Earth Working Roll Tip With Side Relief
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Solution Overview
Problem
Earth-working rolls in mining and construction machines face high power requirements due to drag from cone tips, and the presence of earthen fines restricts tip rotation, leading to increased wear and maintenance costs.
Innovation Solution
A two-piece tip design with a base and a wear cap, where the wear cap is replaceable, and side relief on the tip reduces drag and wear, allowing for easier maintenance and lower material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cone tips are used to engage earthen material, then material crushing effectiveness is improved, but power requirement increases due to drag
Solution Approach 1:
The tip is divided into two separate components: a base and a wear cap. The wear cap is the segment that contacts the material and wears out, while the base remains intact. This segmentation allows the wear cap to be replaced without replacing the entire tip assembly, reducing material waste and cost while maintaining crushing effectiveness.
Solution Approach 2:
Hardfacing is applied selectively only to the wear cap portion of the tip, specifically on the leading surface that contacts the material, rather than the entire tip. This localized hardfacing provides wear resistance where needed while reducing overall material usage and cost.
2Reliability
If hardfacing is applied over the entire cone to extend usable life, then wear resistance is improved, but manufacturing cost increases
Solution Approach 1:
Hardfacing is applied selectively only to the wear cap portion of the tip, specifically on the leading surface that contacts the material, rather than the entire tip. This localized hardfacing provides wear resistance where needed while reducing overall material usage and cost.
Solution Approach 2:
The wear cap is designed as a replaceable component that wears out and can be discarded or replaced. This allows the use of less expensive materials for the wear cap compared to the base, and enables replacement without replacing the entire tip assembly, reducing overall cost.
3Device complexity
If tips are made as one-piece members, then structural simplicity is improved, but material waste increases when tips wear out
Solution Approach 1:
The tip is divided into two separate components: a base and a wear cap. The wear cap is the segment that contacts the material and wears out, while the base remains intact. This segmentation allows the wear cap to be replaced without replacing the entire tip assembly, reducing material waste and cost while maintaining crushing effectiveness.
Solution Approach 2:
The wear cap is designed as a separate, replaceable component that can be discarded when worn and the base can be recovered and reused. This separates the consumable part from the durable part, minimizing material waste and reducing replacement costs.
4Reliability
If earthen fines get embedded in the holder around the shaft, then tip rotation is restricted, but this increases wear and maintenance frequency
Solution Approach 1:
The tip is divided into two separate components: a base and a wear cap. The wear cap is the segment that contacts the material and wears out, while the base remains intact. This segmentation allows the wear cap to be replaced without replacing the entire tip assembly, reducing material waste and cost while maintaining crushing effectiveness.
Data Source
AI summary
A tip for use on an earth working roll for mining, construction and public works machines such as crushers, surface miners, milling machines and the like includes a working end provided with side relief to reduce drag and wearing, require less power to drive the rolls, and lengthen the usable life of the tip. The working end can also have a generally flat front surface to improve the yield in a crushing or other similar operation. The tip includes a base and a wear cap releasably secured together by a retainer.