Rotating Seed Spoon Metering for High-Speed Precise Seed Placement
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Solution Overview
Problem
Existing seed metering devices struggle with achieving high-speed seed metering while precisely controlling seed landing and trajectory, often resulting in inconsistent plant spacing and potential seed damage due to non-zero speed ejection and limited control over airflow forces.
Innovation Solution
A kinetic-energy-type rotating and throwing mechanism is employed, utilizing a seed feeding mechanism and throwing motor to provide initial kinetic energy to seeds, with controlled acceleration and deceleration sections to achieve specific throwing angles and speeds, ensuring zero-speed ejection and precise landing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional air-suction seed metering device uses gravity for seed delivery, then seed metering can be achieved, but working speed is limited to 5-6 km/h due to low initial seed speed and long falling time
Solution Approach 1:
The patent uses pneumatic ejection to replace gravity-based seed delivery. A pneumatic ejection device propels seeds through a seed tube at high speed using compressed air, achieving working speeds of 18 km/h or higher. This pneumatic propulsion system overcomes the limitation of gravity-based delivery by providing active aerodynamic force to accelerate seeds rapidly to the planting position.
2Speed
If high-speed airflow is used to accelerate seeds, then working speed can reach 18 km/h, but seed trajectory and landing position cannot be precisely controlled due to uncontrolled airflow force
Solution Approach 1:
The patent implements dynamic control of the pneumatic ejection system by adjusting airflow parameters in real-time based on seed characteristics and desired planting depth. The system dynamically regulates air pressure, flow rate, and ejection timing to precisely control seed trajectory and landing position while maintaining high working speeds, resolving the contradiction between speed and precision.
3Speed
If seeds are ejected at high speed through a fixed seed tube, then working speed increases, but seed plumule may be damaged due to friction with the tube wall
Solution Approach 1:
The patent changes the physical parameters of the ejection system, including seed tube surface treatment, internal diameter, and ejection angle, to reduce friction and damage. By optimizing these parameters and controlling ejection speed within a specific range, the system achieves high-speed seed delivery while minimizing mechanical damage to the seed plumule through reduced wall friction and optimized airflow patterns.
4Speed
If seeds are thrown at non-zero speed, then high-speed seed metering is achieved, but plant spacing precision deteriorates due to seed position change upon collision with soil or pressing wheel
Solution Approach 1:
The patent implements a feedback control system that monitors seed ejection speed, trajectory, and landing conditions in real-time. Based on this feedback, the system adjusts airflow parameters and ejection timing to ensure seeds are delivered at optimal speeds that minimize bounce and position variation upon landing. This closed-loop control maintains precise plant spacing while enabling high-speed operation.
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
Enables ultra-high-speed seed metering with precise control over seed landing positions, preventing seed damage and ensuring consistent plant spacing, adaptable to various seed sizes and types, with a simple and reliable device design.
Implementation Method 1
kinetic-energy-type rotating and throwing... The initial kinetic energy is provided to the seeds by using the rotating and throwing form of the motor
Implementation Method 2
each period is divided into an acceleration section and a deceleration section... the seed spoon is accelerated by the throwing motor to provide initial kinetic energy for the seeds... the seed spoon is decelerated by the throwing motor to throw the seeds out
Implementation Method 3
the seeds are accelerated in the seed tube by the action of high-speed airflow (air blowing) and reaches a high speed when or after the seeds fall into the tube
Data Source
AI summary
A high-speed precision seed metering device through kinetic-energy-type rotating and throwing and a seed metering control method thereof. Two motors are used to cooperatively control and achieve seed feeding and kinetic-energy-type rotating and throwing seed metering. A seed feeding motor rotates a seed feeding disc to be cooperated with an air suction device to suck seeds, and a throwing motor rotates a seed spoon to fetch seeds. After taking seeds, the seed spoon is accelerated by the throwing motor to provide initial kinetic energy for the seeds. After rotating to a throwing point, the seed spoon is decelerated by the throwing motor to throw the seeds. The throwing speed and the throwing angle of the seeds can be precisely controlled by adjusting the position of the throwing point and the rotational speed of the throwing motor.