Slipform Paving Machine Height Adjustment via Segmented Actuation
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Solution Overview
Problem
Existing slipform paving machines with large variable height offset molds face challenges in adjusting mold height beyond the leg stroke of lifting columns, requiring manual repositioning and compromising stability, which is inefficient and labor-intensive.
Innovation Solution
The implementation of a slipform paving machine with height adjustable machine frame supports and a mold frame actuator, controlled by a controller that receives signals from external reference sensors to adjust the machine frame and mold frame height, allowing for automatic changes in mold height and side profile adjustments, utilizing hydraulic piston-cylinder units and sensors for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the leg stroke of lifting columns is used to adjust mold height, then mold height can be increased, but the paving machine becomes unstable when legs are extended to maximum height
Solution Approach 1:
The height adjustment function is divided into two independent segments: the lifting columns support the machine frame at a fixed height, while the mold frame actuator independently adjusts the mold frame height relative to the machine frame. This segmentation allows height adjustment without compromising machine stability.
Solution Approach 2:
The system transitions from a static fixed-height mold configuration to a dynamic adjustable-height mold configuration through the mold frame actuator, which enables continuous height adjustment while the machine frame remains stable on the ground.
2Length of moving object
If manual repositioning of the mold is performed when maximum leg stroke is reached, then mold height can be increased beyond leg stroke limits, but the operation requires significant manual labor and time
Solution Approach 1:
The mold frame actuator enables the mold frame to self-adjust its height automatically in response to control signals from the controller, eliminating the need for manual intervention. The system monitors the desired height and autonomously positions the mold frame to achieve the target height.
Solution Approach 2:
The manual mechanical repositioning operation is replaced by an automated hydraulic actuator system controlled by electronic signals from the controller, transforming a labor-intensive mechanical task into an automated control process.
3Length of moving object
If the position of the mold relative to the machine frame is changed manually, then mold height can be adjusted, but the position of the feeding auger or belt relative to the machine frame must also be changed
Solution Approach 1:
The mold frame actuator serves multiple functions: it adjusts the mold frame height, maintains the correct relative position between the mold frame and feeding auger/belt, and ensures proper alignment of the concrete barrier profile. This single actuator coordinates all necessary positional adjustments.
Solution Approach 2:
The controller receives feedback about the mold frame position and the feeding auger/belt position, and uses this information to coordinate their movements. The system monitors and adjusts both components to maintain proper relative positioning throughout the height adjustment process.
4Stability of the object's composition
If only a portion of the leg stroke is used to maintain stability, then paving machine stability is preserved, but further stages of unbolting and reattaching the mold are required
Solution Approach 1:
The height adjustment function is separated into two independent systems: the lifting columns that maintain machine frame stability, and the mold frame actuator that adjusts mold frame height. This eliminates the need for multiple unbolting and reattaching stages.
Solution Approach 2:
The mold frame actuator enables continuous height adjustment during the paving operation without interruption. The mold frame can be adjusted to any height within the actuator's range while the paving operation continues uninterrupted, eliminating the need to stop for repositioning.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A slipform paving machine includes an offset mold 22, and a mold frame actuator 56 which allows the height of the offset mold relative to the paving machine to be controlled. Internal actuators 84, 88 within the mold allow corresponding control of side form assemblies 70, 72 to control both height and profile of a resulting slipformed concrete structure.