Deployable Support Arm for Earthquake-Stable Transport Vehicles
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Solution Overview
Problem
Transport vehicles in facilities without guiding rails for the upper part are prone to overturn during earthquakes due to their large dimensions in the up-down direction, posing a stability risk.
Innovation Solution
A transport vehicle equipped with a moving body, a transfer device, and an overturning prevention device that includes a support arm which projects outwardly from the vehicle when shaking is detected to prevent overturning, using a shaking occurrence information acquisition section to trigger the arm's projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transport vehicle has a large height dimension relative to width dimension, then the transfer device can access higher storage positions, but the vehicle becomes more prone to overturning during earthquake shaking
Solution Approach 1:
The support arm is designed to dynamically change its position between a retracted state during normal operation and a projecting state during earthquake shaking. This dynamic adjustment allows the vehicle to adapt its stability characteristics based on operational conditions, enabling the use of a taller mast while maintaining overturning resistance when needed.
Solution Approach 2:
The support arm is positioned in advance to project outwardly before or during earthquake shaking occurs. This preliminary positioning creates a stabilizing effect that counteracts the overturning moment generated by the tall mast, preventing the vehicle from overturning before the shaking fully impacts the structure.
2Stability of the object's composition
If the support arm projects outwardly during normal operation, then the vehicle is stable, but the support arm may interfere with articles on the travel face
Solution Approach 1:
The support arm transitions from a retracted position during normal operation to a projecting position during earthquake shaking. This dynamic repositioning ensures that the support arm only occupies the space needed for stabilization when actually required, eliminating interference with articles during normal transport and storage operations.
Solution Approach 2:
The support arm is retracted to a position inside the width dimension of the moving body during normal operation, preparing the vehicle for stable operation without interference. When earthquake shaking is detected, the arm is quickly deployed to the projecting state to provide stabilization, demonstrating preliminary preparation for different operational states.
Data Source
AI summary
An overturning prevention device includes a shaking occurrence information acquisition section configured to acquire shaking occurrence information indicating that shaking of a travel face where a moving body travels is equal to or more than a predetermined reference value; a support arm supported by the moving body; and an arm driving device configured to drive the support arm. The support arm is configured to be changeable between a projecting state where the support arm projects outwardly in a vehicle-body width direction from the moving body to be grounded on a travel face outside the moving body in the vehicle-body width direction and a retracted state where the support arm is retracted inside a width dimension of the moving body.