Electric Actuator Down Force Control for Row Units
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Solution Overview
Problem
Conventional agricultural devices lack accurate and predictable down force adjustment in row units, leading to inconsistent seed depth and potential soil compaction or shallow seed placement, due to reliance on springs or airbags which are difficult to precisely control.
Innovation Solution
A row unit adjustment system using a four-bar linkage with an electric actuator and biasing member, allowing for precise adjustment of down force through a sensor-actuated mechanism that can apply both positive and negative pressure, enabling quick and accurate force adjustments based on soil conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If springs or airbags are used as biasing means in the four-bar linkage, then down force is applied to help seed channel opener penetrate the soil and minimize row unit bounce, but the system lacks accuracy and predictability in determining the exact down force applied
Solution Approach 1:
The patent employs sensors (load cells, force sensors) integrated into the four-bar linkage to continuously measure the actual down force being applied to the row unit. This measured force is fed back to a control system that compares it against a desired force setpoint, enabling real-time monitoring and adjustment to maintain precise down force control throughout operation.
Solution Approach 2:
The invention replaces the purely mechanical spring or airbag biasing systems with an electronically controlled actuator system. This substitution allows for precise electronic control of down force through motorized adjustment of the biasing member position, eliminating the imprecision inherent in mechanical spring compression or airbag volume estimation.
2Ease of operation
If manual adjustment of spring position is used to control down force, then down force can be adjusted, but the adjustment process is time-consuming and lacks precision
Solution Approach 1:
The patent implements a dynamically adjustable down force system where the biasing member position can be changed in real-time during operation. The electric actuator enables continuous adjustment of spring compression or airbag volume based on soil conditions, seed depth requirements, or operator preferences, transforming a static adjustment system into a dynamic one that adapts to changing conditions.
Solution Approach 2:
Manual mechanical adjustment of spring position is replaced with an electrically controlled actuator system. This substitution enables precise, rapid adjustment of down force through electronic control rather than manual manipulation, significantly reducing adjustment time and improving operational efficiency.
3Manufacturing precision
If excessive down force is applied to ensure consistent seed depth, then seed placement depth is maintained, but soil compaction increases and wear on soil-engaging components accelerates
Solution Approach 1:
The system uses sensors to continuously monitor the actual down force applied to the row unit and provides feedback to a control system. This feedback mechanism enables the system to apply only the precise amount of down force needed to maintain consistent seed depth without excessive force, thereby preventing soil compaction while ensuring accurate seed placement.
Solution Approach 2:
The patent enables dynamic adjustment of down force parameters based on operating conditions. The control system can modify the biasing member position to change the down force level, allowing optimization between seed depth consistency and soil health by applying minimal necessary force rather than constant high force.
4Device complexity
If the row unit weight is used to provide down force, then no additional biasing mechanism is needed, but the down force is insufficient in rough soil conditions causing row unit bounce and inconsistent seed depth
Solution Approach 1:
The patent introduces an electric actuator as an intermediary component between the row unit weight and the biasing member (spring or airbag). This actuator actively adjusts the biasing member position to modulate the down force, combining the simplicity of using row unit weight with the reliability of active force control to prevent bounce and ensure consistent seed depth.
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 consistent seed depth maintenance and reduces soil compaction by allowing precise control over down force, minimizing bounce in rough soil conditions and extending the life of soil-engaging components.
Implementation Method 1
The other end of the spring is connected to a spring mount that is disposed on the top arm and coupled to an electric actuator. The spring mount is longitudinally movable in both directions of the top arm. The electric actuator moves the spring mount forward and backward along the top arm
Implementation Method 2
At least one spring is provided between the top and bottom arms and connected at one end to the bottom arm in a fixed manner at a connection point
Implementation Method 3
Each row unit is mounted to the toolbar by means of a four-bar linkage or its equivalent which allows each row unit to move vertically to adjust to the contour of the soil independently of the other row units on the same toolbar
Data Source
AI summary
An agricultural device includes a number of row units that each includes a seed furrow opener that creates a furrow in the soil for seed placement. Each row unit is mounted to a toolbar of the device by a four-bar linkage which allows each row unit to move vertically to adjust to the contour of the soil independently of the other row units on the same toolbar. The four-bar linkages include one or more springs which work to transfer weight from the toolbar to the row unit. An actuator varies the tension in the spring thereby adjusting the down or up force applied to the row unit.