Mobile Drive Units for Inventory Handling
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Solution Overview
Problem
Modern inventory systems face challenges in efficiently managing large numbers of diverse inventory requests, leading to inefficient resource utilization, long response times, and high costs associated with incremental changes in capacity or functionality, making it difficult to accommodate fluctuations in throughput.
Innovation Solution
The implementation of a multi-level inventory system utilizing mobile drive units to efficiently move inventory holders between different stations, allowing for strategic operator interactions and reducing the number of touches and time consumed in processing inventory items, while also enabling flexible operation across multiple floors and efficient order fulfillment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional inventory systems are used with fixed infrastructure, then system stability is maintained, but adaptability to throughput fluctuations deteriorates
Solution Approach 1:
The system employs mobile robots that can dynamically reposition inventory holders throughout the workspace, replacing fixed conveyor paths with flexible, movable transport units. This allows the system to adapt its physical configuration based on real-time throughput requirements without permanent infrastructure changes.
Solution Approach 2:
The system utilizes multiple vertical floors for inventory storage and processing, adding a vertical dimension to the workspace. Mobile robots transport inventory holders between floors, enabling the system to expand capacity upward rather than requiring horizontal expansion, thus accommodating throughput fluctuations more efficiently.
2Productivity
If more inventory holders and equipment are added to increase capacity, then throughput capability is improved, but system cost and complexity worsen
Solution Approach 1:
Mobile robots perform multiple functions including transporting inventory holders, repositioning them within the workspace, and navigating between different floors. This multi-functionality allows the system to achieve increased throughput capability without adding specialized equipment for each function, thereby controlling system complexity.
Solution Approach 2:
The system uses automated mobile robots that autonomously navigate and transport inventory holders without requiring manual intervention. This self-service capability increases throughput while avoiding the need for additional manual labor infrastructure, maintaining manageable system complexity.
3Ease of operation
If operators manually handle and sort inventory items, then flexibility in processing is improved, but processing time and number of touches worsen
Solution Approach 1:
The system pre-positions inventory holders on mobile robots at strategic locations within the workspace before they are needed for picking. This preliminary action allows operators to access inventory more quickly without manual searching or retrieval, reducing processing time while maintaining operational flexibility.
Solution Approach 2:
Mobile robots act as intermediaries between central inventory storage and operator workstations. They transport inventory holders to optimal locations, reducing the number of manual touches required by operators while preserving the flexibility of human decision-making in the picking process.
Data Source
AI summary
An inventory system can receive a receipt receptacle from a shipping vehicle. The receipt receptacle can be moved to a case shuttle without separating or sorting inventory items in the receipt receptacle. A mobile drive unit can move the case shuttle to a receiving station, where the receipt receptacle can be removed and where the inventory items can be stowed in a pickable inventory holder. A mobile drive unit can move the pickable inventory holder to an order-compiling station, where inventory items can be picked from the inventory holder into order receptacles. A mobile drive unit can move an order shuttle carrying order receptacles with completed orders to a shipping station, where the completed order receptacles can be transferred to a shipping vehicle.