Soil Milling Machine Cross-Slope Control via Inclination Sensor
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Solution Overview
Problem
Existing soil milling machines struggle to achieve precise soil processing without requiring additional information about the cross slope of the soil surface, especially when a suitable reference surface is not available on one side of the path to be processed, and they fail to maintain the same cross slope during milling when the road surface changes along its length.
Innovation Solution
The soil milling machine employs a chassis with front and rear tracks that are positively coupled or connected via a pendulum axle system, equipped with lifting devices and sensors to measure distance and cross-slope, allowing the control unit to adjust the milling depth and cross slope dynamically based on real-time data without prior surveying, ensuring the milling drum remains parallel to the ground surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional distance measurement methods are used on both sides of the milling drum, then milling depth can be controlled, but the method becomes infeasible when a suitable reference surface is not available on one side (e.g., roadside ditch or embankment)
Solution Approach 1:
The patent introduces an intermediary solution by using the machine frame's own inclination (measured by inclination sensor) as a substitute for the missing external reference surface. Instead of requiring a reference surface on both sides, the system uses the measured inclination of the machine frame relative to horizontal, combined with distance measurement on the available side, to calculate and control the milling depth on both sides of the milling drum.
2Manufacturing precision
If the cross slope of the road surface changes along its length, then the milling drum must be continuously repositioned to maintain parallel alignment, but traditional methods require prior surveying and marking of the path
Solution Approach 1:
The patent implements a feedback control system where the inclination sensor continuously measures the actual inclination of the machine frame, and the control unit uses this real-time data to adjust the lifting devices and maintain the desired cross slope. This eliminates the need for prior surveying and marking, as the system automatically adapts to changing road profiles through continuous measurement and adjustment.
Solution Approach 2:
The patent replaces the traditional mechanical surveying and marking process with an electronic sensing and control system. Instead of physically marking the path beforehand, the system uses an inclination sensor to detect the machine frame's orientation and a control unit to automatically adjust the milling depth, substituting manual mechanical procedures with automated electronic control.
3Device complexity
If the milling drum is kept at a fixed inclination, then the machine structure is simple, but the milling depth varies when the cross slope of the ground changes
Solution Approach 1:
The patent transforms the static, fixed inclination system into a dynamic, adjustable system. The lifting devices are controlled to actively adjust the inclination of the milling drum based on real-time feedback from the inclination sensor and distance measurement, allowing the system to adapt to changing ground conditions while maintaining consistent milling depth.
Data Source
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Figure 3A~3B
AI summary
The invention relates to a self-propelled soil milling machine 1, which comprises a machine frame 3 supported by a chassis 2 having front and rear, left and right tracks 4, 5, 6, 7, wherein a milling drum 10 is arranged on the machine frame 3. Furthermore, the invention relates to a method for controlling such a soil milling machine. The soil milling machine according to the invention is characterized by a cross-slope detection device 21, which is designed for controlling the soil milling machine such that the position of the front left and right tracks 4, 5, which stand on the unworked soil 8, is detected with respect to the machine frame 3, and cross-slope values describing the cross-slope of the soil surface transverse to the working direction A of the soil milling machine with respect to the machine frame are determined from the position of these tracks, and these values form the basis for controlling the soil milling machine.The cross slope detection device 21 functions as a cross slope sensor system for detecting the cross slope of the track.