Mono Roller Grinding Mill Offset Axis Shear Compression
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Solution Overview
Problem
Conventional rock grinding mills are energy-intensive and costly to maintain, with inefficiencies due to torque and jamming issues, particularly when dealing with large rocks and varying material hardness.
Innovation Solution
A mono roller grinding mill (MRGM) design featuring a cylindrical shell with a floating roller that rotates within, applying compression and shear forces through offset centers and textured surfaces, eliminating the need for external pressure systems and drive mechanisms, allowing for efficient comminution without jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional grinding mills use large rotating cylinders with lifting ribs and balls to comminute material, then material can be broken up effectively, but power consumption becomes tremendous and maintenance costs increase substantially
Solution Approach 1:
The invention divides the grinding chamber into multiple compartments separated by partitions, with each compartment containing a smaller roller instead of one large rotating cylinder. This segmentation allows material to be processed in stages through multiple compression zones, achieving effective comminution while reducing the energy required by each individual roller and eliminating the need for massive lifting ribs and balls.
Solution Approach 2:
Instead of using a large rotating cylinder that lifts and drops material (conventional approach), the invention uses stationary or slowly rotating rollers that apply direct compression forces to material. The rollers are arranged to create compression zones between them and the chamber walls, inverting the traditional lifting-dropping mechanism into a direct compression approach that consumes less power.
2Productivity
If conventional grinding mills use large rotating cylinders with lifting ribs, then material can be carried upward and tumble back for breaking, but torque requirements increase and jamming issues occur with large rocks and varying material hardness
Solution Approach 1:
The invention employs rollers that can rotate at different speeds and directions, creating dynamic compression zones that adapt to material flow conditions. The rollers are positioned to create varying gap sizes and compression forces as they rotate, providing dynamic material circulation without requiring the high torque of lifting ribs. This dynamic approach prevents jamming by continuously varying the compression zones.
Solution Approach 2:
The invention changes the operational parameters by using multiple rollers with different rotation speeds, directions, and positions within each compartment. This creates varying compression forces and material flow patterns throughout the grinding chamber, enabling effective processing of large rocks and materials with varying hardness without the torque and jamming problems of conventional single-cylinder designs.
3Productivity
If conventional grinding mills use large rotating cylinders, then comminution can be achieved, but maintenance and operational costs become substantial
Solution Approach 1:
By dividing the grinding chamber into multiple compartments with smaller rollers, the invention reduces the size and complexity of each individual component. This segmentation makes the rollers easier to manufacture, install, and maintain compared to a single large rotating cylinder. If one roller wears out or fails, only that specific roller needs replacement rather than the entire grinding chamber assembly.
Solution Approach 2:
The smaller rollers in each compartment can be designed as simpler, more economical components that are easier to replace than large cylinder linings or lifting ribs. The modular compartment design allows individual rollers to be quickly swapped out without shutting down the entire mill, reducing maintenance downtime and operational costs while maintaining continuous comminution output.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MRGM reduces power consumption, capital costs, and operational complexity by utilizing the weight and differential speeds of the roller and shell to achieve efficient compression fracture of materials, minimizing jamming and enhancing throughput.
Implementation Method 1
The shell and roller cooperate to apply compression and shear forces to the material, fracturing it into smaller particles
Implementation Method 2
The shell and roller cooperate to apply compression and shear forces to the material, fracturing it into smaller particles
Data Source
AI summary
A crushing mill with a single roller inside a driven cylindrical shell inner surface, both with horizontal and parallel but offset axes is disclosed. In some embodiments, the roller has protrusions such that as the roller and shell rotate rock or other material may be crushed between the shell and the roller, respectively. In some embodiments, the shell and the roller each have surface protrusions such that rock or other materials may be crushed between the shell and the roller as they rotate. In some embodiments the shell and the roller operate at differential speeds with respect to each other to induce shear forces on the material to be crushed.