Road construction machine with nebulizer
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Solution Overview
Problem
Operators of road construction machines, such as road finishers and feeder vehicles, are exposed to high temperatures while working with hot asphalt, especially in summer or in hot regions, as they lack effective cooling systems within enclosed cabins.
Innovation Solution
A cooling system is integrated into the road construction machine, comprising a tank for a cooling agent and a spray apparatus that nebulizes the agent into a mist, positioned above the operator stand to provide evaporative cooling, thereby reducing the operator's exposure to heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the spray apparatus is positioned at ground level to bind aerosols, then the operator is protected from rising aerosols, but the operator's view is obstructed and the cooling effect on the operator is insufficient
Solution Approach 1:
The spray apparatus is positioned at height above ground level (specifically on the operator stand structure), transitioning from ground-level spraying to elevated spraying. This dimensional change allows the mist to be generated above the operator's head, protecting the view while still binding aerosols through downward drift and evaporative cooling of the operator.
2Object-affected harmful factors
If the spray apparatus is positioned close to the ground to bind aerosols, then aerosol binding is effective, but the cooling effect on the operator is insufficient and the operator's view is obstructed
Solution Approach 1:
The spray apparatus is elevated to spray above the operator's head rather than at ground level. This positional change enables the mist to provide direct evaporative cooling to the operator's body and head while maintaining aerosol binding capability through atmospheric mixing and downward drift.
Solution Approach 2:
The mist generation is localized to the operator stand area at elevated height, creating a concentrated cooling zone around the operator. This localized approach ensures effective cooling where needed (at operator level) while maintaining aerosol binding in the broader area.
3Temperature
If the spray apparatus is positioned at high height to cool the operator, then evaporative cooling is effective, but the mist may be too diluted to bind particles effectively
Solution Approach 1:
The spray apparatus uses adjustable spray patterns and droplet sizes to dynamically control mist distribution. By optimizing droplet characteristics and spray direction, the system maintains adequate mist concentration at height for both cooling and particle binding, preventing excessive dilution while covering the necessary area.
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 cooling system effectively reduces the operator's discomfort and fatigue by providing evaporative cooling, improving concentration, and enhancing visibility without obstructing the operator's view, while also binding particles like dust.
Implementation Method 1
The mist ensures that the surroundings are cooled by evaporative cooling (adiabatic cooling).
Implementation Method 2
The mist ensures that the surroundings are cooled by evaporative cooling (adiabatic cooling).
Implementation Method 3
the mist binds particles such as dust
Implementation Method 4
the mist binds particles such as dust
Data Source
AI summary
A road construction machine in the form of a road finisher or feeder vehicle comprising an operator stand with a floor surface as a tread surface and a cooling system for producing a mist from a cooling agent. The cooling system comprises a tank for receiving the cooling agent and a spray apparatus for nebulizing the cooling agent into a mist. The cooling system is configured to produce the mist in the area of the operator stand, and the spray apparatus is arranged thereby at a height of at least 1.7 m above the tread surface.