Baisteels
Application of Scanning Loop Detectors in Steel Rolling Production
Eu. Product Overview
The Scanning Loop Detector (Link) is a high-precision infrared scanning device designed to detect infrared radiation sources within a vertical field of view (with a narrow horizontal field). It outputs analog signals (4–20 mA current and 0–10 V voltage) proportional to the angular position of heat sources, enabling precise loop control and measurement in steel rolling processes.
II. Working Principle
The detector uses a rotating drum with a polygonal mirror to scan its optical area. When hot metal enters the field of view:
Infrared Detection: Reflected infrared radiation is captured by a photosensitive sensor.
Signal Conversion: Internal circuitry converts optical signals to electrical outputs:
Digital Output: A switch signal is triggered when radiation exceeds a preset threshold.
Analog Output: Calculates the heat source’s position as a percentage of the scanning area, generating corresponding 4–20 mA or 0–10 V signals.
III. Applications in Steel Rolling Production
The detector is critical in the following areas:
Loop Height Adjustment:
Measures loop height/position in bar, wire, and hot strip mills, enabling real-time loop control for stable rolling.
Strip Width Control:
Detects strip edges to assist width control systems, improving product consistency and yield rates.
Center Alignment:
Tracks the center position of strips or billets to ensure proper alignment between rolls, minimizing deviation and waste.
Crop Shear Optimization:
Precisely locates strip ends to optimize crop shear timing, enhancing cutting accuracy.
Continuous Casting & Edge Control:
Monitors slab edges during casting to control width/shape and ensures strip straightness in finishing lines.
IV. Key Advantages
The detector excels in steel rolling due to:
High Precision: Infrared technology ensures sub-millimeter accuracy in position/size measurement.
Real-Time Response: Fast processing (<10 ms) enables immediate adjustments to rolling parameters.
Non-Contact Detection: Eliminates mechanical wear and errors associated with physical sensors.
Easy Deployment: Compact design, simple installation, and low maintenance costs suit harsh mill environments.
V. Conclusion
The Scanning Loop Detector enhances rolling efficiency and product quality through precision, speed, and non-contact operation. By stabilizing processes and reducing downtime, it drives intelligent and automated steel production.
