Pendulum Queue Transfer for Continuous Inventory Cycling
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Solution Overview
Problem
Inventory systems face inefficiencies in space utilization, equipment, and manpower, leading to lower throughput, long response times, and high costs for expanding storage capacity.
Innovation Solution
A pendulum queue system with a transfer apparatus that includes a laterally movable frame and a vertically movable header, equipped with a suction cup extractor and claw assembly, facilitates fast pick-up and drop-off of items between inventory holders and mobile drive units, allowing simultaneous item transfer and holder cycling, reducing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inventory storage location is filled to capacity with items and equipment, then storage capacity is maximized, but the cost of adding additional space or moving items to secondary location becomes prohibitively expensive
Solution Approach 1:
The system implements dynamic resource allocation by enabling inventory holders to be cycled between queues and by allowing mobile drive units to dynamically reposition items. This dynamic approach allows the system to adapt to changing storage needs without physical expansion, resolving the contradiction between maximizing storage capacity and avoiding expensive expansion costs.
Solution Approach 2:
The system creates a multi-functional storage and transfer mechanism where inventory holders serve multiple purposes (storage, transfer, cycling) and mobile drive units perform multiple functions (transport, positioning, item handling). This universality allows the existing infrastructure to handle increased inventory volumes without requiring additional dedicated expansion infrastructure.
2Productivity
If traditional inventory systems are used, then system structure is simple, but throughput is lower and response times are longer
Solution Approach 1:
The system implements continuous operation by cycling inventory holders between queues and enabling simultaneous item transfers. The mobile drive units continuously move items between locations while inventory holders are repeatedly cycled, eliminating idle time and maintaining continuous productive action, thereby improving throughput and reducing response times.
Solution Approach 2:
The system performs preliminary actions by pre-positioning inventory holders and items in optimal locations before transfers are needed. The cycling mechanism prepares inventory holders in advance, and the system anticipates transfer requirements, reducing waiting time and improving overall response time.
3Productivity
If inventory holders are cycled between queues, then item transfer efficiency is improved, but system complexity increases
Solution Approach 1:
The system implements self-service through automated control where the cycling of inventory holders and positioning of mobile drive units is managed by an automated control system. This self-service capability handles the increased complexity of coordinated movements and transfers without requiring manual intervention, maintaining high transfer efficiency while managing system complexity through automation.
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
The system enhances inventory system throughput by minimizing inactive time and improving transfer times, enabling efficient use of resources and reducing costs associated with expanding storage capacity.
Implementation Method 1
a suction cup extractor and claw assembly, facilitates fast pick-up and drop-off of items
Data Source
AI summary
A pendulum queue system for inventory management can include a first queue with a first delivery portion and a first storage portion separated by a first operating space. A second queue can be positioned laterally from the first queue and can include a second delivery portion and a second storage portion separated by a second operating space. Each of the storage portions can include its own storage work cell through which inventory holders can be cyclable, and each delivery portions can include one or more carriers. A transfer apparatus can be configured to move back and forth between the queues and to move within the operating space of each queue to transfer an item between an inventory holder and a carrier within one of the queues during a time interval in which the other queue can undergo cycling of the inventory holders.