Milling Machine Conveyor Trajectory Control for Rear Loading
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Solution Overview
Problem
Operators of self-propelled milling machines face distraction and increased stress due to the need to control the slewing angle, elevation angle, and conveying speed of the transport conveyor, especially when coordinating with a rear-loading transport vehicle that must travel behind the milling machine, which complicates the milling process and loading operation.
Innovation Solution
A control system that automatically adjusts the slewing angle of the transport conveyor using open-loop or closed-loop control, ensuring the discharge end or point of impact of the milling material remains on a specified trajectory within a stationary coordinate system, independent of the machine's position and alignment, allowing the operator to focus on the milling operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator manually controls the slewing angle, elevation angle, and conveying speed of the transport conveyor, then the loading process can be adjusted to match machine position changes, but the operator becomes distracted from the milling operation and experiences increased stress
Solution Approach 1:
The control system automatically adjusts the slewing angle and conveying speed based on the machine's position and trajectory, enabling the transport conveyor to self-regulate without operator intervention. This resolves the contradiction by making the system self-servicing while maintaining proper loading coordination.
Solution Approach 2:
The control system continuously monitors the machine position, trajectory, and transport conveyor status, then automatically adjusts the slewing angle and conveying speed in response to detected deviations. This feedback mechanism enables automatic adaptation to position changes without operator distraction.
2Productivity
If the transport conveyor is made longer to improve material discharge distance, then the loading capability is enhanced, but the device complexity and coordination difficulty increase
Solution Approach 1:
The transport conveyor is designed with dynamic adjustment capabilities, allowing the slewing angle and conveying speed to be automatically modified based on real-time position data. This enables a single conveyor of moderate length to perform the function of a longer conveyor through dynamic trajectory adaptation.
Solution Approach 2:
The control system dynamically changes operational parameters (slewing angle, conveying speed) in response to machine position and trajectory variations. This parameter adaptation allows the transport conveyor to maintain optimal loading performance without requiring increased physical length or structural complexity.
Data Source
AI summary
In a self-propelled construction machine comprising a machine frame with a longitudinal axis, a controller for the travelling and milling operation, a height-adjustable working drum, and a slewable transport conveyor: that the control system, at least as a function of a virtual trajectory for positioning the transport conveyor which is freely specifiable in a stationary coordinate system that is independent of the position and alignment of the machine frame, controls, by means of open-loop control or closed-loop control, at least the slewing angle of the transport conveyor automatically in such a fashion that a reference point of the transport conveyor always remains on the specified trajectory in the case of a change in position of the machine frame within the coordinate system.