Flow Rack Occupancy Sensing for Flexible Inventory Detection
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Solution Overview
Problem
Existing flow rack units require laborious adaptation of sensor systems when rack configurations change, making it difficult and costly to detect inventory and manage stock material units efficiently.
Innovation Solution
A flow rack unit with a control system featuring a common data line connecting occupancy sensors to a control unit, where each sensor measures distance from the storage side to the rearmost stock material unit, allowing for simple and cost-effective inventory detection and adaptation to configuration changes without the need for multiple sensors per stock material unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is associated with every stock material unit position in the rack bay, then inventory detection precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The rack bay is divided into multiple rack levels, and each rack level is segmented into individual measurement zones. Instead of placing sensors at every possible stock material unit position, the system uses one occupancy sensor per rack level that scans across multiple measurement zones. This segmentation approach maintains detection precision by covering all positions while reducing sensor quantity by factor of the number of positions per level.
Solution Approach 2:
A single occupancy sensor per rack level performs multiple functions: it detects occupancy status across all measurement zones of that rack level, determines the number of stock material units, and identifies their positions. This multi-functional sensor replaces what would traditionally require multiple individual sensors, one for each detection task or position.
2Measurement precision
If the sensor system is adapted to changed rack configurations, then measurement precision is maintained, but labor and time requirements increase
Solution Approach 1:
The control system dynamically adapts to rack configuration changes through software updates rather than physical sensor reconfiguration. When rack divisions or stock material unit sizes change, the control system recalculates measurement zone boundaries and occupancy evaluation criteria based on new parameters, maintaining measurement precision without requiring sensor relocation or reinstallation.
Solution Approach 2:
The system maintains measurement precision under configuration changes by adjusting software parameters such as measurement zone dimensions, occupancy thresholds, and stock material unit size definitions. These parameter changes allow the same physical sensor system to accurately detect inventory in different rack configurations without hardware modification.
3Reliability
If multiple sensors are used per rack bay, then inventory detection reliability is improved, but ease of manufacture and installation deteriorates
Solution Approach 1:
The rack bay is segmented into multiple rack levels, with each level monitored by a dedicated occupancy sensor. This segmentation distributes the detection function across multiple simple sensors rather than using fewer complex sensors, improving reliability through redundancy while maintaining ease of installation since each sensor is independently mounted at a rack level.
Solution Approach 2:
The control system continuously receives occupancy status feedback from sensors at each rack level and cross-validates readings across multiple measurement zones. This feedback mechanism enhances detection reliability by identifying and correcting potential sensor errors through comparison with adjacent zones, while the system remains simple to manufacture and install.
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 efficient detection of stock material units with fewer sensors, allowing for easy adaptation to changing configurations and improved inventory management, reducing labor and costs associated with sensor system adjustments.
Implementation Method 1
Each occupancy sensor has a measurement zone that is aligned from the storage side of the associated rack bay in the direction of the removal side of the associated rack bay to measure a distance from a rearmost stock material unit stored in the associated rack bay
Data Source
AI summary
A flow rack unit for providing stock material units includes at least two rack bays and one control system. Each rack bay has a removal side and a storage side opposite the removal side and is configured to provide the stock material units in a respective bay level arranged next to one another starting in the direction of the storage side. A respective sensor arrangement of the control system is associated with each rack bay. Each sensor arrangement is arranged at the storage side of the associated rack bay and connected to a control unit of the control system via a common data line. The sensor arrangements each include an occupancy sensor configured as a distance sensor. Each occupancy sensor has a measurement zone that is aligned to measure a distance from a rearmost stock material unit stored in the associated rack bay and disposed closest to the occupancy sensor.