Ceiling Transport Vehicle Vibration Isolation for Variable Loads
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Solution Overview
Problem
Conventional overhead transport vehicles fail to effectively reduce vibration transmission to articles of varying weights, as the vibration isolator's repelling function is inadequate for lighter articles and may not function properly when the article is empty.
Innovation Solution
The overhead transport vehicle incorporates a dual-biasing vibration isolator system with a first biasing portion for lighter articles and a second biasing portion activated by heavier loads, along with a viscoelastic material for swaying attenuation, and a link mechanism to adjust distances and reduce rolling motion, ensuring effective vibration reduction across different load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration isolator is adjusted to ensure the spring member functions when the article weight is maximum, then vibration transmission is reduced for heavy articles, but the repelling function fails for light articles and empty containers
Solution Approach 1:
The vibration isolator is segmented into two distinct spring members: a first spring member for light loads and a second spring member for heavy loads. Each spring member has different stiffness characteristics optimized for specific weight ranges, allowing the system to adapt to varying article weights effectively
Solution Approach 2:
The vibration isolator dynamically switches between the first and second spring members based on the applied load. When the article weight exceeds a predetermined threshold, the system transitions from using only the first spring member to using both spring members in parallel, providing adaptive vibration isolation
2Device complexity
If a single spring member is used in the vibration isolator, then the structure is simple, but it cannot effectively reduce vibration for both light and heavy articles
Solution Approach 1:
The system changes the stiffness parameter of the vibration isolator by switching between different spring members. The first spring member has lower stiffness for light articles, while the second spring member has higher stiffness for heavy articles, optimizing vibration reduction across different load conditions
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 ensures reduced vibration transmission and swaying for both light and heavy articles, maintaining effective vibration isolation regardless of load variations and preventing swaying and rolling motions during transport.
Implementation Method 1
a first biasing portion disposed in contact with both of the support and the base to urge the support and the base in a direction away from each other
Implementation Method 2
a second biasing portion disposed at one of the support and the base to come into contact with both of the support and the base and urge the support and the base in a direction away from each other when a load equal to or greater than a predetermined value is applied to the first biasing portion
Implementation Method 3
the second biasing portion may include a viscoelastic material or portion
Data Source
AI summary
An overhead transport vehicle includes an elevator including a base and a first support supporting the base to be vertically movable from below in a vertical direction through a vibration isolator. The vibration isolator includes a first biasing portion in contact with both of the support and the base to urge a first body and the base in a direction away from each other, and a second biasing portion at one of the first body and the base to come into contact with both of the first body and the base and urge the first body and the base in a direction away from each other when a load equal to or greater than a predetermined value is applied to the first biasing portion.