Roll Surface Foreign Matter Removal via Projectile Blasting
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Solution Overview
Problem
Existing roll surface maintenance technologies fail to effectively remove foreign matter from conveyance rolls in heating furnaces without causing defects or deforming the roll surface, leading to operational issues during steel strip conveyance.
Innovation Solution
A device comprising a blast processing unit with an ejection unit to project projectile materials, such as alumina particles, against the roll surface and a recovery unit to collect them, pressed against the roll surface to remove foreign matter and restore surface roughness, while a method involves pressing the blast processing unit against the roll and ejecting and recovering the projectile material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a foreign matter scraper means permanently attached inside the heating furnace is used to remove foreign matter from rolls during operation, then foreign matter removal is achieved, but the removed foreign matter adheres to the steel strip causing defects
Solution Approach 1:
The patent applies preliminary action by performing foreign matter removal during periodic maintenance when the heating furnace is halted, rather than during operation. This timing ensures that foreign matter is removed before it can adhere to steel strips during conveyance, preventing defects while maintaining roll surface roughness for proper steel strip grip.
2Strength
If shot peening is used to plastically deform the roll surface to generate compressional residual stress, then surface strength is improved, but the surface profile is deformed and foreign matter removal effectiveness is reduced
Solution Approach 1:
The patent extracts the foreign matter removal function from surface deformation methods like shot peening. Instead of using methods that deform the surface profile, the invention uses a blasting method that selectively removes foreign matter while preserving the original roll surface roughness and profile, maintaining both strength and foreign matter removal effectiveness.
Solution Approach 2:
The patent changes the parameter of surface treatment from plastic deformation (shot peening) to controlled erosion (blasting method). By adjusting blasting parameters such as projectile material type, particle size, and blasting pressure, the method achieves foreign matter removal without deforming the underlying roll surface profile, thus maintaining surface roughness for proper steel strip conveyance.
3Object-generated harmful factors
If particles strike the roll surface to remove foreign matter, then foreign matter is removed, but large deformation occurs to the roll profile affecting steel strip conveyance
Solution Approach 1:
The patent changes parameters including using lighter projectile materials (such as glass beads or metal oxides instead of heavy steel spheres), controlling particle size distribution, and regulating blasting pressure to achieve foreign matter removal with minimal impact on the roll surface profile. These parameter adjustments prevent large deformations that would affect steel strip conveyance while maintaining effective foreign matter removal.
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 enables simple and effective removal of foreign matter from roll surfaces inside heating furnaces, restoring surface roughness and preventing defects, thus improving the conveyance of steel strips by maintaining the roll's original profile.
Implementation Method 1
an ejection unit configured to eject a projectile material at a surface of a roll
Implementation Method 2
restore surface roughness
Data Source
AI summary
A device for removing foreign matter from a roll surface. The device includes a blast processing unit and a press unit. The blast processing unit includes an ejection unit configured to eject a projectile material at a surface of a roll that conveys a steel strip inside a heating furnace, and a recovery unit configured to recover the projectile material. The press unit is configured to press the blast processing unit toward the surface of the roll.