Refuse Bin Rib Downward Extension for Stacking Stability
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Solution Overview
Problem
Existing waste bins with reinforcing ribs for stability and stacking capacity face issues with mechanical resistance and stability when stacked, leading to damage and reduced stacking capacity, which increases storage space requirements and transportation costs, and poses safety risks due to instability.
Innovation Solution
A container design with downward extensions that are integral to the ribs, providing continuous material support and stability, featuring a curved section parallel to the bottom, and a configuration that distributes weight evenly, enhancing mechanical strength and reducing stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the walls of the tank are thinned to lighten weight and save material, then the weight and material consumption are reduced, but the mechanical resistance of the lower wall is reduced
Solution Approach 1:
The lower wall is segmented by adding reinforcing ribs that divide the continuous wall into smaller panels. These ribs create a structured framework that distributes loads across multiple points, allowing the wall panels between ribs to be thinner while maintaining overall structural strength.
Solution Approach 2:
The solution combines thin wall material with thicker reinforcing ribs to create a composite structure. The ribs act as structural reinforcement elements that compensate for the reduced thickness of the wall panels, achieving both weight reduction and maintained mechanical resistance through the combination of different material thicknesses.
2Productivity
If more bins are stacked on top of each other to reduce storage surface area, then the storage efficiency is improved, but the lower wall of the bin underneath the stack cracks and the reinforcing rib buckles
Solution Approach 1:
The reinforcing structure is segmented into multiple ribs positioned at strategic locations around the lower wall. This segmentation allows the load from stacked bins to be distributed across multiple reinforcement points rather than concentrating stress in a single location, preventing rib buckling and wall cracking under heavy stacking loads.
Solution Approach 2:
The wall thickness and rib dimensions are optimized locally based on the specific stress requirements of each position. The reinforcing ribs are positioned where maximum bending moments occur, and their cross-sections are sized to provide adequate local strength, while the wall panels between ribs can be thinner where stresses are lower.
3Loss of substance
If the reinforcing rib is made thinner to save material, then the material consumption is reduced, but the rib cannot maintain its function and the lower wall cracks at the angle between the lower wall and the rib
Solution Approach 1:
The rib-wall connection transitions from a sharp angular joint to a curved, rounded connection. This curvature eliminates stress concentration points that occur at sharp angles, allowing the rib to maintain structural integrity with reduced thickness. The curved transition distributes stresses more evenly along the rib-wall interface, preventing cracking.
Solution Approach 2:
The cross-sectional dimensions and shape of the reinforcing ribs are optimized to achieve the minimum thickness that still provides adequate structural performance. By carefully controlling rib thickness, width, and curvature radius, the design finds the optimal parameter combination that minimizes material usage while preventing connection failure.
4Reliability
If a larger surface area is used for storage to accommodate damaged bins, then the risk of damage is reduced, but the storage efficiency and transportation cost are negatively impacted
Solution Approach 1:
The reinforcing ribs are designed with sufficient thickness and strength to prevent failure before it occurs. By providing adequate structural reinforcement in advance, the design prevents the buckling and cracking that would lead to stack instability and bin damage, eliminating the need for oversized storage areas to accommodate damaged bins.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The bin (10) has a tank (11), side faces (12A-12C) forming a peripheral wall (17), a bottom wall (14), and a connection region (16) for connecting the side faces. Another connection region (22) connects the side faces and the bottom wall. A rib is provided in the bottom wall for resting the bin on the ground in a normal waiting position. The peripheral wall forms a downward extension (34) only to the right and in the vicinity of overlapping regions (32) of the connection regions, so as to be supported on the ground when the bin is in the normal waiting position.