Lawn Aerator Perforator with Turned-Over Edge for Strength
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Solution Overview
Problem
Traditional lawn aerators with long perforating portions face issues of deformation and breakage due to excessive stress, leading to reduced soil aerating effectiveness and increased assembly complexity.
Innovation Solution
The design features a disk-shaped main portion with integrally formed perforating portions that extend radially outward, where the edge between adjacent perforating portions is turned over to form a turned-over portion, dispersing stress and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the perforating portion is made longer to aerate extremely hard soil, then the soil aerating capability is improved, but the stress at the connecting portion becomes too large causing deformation and breakage
Solution Approach 1:
The edge of the perforator is turned over to form a turned-over portion, transforming the flat two-dimensional structure into a three-dimensional structure with enhanced axial strength. This dimensional change allows the connecting portion to better withstand the stress generated during aeration of extremely hard soil without breaking.
2Reliability
If several independent perforating portions are mounted on the lawn aerator to replace damaged parts, then the reliability is improved, but the assembly difficulty increases
Solution Approach 1:
Multiple perforating portions are integrally formed with the main portion of the perforator as a single unified structure. This merging eliminates the need for separate assembly of multiple independent perforating portions, significantly reducing assembly difficulty while maintaining the reliability benefit of having multiple perforating portions.
Solution Approach 2:
The perforating portions are designed as distinct radial extensions from the main portion, allowing individual replacement if needed while maintaining integral formation. This segmentation approach enables flexibility in maintenance while preserving the simplicity of integral manufacturing.
3Strength
If the edge is turned over to form a turned-over portion, then the axial strength and bending strength are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The edge turning-over process modifies the geometric parameters of the perforator by changing the flat edge into a curved, three-dimensional structure. This parameter change enhances the axial and bending strength of the connecting portion while being achievable through standard metal forming processes, balancing strength improvement with manufacturing feasibility.
Data Source
AI summary
Disclosed are a perforator and a lawn aerator. The perforator includes a main portion and a plurality of perforating portions. The main portion is in a disk shape, and the perforating portions are integrally formed with the main portion. The perforating portions extend radially outward from an outer periphery of the main portion, and are arranged at intervals in a circumferential direction of the main portion. Each perforating portion forms a cutting portion at a distal end thereof. Between cutting portions of any two adjacent perforating portions, an edge of the perforator is turned over towards one side of the perforator to form a turned-over portion. According to this configuration, a greater bending strength can be obtained. In addition, the connecting portion of the perforating portion and the main portion can be strengthened. Therefore, the manufacturing processes are reduced, and so the manufacturing cost and manufacturing difficulty.