Asymmetric Fracturing Teeth for Polysilicon Fragment Control
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Solution Overview
Problem
Existing fracturing apparatuses for polycrystalline silicon suffer from chipping, wearing, and breaking of fracturing teeth, leading to uncontrollable fragment size and contamination due to impurity generation, which deteriorates the quality of fractured fragments.
Innovation Solution
A counter-rotating roll-based apparatus with radially protruding fracturing teeth units, where each tooth has a larger base diameter than the top end, and a fixing cover with expanded and indented parts for staggered arrangement, preventing deformation and wear, and ensuring uniform fragment size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fracturing teeth are made with smaller diameter to reduce wear, then wear resistance improves, but strength and ability to fracture rigid polycrystalline silicon deteriorates
Solution Approach 1:
The fracturing teeth are designed with asymmetric geometry where the base part has a larger diameter than the top end. This asymmetric structure allows the base to have greater strength and wear resistance while the top maintains the necessary geometry for effective fracturing, resolving the contradiction between wear resistance and fracturing capability.
Solution Approach 2:
Different parts of the fracturing tooth have different diameters - the base part has a larger diameter for strength and wear resistance, while the top end has a smaller diameter for effective fracturing. This local variation in quality allows each part of the tooth to be optimized for its specific function, simultaneously achieving wear resistance and fracturing capability.
2Reliability
If fracturing teeth are made stronger to prevent chipping and breaking, then reliability improves, but impurity generation from abrasion increases
Solution Approach 1:
The asymmetric tooth design with larger base diameter provides enhanced strength and chip resistance at the base, while the smaller top diameter reduces the surface area subject to abrasion and impurity generation during fracturing, thus resolving the contradiction between reliability and harmful impurity generation.
Solution Approach 2:
The tooth structure implements local quality differentiation where the base part is designed for strength and durability (larger diameter), while the working surface at the top is optimized to minimize abrasion and impurity generation (smaller diameter), thereby simultaneously achieving chip resistance and reducing harmful factors.
3Ease of manufacture
If fracturing teeth are arranged in rows along circumferential direction, then manufacturing simplicity improves, but control over maximum target size of fragments deteriorates
Solution Approach 1:
The staggered arrangement of fracturing teeth breaks the simple row pattern, creating an asymmetric distribution that improves fragment size control. While this increases manufacturing complexity, the asymmetric positioning allows for better control of the maximum target size by creating more varied fracture paths and reducing the likelihood of consistently producing oversized fragments.
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 solution effectively prevents fracturing tooth wear and contamination, allowing for high-quality, uniformly sized fragments to be produced efficiently by maintaining the strength and stability of the fracturing teeth, thus enhancing the fracturing process.
Implementation Method 1
The roll-crasher fractures the rod-shaped polycrystalline silicon by collapsing between the teeth and an inner surface of the housing so as to impact the polycrystalline silicon continuously
Data Source
AI summary
An apparatus for fracturing in which: a fracturing tooth is formed so as to have a larger base part than a top end; a fixing cover is formed along a longitudinal direction of rolls and is provided with fixing holes for fracturing teeth arranged along the longitudinal direction, expanded parts which are formed by expanding both sides of the fixing holes, and an indented part which is formed by narrowing a part between the fixing holes with respect to the expanded parts; the base part of the fracturing tooth is held between the roll and the fixing cover fixed on the roll and the indented part and the expanded part of the adjacent fixing cover are engaged with each other in fracturing teeth unit, so that the fracturing teeth are arranged in a staggered manner.