Conveyor Reject Control With Dynamic Position Correction
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Solution Overview
Problem
Food processing facilities face challenges in preventing cross-contamination of allergens, particularly dairy and wheat, which can lead to health issues even with trace amounts, necessitating costly recalls and separate manufacturing lines.
Innovation Solution
A fail-to-safe system that includes sensors and a controller to monitor and classify products on a conveyor line, using redundant inputs and outputs to ensure accurate identification and rejection of allergenic items, preventing them from mixing with non-allergenic products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate manufacturing lines are constructed to avoid cross-contamination, then allergen contamination risk is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The system segments the manufacturing line into distinct allergen-free zones and contaminated zones using physical barriers and air flow controls. Sensors are placed at segment boundaries to detect and prevent cross-contamination, allowing a single manufacturing line to function as multiple isolated production environments.
Solution Approach 2:
Air locks and air curtains serve as intermediary elements between clean and contaminated zones. These intermediaries create pressure differentials and air flow barriers that prevent allergen migration while maintaining continuous production flow, eliminating the need for completely separate manufacturing lines.
2Reliability
If continuous monitoring and rejection of allergenic products is implemented, then allergen contamination is prevented, but productivity decreases due to removal of containers
Solution Approach 1:
The system performs preliminary identification and segregation of allergenic products at the point of detection. By immediately diverting contaminated containers to a separate rejection path, the system prevents further processing of problematic items while maintaining uninterrupted flow of safe products through the main production line.
Solution Approach 2:
The rejection mechanism extracts only the contaminated containers from the production stream, leaving the majority of safe products to continue through normal processing. This selective removal minimizes productivity impact by affecting only the small fraction of containers that actually contain allergens.
3Measurement precision
If dynamic correction amount calculation is used for reject position, then rejection accuracy is improved, but control system complexity increases
Solution Approach 1:
The system uses feedback from container position sensors and production line velocity measurements to dynamically calculate the optimal reject position. The correction amount is continuously adjusted based on real-time data about container location and line speed, ensuring accurate rejection despite variations in production conditions.
Solution Approach 2:
The control system transitions from static, pre-programmed rejection positions to dynamic, real-time calculation of reject locations. The correction amount is continuously updated based on current production line velocity and container position, allowing the system to adapt to changing conditions while maintaining simple mechanical rejection mechanisms.
Data Source
AI summary
A system, including: a sensor that monitors containers as the containers move along a production line; a rejection device; a controller communicatively connected to the sensor and the rejection device, wherein the controller is programmed to determine whether a container is associated with a match condition in response to a signal received from the sensor, the match condition reflecting that the container is associated with predetermined properties or characteristics, in response to a match condition, determine a pass result, and otherwise determine a fail result, determine a velocity of the production line, dynamically determine a correction amount for a reject position, track a position of the container on the production line, and in response to the fail result, outputs a signal to actuate the rejection device that removes the container from the production line based on the velocity of the production line, the dynamically determined correction amount, and the position of the container on the production line.