Road Milling Dust Extraction Control for Vacuum Effect Reduction
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Solution Overview
Problem
Existing ground milling machines suffer from suboptimal dust extraction methods that lead to excessive suction, causing inefficiencies in filter devices and increased dust inhalation due to the vacuum effect, especially under varying operating conditions.
Innovation Solution
A control device is integrated into the dust extraction system to adjust the extraction power dynamically, allowing the system to operate at varying power stages or ranges based on real-time machine configurations and dust emission levels, using sensors to monitor and regulate suction power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high extraction power is used to ensure sufficient dust extraction under all operating conditions, then dust extraction reliability is improved, but energy consumption increases and filter devices become less efficient
Solution Approach 1:
The extraction power of the dust extraction device is made dynamically adjustable through a control device that can vary the extraction power between at least two different power stages or within a power range, allowing the system to adapt to different operating conditions rather than operating at constant high power
Solution Approach 2:
The extraction power parameter is changed based on detected operating conditions, with the control device regulating the extraction power to be just sufficient for the current milling depth, side shield position, and other machine settings, avoiding unnecessary high power operation
2Productivity
If high suction power is used to extract dust-laden air, then dust extraction efficiency is improved, but the vacuum effect increases causing excessive dust inhalation
Solution Approach 1:
A sensor device detects operating conditions and provides feedback to the control device, which then regulates the extraction power to be just sufficient for the detected conditions, preventing excessive suction that would cause harmful vacuum effects and dust inhalation
Solution Approach 2:
Instead of applying full extraction power continuously, the system applies only the partial extraction power necessary for the current operating conditions, avoiding excessive action that would create harmful vacuum effects
3Device complexity
If fixed extraction power is used to simplify the system, then device complexity is reduced, but adaptability to different operating conditions deteriorates
Solution Approach 1:
A sensor device and control device form a feedback system that automatically detects operating conditions and regulates extraction power accordingly, providing adaptability without requiring complex manual adjustments by the operator
Solution Approach 2:
The dust extraction device automatically adjusts its own extraction power based on detected operating conditions, with the control device regulating power based on machine settings such as milling depth and side shield position, making the system self-adapting
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 system effectively adapts to different operating conditions, optimizing dust extraction efficiency while minimizing the vacuum effect and reducing unnecessary suction, thus enhancing operator safety and extending filter life.
Implementation Method 1
The extraction fan, which has a suction side and a discharge side, thus generates a negative pressure on the suction side and ultimately an air suction in the extraction duct
Data Source
AI summary
A ground milling machine, in particular a road milling machine, recycler or stabilizer, for working a ground in or against a working direction, comprising a machine frame supported by travel units and having a drive motor, a milling drum rotatably mounted in a milling drum box arranged on the machine frame for removing ground material, and an extraction device for extracting dust-laden air from the milling drum box and/or a region of a conveying duct of the milled material, comprising an extraction fan and at least one extraction duct extending from the milling drum box to the extraction fan. A method for operating a dust extraction device of a ground milling machine.