Ejection Paddle Wear Region Design
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Solution Overview
Problem
Existing ejection paddles in milling machines suffer from short useful life due to wear from debris impact, particularly lacking wear resistance along sides and using excessive material in complex designs.
Innovation Solution
The ejection paddle features a wear region projecting from the ejection surface along the top edge and side edges of the paddle body, forming a recessed region, which provides improved wear resistance and is manufactured as a unitary forged piece with a simplified design, conserving material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ejection paddle uses a complex reversible design with depressions, then wear resistance is improved, but device complexity increases and excessive material is used
Solution Approach 1:
The ejection paddle features a wear region with different properties than the paddle body. The wear region is formed with a curved, scoop-like shape that provides enhanced wear resistance specifically at the ejection surface, while the paddle body maintains a simpler structure. This local differentiation allows the paddle to have improved wear resistance without requiring complex reversible design throughout the entire component.
Solution Approach 2:
The ejection paddle is divided into distinct regions: a paddle body and a separate wear region. The wear region is replaceably mounted on the carrier, allowing it to be separated from the main paddle body. This segmentation enables the wear region to be replaced independently when worn, without replacing the entire paddle assembly, thus reducing overall device complexity and material usage.
2Reliability
If the ejection paddle uses a complex reversible design, then wear resistance is improved, but material usage increases
Solution Approach 1:
The wear region is extracted as a separate, replaceable component from the main paddle body. This wear region is mounted on a carrier and can be replaced independently when worn. By extracting only the wear-prone portion as a separate component, the design reduces overall material usage compared to making the entire paddle complex and reversible, while still providing improved wear resistance where needed.
3Device complexity
If the ejection paddle uses a simplified unitary design, then device complexity is reduced, but wear resistance decreases
Solution Approach 1:
The ejection paddle employs a composite structure consisting of a paddle body and a wear region made from different materials or material treatments. The wear region is specifically engineered with enhanced wear resistance properties, while the paddle body uses a simpler, less expensive material. This composite approach allows the overall design to remain relatively simple while providing targeted wear resistance where it is most needed.
Data Source
AI summary
In some implementations, an ejection paddle may include a paddle body having an ejection surface and a mounting surface opposite the ejection surface, and a wear region projecting from the ejection surface and extending along a top edge of the paddle body and at least a portion of a first side edge and a second side edge of the paddle body. The paddle body may be recessed relative to the wear region.