Multi-Level Reciprocating Elevator Buffer Storage for Load Sequencing
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Solution Overview
Problem
Conventional buffer storage and load sequencing systems for logistics systems, such as automated storage/retrieval warehouses, have high consumption of space, difficulty in maintenance access, and limited capacity for accumulating loads due to dense conveyor layouts, which increases the size and complexity of the system.
Innovation Solution
A buffer storage and load sequencing system utilizing a multi-level reciprocating elevator with a single nacelle and buffer storage units, controlled by a central unit to organize load movements, minimizing sequencing constraints and optimizing load handling through a combination of elevators and conveyors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dense conveyor layouts are used for buffer storage and load sequencing, then load handling capacity is provided, but system size and complexity increase significantly
Solution Approach 1:
The patent transitions from horizontal conveyor-based buffer storage to vertical elevator-based buffer storage. The elevator shaft utilizes the vertical dimension to provide buffer capacity, thereby reducing the horizontal footprint and overall system complexity while maintaining load handling capacity.
Solution Approach 2:
The patent nests the buffer storage function within the elevator structure itself. The elevator car and shaft serve dual purposes: transporting loads and providing buffer storage capacity, eliminating the need for separate horizontal conveyor buffer zones and reducing system complexity.
2Quantity of substance
If conventional conveyor-based buffer storage is implemented, then loads can be accumulated, but maintenance access becomes difficult
Solution Approach 1:
By moving from horizontal conveyor layouts to vertical elevator-based storage, the patent creates open access points at multiple levels. Maintenance personnel can access the elevator shaft and components from the sides and top, whereas horizontal conveyors require access underneath and between densely packed components.
3Device complexity
If sequencing is performed far from preparation stations, then system organization is simplified, but responsiveness and efficiency decrease
Solution Approach 1:
The patent introduces the elevator as an intermediary device between the conveyor system and preparation stations. The elevator provides both buffer storage and sequencing functions in one compact location close to the preparation station, eliminating the need for extensive horizontal conveyor sequencing zones.
Data Source
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AI summary
A system for buffer storage and sequencing of loads is configured to receive non-sequenced loads originating from at least one external unit (UE) and to supply sequenced loads to at least one preparation station (PP). The system comprises: a reciprocating lift (EA) comprising a single platform comprising K levels, each of which can be used to transport at least one load, with K ≥ 2; at least one buffer storage unit (UST1, UST2); and a control unit (UP) configured to organise first movements of loads from at least one incoming forward conveyor (CAE) to the at least one buffer storage unit, via the reciprocating lift, and second movements of loads from the at least one buffer storage unit to at least one outgoing forward conveyor (CAS), via the reciprocating lift.