Conical Grate Support for Grinding Mill Load Transfer
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Solution Overview
Problem
Existing open-ended grinding mills are limited to small sizes due to the inability of traditional grate designs to support larger charge loads, leading to restricted material transfer rates and reduced grinding efficiency caused by slurry flow back and short-circuiting.
Innovation Solution
A conical grate support element is introduced at the discharge end of the grinding mill, protruding outward from the mill shell, which provides increased stiffness and allows for a more open grate design without compromising the bearing journal, enabling larger charge loads and improved material transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional flat vertical end plate grate design is used, then the grate can support larger charge loads, but the open area is reduced and material transfer rates are limited
Solution Approach 1:
The patent applies curvature by transitioning from a flat vertical end plate to a conical grate support structure. The conical shape with sloped surface area provides both the structural strength to support charge loads and the geometric configuration to facilitate material flow, resolving the contradiction between strength and productivity.
Solution Approach 2:
The invention adds a dimensional element by extending the grate support structure outward from the mill shell at an angle (typically 30-60 degrees). This creates a three-dimensional conical configuration that increases open area while maintaining load support capability through the distributed structural geometry.
2Productivity
If open-ended design is implemented, then material transfer is improved, but the grate lacks sufficient stiffness for larger charge loads
Solution Approach 1:
The conical shape inherently provides structural stiffness through its geometric form. The sloped surfaces distribute loads more effectively than flat plates, and the outward extension creates a stiffer structure that can support larger charge loads while maintaining the open-ended design for improved material transfer.
Solution Approach 2:
The grate support structure is divided into multiple segments or bars arranged in a conical configuration. This segmentation allows the structure to achieve both stiffness through the distributed geometry and open area through the spaces between segments, resolving the contradiction between stiffness and material transfer capability.
3Reliability
If conventional grate design is used, then structural integrity is maintained, but slurry flow back and short-circuiting occur
Solution Approach 1:
The conical configuration with outward-sloping surfaces creates a geometric progression that directs slurry flow outward and away from the mill. This curved geometry prevents slurry from flowing back into the mill or short-circuiting, while the conical structure itself maintains structural integrity through its stable geometric form.
Data Source
AI summary
A grate support element for an open-ended grinding mill includes an outer perimeter section, an inner section, and at least one vane extending between the outer perimeter section and the inner section of the grate support element. The vane is angled with respect to a plane defined by the outer edge of the outer perimeter section in such a manner that the inner section is configured to be provided outwards from the plane defined by the outer edge of the outer perimeter section, when the grate support element is mounted to the open-ended grinding mill.