Single Crystal Furnace Supporting Rod Cone Head Design
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Solution Overview
Problem
The cone head at the bottom of the supporting rod in single crystal furnaces is prone to breaking due to inadequate contact with the crucible shaft.
Innovation Solution
A supporting rod design featuring a cone head with a planar portion at the connection to the rod portion, allowing complete insertion into a conical hole of the crucible shaft and increased contact area with the crucible shaft's top edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cone head is designed for insertion into the crucible shaft, then the supporting rod can be assembled and function, but the cone head is prone to breaking due to insufficient contact area
Solution Approach 1:
The invention transitions from point contact to surface contact by adding a planar portion to the cone head structure. This dimensional change from zero-dimensional point contact to two-dimensional surface contact significantly increases the contact area with the crucible shaft, distributing mechanical stresses and preventing cone head breaking during operation
Solution Approach 2:
The planar portion is specifically located at the connection position between the rod portion and cone head, creating a localized area of enhanced contact quality. This local structural modification concentrates the stress distribution improvement exactly where the cone head connects to the crucible shaft, preventing breaking at this critical location
2Ease of manufacture
If the cone head structure is simplified for easy manufacture, then production cost decreases, but the contact area with crucible shaft is insufficient leading to cracking
Solution Approach 1:
The cone head is segmented into two functional portions: a conical insertion portion for fitting into the crucible shaft and a planar contact portion for increasing contact area. This segmentation allows each portion to perform its specific function optimally while maintaining manufacturing simplicity through standard machining operations
Solution Approach 2:
The invention changes the geometric parameters of the cone head by adding a planar surface at the base. This parameter change from a pure cone geometry to a composite geometry with planar and conical surfaces increases the contact area parameter, improving reliability without significantly complicating the manufacturing process
Data Source
AI summary
A supporting rod for single crystal furnace and a single crystal furnace are provided. The supporting rod for single crystal furnace includes a rod portion, and a cone head provided at a bottom rod portion. A planar portion is provided at where the cone head is connected with the rod portion, the cone head is completely inserted into a conical hole at a top of a crucible shaft, and the planar portion is in contact with a top edge of the crucible shaft.