Approach 1:
The patent replaces the direct mechanical position observation system (Hall sensor and magnet on the swing) with an indirect measurement system using a position encoding device on the drive shaft. This substitution eliminates the need for manual calibration and reduces susceptibility to mechanical and electromagnetic disturbances during operation.
Solution Approach 2:
The patent introduces a position encoding device as an intermediary element that measures the rotary position of the drive shaft rather than directly measuring the tray position. This intermediary measurement approach provides more stable and accurate position information without being affected by disturbances in the blood bag mixing process.
2Reliability
If a Hall sensor and magnet are used to directly observe tray position, then position measurement is possible, but the system is prone to errors due to electromagnetic radiation during donation process
Solution Approach 1:
The position encoding device serves as an intermediary that measures drive shaft position indirectly, isolating the measurement system from electromagnetic radiation and mechanical disturbances occurring during the blood bag mixing process.
Solution Approach 2:
The patent extracts the position measurement function from the directly disturbed environment (tray and blood bag area) and relocates it to the drive shaft, where measurement conditions are more stable and less susceptible to electromagnetic interference and mechanical disturbances.
3Productivity
If direct position observation using Hall sensor is used, then position data is available, but significant effort and time is spent on adjustment and calibration during manufacturing
Solution Approach 1:
The patent replaces the calibration-dependent Hall sensor system with a position encoding device that provides inherent reference positions, eliminating the need for time-consuming manual calibration procedures during device manufacturing and setup.
Solution Approach 2:
The position encoding device is pre-configured with reference position markings on the drive shaft, allowing the system to automatically determine tray position without requiring preliminary manual calibration adjustments during manufacturing or setup.
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
Enables accurate, automated position determination of the tray with reduced components and manual effort, enhancing reliability and ease of use.
Implementation Method 1
the drive device comprises a position encoding device configured to encode a rotary position of the rotable shaft member of the drive device
Implementation Method 2
An electromotive drive device is operatively coupled to the tray for causing a rocking movement of the tray with respect to the stand
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A swing device (1) for moving a blood bag (2) comprises a stand (11), a tray (10) for receiving the blood bag (2), the tray (10) being pivotable with respect to the stand (11), an electromotive drive device (12) operatively coupled to the tray (10) for causing a rocking movement of the tray (10) with respect to the stand (11), and a control device (14) for controlling operation of the drive device (12). The drive device (12) comprises a rotatable shaft member (126) which is rotatable for driving said rocking movement of the tray (10). The drive device (12) further comprises a position encoding device (13) configured to encode a rotary position of the rotatable shaft member (126) of the drive device (12), wherein the control device (14) is configured to determine a position of the tray (10) with respect to the stand (11) based on an encoder value indicative of the rotary position of the rotatable shaft member (126).