Modular Polycrystalline Silicon Fracturing Teeth
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Solution Overview
Problem
Existing methods for fracturing polycrystalline silicon into fragments are inefficient and require replacing entire rolls when only some teeth are chipped or worn, leading to inefficiencies and maintenance challenges.
Innovation Solution
A double-roll fracturing apparatus with fracturing teeth units where only the worn teeth can be replaced, featuring cemented carbide or silicon material teeth and a fixing cover system that stabilizes the teeth and prevents contamination, allowing for efficient and uniform fragment production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire roll is replaced when teeth are chipped or worn, then the fracturing performance is restored, but the maintenance time and cost increase significantly
Solution Approach 1:
The roll is divided into modular segments where individual teeth or small groups of teeth can be independently replaced. The roll surface is structured with multiple replaceable tooth units that can be detached and replaced without affecting the entire roll, allowing selective maintenance of only the worn teeth while keeping the rest of the roll in service.
2Ease of manufacture
If manual breaking with hammers is used, then fragments can be obtained, but the process is inefficient and strains workers
Solution Approach 1:
Manual hammering is replaced with a mechanical roll-crushing system. The roll equipped with fracturing teeth mechanically crushes the polycrystalline silicon rods as they pass through, providing consistent and efficient fragment production without manual labor. The mechanical system delivers controlled force through rotating rolls, replacing the inefficient and labor-intensive manual breaking process.
3Strength
If thermal shock is used for initial breaking, then the rod can be broken into appropriate size, but additional processing steps are required
Solution Approach 1:
The thermal shock breaking step and the roll crushing step are merged into a single integrated process. The polycrystalline silicon rods undergo thermal shock to create initial cracks, and then immediately pass through the roll crusher where the fracturing teeth complete the fragmentation in one continuous operation. This combination eliminates the need for separate manual breaking steps and streamlines the overall process.
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
Enables continuous and efficient fracturing of polycrystalline silicon with easy maintenance by replacing only the worn teeth, reducing contamination risks and ensuring high-quality fragments for semiconductor production.
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
Implementation Method 2
it is typical to break the rod R into appropriate size by thermal shock or the like
Data Source
AI summary
An apparatus for fracturing polycrystalline silicon having: a pair of rolls rotated in a counter direction each other around parallel axes; and a plurality of fracturing teeth units provided on outer peripheral surfaces of the rolls, arranged along a circumferential direction of the rolls, and have a plurality of fracturing teeth and fixing covers fixing the fracturing teeth on the outer peripheral surfaces of the rolls, in which: the fracturing teeth has flanges; and the fixing covers are formed as strips along a longitudinal direction of the rolls, and in which the fixing covers are fixed on the rolls in a state in which top ends of the fracturing teeth are protruded outward radially of the rolls from the fixing hole outward so as to hold the flanges between the fixing covers and the rolls.