Air-Suction Seed Metering With Direct Drive and Adjustable Vacuum
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Solution Overview
Problem
Traditional air-suction seed metering devices face challenges with complex structures, variable negative pressure due to diesel engine speed changes, and inability to adjust suction pressure in real time for different crops, leading to precision seeding difficulties.
Innovation Solution
An intelligent numerical control air-suction seed metering device driven by an internal motor, with an adjustable internal fan speed controlled by a single intelligent seed-metering controller, and a direct drive motor to enhance precision and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional air-suction seed metering devices use a diesel engine-driven fan connected through branch pipes to multiple negative pressure chambers, then the device can serve multiple seed metering units, but the structure becomes complex with large volume occupied by pipelines and the negative pressure suction becomes difficult to adjust for different crop types
Solution Approach 1:
The patent divides the traditional centralized fan system into multiple independent fan units, with each seed metering device having its own fan. This segmentation allows each unit to independently adjust negative pressure for different crop types while eliminating the complex pipeline network that connected multiple chambers to a single fan, thus resolving the contradiction between adaptability and structural complexity
Solution Approach 2:
The patent implements variable speed control for each fan unit, allowing the rotational speed to be dynamically adjusted according to different crop types and seeding requirements. This dynamic adjustment capability enables each seed metering device to adapt to different crops independently, maintaining high adaptability while the simplified structure reduces overall device complexity
2Reliability
If the fan rotational speed varies during the starting stage and normal driving stage of the seeder, then the fan can adapt to different operating conditions, but the negative pressure suction becomes difficult to adjust and varies unintentionally affecting precision seeding rate
Solution Approach 1:
The patent incorporates feedback control mechanisms where the controller monitors the actual negative pressure suction and fan rotational speed, then adjusts the fan speed accordingly to maintain stable and accurate negative pressure levels. This feedback system ensures that negative pressure suction remains stable during operation while still being adjustable for different crop types, resolving the contradiction between reliability and ease of operation
Solution Approach 2:
The system automatically adjusts fan rotational speed based on pre-set parameters for different crop types, eliminating the need for manual adjustment during operation. The controller self-regulates the negative pressure suction to remain stable throughout the seeding process, maintaining both reliability and operational simplicity
3Power
If traditional land wheel transmission is used to drive the seed metering device, then the device can be powered by the seeder's motion, but power loss occurs and the structure becomes more complex
Solution Approach 1:
The patent replaces the traditional mechanical land wheel transmission system with a direct drive motor that powers the fan and seed metering components directly. This substitution eliminates the intermediate transmission mechanisms, reducing power loss and simplifying the overall structure, thus resolving the contradiction between power efficiency and device complexity
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 device achieves stable and precise seed metering with adjustable negative-pressure suction, reducing power loss and structural complexity, enabling accurate seeding rates for various crops.
Implementation Method 1
The direct drive motor includes a stator core and multiple magnets, the stator core is fixed on an outer wall surface of the fixed cylinder, a winding is wound on the stator core, the multiple magnets are fixed on an inner wall surface of the transmission intermediate wheel to be opposite to the stator core, and polarities of the magnets are alternated
Implementation Method 2
The internal fan is arranged inside the fixed cylinder, where an inner side port of the fixed cylinder is a fan air inlet, and an outer side port of the fixed cylinder is a fan air outlet; a negative pressure chamber is formed between the seed metering plate and the internal fan
Data Source
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AI summary
An intelligent numerical control air-suction seed metering device is provided, and relates to the technical field of air-suction seed metering devices. The intelligent numerical control air-suction seed metering device includes a front housing, a rear housing, a seed metering plate, an internal fan, a direct drive motor and a single intelligent seed-metering controller. The front housing is provided with a seed inlet, a seed metering port and an air inlet, and the internal fan is arranged on the rear housing. Seed suction ports are formed in the seed metering plate, a seed filling chamber is formed between the seed metering plate and the front housing, and a negative pressure chamber is formed between the seed metering plate and the internal fan. The seed metering plate is connected with a transmission intermediate wheel. The direct drive motor includes a stator core and multiple magnets, the stator core is fixed on an outer wall surface of a fixed cylinder, and the magnets are fixed on the transmission intermediate wheel. According to the intelligent numerical control air-suction seed metering device, the seed metering device is directly driven by an internal motor, so that the seed metering device is more stable and precise in operation. The speed of the internal fan can be adjusted in real time by the single intelligent seed-metering controller according to seeding requirements and crop types, so that the seed metering device can reach the most suitable negative-pressure suction, the precise seeding rate of a single seed metering device is adjusted, and the purpose of improving the seeding accuracy is reached.