Road Milling Machine Sealing Element Obstacle Avoidance
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Solution Overview
Problem
Existing road milling machines face issues with sealing elements hitting obstacles due to uneven terrain, as current control systems cannot effectively react to horizontal force components, leading to potential blockages and increased wear.
Innovation Solution
A self-propelled construction machine equipped with front and rear sealing elements that utilize a measuring unit and control unit to detect and respond to horizontal force components, automatically raising the sealing elements when a predetermined limit value is exceeded, ensuring safe operation and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing element is pressed onto the ground with a predetermined contact force, then the sealing element maintains effective contact with the ground for sealing purposes, but the sealing element cannot react to horizontal force components from obstacles and remains blocked
Solution Approach 1:
The control system continuously monitors the contact force between the sealing element and the ground via the measuring unit. When the measured force exceeds the predetermined limit value (indicating obstacle contact), the control unit automatically activates the raising device to lift the sealing element, preventing blockage. This closed-loop feedback mechanism enables the sealing element to adapt to obstacles while maintaining effective sealing contact during normal operation.
2Productivity
If the sealing element is raised when hitting an obstacle, then the sealing element avoids blockages and continues operation, but the sealing element cannot maintain constant contact force with the ground
Solution Approach 1:
The system dynamically adjusts the sealing element's position based on real-time conditions. During normal operation, the sealing element maintains constant contact force with the ground. When an obstacle is detected (force exceeds limit value), the system automatically raises the sealing element to avoid blockage. After passing the obstacle, the sealing element returns to its normal contact position. This dynamic adjustment ensures continuous operation while maintaining sealing effectiveness.
3Adaptability or versatility
If a measuring unit and control unit are added to detect and respond to horizontal force components, then the sealing element can automatically react to obstacles, but the device complexity increases
Solution Approach 1:
The measuring unit serves multiple functions: it monitors the contact force between the sealing element and ground, detects obstacle presence by measuring horizontal force components, and provides feedback to the control unit for automatic adjustment. This multi-functional design reduces the need for separate detection systems, thereby limiting the increase in device complexity while achieving obstacle detection and automatic response capabilities.
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 solution prevents blockages by automatically adjusting the sealing elements to overcome obstacles, improving machine stability, maintaining constant advance, and reducing wear, while allowing for operator control over the sealing element's operation.
Implementation Method 1
the road milling machine has a device for raising and lowering the sealing element, which has a piston and cylinder arrangement with which the sealing element can be raised or lowered
Implementation Method 2
the vertical force component acting on the sealing element is recorded with a measuring unit that measures the hydraulic pressure in the cylinder
Data Source
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AI summary
The invention relates to a self-propelled construction machine, in particular a road milling machine, recycler, or stabilizer, with a work roller 5 and a roller housing 7B enclosing the work roller, which is closed by a sealing element 7A located at the front and/or rear in the working direction and/or by a sealing element 7A located on the side. The construction machine has a device for raising and lowering the sealing element, which holds the sealing element pressed against the ground with a predetermined bearing force. The device for raising and lowering has a measuring unit 26, which is designed such that the measuring unit measures the force acting on the sealing element when it encounters an obstacle.Furthermore, the lifting and lowering device has a control unit designed such that the control unit generates a control signal to lift the sealing element when the force measured by the measuring unit is greater than a predetermined limit value, so that the sealing element is lifted.