Hydraulic Row Unit Down-Force Control for Planters
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Solution Overview
Problem
Agricultural planters face challenges in maintaining consistent seed depth and adapting to varying soil conditions, residue levels, and obstructions due to the limitations of traditional down-force systems, which are slow to adjust and can cause damage when encountering foreign objects.
Innovation Solution
The integration of a hydraulic cylinder and accumulator in a compact unit allows for rapid and remote adjustment of down-force, enabling each row unit to react independently to soil conditions by using a movable ram and a gas-charged accumulator for quick response and uniform force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional springs are used to urge row units downward, then the system is simple and reliable, but the adjustment speed is slow and cannot respond quickly to changing soil conditions or obstructions
Solution Approach 1:
The patent applies hydraulic technology by using a hydraulic cylinder connected to each row unit through a hydraulic line. The hydraulic system enables rapid adjustment of down-force by controlling fluid pressure, allowing the row unit to quickly respond to soil conditions and obstructions. The hydraulic cylinder converts hydraulic pressure into mechanical force to urge the row unit downward, providing fast and precise control compared to traditional spring-based systems.
2Reliability
If air bag systems are used to provide uniform down force, then the force distribution is improved, but the response time to change force levels is slow due to large air volume requirements
Solution Approach 1:
The patent uses a hydraulic system instead of pneumatic (air) systems. Hydraulic fluid is incompressible and can be delivered under high pressure through relatively small-diameter lines, enabling rapid force adjustment. The hydraulic cylinder receives pressurized fluid through a hydraulic line and quickly converts it to mechanical down-force, achieving both force uniformity and fast response time that air bag systems cannot provide.
3Adaptability or versatility
If combination spring/hydraulic shock absorbers are used, then some adjustment capability is provided, but the force increases when striking foreign objects causing damage to components
Solution Approach 1:
The hydraulic system provides controlled down-force adjustment through pressure regulation. When the row unit encounters an obstruction, the hydraulic system can rapidly reduce or maintain appropriate force levels, preventing the force multiplication that occurs in spring-based shock absorbers. The hydraulic cylinder offers precise force control that avoids component damage while maintaining adaptability to different soil conditions.
4Productivity
If hydraulics with a central accumulator are used, then force can be distributed to multiple row units, but pressure spikes develop when hitting obstructions at high speed
Solution Approach 1:
The patent implements a decentralized hydraulic system where each row unit has its own hydraulic cylinder and is connected through individual hydraulic lines. This segmentation allows each row unit to independently adjust its down-force without affecting others, eliminating pressure spikes that occur in centralized accumulator systems when one unit hits an obstruction at high speed.
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 solution enables efficient and precise control of down-force, allowing for independent movement of each row unit, reducing damage from obstructions and improving seed depth uniformity, leading to increased productivity and yield.
Implementation Method 1
a hydraulic cylinder coupled to the attachment frame and the linkage, for urging the row unit frame downwardly toward the soil, includes a movable ram extending into the cylinder, and a hydraulic-fluid cavity within the cylinder for receiving pressurized hydraulic fluid for advancing the ram
Implementation Method 2
An accumulator positioned adjacent to the hydraulic cylinder has a fluid chamber containing a diaphragm, with the portion of the chamber on one side of the diaphragm being connected to the hydraulic-fluid cavity in the hydraulic cylinder, and the portion of the chamber on the other side of the diaphragm containing a pressurized gas
Data Source
AI summary
An agricultural row unit for use with a towing frame hitched to a tractor includes an attachment frame adapted to be rigidly connected to the towing frame, a linkage pivotably coupled to the attachment frame, and a row unit frame having a leading end pivotably coupled to the linkage to permit vertical pivoting movement of the row unit frame relative to the attachment frame. A hydraulic cylinder coupled to the attachment frame and the linkage, for urging the row unit frame downwardly toward the soil, includes a movable ram extending into the cylinder, and a hydraulic-fluid cavity within the cylinder for receiving pressurized hydraulic fluid for advancing the ram in a direction that pivots the linkage and the row unit frame downwardly toward the soil. An accumulator positioned adjacent to the hydraulic cylinder has a fluid chamber containing a diaphragm, with the portion of the chamber on one side of the diaphragm being connected to the hydraulic-fluid cavity in the hydraulic cylinder, and the portion of the chamber on the other side of the diaphragm containing a pressurized gas.