Marking Machine Nozzle Pressure Control for Constant Line Width
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Solution Overview
Problem
Conventional marking machines experience variable marking line widths due to changes in marking speed, leading to impermissible line width changes and the need to limit maximum speed, resulting in a slower and less economical marking process.
Innovation Solution
The method involves controlling the position of the spray nozzle relative to the surface using spray pressure or a pressure-dependent fluid to maintain a constant marking line width, achieved by adjusting the distance or rotational position of the nozzle, and utilizing a piston-cylinder unit with a variable restoring force to counteract changes in spray pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the paint flow in the spray nozzle is regulated proportionally to the marking speed, then the amount of paint applied to the running line meter is kept constant, but changes in speed result in changes in pressure and thus spray width and marking line width
Solution Approach 1:
The patent implements a feedback control system where the actual spray pressure is continuously measured and used to adjust the paint flow rate. The control unit receives pressure signals from the spray nozzle, compares them with reference values, and dynamically regulates the paint flow to compensate for pressure variations, thereby maintaining constant marking line width despite speed changes.
Solution Approach 2:
The patent dynamically changes the paint flow rate parameter in response to measured spray pressure variations. By adjusting the paint flow parameter based on real-time pressure feedback, the system compensates for pressure-induced width variations and maintains consistent marking line width across different operating speeds.
2Manufacturing precision
If the maximum marking speed is limited to avoid impermissible line width changes, then the marking line width remains within acceptable tolerances, but the marking operation becomes slower and less economical
Solution Approach 1:
The feedback control system enables the marking machine to operate at higher speeds by continuously monitoring spray pressure and dynamically adjusting paint flow rate to compensate for speed-induced pressure variations. This eliminates the need for speed limitation while maintaining marking line width within acceptable tolerances.
Solution Approach 2:
The patent replaces the mechanical speed limitation approach with an electronic control system that uses sensors and actuators to dynamically adjust paint flow rate. This substitution of mechanical constraints with electronic feedback control enables higher operating speeds while maintaining marking precision.
3Productivity
If the spray pressure increases with marking speed, then the paint application rate increases, but the spray width increases and marking line width becomes non-constant
Solution Approach 1:
The feedback control system measures the actual spray pressure that increases with marking speed and uses this information to dynamically reduce the paint flow rate proportionally. This compensatory adjustment maintains constant marking line width even at higher speeds where spray pressure naturally increases.
Solution Approach 2:
The patent dynamically changes the paint flow rate parameter in inverse proportion to the measured spray pressure variations. When spray pressure increases due to higher marking speed, the system reduces paint flow rate to compensate, thereby maintaining constant marking line width across the full operating speed range.
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 approach allows for the production of marking lines with consistent width at varying speeds, enhancing operational efficiency and economy by maintaining line width stability regardless of marking speed.
Implementation Method 1
the spray pressure or a pressure of another fluid which is dependent on the spray pressure is used to control the position of the spray nozzle
Data Source
Figure 1~2
AI summary
The method involves injecting marking line color e.g. yellow, on a surface (14) to be marked using an injection nozzle (6) of a marking machine (1), where the line color is under injection pressure. Position of the nozzle is controlled based on marked surface with the help of injection pressure of fluid, and marking line width is controlled by keeping the injection pressure at constant level. Distance (A) of the nozzle on the marked surface is controlled, and rotational position of the nozzle is controlled around vertical axis relative to the marked surface. An independent claim is also included for a marking machine comprising an injection nozzle.