Multi-Level Robotic Workstation Traffic Management
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Solution Overview
Problem
Existing material handling systems in e-commerce and storage face inefficiencies in throughput due to interference between workstation traffic and storage/retrieval traffic, limiting peak performance.
Innovation Solution
A robotic system with a picking workstation that includes tote storage and retrieval, transit decks, and gantry-based robotic handlers, allowing bots to autonomously transport totes and queue for picking lanes with multiple levels to manage traffic flow and increase workstation density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-level workstation design is used, then the structure is simple, but traffic interference between workstation and storage/retrieval operations occurs, limiting throughput
Solution Approach 1:
The patent transitions from a single-level workstation to a multi-level (two-level) workstation structure. The first level handles incoming bot traffic from storage, while the second level handles outgoing bot traffic to transit decks. This vertical dimensionality change separates previously conflicting traffic flows, eliminating interference and enabling sustained high throughput of 400 eaches per hour per workstation.
2Productivity
If multiple workstations are placed along a deck, then productivity increases, but traffic congestion increases, reducing efficiency
Solution Approach 1:
The patent segments bot traffic into distinct lanes: incoming bots use dedicated streets to access workstation entry points, while outgoing bots use dedicated avenues to reach transit decks. This segmentation prevents traffic congestion by ensuring that incoming and outgoing bot flows do not interfere with each other, even when multiple workstations are densely packed along the deck.
Solution Approach 2:
The patent introduces intermediate queuing buffers at each workstation where bots wait for their turn to access the picking lane. These buffers act as mediators that smooth out traffic flow, preventing congestion from propagating through the system and allowing multiple workstations to operate simultaneously at high capacity.
3Loss of time
If bots queue directly at the picking lane, then response time is fast, but traffic interference with storage and retrieval operations occurs
Solution Approach 1:
The patent resolves the timing conflict by creating a two-level temporal structure: Level 1 handles storage and retrieval operations independently, while Level 2 handles picking operations with dedicated queuing buffers. This allows bots to queue for picking without blocking storage/retrieval traffic, maintaining both fast response times and high overall throughput of 400 eaches per hour per workstation.
Data Source
AI summary
An apparatus is disclosed including a robotic system having a robotic picking workstation, tote storage and retrieval and transit decks. The system has bots that autonomously transport totes from the storage and retrieval system to the robotic picking workstation via the transit decks. The robotic picking workstation may have a picking lane where a robotic handler transports eaches from totes on the bots to order totes in the workstation. The robotic picking workstation further has a queuing buffer where bots are cued for the picking lane.