Multi-Wheel Slippage Detection for Conveyance Vehicle Stopping
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Solution Overview
Problem
Conventional conveyance devices experience reduced efficiency due to slippage at the wheels of traveling vehicles, particularly when control is implemented to stop the vehicle upon wheel slippage.
Innovation Solution
A conveyance device equipped with a traveling vehicle, masts, a raising and lowering section, and a control system that includes slippage detection sections to detect and stop the vehicle if multiple wheels experience significant slippage, allowing continued operation with remaining wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control is implemented to stop the traveling vehicle when slippage occurs at a wheel, then wheel slippage is detected and addressed, but efficiency with which the traveling vehicle conveys a conveyance object is reduced
Solution Approach 1:
The traveling vehicle is divided into multiple independent driving units, each with its own wheel and slippage detection section. This segmentation allows the system to detect and respond to slippage at individual wheels without stopping the entire vehicle, as each driving unit can operate independently when slippage is detected at a specific wheel.
Solution Approach 2:
Different wheels are equipped with independent slippage detection sections that monitor local conditions at each wheel. The control section responds differently based on which specific wheel experiences slippage, allowing continued operation of wheels without slippage while addressing only the affected local area.
2Reliability
If the traveling vehicle stops when slippage is detected at any wheel, then slippage is addressed, but unnecessary stops reduce conveyance efficiency
Solution Approach 1:
The system segments slippage detection by wheel, with each wheel having its own detection section. The control section uses this segmented information to determine whether to stop the vehicle, allowing continued operation when slippage occurs at only one wheel while stopping only when multiple wheels are affected.
Solution Approach 2:
The control section applies partial action by stopping the vehicle only when necessary (when two or more wheels detect slippage) rather than stopping for every single wheel slippage event. This selective stopping approach addresses excessive slippage situations while allowing partial operation when single-wheel slippage occurs.
Data Source
AI summary
A conveyance device includes a traveling vehicle, a mast, a raising and lowering section, and a control section. The traveling vehicle includes a wheel, a motor which drives the wheel, and a slippage detection section which detects slippage at the wheel. In a case where two or more slippage detection sections out of the slippage detection sections detect, at least in a state where the traveling vehicle is accelerated, slippage of not less than a predetermined amount, the control section causes the traveling vehicle to stop.