Rotating Jet Nozzle for Uniform Descaling of Hot Rolled Steel
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Solution Overview
Problem
Existing descaling devices for rolling stock suffer from uneven cleaning, where edge areas are more exposed to liquid jets, leading to heat streaks and inhomogeneous cooling, and loose scale can reattach during subsequent rolling processes, causing operational inefficiencies and safety issues.
Innovation Solution
A cleaning device with a rotatably mounted nozzle holder and jet nozzle aligned at an angle to the surface, ensuring a constant angle between the direction of movement and the liquid jet, preventing scale reattachment and optimizing liquid usage and energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nozzle holder rotates with flat jet nozzles arranged on it, then the surface of the rolling stock is repeatedly swept over to loosen scale, but edge areas are more heavily exposed to liquid than central areas causing heat streaks and inhomogeneous cooling
Solution Approach 1:
The jet nozzle is made rotatable relative to the nozzle holder about an axis parallel to the central bearing axis. This dynamic adjustment allows the jet direction to be actively controlled and maintained at a constant angle to the rolling stock surface, compensating for the rotational movement of the nozzle holder and ensuring uniform liquid exposure across the entire surface.
Solution Approach 2:
The invention changes the parameter of jet orientation by allowing the jet nozzle to rotate independently. This enables the jet direction angle relative to the surface to be maintained constant despite the changing position of the nozzle holder, thereby achieving uniform cleaning across edge and central areas.
2Productivity
If scale is removed from the surface of the rolling stock, then scale loosening is achieved, but parts of the scale can be removed in the direction of movement and rolled back into the surface in subsequent rolling processes
Solution Approach 1:
The rotatable jet nozzle enables dynamic control of the jet direction vector. By adjusting the nozzle rotation, the liquid jet can be oriented to have no component in the direction of movement of the body, preventing loosened scale from being propelled forward and reattached during subsequent rolling operations.
Solution Approach 2:
The invention changes the directional parameters of the liquid jet by allowing independent rotation of the jet nozzle. This enables precise control of the jet vector components, ensuring that the jet removes scale effectively while preventing scale particles from being directed toward the rolling stock surface in the movement direction.
3Productivity
If liquid is used for descaling, then scale loosening is achieved, but the liquid itself remains on the rolling stock causing damping effect, cooling, and temperature differences
Solution Approach 1:
The rotatable jet nozzle provides dynamic control over liquid application. By optimizing the jet angle and direction, the liquid can be applied more efficiently for scale removal while reducing excessive liquid retention on the surface, thereby minimizing unwanted cooling effects and energy loss.
Solution Approach 2:
The invention optimizes the parameters of liquid jet application by enabling independent nozzle rotation. This allows adjustment of the jet direction to achieve effective scale removal while controlling liquid dwell time and distribution, reducing excessive cooling and thermal asymmetry.
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
This solution ensures uniform cleaning, reduces liquid and energy consumption, and prevents scale reattachment, improving operational efficiency and safety by maintaining consistent temperature and reducing thermal asymmetry.
Implementation Method 1
the at least one jet nozzle is rotatably mounted on the nozzle holder about an axis of rotation aligned parallel to the central bearing of the nozzle holder, with the jet nozzle being driven in rotation during operation in such a way that an angle between the direction of movement of the body and the orientation of the liquid jet emerging from the jet nozzle is in the level of the surface layer is constant
Implementation Method 2
a vector defining the jet direction of the liquid jet from the jet nozzle, which is under a pressure of 80 bar to 1000 bar
Data Source
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AI summary
A device for cleaning, in particular descaling, warm rolled material, especially slabs or strips, which is moved translationally relative to the device in a direction of movement, with a pressurized liquid, has at least one nozzle holder (3) rotatably mounted on a central bearing (5) located perpendicular or inclined to the surface of the rolled material to be treated, at least one jet nozzle held in an arm (31, 32) of the nozzle holder (3), from which the pressurized liquid emerges during operation, wherein the jet nozzle is oriented such that the surface of the rolled material is acted upon by a jet of liquid (12) emerging from the jet nozzle during operation in a linear and oblique manner relative to the surface of the rolled material, wherein the at least one jet nozzle is rotatably mounted on the nozzle holder (3) about an axis of rotation oriented parallel to the central bearing (5) of the nozzle holder (3), and wherein the jet nozzle is driven to rotate during operation.that an angle between the direction of movement of the rolled material and the orientation of the liquid jet (12) exiting the blast nozzle is constant in the plane of the rolled material surface, wherein a rotary axis with a supply line for the pressurized liquid is accommodated in the central bearing (5), which is connected to a supply line in the respective arm (31, 32) of the nozzle holder (3), which opens into an inlet opening of a nozzle housing of the blast nozzle, and that a vector defining the direction of jet of the liquid jet (12) under a pressure of 80 bar to 1000 bar from the blast nozzle has no component in the direction of movement of the body. Furthermore, a cleaning method is described.