Road Milling Machine Weight Force Control for Tipping Stability
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Solution Overview
Problem
Road milling machines face challenges in achieving uniform operating results and ensuring adequate tipping resistance, especially on uneven ground, due to their high center of gravity, which increases the risk of tipping over when encountering obstructions or ground unevenness.
Innovation Solution
A weight force measuring device is integrated with the actuators of the transportation means, allowing for continuous monitoring and control of weight distribution, enabling the control device to adjust the lifting columns independently to maintain a stable position and prevent tilting by adjusting the weight force values to a setpoint value, thereby stabilizing the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the construction machine operates on uneven ground, then the milling operation can be performed in more terrain conditions, but the tipping resistance decreases due to high center of gravity
Solution Approach 1:
The control device continuously monitors weight force values from measuring devices on the transportation means and automatically adjusts the lifting columns to maintain stable weight distribution. This closed-loop feedback system prevents tipping by detecting weight imbalances and correcting them in real-time, enabling safe operation on uneven ground while maintaining tipping resistance.
Solution Approach 2:
The system dynamically adjusts the height of transportation means relative to the ground based on real-time weight measurements. The lifting columns can independently extend or retract to compensate for ground unevenness, allowing the machine to adapt its configuration to maintain stability on varying terrain while preserving tipping resistance.
2Adaptability or versatility
If the machine frame is adjusted to various vertical positions, then the milling depth and positioning flexibility improve, but the weight distribution becomes unstable on uneven ground
Solution Approach 1:
The control device uses weight force measurements to continuously monitor weight distribution stability and automatically adjusts the lifting columns to restore optimal weight distribution after any vertical positioning change. This feedback mechanism ensures that milling depth adjustments do not compromise stability on uneven ground.
Solution Approach 2:
Before performing vertical positioning adjustments for milling operations, the system can pre-assess the ground conditions and weight distribution. The control device prepares the lifting columns to compensate for anticipated instability, ensuring that vertical adjustments maintain weight distribution stability even on uneven terrain.
3Measurement precision
If weight force measuring devices are allocated to each actuator, then the control precision of weight distribution improves, but the device complexity increases
Solution Approach 1:
The control device serves multiple functions: it controls the lifting columns for vertical positioning, monitors weight force values from measuring devices, calculates optimal weight distribution, and adjusts actuator positions to maintain stability. By consolidating these functions into a single control unit, the system achieves high measurement precision without proportionally increasing overall device complexity.
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
This solution enhances the tipping stability of road milling machines by ensuring optimal weight distribution and leveling, reducing the risk of tilting on uneven ground and over obstructions, without the need for hydraulic coupling, through electronic independent activation of actuators.
Implementation Method 1
a weight force measuring device allocated to at least one actuator 10 of a pair of front or rear transportation means 5, wherein the weight force measuring device 19 is designed to ascertain a value of a weight force F applied to the at least one actuator 10
Data Source
AI summary
The present invention relates to a construction machine, in particular a ground milling machine, comprising transportation means connected to the machine frame via lifting columns. The lift adjustment of the lifting columns occurs as a function of the determined weight force values respectively applied to at least one actuator of a pair of front and/or rear and/or right and/or left transportation means. The present invention further relates to a method of optimum and practical weight distribution of the machine weight to the transportation devices for such a construction machine.