Angled Degradation Pick With Offset Tip Axis
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Solution Overview
Problem
Existing degradation picks are prone to fracturing under side impact forces, particularly when experiencing forces at angles greater than 35 degrees, and are often limited to use at a single angle, which restricts their application in diverse material degradation scenarios.
Innovation Solution
A degradation pick design featuring a hardened tip with an axis offset from the central axis of a cylindrical shaft, incorporating a protruding spine and a locking mechanism, allowing the tip to be positioned at various angles relative to the shaft, enabling effective engagement of materials at multiple angles and resisting rotational and axial displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If degradation picks are designed with axially symmetrical geometry, then they can be inserted into blocks at multiple angles, but they experience fracture when subjected to impact forces at angles greater than 35 degrees off axis
Solution Approach 1:
The degradation pick employs an asymmetric geometry where the hardened tip axis is offset from the shaft central axis by a specific angle (7-25 degrees). This asymmetric configuration allows the pick to be inserted at multiple angles while maintaining optimal impact force alignment, resolving the contradiction between insertion flexibility and fracture resistance
Solution Approach 2:
The design incorporates a rotatable shaft that can be positioned at different angular orientations relative to the shaft central axis and locked in place. This dynamic adjustment capability allows the hardened tip to maintain ideal impact angles across various insertion configurations, simultaneously achieving versatility and reliability
2Reliability
If degradation picks are designed for axial impact forces only, then they experience less fracture, but they cannot effectively engage materials at angled impact forces
Solution Approach 1:
The offset between the hardened tip axis and shaft central axis creates an asymmetric structure that naturally accommodates angled impact forces. The offset angle ranges from 7 to 25 degrees, allowing the tip to experience forces at ideal angles even when the shaft is subjected to non-axial impacts, thus maintaining both reliability and adaptability
Solution Approach 2:
The rotatable shaft mechanism enables dynamic adjustment of the hardened tip orientation. By rotating the shaft to different angular positions and locking it, the system can adapt to various impact angle requirements while maintaining optimal force transmission to the tip, preventing fracture across diverse operational conditions
Data Source
AI summary
A degradation pick of the type used in such fields as road milling, mining, and trenching to engage and degrade tough materials such as asphalt, concrete, and rock may comprise a body attached at one end to a substantially cylindrical shaft. A hardened tip may also be attached to the body opposite the shaft. The hardened tip may comprise an axis offset from a central axis of the shaft. Such a degradation pick may be secured to an exterior of a rotatable drum or continuous chain so as to be repeatedly brought into contact with a surface of a material to be degraded. The body may comprise a protruding spine adjacent the hardened tip and opposite a direction of travel of the hardened tip when transported by a rotating drum or continuous chain.