Conjugate Anvil Hammer Mill Dynamics
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Solution Overview
Problem
Conventional rock grinding mills are energy-intensive and costly, with inefficiencies in reducing large rocks to smaller sizes due to high power consumption and material jamming issues between static shields and rotating rollers.
Innovation Solution
A conjugate anvil-hammer mill design featuring a rotating outer ring with anvil pockets and an inner hammer ring with protruding elements, operating in synchronized motion to apply linear compression and shear forces, reducing power consumption and preventing jamming through dynamic gap adjustment and surface texture engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional grinding mills use static shields and rotating rollers to crush rocks, then rock size reduction is achieved, but material jamming occurs and power consumption increases
Solution Approach 1:
The patent applies the dynamics principle by making both the anvil ring and hammer ring rotate in synchronized motion rather than using a static shield. The rotating anvil ring with pockets and the rotating hammer ring with protrusions create a dynamic crushing system that prevents material jamming while maintaining effective rock size reduction. The synchronized rotation ensures continuous movement of material through the crushing zones.
Solution Approach 2:
The patent applies segmentation by dividing the crushing surface into multiple pockets on the anvil ring and corresponding protrusions on the hammer ring. This segmentation creates multiple discrete crushing zones that process material in parallel, improving overall productivity while distributing the mechanical load to reduce power consumption peaks.
2Productivity
If conventional grinding mills use static shields and rotating rollers to crush rocks, then rock size reduction is achieved, but material jamming occurs between the shield and rollers
Solution Approach 1:
The patent eliminates material jamming by replacing the static shield with a rotating anvil ring that moves in synchronization with the hammer ring. This dynamic configuration ensures continuous material flow through the crushing zones, preventing the jamming that occurs with static components. The rotating pockets and protrusions actively propel material forward rather than allowing it to accumulate.
Solution Approach 2:
The patent applies preliminary action by designing the synchronized rotation system to pre-position the pockets and protrusions optimally before material enters the crushing zone. This ensures smooth material engagement and continuous flow, preventing jamming before it can occur.
3Productivity
If conventional grinding mills use large cylindrical grinding sections to comminute rocks, then rock size is reduced, but the mill requires tremendous power to operate
Solution Approach 1:
The patent significantly reduces power requirements by using synchronized rotation of the anvil and hammer rings instead of a large cylindrical grinding section. The dynamic crushing action with rotating pockets and protrusions achieves effective comminution with much lower power input compared to traditional grinding mills, while maintaining rock size reduction capability.
Solution Approach 2:
The patent applies parameter changes by transitioning from the high-power, slow-speed operation of conventional grinding mills to a lower-power, synchronized rotational system. The linear rate of compression and controlled closing action at the 6 o'clock orientation optimize the power-to-productivity ratio, achieving effective comminution with reduced power consumption.
4Stress or pressure
If the anvil-hammer centers are offset to create closing action for compression, then compression stress is maximized at 6 o'clock orientation, but the mechanical structure becomes more complex
Solution Approach 1:
The patent applies asymmetry by offsetting the centers of the anvil ring and hammer ring to create a non-uniform gap that closes at the 6 o'clock orientation. This asymmetric configuration maximizes compression stress on the rock at the point of closest approach, improving comminution effectiveness. The offset design is simpler than alternative mechanisms for achieving the same compression effect.
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 conjugate anvil-hammer mill effectively reduces rock size with lower power consumption and enhanced efficiency by applying consistent compression and shear forces, minimizing material jamming and increasing throughput while maintaining mechanical advantage and wear resistance.
Implementation Method 1
Material may be inserted into the chamber and crushed between the inner ring and the outer ring with a linear rate of compression
Implementation Method 2
The anvil pocket and hammer protrusion create a surface texture that grabs and captures the rock during their concurrent rotating motion
Data Source
AI summary
A crushing mill with an internal ring inside an external ring is disclosed. In some embodiments, the inner ring has protrusions that fit within pockets in the outer ring such that as the rings rotate rock or other materials may be crushed between the protrusions and pockets of the inner and outer rings, respectively. In some embodiments, the inner and outer rings each have surface protrusions such that rock or other materials may be crushed between the inner and outer rings as they rotate. In some embodiments, the inner ring has a circumferential ridge that fits within a circumferential groove of the outer ring such that rock or other materials may be crushed between the rings. In some embodiments the rings operate at differential speeds with respect to each other to induce shear forces on the material to be crushed.