Tapered Cutting Element Reduces Bending Stress
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Solution Overview
Problem
Existing cutting devices for mining machines are inefficient in fracturing rock faces due to high bending stresses on cutting bits and limited durability, as well as the need for frequent replacement of worn cutting sections.
Innovation Solution
A cutting device with a modular cutting disc featuring a cutting ring with radially positioned cutting bits, where each bit is secured in a tapered bore, reducing bending stresses and allowing for easy replacement of individual bits, and an oscillating mechanism to enhance cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cutting bits are used in mining machines, then the cutting device can engage rock faces, but the cutting bits experience high bending stresses leading to limited durability and frequent replacement
Solution Approach 1:
The cutting device is divided into multiple independent cutting sections that can be individually replaced. Each cutting section contains cutting bits that are independently secured in tapered bores, allowing one bit to be replaced without affecting others, thereby improving reliability and reducing downtime.
Solution Approach 2:
The cutting bits are designed with a tapered geometry that allows them to be dynamically adjusted and secured in tapered bores. This dynamic securing mechanism reduces bending stresses by allowing slight adjustments in position and orientation during operation, improving durability.
2Loss of time
If cutting sections are designed for easy replacement, then maintenance time is reduced, but the structural complexity of the cutting device increases
Solution Approach 1:
The cutting device is segmented into modular cutting sections that can be independently removed and replaced. Each section is designed as a discrete unit with standardized interfaces, simplifying the replacement process despite the overall modular complexity.
Solution Approach 2:
Worn cutting bits are designed for easy removal and replacement while retaining the cutting section structure. The individual bits can be discarded and replaced without replacing the entire cutting section, reducing maintenance time and material waste.
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A cutting device for cutting rock includes a disc and a plurality of cutting elements secured to the disc. The disc is supported for rotation about an axis of rotation, and the disc includes a peripheral edge extending around the axis of rotation. The plurality of cutting elements are spaced apart along the peripheral edge of the disc and positioned in a cutting plane. Each of the cutting elements includes a base portion and a cutting portion including a cutting edge, and the cutting portion has a width that is larger than a width of the base portion.