Automatic Baffle Control for Truck Hopper Asphalt Flow
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Solution Overview
Problem
Existing systems for controlling the flow of asphalt material in material transfer vehicles are not optimized to maximize efficiency, leading to potential stalling of the truck-unloading conveyor and overtaxing of the engine during unloading operations, which can result in uneven pavement surfaces due to frequent stopping of the paving machine.
Innovation Solution
An automatic system that controls the power demand of the truck-unloading conveyor by adjusting the rate of asphalt material introduction from the supply truck to the surge bin using a baffle mechanism operated by a controller, which detects changes in hydraulic pressure and engine speed to optimize the flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hopper opening is kept large to maximize unloading speed, then productivity increases, but the conveyor may stall and the engine may be overtaxed
Solution Approach 1:
The baffle position is made dynamically adjustable rather than fixed. The controller automatically changes the baffle position based on real-time feedback from sensors monitoring hydraulic pressure and engine speed, allowing the system to optimize between maximum flow and stable operation conditions
Solution Approach 2:
The system incorporates feedback control through sensors that detect hydraulic pressure and engine speed, sending signals to the controller which adjusts the baffle position accordingly. This closed-loop control prevents conveyor stalling and engine overtaxing by maintaining optimal flow rates
2Reliability
If the hopper opening is restricted to prevent conveyor stalling, then reliability improves, but productivity decreases
Solution Approach 1:
Rather than using a fixed restricted opening, the system dynamically adjusts the baffle position based on actual operating conditions. When the conveyor is running smoothly, the opening can be larger for higher productivity. When signs of stalling appear, the opening is reduced to maintain reliability
Solution Approach 2:
The system changes the physical parameter of hopper opening size in response to changing operational parameters (hydraulic pressure, engine speed). This allows optimization of both reliability and productivity at different moments during the unloading process
3Quantity of substance
If the paving machine stops frequently to wait for material, then the hopper can be kept full, but the pavement surface becomes uneven
Solution Approach 1:
The system takes preliminary action by proactively controlling the material flow rate before the hopper becomes empty. By monitoring hopper material levels and adjusting the baffle position in advance, the system ensures continuous material availability, preventing paving machine stops and maintaining surface uniformity
Solution Approach 2:
The system aims to maintain continuous material flow to the paving machine without interruptions. By carefully controlling the unloading rate to match the paving machine's consumption rate, the system prevents hopper emptying and ensures uninterrupted paving operations with uniform surface 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
This system optimizes the unloading process, reducing the likelihood of conveyor stalling and engine overtaxing, thereby maintaining a consistent asphalt flow and minimizing surface irregularities by adjusting the hopper opening based on real-time operational parameters.
Implementation Method 1
the controller is adapted to control the flow rate of asphalt material into the truck-unloading hopper in order to optimize at least one vehicle operating parameter, such as the hydraulic pressure in the drive system for the truck-unloading conveyor
Implementation Method 2
the controller is adapted to control the flow rate of asphalt material into the truck-unloading hopper in order to optimize at least one vehicle operating parameter, such as the speed of the engine that provides power for the drive system of the truck-unloading conveyor
Implementation Method 3
A baffle is mounted to the truck-receiving hopper adjacent to the entry end of the truck-unloading conveyor, which baffle is adapted to increase or decrease the hopper opening into the truck-unloading conveyor
Data Source
AI summary
A system and method for automatically controlling the flow of asphalt material from a truck-unloading hopper of a material transfer vehicle into the entry end of an adjacent truck-unloading conveyor in order to optimize at least one vehicle operating parameter includes a baffle mounted to the truck-unloading hopper adjacent to the entry end of the truck-unloading conveyor. The baffle is adapted to increase or decrease the hopper opening into the truck-unloading conveyor. A controller is operatively connected to the baffle and adapted to cause the baffle to increase or decrease the hopper opening into the truck-unloading conveyor. A sensor is provided for detecting at least one vehicle operating parameter. This sensor is operatively connected to the controller so that changes in the at least one vehicle operating parameter can be communicated to the controller. The controller is adapted to control the flow rate of asphalt material into the truck-unloading hopper in order to optimize the at least one vehicle operating parameter.