Load Sensing Pin for Agricultural Implement Downforce Control
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Solution Overview
Problem
Conventional row-crop planters face challenges in accurately monitoring and controlling downforce, leading to either insufficient soil penetration or excessive soil compaction, which can result in poor root growth, germination issues, and irregular seed depth due to the imprecision of visually assessing downforce settings and varying soil conditions.
Innovation Solution
A system utilizing a load sensing pin with multiple bearing points, such as a 4-point or 3-point pin, and a rotational restraint arm, combined with a strain gauge transducer, to accurately measure and monitor downforce regardless of the depth adjustment mechanism's position, ensuring consistent and robust measurement without calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If downforce is increased to ensure full penetration of disk blades into soil, then penetration depth is improved, but excessive soil compaction occurs causing poor root growth and germination
Solution Approach 1:
The patent employs a load sensing pin with strain gauge transducer that provides real-time feedback on the downforce being applied to the row unit. This feedback mechanism allows the system to monitor the force applied to gauge wheels and disk blades, enabling precise control to achieve full penetration without excessive compaction. The electrical signal from the strain gauge can be used to automatically adjust downforce or alert the operator to maintain optimal levels.
Solution Approach 2:
The patent replaces visual inspection and manual estimation of downforce with an electronic sensing system. The strain gauge transducer converts mechanical downforce into an electrical signal, allowing for precise measurement and control. This substitution of mechanical sensing with electronic measurement enables accurate monitoring of the force applied to soil, preventing both insufficient penetration and excessive compaction.
2Object-affected harmful factors
If downforce is decreased to avoid excessive soil compaction, then root growth is improved, but disk blades fail to penetrate to full desired depth
Solution Approach 1:
The load sensing pin provides continuous feedback on the actual downforce applied, allowing the system to maintain the minimum necessary force for full penetration while avoiding excessive compaction. The strain gauge transducer enables real-time monitoring to ensure penetration depth is achieved without applying more force than necessary.
Solution Approach 2:
The electronic sensing system replaces imprecise visual assessment with accurate measurement of downforce. This allows for precise control at the lower end of the downforce spectrum, ensuring sufficient penetration without the need for excessive force that would cause compaction.
3Device complexity
If visual inspection is used to assess downforce settings, then device complexity is reduced, but measurement precision is insufficient leading to improper planting conditions
Solution Approach 1:
The patent substitutes visual inspection with an electronic sensing system consisting of a load sensing pin and strain gauge transducer. This replacement provides precise electrical measurement of downforce, transforming an imprecise visual assessment into an accurate quantitative measurement while maintaining relative system simplicity.
Solution Approach 2:
The strain gauge transducer acts as an intermediary between the mechanical downforce system and the measurement/control system. It converts mechanical force into an electrical signal that can be precisely measured and processed, providing accurate downforce information without requiring complex mechanical measurement mechanisms.
4Adaptability or versatility
If depth adjustment mechanism position is changed to adapt to varying soil conditions, then adaptability is improved, but measurement consistency deteriorates due to varying loading conditions on gauge wheel arms
Solution Approach 1:
The patent extracts the downforce measurement function from the depth adjustment mechanism by placing the load sensing pin on the row unit frame rather than on the gauge wheel arms. This separation removes the measurement system from the varying loading conditions caused by depth adjustments, allowing the depth mechanism to adapt freely while the measurement remains consistent.
Solution Approach 2:
The load sensing pin serves as an intermediary measurement point that is independent of the depth adjustment mechanism's position. By measuring downforce at this fixed location on the row unit, the system obtains consistent measurements regardless of how the gauge wheel arms or depth control mechanism are positioned, enabling adaptability without compromising measurement precision.
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 system allows for precise and consistent downforce measurement, enabling optimal soil penetration and compaction, thereby improving root growth, germination rates, and maintaining uniform seed depth across varying soil conditions.
Implementation Method 1
a strain gauge transducer positioned to detect the bending stress exerted on the pin
Implementation Method 2
employing a pressure sensor, such as a strain gauge or other pressure transducer, placed on or incorporated into the gauge wheel mounting structure to detect the compressive forces being exerted upon the gauge wheel mounting structure
Data Source
AI summary
A load sensing pin disposed to receive a load applied in a direction substantially transverse to a longitudinal axis of the pin. A load sensor is substantially fixedly oriented with respect to the applied load or alternatively with respect to the pin which is rotationally restrained with respect to a support structure. The load sensor is disposed to generate a load signal corresponding to strain of the pin resulting from the applied load.