Central Belt System Optical Shadowing Prevention
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Solution Overview
Problem
Existing central belt systems in order-picking systems face challenges in achieving nearly 100% control of chaotically arranged articles on a moving central belt, particularly in preventing optical shadowing and ensuring accurate data capture of information located on the underside of articles, which is obscured by the central belt.
Innovation Solution
A central belt system with variably adjustable cameras and lighting systems, an automatic control system, and image processing unit, where the camera and lighting configurations prevent optical shadowing by optimizing article spacing and using second cameras to capture underside information after the central belt, along with dynamic speed adjustments and ejector control to ensure clear data capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If articles are collected in a heap on the moving central belt, then all articles belonging to an order can be gathered, but optical shadowing occurs and prevents accurate image capture
Solution Approach 1:
The system dynamically adjusts the ejection timing of articles based on real-time position feedback. The control unit calculates optimal ejection moments to ensure articles are spaced at distances that prevent mutual shadowing while maintaining efficient collection, transforming a static heap-collection approach into a dynamic spacing-controlled process
Solution Approach 2:
The system changes the temporal parameter of article ejection by calculating and enforcing minimum time intervals between successive article ejections. This parameter adjustment ensures that articles arrive on the belt with sufficient spacing to eliminate optical shadowing, directly resolving the contradiction between quantity collection and measurement precision
2Productivity
If the central belt moves at high speed (approx. 1m/s), then productivity is improved, but the time available for image processing and quality control is reduced
Solution Approach 1:
The system performs image capture and quality control continuously during the articles' passage on the belt, without requiring stopping or slowing down. The camera system and lighting are synchronized with belt motion to capture images at optimal moments, maintaining continuous productivity while enabling thorough inspection
Solution Approach 2:
The system performs preliminary actions by pre-calculating optimal ejection timings and positioning articles in advance to ensure they pass through the camera field of view at the correct orientation and spacing, enabling image processing to occur seamlessly during high-speed conveyance
3Loss of information
If information is located on the underside of articles, then more data can be captured, but the central belt obscures the underside from camera view
Solution Approach 1:
The system transitions from a two-dimensional top-down camera view to a three-dimensional approach by positioning cameras at the end of the belt where articles are ejected. This spatial repositioning allows cameras to capture the underside of articles as they leave the belt, eliminating the obstruction problem while maintaining data capture completeness
4Measurement precision
If ejectors are activated to space articles apart, then optical shadowing is prevented, but device complexity increases
Solution Approach 1:
The system uses a feedback mechanism where the control unit continuously monitors article positions on the belt and dynamically adjusts subsequent ejection timings based on actual spacing measurements. This closed-loop control achieves precise spacing without requiring complex mechanical spacing devices, resolving the contradiction between measurement precision and device complexity
Data Source
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AI summary
In the case of a central belt system (1) with article shafts (2), ejectors (5), moving central belt (4) and central control unit (6), it is proposed to provide an automatic control system (7') which is connected to the control unit (6) for articles to be controlled on the moving central belt (4), with a connected image processing unit (8), and a camera system (9, 10) possibly in addition with an illumination system (11). The camera and illumination systems (9, 10) are set in such a way, and the articles to be controlled which are arranged chaotically on the central belt (4) are ejected by the ejectors (5) in such a way, that optical shadow formation at the article to be controlled on the central belt (4) is preferably just prevented.