Roller Shaft Insulation Blanket for Annealing Furnace Bearing Heat
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-temperature intra-furnace gas in continuous annealing furnaces causes grease in roller bearings to evaporate and carbonize, leading to soot formation and reduced heating efficiency, as well as surface defects on steel sheets.
Innovation Solution
A roller shaft portion thermal insulation member using an inorganic fiber blanket with a low shot content and high remaining thickness after cycle testing at 1000°C, which is designed to prevent heat transfer and lubricant leakage, comprising a casing with inorganic fiber blankets that surround the roller shaft and are secured to the furnace wall, effectively blocking high-temperature gas and preventing grease carbonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional inorganic fiber blanket with high shot content is used for thermal insulation, then the insulation structure can be simply provided, but the shots cause dust particles that adhere to steel sheets and reduce heating efficiency
Solution Approach 1:
The patent changes the critical parameter of shot content in the inorganic fiber blanket from conventional high levels to 3% or smaller for shots of 45 μm or greater. This parameter change eliminates the harmful dust particles while maintaining the thermal insulation function, resolving the contradiction between simple structure provision and prevention of soot adhesion.
2Device complexity
If no thermal insulation member is provided at the roller shaft portion, then the structure remains simple, but heat of intra-furnace gas causes grease to evaporate and carbonize
Solution Approach 1:
The patent introduces a thermal insulation member as an intermediary substance between the high-temperature intra-furnace gas and the roller bearing. This intermediary blocks heat transfer to the bearing, preventing grease carbonization while maintaining structural simplicity, thus resolving the contradiction between device complexity and reliability.
3Temperature
If a thick inorganic fiber blanket is used to ensure high temperature resistance, then thermal insulation performance is improved, but the blanket weight and space occupation increase
Solution Approach 1:
The patent uses a composite material approach by selecting inorganic fiber blankets with specific shot content characteristics (3% or smaller for 45 μm or greater shots) that provide superior high-temperature resistance. This allows achieving the required thermal insulation performance at 1000°C without increasing thickness, thereby avoiding additional weight and space occupation.
4Ease of manufacture
If the inorganic fiber blanket has high shot content, then the material is easier to manufacture, but the remaining thickness after cycle testing decreases
Solution Approach 1:
The patent changes the manufacturing parameter of shot content to 3% or smaller for shots of 45 μm or greater. This parameter change improves the stability of blanket thickness after cycle testing at high temperatures, preventing excessive degradation while maintaining manufacturability through controlled fiberization processes.
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 suppresses the increase in bearing temperature, prevents soot generation, reduces surface defects, and maintains heating efficiency by preventing the movement of particulate foreign matter and soot into the furnace, thus minimizing the need for frequent cleaning and maintaining the integrity of the roller shaft.
Implementation Method 1
a roller shaft portion thermal insulation member for a continuous annealing furnace provided between a roller insertion hole and a roller bearing of the continuous annealing furnace, the roller shaft portion thermal insulation member comprising: at least one inorganic fiber blanket which is in contact with an outer circumferential surface of a roller or which is disposed near the outer circumferential surface of the roller
Data Source
AI summary
Provided is a roller shaft insulation member for reducing the heat which is conducted to the bearings by passing through the space between the roller insertion hole of a continuous annealing furnace and the roller, wherein the roller shaft insulation member of the continuous annealing furnace comprises an inorganic fiber blanket, which contacts or is near the outer circumferential surface of the roller and in which the content of 45 μm or larger shot is 3% or less. A continuous annealing furnace provided with said roller shaft insulation member is also provided.