Triple Hopper Silo Discharge System for Asphalt Segregation
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Solution Overview
Problem
Storage silos for hot asphaltic mix face issues such as segregation of aggregates, tunneling, and oxidation, leading to non-uniform material discharge and quality problems, particularly with single outlet systems that require complex truck movements to mitigate segregation.
Innovation Solution
A silo design featuring at least three inverted, four-sided frustum hoppers with rectilinear discharge openings and movable gates, including clam-type gates and a sealing system using water to prevent oxidation, allows for simultaneous and uniform discharge into a truck bed without requiring truck movement, enhancing loading efficiency and preventing segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single discharge outlet is used in the silo, then the device complexity is reduced, but segregation of aggregates and tunneling occur leading to non-uniform material discharge
Solution Approach 1:
The single discharge outlet is segmented into multiple discharge outlets (at least three) positioned at different locations within the silo. Each outlet has its own gate mechanism, allowing independent control of material flow from different zones of the silo, thereby preventing segregation and tunneling while maintaining uniform discharge
Solution Approach 2:
The discharge outlets are arranged in a three-dimensional configuration within the silo structure, positioned at different heights and radial locations. This spatial distribution allows material to be discharged from multiple zones simultaneously, eliminating the tunneling effect that occurs with single-point discharge
2Manufacturing precision
If multiple discrete discharges are made into each truck bed to prevent segregation, then material uniformity is improved, but the loading time increases
Solution Approach 1:
The silo is divided into multiple discharge zones with separate outlets, each capable of discharging material simultaneously. This allows the entire truck bed to be filled in a single operation rather than requiring multiple sequential discharges, reducing loading time while maintaining uniformity
Solution Approach 2:
Multiple discharge outlets are combined to discharge material simultaneously into the same truck bed. The coordinated operation of multiple gates opens at the same time, merging their discharge flows to fill the truck bed in one operation, thereby reducing total loading time while preventing segregation through proper outlet positioning
3Ease of operation
If the truck remains stationary during loading, then the loading process is simplified, but segregation occurs with coarse material at the periphery and fine material in the center
Solution Approach 1:
The discharge system is segmented into multiple outlets positioned at different locations (front, center, rear of truck bed area). This segmentation allows material to be discharged from multiple points simultaneously, creating a more uniform distribution pattern that prevents the coarse-material-at-periphery problem without requiring truck movement
Solution Approach 2:
The discharge outlets are positioned in a three-dimensional arrangement that corresponds to the truck bed geometry. By distributing outlets across different spatial locations, the system achieves uniform material distribution across the entire truck bed width and length, eliminating the need for truck movement to prevent segregation
4Duration of action of stationary object
If storage time in the silo is extended, then material availability is improved, but oxidation occurs creating hardened aggregate chunks
Solution Approach 1:
The silo interior is filled with an inert gas (nitrogen or carbon dioxide) to displace oxygen. This creates an oxygen-deficient atmosphere that prevents oxidation of the stored asphaltic mix, allowing extended storage durations without formation of hardened aggregate chunks, while maintaining material quality
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 triple hopper and gate system ensures rapid, uniform discharge of hot asphaltic mix, reducing segregation and oxidation risks, enabling faster and more consistent loading while maintaining material quality, with the ability to load trucks efficiently and accurately.
Implementation Method 1
when storing asphaltic mix in a silo, oxygen may tend to migrate into the silo and oxidize the mix creating hardened aggregate chunks
Data Source
AI summary
The silo includes at least three hoppers terminating in rectilinear discharge openings extending lengthwise transversely of a loading area below the discharge openings. Clam gates are movable between open and closed positions to discharge material. The discharge area at the bottom of the silo is increased, facilitating faster loading of trucks with the particulate material.