Analytical Sampling Needle Calibration Using Robotic Arm Break-Off Detection
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Solution Overview
Problem
Conventional methods for calibrating the position of a robotic arm in analytical devices, such as HPLC systems, are complex and costly due to the need for additional displacement measuring systems, which increases operational complexity and costs.
Innovation Solution
A sampling device for analytical devices, comprising a robotic arm with a fixed needle, a driving device, a movable element, and a holding element, uses a bistable holding mechanism to determine the break-off region where the driving force overcomes the holding force, allowing precise calibration without additional encoders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional displacement measuring systems (encoders) are used to detect robotic arm movement, then measurement precision is improved, but device complexity and costs increase
Solution Approach 1:
The patent extracts the calibration function from the complex encoder system and implements it through a simple break-off detection mechanism. The holding element is removed from the movable element, allowing it to be disengaged at a predetermined position, thereby eliminating the need for additional encoders while maintaining calibration accuracy.
Solution Approach 2:
The system uses the robotic arm's own driving force and the break-off event to perform calibration. The control device monitors the driving force and detects the break-off point, which automatically indicates the needle's position without requiring external sensors or complex measurement systems.
2Measurement precision
If additional encoders and sensors are added for calibration, then measurement precision is improved, but manufacturing costs increase
Solution Approach 1:
The patent replaces expensive encoders and sensors with a simple break-off detection system. The holding element is a basic mechanical component that can be easily manufactured and replaced, significantly reducing manufacturing costs while achieving the same calibration function.
3Stability of the object's composition
If a holding element is permanently fixed to the movable element, then stability is improved, but measurement precision deteriorates due to inability to detect break-off point
Solution Approach 1:
The patent introduces dynamic behavior to the holding element by making it disengageable at a predetermined position. The holding element transitions from a static fixed state to a dynamic state where it can be overcome by the driving force, enabling break-off detection while maintaining stability during normal operation.
Data Source
AI summary
A sampling device for an analytical device includes an object handling device, in particular a robotic arm, configured for handling an object such as an analytical sample. A needle is fixedly coupled to the object handling device. A driving device, coupled to the object handling device, is configured for providing a driving force to the object handling device to drive the object handling device, such as in the vertical direction. A movable element is movably coupled to the object handling device, such that the movable element is at least partially movable with respect to the fixedly coupled needle. A holding element is configured for providing a holding force to the movable element, such that the holding force holds the movable element against the driving force. A control device is configured to increase the driving force until the driving force overcomes the holding force at a break-off region.