Single Crystal Pulling Device Neck Relief Mechanism
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Solution Overview
Problem
Existing supporting devices for pulling single crystals with widened portions between neck portions suffer from high particle formation and irreversible gripping mechanisms, which hinder crystal growth and make it difficult to relieve the upper neck portion without causing dislocations.
Innovation Solution
A supporting device with pivotable gripping catches mounted on a supporting ring, operated by bearing and auxiliary cables wound on cable drums, allowing for reversible and controlled movement to relieve the upper neck portion without causing particle formation, ensuring secure load transfer and minimizing dislocation events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If gripping catches are used to support the single crystal, then the upper neck portion can be relieved, but particle formation increases and crystal growth is hindered
Solution Approach 1:
The patent replaces the mechanical gripping catches with a magnetic field-based suspension system. Magnets are positioned to generate magnetic fields that hold the single crystal suspended without physical contact, eliminating the mechanical gripping mechanism that causes particle formation while maintaining the ability to relieve the upper neck portion.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the supporting device and the single crystal. Instead of direct mechanical contact through gripping catches, the magnetic field serves as a non-contact mediator that provides the necessary support force while avoiding particle generation at the crystal surface.
2Strength
If gripping catches are tilted into holding position, then load transfer is achieved, but the catches cannot be moved back and back-melting is prevented
Solution Approach 1:
The patent employs a dynamic magnetic field configuration where the position and strength of magnets can be continuously adjusted. This allows the supporting force to be dynamically controlled, enabling the system to transition between supporting and non-supporting states, thus providing reversibility for back-melting operations.
Solution Approach 2:
The patent changes the magnetic field parameters (strength, position, distribution) to control the supporting force. By adjusting these parameters, the system can selectively activate or deactivate the support function, allowing reversible operation for both relieving the neck portion and performing back-melting operations.
3Adaptability or versatility
If arms move past one another in shearing fashion, then reversible engagement is achieved, but particle formation increases
Solution Approach 1:
The patent eliminates the shearing mechanical motion of arms by using a magnetic field-based system. The magnetic fields can be adjusted to provide reversible engagement without any mechanical contact or shearing motion, thus preventing particle formation while maintaining adaptability for both relieving and back-melting operations.
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 device enables reversible relief of the upper neck portion, reducing particle formation and ensuring stable load transfer, thus supporting the growth of single crystals with minimal disruption, allowing for controlled load management and reduced risk of dislocations.
Implementation Method 1
cable drums for winding bearing cables and auxiliary cables which are fastened on the gripping catches on both sides of the axis of the bearing of the gripping catches
Implementation Method 2
auxiliary rollers for changing the cable path of the auxiliary cables, as a result of which the pivoting movement of the gripping catches is brought about
Data Source
AI summary
A device for pulling a single crystal from a melt having a widened portion between an upper and a lower neck portion including a pulling device having a pulling device cable drum configured to wind a pulling cable, the pulling cable configured to pull the single crystal and a supporting device configured to relieve the upper neck portion of a weight of the single crystal.