Movable Sensor for Milling Drum Wear Measurement
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Solution Overview
Problem
Existing ground milling machines face challenges in accurately and objectively assessing wear on chiseling devices due to subjective visual inspections and inaccuracies in sensor-based methods, particularly with wide milling drums where varying angles and positions lead to inconsistent wear measurements.
Innovation Solution
A sensor device that can be moved along the milling drum width and rotated to establish identical measurement angles and positions relative to each chiseling device, ensuring precise and comparable wear determination by adjusting the sensor's position and angle to match the chiseling device's location, using a guide means like a linear guide rail or spindle drive for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed sensor is used to detect all chiseling devices over the entire milling drum width, then the system production cost is reduced, but the measurement precision deteriorates due to varying angles and positions
Solution Approach 1:
The sensor device is made movable along the milling drum width instead of being fixed, allowing it to dynamically adjust its position to maintain a constant measurement angle relative to each chiseling device. This dynamic positioning resolves the contradiction by enabling accurate measurements across the entire drum width without requiring multiple fixed sensors, thus controlling system cost while improving measurement precision.
2Measurement precision
If several sensors are used to cover the entire milling drum width, then the measurement precision is improved, but the device complexity and production cost increase
Solution Approach 1:
Instead of using multiple fixed sensors simultaneously, the invention employs a single sensor that moves dynamically along the milling drum width. This approach maintains measurement precision comparable to multiple sensors while significantly reducing device complexity and production cost by eliminating the need for multiple sensor units and their associated mounting structures.
Solution Approach 2:
A single sensor device is designed to perform the function of multiple sensors by moving to different positions along the milling drum width. This universal sensor can measure wear on any chiseling device across the entire drum width, replacing the need for multiple specialized sensors and simplifying the overall system.
3Device complexity
If visual inspection is used to determine wear, then the device complexity is reduced, but the measurement precision and objectivity deteriorate
Solution Approach 1:
The invention replaces the subjective mechanical visual inspection process with an automated sensor-based measurement system. The sensor objectively measures wear parameters such as chisel length and geometry, eliminating human subjectivity and improving measurement precision while maintaining relatively simple device complexity through the use of a single movable sensor unit.
Data Source
AI summary
The present invention relates to a ground milling machine, in particular a road milling machine, a recycler, a stabilizer or a surface miner, comprising a milling drum with a milling drum width (a) extending along its rotational axis and with at least two chiseling devices, each of which comprises a chisel and a chisel holder, and a sensor device for determining wear on the at least two chiseling devices in a contactless manner, said sensor device comprising a sensor for measuring a wear parameter of the at least two chiseling devices, the sensor being movable at least over a part of the milling drum width (a) in order to set an identical measurement angle (α) and an identical position of the sensor relative to the at least two chiseling devices in order to measure the wear parameter of the at least two chiseling devices. The present invention further relates to a method for determining wear on the at least two chiseling devices of the ground milling machine in a contactless manner.