Multi-Level Elevator Sequencing for Automated Storage
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Solution Overview
Problem
Automated storage/retrieval systems face inefficiencies due to long cycle times for elevators and sequencing constraints, which hinder the optimization of load handling and delivery in a desired order.
Innovation Solution
The implementation of a multi-level elevator system combined with a multi-level transfer device and sequencer, allowing for simultaneous transfer and sequencing of loads across multiple levels, optimizing the system's rate and compliance with sequencing constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-level elevator is used for load transfer, then the system structure is simple, but the cycle time is long and productivity is reduced
Solution Approach 1:
The patent transitions from a single-level elevator to a multi-level elevator system, adding vertical dimensionality to the load transfer mechanism. This allows simultaneous operation at multiple levels, reducing the elevator cycle time while maintaining structural coherence through standardized level modules.
Solution Approach 2:
The elevator system is segmented into multiple independent levels, each capable of simultaneous load transfer operations. This segmentation allows parallel processing of loads at different levels, significantly improving system productivity without proportionally increasing overall system complexity.
2Productivity
If loads are transferred without sequencing, then the transfer speed is fast, but the delivery order cannot be guaranteed
Solution Approach 1:
The sequencer performs preliminary sorting and positioning of loads before they enter the elevator system. By pre-organizing loads in the correct sequence at the input stage, the system maintains high transfer speeds while ensuring accurate delivery order is preserved throughout the multi-level transfer process.
Solution Approach 2:
The control system incorporates feedback mechanisms that track load positions and sequences across multiple levels. This real-time monitoring and control ensures that even with high-speed parallel transfers, the delivery order constraint is maintained through dynamic adjustment of transfer sequences.
3Quantity of substance
If multiple elevators are used to increase capacity, then the load handling capacity increases, but the system complexity and space requirements increase
Solution Approach 1:
Multiple elevator functions are merged into a single multi-level elevator structure. Instead of having separate elevators for each level or function, the patent integrates multiple transfer levels into one unified system, achieving high load capacity while reducing the number of independent components and simplifying system configuration.
Solution Approach 2:
The multi-level elevator is designed as a universal system where each level can handle multiple load types and destinations. This multi-functionality allows the system to achieve high capacity utilization with fewer components, as each level can adapt to different operational requirements rather than requiring dedicated elevators for each function.
4Productivity
If the elevator cycle time is reduced, then the productivity increases, but the sequencing accuracy may be compromised
Solution Approach 1:
The multi-level elevator enables continuous load transfer operations across multiple levels simultaneously, eliminating idle cycle time. The sequencer operates continuously to maintain load sequences, ensuring that even at high speeds, no sequencing accuracy is compromised due to intermittent stopping or repositioning.
Solution Approach 2:
By pre-sequencing loads before they enter the rapid transfer system, the patent ensures that the high-speed multi-level transfer operates on pre-organized batches. This preliminary action allows the system to maintain both high productivity and sequencing accuracy, as the rapid transfer simply moves pre-sorted loads without needing to perform complex sequencing during high-speed operation.
Data Source
AI summary
An automated storage/retrieval system is proposed. The system includes a control system, at least one storage unit having several levels at which loads can be picked or deposited and at least one interface conveyor for entries/exits of loads into and out of the system, and at least one elevator for a transfer of loads between the at least interface conveyor and the at least one storage unit. The at least one elevator is a multi-level elevator, and the automated storage/retrieval system furthermore includes at least one multi-level transfer device capable of simultaneously receiving, on several levels, a set of loads intended for or coming from at least one elevator; and at least one sequencer provided with elements of vertical moving and capable of transferring loads between the at least one multi-level transfer device and the at least one interface conveyor.