Milling Drum Depth Control for Uneven Road Surface Leveling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing milling machines fail to effectively level out unevennesses in traffic areas during road pavement removal, as they maintain a constant milling depth independent of the machine's position, leading to the reproduction of existing surface irregularities on the new pavement.
Innovation Solution
A method and device that utilize target and actual profile data in a stationary coordinate system to control the milling depth of a milling drum, allowing for the updating and storage of milling depth values based on the current position and desired milling depth, enabling repeated milling of partially worked areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant target value for milling depth is maintained independent of machine position, then the control system is simple to operate, but the existing surface unevennesses are reproduced on the new pavement surface
Solution Approach 1:
The milling depth control system transitions from a static constant target value to a dynamic position-dependent target value. The control system continuously adjusts the milling depth based on the machine's current position coordinates (x, y) and the stored target profile data Ft(x, y), enabling the system to adapt to varying surface conditions throughout the work area while maintaining operational simplicity through automated control.
Solution Approach 2:
The system implements feedback by continuously measuring the actual milling depth Ft' at the current position, comparing it with the position-specific target value Ft(x, y) from the stored profile data, and automatically adjusting the milling depth to eliminate deviations. This closed-loop control ensures precise surface evenness while maintaining ease of operation through automated correction.
2Manufacturing precision
If the milling depth is constantly adjusted based on position, then surface unevennesses can be leveled out, but the control system complexity increases
Solution Approach 1:
The target profile data Ft(x, y) representing the desired final surface configuration is pre-calculated and stored in the control system's memory before the milling operation begins. This preliminary preparation allows the control system to simply retrieve and follow the predetermined profile during operation, achieving precise surface evenness without requiring complex real-time calculations or adjustments.
Solution Approach 2:
The system replaces complex mechanical depth adjustment mechanisms with an electronic control system that uses stored profile data and position information to automatically control milling depth. The computer-based control system substitutes for manual operation and complex mechanical feedback mechanisms, reducing overall system complexity while maintaining high manufacturing precision.
3Adaptability or versatility
If the target profile data is updated in real-time during milling, then repeated milling of partially worked areas is enabled, but the data processing load increases
Solution Approach 1:
The control system automatically updates the target profile data Ft(x, y) in real-time as the milling operation progresses. When the milling machine revisits previously worked areas, the system self-adjusts by comparing current actual depth measurements with stored profile data and automatically modifying the target values to reflect the updated surface condition, enabling repeated milling without manual intervention or complex external processing systems.
Data Source
AI summary
In the method for milling off traffic areas with a milling drum of a milling machine, the following steps are provided:obtaining and storing target profile data (x, y, Ft(x,y)) of a desired target profile (8) of a surface of the traffic area (3) in target condition, wherein target values (Ft(x,y)) for a locally desired milling depth (Ft), which are specified relative to the surface of the traffic area (2) to be worked, are assigned to position data (x, y) in an in particular stationary coordinate system independent of the milling machine (6),determining the current x, y position of the milling drum (4) in the coordinate system and detecting the milling depth (Ft′) of the milling drum (4) currently adjusted relative to the surface of the traffic area (2, 3),during the milling operation, controlling the milling depth (Ft) of the milling drum (4) as a function of the target value (Ft(x,y)) for the locally desired milling depth (Ft) assigned to the current x, y position of the milling drum (4) and the currently detected milling depth (Ft′),updating the target profile data (x, y, Ft(x,y)) in the current position (x, y) of the milling drum (4) on the worked traffic area (3) by the currently actually milled milling depth (Ft), andstoring the updated target profile data (x, y, Ft(x,y)).