Lifting Trolley Reticular Structure for Uniform Roller Loading
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Solution Overview
Problem
Existing column-type lifting devices with electro-mechanical or electro-hydraulic drives suffer from inefficient use of rollers or skids due to manufacturing tolerances and deformations under load, leading to oversizing and non-optimum component utilization.
Innovation Solution
A lifting device with a trolley design featuring a cantilever shape and a reticular connecting structure with elastic tie rods and struts, allowing for compensation of positional differences between trolley portions and optimized load distribution across all rollers, adaptable to varying loads without replacing the entire trolley.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hyperstatic structure with four rollers or skids is used to connect the trolley to the column, then the trolley can support the load, but due to manufacturing tolerances and deformations, only three rollers are effectively loaded while one is randomly loaded, leading to inefficient use of components
Solution Approach 1:
The patent transforms the static hyperstatic connection into a dynamic isostatic connection where the trolley can adjust its position relative to the column. The reticular structure with elastic tie rods and struts allows the trolley to adapt to column deformations and manufacturing tolerances, ensuring all four rollers remain effectively loaded under various load conditions, thereby improving component utilization efficiency while maintaining load support reliability
Solution Approach 2:
The patent changes the structural parameters of the trolley connection system by introducing a reticular framework with elastic elements. This allows the system to transition from a rigid hyperstatic connection to a flexible isostatic connection that can accommodate dimensional variations and deformations, enabling all four rollers to share the load effectively across different operating conditions
2Reliability
If the trolley is designed as a single part or hyperstatic structure, then it provides stable load support, but it cannot adapt to different maximum loads without replacing the entire trolley
Solution Approach 1:
The patent segments the trolley into modular components: a reticular connecting structure with elastic tie rods and struts that can be independently adjusted or replaced. This segmentation allows specific components to be modified to adapt to different load requirements without replacing the entire trolley, while the overall structure maintains stable load support through its isostatic design
Solution Approach 2:
The reticular structure with elastic elements provides dynamic adaptability, allowing the trolley configuration to be adjusted for different load conditions. The elastic tie rods and struts can be modified in quantity, arrangement, or mechanical properties to suit various maximum load requirements, enabling the system to adapt without complete replacement while maintaining operational stability
3Productivity
If four rollers or skids are used in the trolley, then better load distribution is possible, but due to the hyperstatic system and manufacturing tolerances, one roller is randomly loaded and the others are overloaded, requiring oversizing of components
Solution Approach 1:
The patent introduces dynamic adjustment capability through the reticular structure with elastic tie rods and struts. This allows the trolley to automatically adapt its position and load distribution in response to manufacturing tolerances and column deformations, ensuring all four rollers remain effectively engaged and uniformly loaded without requiring oversizing of components
Solution Approach 2:
The patent modifies the structural parameters by transitioning from a rigid hyperstatic connection to a flexible isostatic connection. This parameter change enables the system to compensate for manufacturing tolerances and maintain uniform load distribution across all four rollers, eliminating the need for component oversizing while improving load distribution efficiency
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
Enables efficient use of all rollers, adapts to different load conditions, reduces production and storage costs, and maintains stable lifting performance by compensating for column deformations.
Implementation Method 1
a reticular connecting structure (7) comprising a set of elastic tie rods and struts (8)
Data Source
Figure 1~2
AI summary
Described is a lifting device (1) comprising a base support (4) and a column (5) fixed on said base support (4), a trolley (3) sliding vertically on said column (5) designed to engage with a load (Ω) to be lifted and comprising a first lower portion (31), a second portion (32) and a reticular connecting structure (7).