Split-Chassis Mobile Drive Unit for Ergonomic Conveyor Height
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Solution Overview
Problem
Mobile drive units in warehouse environments face challenges in efficiently transporting payloads over uneven floors while maintaining structural integrity and reducing stress on components during deceleration and acceleration, particularly when elevating the payload to an ergonomic height.
Innovation Solution
The implementation of a split chassis with a four-bar linkage and brace system that allows the front and rear chassis portions to pivot, reducing stress and enabling the mobile drive unit to flex, thus maintaining structural integrity and reducing weight while maintaining ergonomic payload height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the payload unit is elevated to an ergonomic height, then worker safety and collaboration are enhanced, but stress on the payload unit structure during deceleration and acceleration increases
Solution Approach 1:
The mobile drive unit is divided into separate modules: a chassis assembly and a payload unit that can be vertically spaced apart. This segmentation allows the payload unit to be elevated independently to ergonomic height while the chassis remains on the floor, reducing the transmission of stress during acceleration and deceleration.
Solution Approach 2:
The payload unit is positioned in a different vertical dimension than the chassis, creating a two-level structure. This vertical separation allows the payload to be at ergonomic height for worker interaction while the base chassis handles movement forces, effectively resolving the conflict between height and stress resistance.
2Adaptability or versatility
If the mobile drive unit navigates uneven floors, then adaptability to environment is improved, but structural integrity may be compromised
Solution Approach 1:
The mobile drive unit employs dynamic suspension elements and compliant connections between the chassis and payload unit. These elements allow the structure to adapt to uneven floors through controlled movement and deformation, maintaining structural integrity while navigating floor irregularities.
3Stability of the object's composition
If the chassis is made rigid to maintain payload height, then positional stability is improved, but weight increases
Solution Approach 1:
By separating the chassis from the payload unit vertically, the system maintains payload height stability without requiring the entire chassis to be rigid and heavy. The payload unit can be supported by lighter, more flexible connections that still maintain positional stability.
Data Source
AI summary
A mobile drive unit includes a pivot between the front chassis unit and the rear chassis unit, which both support a support structure that pivotally supports a payload unit. A conveyor is supported by the chassis assembly and located at least at an ergonomic height.