Paving Machine Hopper Assembly Apron Alignment
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Solution Overview
Problem
The existing hopper assemblies in paving machines suffer from material wastage due to the angled connection between apron wing portions and hoppers, which creates a narrower outflow path and leads to accumulation of road forming materials, especially with adhesive properties, resulting in inefficient transfer to the conveyor system.
Innovation Solution
The hopper assembly design features apron wing portions pivotally connected in a manner where the first and second apron axes are substantially inline with the central axis in the lowered position, allowing for a planar translation during the transition from lowered to raised positions, preventing acute-angled corners and ensuring a uniform outflow path to the conveyor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the apron wing portions are pivotally connected at an angle relative to the hopper axis, then the hopper structure is compact and easier to manufacture, but the outflow path becomes narrower and material accumulates in acute-angled corner spots
Solution Approach 1:
The patent applies asymmetry by positioning the apron wing portions in a symmetric arrangement relative to the central axis, but each wing is asymmetrically oriented at an angle to the hopper axis. This creates the acute-angled corner spots that cause material accumulation. The invention resolves this by transitioning to a configuration where the apron wings are substantially inline with the central axis, eliminating the asymmetric angular offset that created the problem.
Solution Approach 2:
The patent addresses the acute-angled corner spots (sharp geometric features) by reconfiguring the apron wing positioning to create a more continuous, curved flow path. By making the apron wings substantially inline with the central axis rather than angled, the design eliminates sharp corners and creates a smoother, more continuous surface that prevents material accumulation.
2Productivity
If the apron wing portions are positioned inline with the central axis, then the outflow path is wider and material transfer is more complete, but the hopper assembly becomes more complex
Solution Approach 1:
The patent applies merging by aligning the apron wing portions with the central axis, effectively merging their orientations into a unified linear arrangement. This consolidation of the apron wings along the central axis creates a wider, more continuous outflow path that improves material transfer efficiency, while the modular pivotable design maintains manufacturing simplicity.
Solution Approach 2:
The patent employs dynamics by making the apron wing portions pivotably connected to the hoppers, allowing them to transition between different positions. This dynamic capability enables the apron wings to be positioned inline with the central axis during material transfer to maximize efficiency, while potentially allowing alternative configurations during other operational phases, thus resolving the complexity concern.
3Ease of operation
If the apron wing portions are angled relative to the hopper axis, then the hopper assembly is easier to operate in lowered position, but material accumulates and adheres in the acute-angled corners
Solution Approach 1:
The patent applies preliminary action by pre-positioning the apron wing portions in a configuration that is optimized for material flow (inline with central axis) before material transfer begins. The pivotable connection allows the apron wings to be preliminarily adjusted to the optimal position, preventing material accumulation before it occurs, rather than requiring corrective action after accumulation has started.
Solution Approach 2:
The patent applies parameter changes by modifying the angular parameter of the apron wing positioning. Instead of maintaining a fixed angle relative to the hopper axis, the system changes the angular parameter to align the apron wings substantially inline with the central axis. This parameter change eliminates the acute-angled corners that cause material adhesion, ensuring consistent material flow while maintaining ease of operation through the pivotable mechanism.
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 configuration ensures that road forming materials are substantially entirely and uniformly delivered to the conveyor, reducing wastage and accumulation, thereby enhancing the efficiency of material transfer and reducing material loss during the paving process.
Implementation Method 1
in the raised position the twin hopper set facilitate transfer of the road forming material to the conveyor portion by gravity feed
Data Source
AI summary
A paving machine includes a hopper assembly movable between a lowered position and a raised position and a conveyor frame. A first hopper is pivotally connected to the conveyor frame at a first hopper axis and a second hopper is pivotally connected to the conveyor frame at a second hopper axis. A first apron is connected to the first hopper about a first apron axis. A second apron is connected to the second hopper about a second apron axis. The first apron axis and the second apron axis are respectively perpendicular to the first and second hopper axis. A central apron is pivotally connected relative to the conveyor frame about a central axis that is inline to the first and second apron axis in the lowered position. The first and the second apron axis are planarly translated to the central axis from the lowered to the raised position.