Overhead Hoist Crane Guide Wheel Dynamics for Rail Misalignment
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Solution Overview
Problem
The increasing semiconductor production in factories leads to insufficient storage capacity, causing a shortage that negatively impacts productivity due to the need for expanded storage facilities, which in turn reduces space for production equipment. Additionally, overhead hoist transport systems face issues with rail deformation and misalignment, resulting in abnormal crane behavior and reduced stopping precision.
Innovation Solution
An overhead hoist transport system is designed with a driving rail and a pair of support rails, where a crane is movably connected to both, featuring a driving wheel and guide wheels that maintain contact with the rails using elastic force, allowing it to operate smoothly even when the rails are deformed or misaligned, ensuring stability and precision during transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rail is deformed or misaligned due to installation and processing errors, then the crane experiences abnormal motion and reduced stopping precision, but the system continues to operate with degraded performance
Solution Approach 1:
The guide wheel assembly is designed to be movable relative to the driving rail, allowing it to dynamically adjust its position to accommodate rail deformation. The guide wheel can shift laterally along the driving rail to track the actual rail position, converting a static rigid connection into a dynamic adaptive system that maintains reliable operation despite manufacturing precision issues in the rail
Solution Approach 2:
The guide wheel acts as an intermediary element between the crane and the driving rail. Instead of the crane body directly engaging with the potentially deformed rail, the guide wheel serves as a mediator that absorbs and compensates for rail irregularities, allowing the crane to operate reliably even when the rail straightness is compromised
2Length of stationary object
If multiple rail parts are connected to extend the rail length, then the storage capacity and transport range increase, but steps and misalignments are introduced at connection points
Solution Approach 1:
The guide wheel assembly provides dynamic compensation at rail connection points. When multiple rail parts are connected, any misalignment or steps at the joints are automatically compensated by the guide wheel's ability to move laterally along the driving rail, allowing the system to maintain precision operation even with extended rail lengths composed of multiple segments
Solution Approach 2:
The guide wheel assembly performs self-alignment along the driving rail. As the crane moves along the rail with connection points, the guide wheel automatically adjusts its position to follow the actual rail geometry, including any steps or misalignments at connection points, without requiring external intervention or complex adjustment mechanisms
3Device complexity
If the crane uses a fixed rigid connection to the rail, then the structure is simple, but the crane cannot compensate for rail deformation and experiences abnormal motion
Solution Approach 1:
The guide wheel assembly introduces a controlled degree of freedom into the crane-rail connection. The guide wheel can move laterally along the driving rail within a predetermined range, transforming a completely rigid fixed connection into a semi-rigid dynamic connection that maintains structural simplicity while enabling compensation for rail deformation to ensure driving straightness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents abnormal crane behavior and enhances driving straightness and stopping accuracy, maintaining stability and precision during the loading and unloading of goods, thus addressing the storage capacity and rail deformation issues.
Implementation Method 1
a pair of guide wheels configured to be pressed toward contact surfaces of the pair of support rails using an elastic force
Data Source
AI summary
An embodiment of the present disclosure provides an overhead hoist transport system including: a driving rail configured to extend in a first direction; a support rail positioned parallel to the driving rail; and a crane movably connected to the driving rail and the support rail and configured to move along the driving rail and the support rail, wherein the crane includes: a base configured to extend in a second direction perpendicular to the first direction to cross the driving rail and the support rail; a driving wheel connected to the base and configured to move along the driving rail; and a guide wheel connected to the base and pressed toward a contact surface of the support rail to remain in contact with the support rail, the contact surface being a surface in contact with the guide wheel.