Screening and Transport Rollers for Nut Debris Separation
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Solution Overview
Problem
Current nut harvesting technologies, such as conveyor belt screens, fail to effectively remove dirt, dust, and debris, including sticks, from tree crop products, as they do not provide adequate separation and often allow large debris to accompany the harvested nuts to processing plants.
Innovation Solution
A system utilizing a roller support frame with orthogonally disposed double-ended screening and transport rollers, each comprising disk-shaped members with curved projections and open-ended slots, which rotate to separate nuts from debris, with voids sized to allow nuts to pass through while retaining larger debris like sticks, utilizing a prime mover and transmission structure for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conveyor belt screens are used to remove debris from harvested nuts, then the system is simple and easy to operate, but the debris removal effectiveness is insufficient and large debris like sticks remain
Solution Approach 1:
The system divides the debris removal function into multiple segments: screening rollers for small debris (dirt, dust) and transport rollers for large debris (sticks). Each roller type performs a specific separation function, with screening rollers creating voids for small particles to fall through while transport rollers convey larger debris to collection points.
Solution Approach 2:
The invention transitions from a single-plane conveyor belt screen to a three-dimensional roller system where debris can be removed in multiple directions. Screening rollers create vertical voids for small debris to fall through, while the roller arrangement provides lateral separation for larger debris, adding dimensional complexity to improve separation effectiveness.
2Productivity
If conventional conveyor belt screens are used, then the device complexity is low, but the productivity and processing efficiency are reduced due to inadequate debris removal
Solution Approach 1:
The system performs preliminary debris removal at the harvesting site before nuts are transported to processing plants. By separating both small and large debris in the field, the system prevents contaminated material from entering subsequent processing stages, improving overall productivity and reducing downstream processing requirements.
Solution Approach 2:
The roller system performs multiple functions simultaneously: screening small debris through voids, transporting large debris to collection points, and conveying cleaned nuts forward. This multi-functionality consolidates what would otherwise require separate processing steps, enhancing productivity despite increased device complexity.
3Manufacturing precision
If screening rollers with voids are used to allow nuts to fall through, then nuts are effectively separated from small debris, but the system complexity increases with multiple rollers and offset configurations
Solution Approach 1:
Different regions of the roller system have specialized structures optimized for specific separation tasks. Screening rollers feature voids and projections configured for small debris separation, while transport rollers have continuous surfaces for large debris conveyance. This local specialization improves separation precision while distributing complexity across functional zones.
Solution Approach 2:
Adjacent rollers are positioned with asymmetric offset configurations where screening rollers and transport rollers alternate in specific patterns. This asymmetric arrangement creates optimized void spaces and debris flow paths, improving separation precision by directing different debris types to appropriate collection points rather than using uniform symmetric spacing.
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 system efficiently separates nuts from dirt and debris, ensuring cleaner products by allowing nuts to fall through while retaining sticks and other large debris, enhancing the processing efficiency and quality of tree crop products.
Implementation Method 1
allowing debris to fall between the screening and transport rollers during transport of product
Data Source
AI summary
A system for removing debris from tree crop product utilizes a plurality of screening and transport rollers which have disk-shaped members having projections that are curved and extend rearwardly in a direction opposed to the direction of rotation of the rollers, at least a portion of the projections of adjacent rollers overlapping to form voids.