Overhead Transport Hoist Control for Lifting Part Inclination
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Solution Overview
Problem
Existing overhead transport vehicles face challenges in adjusting the inclination of the lifting part due to errors in suspending member thickness and winding drum diameter, necessitating a solution to automatically adjust the inclination without manual operation.
Innovation Solution
The overhead transport vehicle incorporates a lifting part suspended by suspending members, a winding drum, guide rollers, a body part, and a control system that adjusts the inclination of the lifting part based on information about its inclination, using a position adjusting part and a storage unit to store and control the movement of guide rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the suspending members are wound on the winding drum with fixed parameters, then the structure is simple, but the inclination of the lifting part cannot be adjusted automatically due to errors in suspending member thickness and winding drum diameter
Solution Approach 1:
The patent makes the guide roller position adjustable rather than fixed. The position adjusting part enables the guide roller to move in the lifting direction, dynamically adapting the suspending member path to compensate for manufacturing errors and achieve automatic inclination adjustment of the lifting part.
Solution Approach 2:
The control part automatically controls the position adjusting part based on inclination information, enabling the system to self-adjust the lifting part inclination without manual intervention. The system uses feedback from inclination sensors to automatically position the guide roller and correct any inclination deviations.
2Productivity
If manual adjustment of guide roller position is used, then the device complexity is low, but the operational efficiency decreases due to required manual intervention
Solution Approach 1:
The patent incorporates inclination information acquisition (through sensors detecting the lifting part's inclination state) and feeds this information back to the control part. The control part then automatically adjusts the guide roller position via the position adjusting part, creating a closed-loop feedback system that eliminates manual adjustment and improves operational efficiency.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated control system. The control part uses electrical/control signals to operate the position adjusting part, substituting human mechanical intervention with an automated electromechanical system that continuously maintains optimal lifting part inclination.
3Manufacturing precision
If the guide roller position is fixed relative to the body part, then the manufacturing precision requirements are lower, but the lifting part cannot be positioned at desired inclination angles
Solution Approach 1:
The patent transforms the fixed guide roller position into a dynamically adjustable position. The position adjusting part enables continuous or discrete adjustment of the guide roller's position in the lifting direction, allowing precise control of the lifting part inclination angle while compensating for manufacturing tolerances in other components.
Data Source
AI summary
The overhead transport vehicle includes: a winding drum configured to lift and lower a lifting part by winding and paying out a plurality of suspending members; at least one guide roller around which the suspending members paid out from the winding drum are wound; a body part supporting the winding drum and the guide roller; at least one position adjusting part configured to move a portion of each suspending member connected to the lifting part in a lifting direction by moving a relative position of the guide roller with respect to the body part; and a control part configured to control movement of the guide roller by the position adjusting part, based on information on an inclination of the lifting part.