Slipform Paver Frame Orientation via Front Lifting Adjustment
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Solution Overview
Problem
Existing construction machines, such as slipform pavers and road milling machines, face challenges in maintaining optimal working results on uneven ground surfaces without using stringlines, which are time-consuming and obstructive. Current methods either copy ground unevenness into the building structure or require complex calibration and obstruction on the construction site.
Innovation Solution
The machine features a control unit that adjusts the machine frame's orientation relative to the ground surface by extending or retracting the front lifting system to compensate for ground irregularities, ensuring the machine frame remains parallel to an ideal surface, with the rear lifting system following the front's adjustments to maintain consistent height and orientation, thus avoiding the need for stringlines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the concrete mold is kept at a constant distance from the ground surface, then the operation is simple and economical, but the ground unevenness is copied into the building structure
Solution Approach 1:
The system performs preliminary scanning of the ground surface ahead of the concrete mold using sensors. The control unit processes this advance information about ground unevenness and pre-adjusts the lifting system to compensate for upcoming variations, preventing the mold from following the ground profile and avoiding copying unevenness into the building structure.
Solution Approach 2:
The system continuously scans the ground surface with sensors and feeds this information back to the control unit, which automatically adjusts the lifting system in real-time. This closed-loop feedback mechanism maintains a constant distance between the mold and the ideal ground surface, eliminating ground unevenness from the building structure while keeping the operation simple.
2Manufacturing precision
If stringlines are used to compensate for ground irregularities, then the building structure height consistency is improved, but the device complexity and operational obstruction increase
Solution Approach 1:
The system replaces the mechanical stringline reference system with an electronic sensor-based ground scanning and control system. Sensors detect ground unevenness, and the control unit automatically adjusts the lifting system, eliminating the need for physical stringlines while achieving the same height consistency goal with reduced complexity and no operational obstruction.
Solution Approach 2:
The control unit acts as an intermediary between the sensor data and the lifting system adjustment. It processes the scanned ground surface information and generates appropriate control signals to adjust the lifting system, replacing the need for physical stringlines and manual intervention while maintaining building structure height consistency.
3Manufacturing precision
If the machine frame is adjusted to remain parallel to the ground surface, then the orientation accuracy is improved, but the time for height correction increases
Solution Approach 1:
The system scans the ground surface ahead of the machine frame and performs preliminary calculations for the required height corrections. By preparing the correction data in advance based on upcoming ground variations, the system can execute adjustments quickly and continuously maintain parallel orientation without time-consuming corrections during operation.
Solution Approach 2:
The ground scanning and height adjustment operations are performed continuously as the machine moves forward. The sensors continuously monitor the ground surface, and the control unit continuously adjusts the lifting system, maintaining parallel orientation of the machine frame without interruption or time loss, as the useful action of scanning and adjusting occurs simultaneously with machine advancement.
Data Source
AI summary
An automotive construction machine, in particular a slipform paver or a road milling machine, has at least one front running gear and one rear running gear in the working direction. As the construction machine advances, the lifting systems of the front running gear are extended or retracted such that the machine frame remains in a predetermined orientation to the surface of the ground in the longitudinal direction. Irregularities in the ground surface are detected as the construction machine advances, and the position of the front lifting systems, predetermined by the control or regulating unit, is monitored to keep the machine frame in a predetermined orientation to the ground surface. As the construction machine advances, the control of the rear lifting systems is engaged with a time delay subject to the control of the front lifting systems. Consequently, the working system of the construction machine, in particular the concrete mold or milling drum, is adjusted to the correct height with respect to the ground surface, so that the working system does not copy the course of the ground.