Sod Harvester Flap Control for Uniform Roll Positioning
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Solution Overview
Problem
Existing sod harvesters fail to consistently position the end flap of sod rolls uniformly, affecting the appearance and stability of sod stacks, which is crucial for sales and preventing rolls from falling off pallets.
Innovation Solution
A sod harvester with a flap control device comprising a start gate, sensors, and conveyors that ensure the end flap of each sod roll is positioned consistently by activating the rollup conveyor based on sensor triggers and encoder measurements, allowing for adjustable rotation duration to maintain uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sod harvesting methods are used, then sod rolls are produced and stacked, but the end flap position varies inconsistently across rolls
Solution Approach 1:
The system performs preliminary actions by using sensors to detect the sod piece position and trigger the rollup conveyor before the sod is fully processed. The encoder pre-measures the rotational distance needed, and the system prepares the flap control device in advance to ensure the end flap will be positioned correctly when the roll is complete, rather than attempting to adjust it after the fact.
Solution Approach 2:
The system implements feedback through sensors that detect the position of sod pieces and encode the rotational distance of the rollup conveyor. This feedback loop allows the control system to monitor and adjust the rolling process in real-time, ensuring the end flap reaches the precise target position on each sod roll, thereby achieving consistent positioning across all rolls.
2Stability of the object's composition
If the end flap position is not controlled, then the device operation is simple, but the sod stack appearance is uneven and rolls may fall off pallets
Solution Approach 1:
The system uses an intermediary approach by introducing a control mechanism that mediates between the rollup conveyor and the end flap positioning. The encoder and sensor system acts as an intermediary that translates conveyor rotation into precise flap position control, ensuring the end flap lands at the correct position without requiring direct mechanical intervention on the flap itself.
Solution Approach 2:
The invention replaces purely mechanical positioning methods with a system that uses sensors and encoders to detect and measure position. This substitution of mechanical sensing with electronic detection allows for more precise and consistent end flap positioning, improving stack stability while reducing the complexity of mechanical adjustment mechanisms.
3Measurement precision
If sensor and encoder systems are added to control flap position, then positioning precision improves, but device complexity and cost increase
Solution Approach 1:
The system employs self-service principles by using the existing rollup conveyor's own rotation to generate the measurement data through the encoder. Rather than requiring a separate measurement system, the conveyor's rotational movement itself is encoded and used to control the positioning, making the system self-measuring and reducing the need for additional complex sensing infrastructure.
Data Source
AI summary
A method of arranging sod rolls on a pallet including the steps of using a sod harvester to create a plurality of sod rolls and deposit them onto a platform; rotating all but one of the sod rolls so that an end flap on each of the sod rolls is at the same position; rotating the first sod roll for a duration that is longer than the duration by which the remaining sod rolls are rotated so that an end flap on the first sod roll is in a different position on the first sod roll than the end flaps on the remaining sod rolls; using a sod carrier to pick up the plurality of sod rolls from the platform simultaneously; and depositing the plurality of sod rolls simultaneously onto a pallet such that the end flap on the first sod roll faces outward and is viewable by consumers.