Slurry Coating Device with Swinging Nozzle for Steel Sheet
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Solution Overview
Problem
Wrinkle-like shape defects occur during the manufacturing of grain-oriented electrical steel sheets due to non-uniform film thickness distribution of the annealing separator slurry, leading to reduced yield and product discard.
Innovation Solution
A slurry coating device and method where the slurry feeding nozzle or the steel sheet is made to swing relative to the sheet's width direction, smoothing the film thickness distribution and preventing buildups when the sheet is wound into a coil, thereby controlling shape defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slurry is applied using conventional feeding nozzles and squeeze rolls, then the coating process is simple and efficient, but the film thickness distribution becomes non-uniform causing wrinkle-like shape defects
Solution Approach 1:
The patent introduces a swinging mechanism that dynamically moves the feeding nozzle or squeeze rolls in the width direction during the coating process. This dynamic motion transforms the static coating application into a dynamic process, allowing the coating elements to sweep across the steel sheet width and achieve uniform film thickness distribution while maintaining high coating efficiency
Solution Approach 2:
The swinging mechanism performs periodic oscillatory motion in the width direction, creating a regular back-and-forth coating pattern. This periodic action ensures that each section of the steel sheet receives consistent coating coverage over time, eliminating non-uniform film thickness and preventing wrinkle-like shape defects during subsequent annealing
2Manufacturing precision
If multiple nozzles are installed at intervals to improve film thickness distribution, then the coating uniformity improves, but the device complexity and installation space requirements increase
Solution Approach 1:
Instead of installing multiple static nozzles, the patent employs a single or limited number of nozzles equipped with a swinging mechanism. This dynamic approach allows one nozzle to cover the entire width direction through its oscillatory motion, achieving the same coating uniformity as multiple nozzles would provide while significantly reducing device complexity and installation requirements
Solution Approach 2:
The patent adds the time dimension to the coating process by introducing periodic swinging motion in the width direction. This transforms a one-dimensional coating problem (across the sheet width) into a two-dimensional solution space (width + time), allowing a single nozzle to achieve uniform coverage that would otherwise require multiple nozzles positioned at different locations
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 wrinkle-like shape defects along the longitudinal direction of the steel sheet, improving the yield in steel sheet manufacturing by ensuring a more uniform coating and preventing defects during the flattening annealing process.
Implementation Method 1
the slurry feeding nozzle 3 or the band-like body 1 is made to swing relatively to the other in a direction substantially parallel to a face of the band-like body 1 and substantially perpendicular to a direction of discharging the band-like body 1
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4C
AI summary
A slurry coating device according to one embodiment of the present invention applies slurry on a running band-like body, and includes a slurry dispensing unit configured to be able to feed the slurry on the band-like body. The slurry coating device feeds the slurry on the band-like body by the slurry dispensing unit while varying the relative positional relation of the slurry dispensing unit and the band-like body in a direction substantially parallel to a face of the band-like body and substantially perpendicular to a running direction of the band-like body.