Polycrystalline Silicon Rod Comminution via Segmented Striking
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Solution Overview
Problem
Existing methods for comminuting polycrystalline silicon rods require excessive energy and result in contamination and unsatisfactory component lifespan, as they often necessitate multiple strikes or high-pressure applications.
Innovation Solution
An apparatus and method utilizing a base with movable comminuting tools and immovable anvils, where the tools and anvils are positioned to ensure a single point of contact with the silicon rod, allowing for efficient comminution with minimal striking energy by aligning the transverse axis through the rod center and using tungsten carbide or hard-metal-coated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure water jet or shock waves are used for comminution, then comminution effectiveness is improved, but energy consumption increases and component lifespan decreases
Solution Approach 1:
The comminution process is divided into multiple sequential strikes by multiple hammer heads instead of using excessive energy from a single high-pressure water jet or shock wave system. Each hammer head delivers a controlled, localized strike that progressively fragments the silicon rod, reducing total energy consumption while maintaining effectiveness.
Solution Approach 2:
The apparatus uses periodic striking action with multiple hammer heads that sequentially impact the silicon rod. This periodic mechanical striking replaces continuous high-energy applications (like sustained high-pressure water jets), allowing energy to be delivered in controlled pulses that are more efficient and less damaging to components.
2Productivity
If multiple strikes or high-pressure applications are used, then comminution completeness is improved, but contamination increases
Solution Approach 1:
The hammer heads are designed as replaceable, relatively simple components that can be easily replaced when worn or contaminated. This allows maintaining comminution effectiveness without accumulating contamination in the silicon, as the hammer heads serve as sacrificial elements that protect the main apparatus and silicon quality.
Solution Approach 2:
Contaminated or worn hammer heads are discarded and replaced with fresh ones, preventing contamination buildup in the system. This simple replacement strategy maintains comminution completeness over time without introducing harmful contamination into the silicon material.
3Productivity
If mechanical force action is applied to comminute silicon rod, then comminution is achieved, but component service life becomes unsatisfactory
Solution Approach 1:
The mechanical force is segmented into multiple smaller strikes from multiple hammer heads rather than one large force application. This distributes the mechanical stress across multiple components, preventing any single component from experiencing excessive wear that would reduce service life.
Solution Approach 2:
The apparatus changes the parameters of mechanical action by using multiple hammer heads with controlled strike forces rather than a single high-force application. This modifies the stress distribution and impact characteristics, extending component service life while maintaining comminution effectiveness.
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
Achieves optimal crushing with reduced energy consumption, minimizing contamination and extending the lifespan of components, as demonstrated by successful crushing of compact silicon rods with diameters over 150 mm using as little as 200 J of striking energy.
Implementation Method 1
a striking momentum is started, wherein when the striking momentum is started, tool and silicon rod are not touching, whereupon the comminuting tool effects a comminution of the silicon rod
Data Source
AI summary
An apparatus is disclosed for comminuting a polycrystalline silicon rod, which apparatus includes a base, at least one movable comminuting tool and optionally at least one immovable anvil. A silicon rod to be comminuted lies on a longitudinal axis oriented parallel or virtually parallel to the surface of the base and can be adjusted between the comminuting tool and anvil. Also disclosed is a method for comminuting a polycrystalline silicon rod.