Surface-Following Nozzle for Water-Free Rolling Roll Observation
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Solution Overview
Problem
Existing methods for observing the surface of rolling rolls in hot rolling mills face challenges due to the generation of bubbles in water columns, which can cause measurement failures and noise in ultrasonic range finders, and the inaccuracy of estimating roll profile changes, leading to defects in steel sheets.
Innovation Solution
A surface following nozzle with a gas-injecting tip, an extending and contracting part with an elastic body, and an optical observing part housed in an environment box, allowing for precise observation without water interference by controlling the gap between the nozzle and the roll surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water column is formed between the rolling roll and the observation camera to secure a measurement route, then the observation path is established, but bubbles are generated in the water column causing measurement failures and noise
Solution Approach 1:
The patent introduces gas as an intermediary substance to replace water in the observation path. Gas is injected through the nozzle to form a gas barrier between the observation camera and the rolling roll, preventing water from entering the optical path and eliminating bubble formation, thus resolving the contradiction between establishing an observation path and maintaining measurement accuracy
Solution Approach 2:
The patent applies pneumatic principles by using gas injection through a nozzle to create a gas column or gas barrier. The gas flow rate and pressure are controlled to maintain the gas barrier that protects the optical observation system from water interference, enabling reliable observations without measurement failures
2Temperature
If cooling water is supplied to the rolling roll, then the roll is cooled, but water interferes with the observation and causes bubbles
Solution Approach 1:
The patent segments the space around the rolling roll into different zones: a cooling water supply zone and a gas-protected observation zone. The gas injection nozzle creates a spatial separation where gas acts as a barrier layer, allowing cooling water to contact the roll for temperature control while preventing water from reaching the observation camera
Solution Approach 2:
Gas serves as an intermediary barrier between the cooling water and the observation system. The gas is injected to form a protective layer that allows thermal management of the roll to continue while blocking water from entering the observation path, thus eliminating water interference
3Device complexity
If the nozzle is fixed at a certain position, then the structure is simple, but it cannot follow the shape changes and distance changes of the rolling roll
Solution Approach 1:
The patent transforms the fixed nozzle into a dynamic system by adding an extending and contracting mechanism. The nozzle can dynamically adjust its position along the axial direction to follow the rolling roll's shape changes and distance variations, maintaining optimal observation conditions while keeping the overall structure relatively simple
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
Enables accurate observation of the rolling roll surface by removing water and following shape changes, improving measurement accuracy and preventing defects in steel sheets.
Implementation Method 1
an extending and contracting part provided at a rear side of the nozzle via the separating part, and extends and contracts along an axial direction of the nozzle, wherein the extending and contracting part includes an elastic body that applies a forward force with respect to the nozzle
Implementation Method 2
a nozzle that injects gas from a tip end thereof
Data Source
AI summary
The present invention provides a surface following nozzle, an observation device for a moving object surface, and an observation method for the moving object surface that can remove water in the vicinity of the nozzle while following changes in the shape and changes in the distance of a moving object. A surface following nozzle includes a nozzle that injects gas from a tip end thereof, a separating part that closes a base end of the nozzle, and an extending and contracting part that is provided at a rear side of the nozzle via the separating part, and extends and contracts along an axial direction of the nozzle. The extending and contracting part includes an elastic body that applies a forward force with respect to the nozzle.