Automatic Down Pressure Adjustment for Ganged Disc Openers
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Solution Overview
Problem
Agricultural implement operators face challenges in setting optimal down pressure for disc openers due to uncertainty in soil conditions, often leading to excessive force that can cause premature failure of gauge wheel assemblies and related components.
Innovation Solution
A down pressure control system that uses a load sensor to measure strain on the gauge wheel assembly and adjusts the hydraulic fluid flow and pressure in real-time to maintain consistent disc penetration depth, reducing stress on the gauge wheel and optimizing down force application based on changing soil conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the down pressure system is set to apply excessive down force to ensure sufficient penetration, then the disc can penetrate to the desired cutting depth under varying soil conditions, but the gauge wheel assembly, control lever, and gauge wheel bearings may fail prematurely due to excessive stress
Solution Approach 1:
The patent implements a feedback control system where a load sensor continuously monitors the actual down force applied to the disc and provides this information to a controller. The controller compares the measured force with the desired force and automatically adjusts the hydraulic cylinder output via a control valve to maintain the optimal down force, preventing both insufficient penetration and excessive stress on components.
Solution Approach 2:
The down pressure control system is self-regulating, automatically adjusting the down force based on real-time soil conditions and disc penetration resistance. The system uses the load sensor feedback to self-correct any deviations from the optimal down force setting without requiring operator intervention, thereby protecting components from damage while ensuring reliable penetration.
2Adaptability or versatility
If the down pressure setting is adjusted to accommodate different soil conditions, then the disc can maintain consistent penetration depth, but the operator may be unsure of the appropriate setting and consistently apply excessive down force
Solution Approach 1:
The control system eliminates the need for operator judgment and manual adjustment by automatically monitoring soil conditions through the load sensor and self-adjusting the down force accordingly. The system handles the complexity of adapting to varying soil conditions autonomously, providing a simple operator interface while maintaining optimal performance across different soil types and conditions.
Solution Approach 2:
The patent replaces the traditional mechanical manual adjustment system with an automated electro-hydraulic control system. Instead of requiring the operator to physically adjust mechanical components based on soil condition assessment, the system uses electronic sensors and controllers to automatically regulate the hydraulic down force, substituting complex manual decision-making with automated measurement and control.
3Productivity
If a load sensor is installed to measure strain on the gauge wheel assembly for automatic adjustment, then the down force can be optimized in real-time, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent utilizes the existing hydraulic system infrastructure to implement the automatic down force control. The hydraulic cylinder that provides down force is integrated with the control system, allowing electronic control signals to directly modulate hydraulic fluid flow and pressure. This approach leverages the inherent advantages of hydraulic systems for force control while avoiding the need for entirely new actuation mechanisms, thereby limiting the increase in overall system 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 system automatically adjusts down force to accommodate varying soil conditions, reducing the risk of gauge wheel failure and maintaining consistent cutting depth without requiring operator input, thereby optimizing down force application and extending the lifespan of components.
Implementation Method 1
The load sensor, which may be a strain gauge for example, senses the strain placed on the gauge wheel assembly during a change in soil conditions
Implementation Method 2
a down pressure system, which typically includes a hydraulic cylinder, applies a down force on the disc
Data Source
AI summary
A disc opener unit for an agricultural implement has a down pressure adjustment device that automatically adjusts the amount of down pressure applied on a furrowing disc based on strain measurements taken by a strain gauge or load cell. The strain gauge, which may be mounted to an arm that is used to set the position of a depth setting gauge wheel, provides feedback to a processor that in turn controls the amount of hydraulic fluid in a hydraulic cylinder to adjust the down force applied on the disc. The amount of down pressure is therefore adjusted in substantially real-time in response to changes in field conditions, which improves furrow depth consistency and reduces wear on the gauge wheel and its components.