Impact Type Mechanical Scale Removal Device for Hot Rolled Slabs
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Solution Overview
Problem
Current descaling methods for hot rolled slabs, such as high-pressure water descaling, are inefficient in removing oxide layers from high-temperature slabs like stainless steel and iron-nickel alloys, causing temperature drops and surface damage, and fail to effectively clear non-ferric oxides, affecting product quality.
Innovation Solution
An impact-type mechanical descaling device using rotational centrifugal tooth plate groups to separate scales from hot rolled slabs, followed by low-medium pressure water to remove them, minimizing temperature changes and ensuring surface cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-pressure water descaling is used, then scales can be removed from the surface, but the surface temperature drops sharply causing edge cracks
Solution Approach 1:
The patent replaces the hydraulic system (high-pressure water) with a mechanical system (rotating toothed rollers) for the primary descaling action. The mechanical impact of the rotating teeth knocks scales off the slab surface through direct contact, eliminating the need for large quantities of high-pressure water that cause temperature drops.
Solution Approach 2:
The patent changes the descaling mechanism from hydraulic pressure to mechanical impact force. By using rotating toothed rollers that physically contact and impact the slab surface, the system achieves effective scale removal without the thermal side effects of high-pressure water, maintaining slab temperature within acceptable ranges.
2Manufacturing precision
If high-pressure water descaling is used, then water can penetrate to remove scales, but scales are pressed into the blank during follow-up rolling
Solution Approach 1:
The patent replaces water-based penetration with mechanical impact. The rotating toothed rollers deliver direct mechanical force to fracture and detach scales from the surface, preventing scale embedding that occurs with water pressure methods. The mechanical action removes scales cleanly without forcing them into the blank.
3Manufacturing precision
If high-pressure water descaling is used, then water can clear scales, but non-ferric oxides cannot be removed affecting surface quality
Solution Approach 1:
The patent replaces chemical/water-based removal with mechanical impact. The rotating toothed rollers physically fracture and detach all types of oxide scales including non-ferric oxides (silicon oxide, chromic oxide, nickel oxide) through direct mechanical contact, making the system effective for all steel types including high alloy steels where water descaling fails.
4Manufacturing precision
If a large quantity of water is used for descaling, then scales can be washed away, but temperature drop of the continuous casting blank increases
Solution Approach 1:
The patent replaces water-based washing with mechanical impact removal. The rotating toothed rollers detach and remove scales through mechanical force, eliminating the need for large quantities of water that would otherwise absorb heat from the slab and cause temperature drops, thereby preserving thermal energy.
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 effectively removes scales from various steel types, including stainless steel and iron-nickel alloys, with reduced water and energy consumption, maintaining slab temperature and improving rolling quality by ensuring a clean surface with minimal temperature impact.
Implementation Method 1
utilizes rotational centrifugal tooth plate groups to knock the surface of a continuous-casting blank so as to separate scales therefrom
Implementation Method 2
utilizes low-medium pressure water to obliterate away the separated scales
Data Source
AI summary
A hot rolled slab impact type mechanical scale removal device comprises a front cooling water nozzle group, an impact type scale removal gear roller group, a roller cooling device and a cleaning water nozzle group. A slab moves on a slab roller table. The front cooling water nozzle group, the impact type scale removal gear roller group and the cleaning water nozzle group are arranged in sequence along the movement direction of the slab. The impact type scale removal gear roller group is arranged on a support seat. The cooling water nozzle of the roller cooling device is arranged corresponding to the impact type scale removal gear roller group. According to the scale removal device, the oxide skins can be clearly removed, the temperature of the continuous casting slabs can be reduced and the hot rolling quality is improved.