Spiral Conveyor Thermal Processing Uniformity via Drive Drum Tower
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Solution Overview
Problem
Spiral conveyor-based thermal processing systems face challenges in achieving uniform thermal treatment of work products due to the indirect exposure of inner layers to the thermal processing medium, resulting in uneven heat distribution across the conveyor width.
Innovation Solution
The thermal processing apparatus features a drive drum tower with strategically placed openings and a top sheeting system that directs thermal processing medium to flow both around and through the drive drum, ensuring uniform heat distribution by allowing a portion of the medium to enter the drive drum tower and redistribute across the conveyor stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If work products are arranged in stacked layers in a spiral conveyor, then a relatively long processing path is achieved with a small footprint, but the work products are not as directly accessible to the thermal processing medium resulting in less direct thermal processing
Solution Approach 1:
The drive tower is segmented with multiple openings distributed across its surface area, allowing thermal processing medium to penetrate through different zones of the spiral stack simultaneously, thereby improving temperature uniformity while maintaining the compact spiral configuration
Solution Approach 2:
The thermal processing medium acts as an intermediary by being introduced through openings in the drive tower, allowing it to reach inner layers of the spiral stack that would otherwise be shielded, thus improving thermal accessibility without changing the spiral stack geometry
2Productivity
If fan system directs thermal processing medium horizontally across the layers of the spiral stack, then the processing medium circulates through the stack, but disproportionate heat energy is absorbed by work product along the outer perimeter resulting in non-uniform treatment
Solution Approach 1:
Multiple openings are strategically positioned at different locations and elevations on the drive tower surface, creating localized entry points for thermal processing medium that target specific zones of the spiral stack, thereby achieving more uniform heat distribution across both inner and outer perimeter products
3Manufacturing precision
If openings are added to the drive drum tower to improve thermal distribution, then uniformity of thermal processing is enhanced, but device complexity increases
Solution Approach 1:
The drive tower structure serves multiple functions: it provides mechanical support for the spiral conveyor, houses the drive mechanism, and acts as a distribution manifold for thermal processing medium through its openings, thereby improving thermal uniformity without adding separate complex components
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 enhances uniform thermal processing across the entire width of the conveyor belt, reducing temperature differences between inner and outer products from 8°F to 1°F, ensuring more consistent treatment of work products.
Implementation Method 1
a fan system is used to direct the flow of thermal processing medium in the form of 100% steam or air or a mixture of steam and air horizontally across the layers of the spiral stack
Implementation Method 2
a circulation system to collect gaseous thermal processing medium from the tiers on the spiral stack and direct processing medium along an upward flow path located outward of the spiral stack to an elevation above the top sheeting, and then across the top sheeting, and then in a downward flow path along the exterior of the spiral stack
Data Source
AI summary
A conveyor belt is arranged in tiers at spiral stack conveyor unit. A ceiling is positioned over the spiral stack(s). A circulation fan draws thermal processing medium laterally from the tiers of the spiral stack, up the exterior of the stack and across the ceiling and through a heat exchanger. The treated thermal processing medium is then routed across the remainder of the diameter of the spiral stack and then down the side of the spiral stack diametrically opposite to the circulating fan to enter the spiral stack in a lateral direction diametrically toward the circulating fan. The thermal processing medium flows into an opening formed in the ceiling downstream of the heat exchanger and into the interior of the conveyor drive hub and then into the spiral stack through openings in the drive hub outer wall.