Grinding Roller Stress Offset Design
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Solution Overview
Problem
The existing grinding roller designs for coal grinders face issues with securing the fatigue strength of the roller housing, leading to potential durability problems due to stress concentration from grinding loads and fastening stresses, which can reduce the product life.
Innovation Solution
The grinding roller design offsets the lines of stress concentration from fastening and grinding loads to prevent intersection, using tab holes and tabs with specific surface orientations and shapes to disperse stress, and incorporates a pressing plate configuration that alleviates stress concentration in the roller housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the roller main body is fixed to the roller housing using a pressing plate and tabs, then the roller main body is securely fixed in axial and rotational directions, but stress concentration occurs at the tab holes and stopper part, reducing fatigue strength
Solution Approach 1:
The patent applies local quality by giving different geometric characteristics to different parts of the tab hole. Specifically, the tab hole has a curved surface shape at its base portion rather than a uniform cylindrical shape. This localized geometric modification concentrates the stress relief effect at the critical location where stress concentration occurs, without affecting the overall fixing function of the tab-hole-tab assembly.
Solution Approach 2:
The patent implements spheroidality by forming the base portion of the tab hole with a curved surface shape instead of a sharp corner or flat bottom. This curvature eliminates stress concentration points that would occur at sharp transitions, distributing the stress more evenly throughout the tab hole structure and improving fatigue strength while maintaining the fixing stability.
2Stability of the object's composition
If the pressing plate is fastened to the roller housing to fix the roller main body, then axial fixation is achieved, but fastening stress concentrates at the base portion of the fixing stopper part, leading to stress superposition with grinding loads
Solution Approach 1:
The patent applies local quality by modifying the geometric characteristics of the tab hole base portion with a curved surface. This localized modification specifically addresses the stress concentration issue at the critical location where the tab hole meets the stopper part, without affecting the overall axial fixation function provided by the pressing plate and stopper part assembly.
Data Source
AI summary
A grinding roller is configured so that the fatigue strength of a roller housing can be ensured, and product life can thus be ensured. The grinding roller includes: a roller housing; a roller main body; a pressing plate; a tab hole; and a tab. A line at which fastening stress caused by the pressing plate is concentrated on a base portion of a fixing stopper part of the roller housing and a line at which stress caused by a grinding load received by the roller main body is concentrated on a base portion of the tab hole of the roller housing are disposed in an offset manner so as not to intersect each other.