Measuring Roller Spray Cooling for Accurate Hot Strip Flatness
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Solution Overview
Problem
Existing flatness measuring systems for metal strips in hot rolling mills face challenges in maintaining high accuracy and robustness due to temperature and wear demands, with previous cooling methods causing measurement interference and product quality issues.
Innovation Solution
A flatness measuring apparatus with a deflection roller equipped with a sensor system and a cooling system featuring a nozzle bar with spray nozzles aligned at a shallow angle to the roller surface, ensuring effective cooling without interfering with the measurement, and a housing design to minimize cooling medium escape and maintain product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the measuring roller is cooled by a cooling box arranged below the roller, then the roller can be cooled, but two additional rollers are required above the strip and the cooling is not effective due to low relative speeds
Solution Approach 1:
A fluid barrier (gas or liquid curtain) is introduced as an intermediary between the cooling box and the strip to prevent direct contact between the cooling medium and the strip, while still allowing effective cooling of the measuring roller through the barrier
Solution Approach 2:
A gas or liquid curtain is used to separate the cooling zone from the strip path, enabling effective cooling of the roller while preventing the cooling medium from contacting the strip and interfering with the measurement
2Temperature
If spray cooling systems are used on the measuring roller, then cooling efficiency is improved, but the measurement is disturbed due to forces exerted by the cooling nozzle jet on the roller surface
Solution Approach 1:
The cooling system is designed with localized cooling zones and optimized spray patterns to apply cooling only where needed on the roller surface, reducing unnecessary jet forces on measurement-critical areas while maintaining cooling efficiency
Solution Approach 2:
The cooling system parameters (spray angle, pressure, flow rate) are optimized to achieve effective cooling while minimizing the impact forces on the roller surface that would interfere with measurement accuracy
3Temperature
If the measuring roller is arranged above the strip for cooling, then cooling efficiency is improved, but the cooling medium influences the cooling process of the strip and changes product quality
Solution Approach 1:
A fluid barrier (gas or liquid curtain) serves as an intermediary that allows the cooling medium to effectively cool the measuring roller while preventing direct contact with the strip, thus maintaining product quality
Solution Approach 2:
A thin film or curtain of gas or liquid is used to separate the cooling medium from the strip, creating a protective barrier that allows cooling to proceed effectively without contaminating or adversely affecting the strip surface
4Reliability
If wipers on a closed cooling box are used to keep cooling medium in the closed space, then cooling medium containment is improved, but measurement signal is interfered with due to pressure exerted by wipers on the measuring roller
Solution Approach 1:
A gas or liquid cushion is used to seal the cooling box and contain the cooling medium without requiring mechanical wipers that would contact and interfere with the measuring roller, thus maintaining both containment and measurement accuracy
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 provides effective cooling of the measuring roller at high temperatures, protects sensitive sensors, and maintains measurement accuracy while preventing thermal or mechanical interference, ensuring the quality of the produced product.
Implementation Method 1
a cooling system featuring a nozzle bar with spray nozzles aligned at a shallow angle to the roller surface, ensuring effective cooling
Implementation Method 2
A flatness measuring apparatus with a deflection roller equipped with a sensor system and a cooling system featuring a nozzle bar with spray nozzles
Data Source
AI summary
A flatness measuring apparatus for measuring the flatness of a metallic strip, including a measuring roller which has a roller axis and which makes contact with the strip for the measuring the flatness. The measuring roller is connected to a cooling system, using which the measuring roller can be cooled. To ensure that a high degree of measuring accuracy can be maintained even at high temperatures, the cooling system has a nozzle bar that extends parallel to the roller axis. At least one spray nozzle is arranged on the nozzle bar, using which cooling medium can be sprayed on the surface of the measuring roller in a spraying direction. The spraying direction meets a surface section of the measuring roller, and the angle between the spraying direction and the tangent on the measuring roller at the location of the surface section is less than 30°.