Weeding Harrow Tine Pressure Control for Selective Weed Removal
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Solution Overview
Problem
Existing harrowing implements struggle to effectively remove weeds without damaging cultivated plants due to uniform tine pressure across all soil conditions, leading to lateral movements that can uproot crops.
Innovation Solution
Adjusting the tine pressure of harrow tines based on soil conditions and the presence of cultivated plants using pressure regulating valves and cameras, applying higher pressure for weeds and lower pressure for crops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform tine pressure is applied across all harrow tines, then the harrowing implement is simple to operate and maintain, but cultivated plants are damaged due to lateral movements and excessive force
Solution Approach 1:
The harrowing implement divides the tine system into independent, controllable segments. Each harrow tine is equipped with its own pneumatic cylinder and pressure regulating valve, allowing individual pressure control for each tine based on whether it encounters weeds or cultivated plants. This segmentation enables selective application of force to different areas of the field.
Solution Approach 2:
The system applies different pressure characteristics to different spatial locations. Tines operating over weed areas receive higher pressure for effective uprooting, while tines operating over cultivated plant areas receive lower pressure to prevent damage. This local differentiation of pressure quality resolves the contradiction between effective weed control and crop protection.
2Productivity
If higher tine pressure is applied to effectively remove weeds, then weed control effectiveness improves, but cultivated plants are uprooted due to excessive force
Solution Approach 1:
The system dynamically adjusts the pressure of individual harrow tines in real-time based on what each tine encounters. Pneumatic cylinders with pressure regulating valves allow each tine to switch between high pressure (for weed removal) and low pressure (for crop protection) modes. This dynamic adaptability enables the system to maximize weed control effectiveness while minimizing crop damage.
Solution Approach 2:
The system changes the pressure parameter of each harrow tine independently based on local conditions. By modifying the air pressure supplied to individual pneumatic cylinders, the force exerted by each tine can be optimized for its specific task - either aggressive weed uprooting or gentle crop area traversal - thereby achieving high productivity without harmful side effects.
3Object-affected harmful factors
If individual pressure control is implemented for each harrow tine, then selective weed control without crop damage is achieved, but the device complexity increases due to multiple pressure regulating valves and pneumatic cylinders
Solution Approach 1:
Each harrow tine is equipped with its own pneumatic cylinder and pressure regulating valve, making the system self-regulating. The tines automatically adjust their own pressure based on local conditions without requiring centralized control intervention for each tine. This self-service approach distributes the control complexity across individual components rather than requiring a complex centralized control system.
Solution Approach 2:
The system uses pneumatic cylinders and air pressure regulation to achieve individual tine control. By utilizing compressed air as the actuating medium, the system achieves precise, responsive pressure control for each tine while avoiding the complexity of electrical sensors, actuators, and control electronics that would be required for equivalent performance.
4Ease of manufacture
If all harrow tines act with the same force, then the harrowing implement is simple to manufacture and maintain, but lateral movements cause tines to affect cultivated plants
Solution Approach 1:
The uniform tine system is segmented into independently controlled units. Each harrow tine becomes a separate, controllable element with its own pneumatic cylinder and pressure regulation system. This segmentation transforms a simple, uniform structure into a complex but controllable system that can reliably distinguish between weed and crop areas.
Solution Approach 2:
The static, uniform pressure system is transformed into a dynamic, adaptive system. Each tine can independently adjust its pressure output in real-time based on whether it encounters weeds or cultivated plants. This dynamic capability ensures reliable selective weed control while maintaining the basic mechanical simplicity of the harrow structure.
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
Effectively removes weeds while protecting cultivated plants by selectively adjusting tine pressure, ensuring precise weed control without crop damage.
Implementation Method 1
pneumatic cylinders, acting as springs, pre-tension the tines into their working position
Implementation Method 2
pneumatic cylinders, acting as springs, pre-tension the tines into their working position
Implementation Method 3
adjusting the pressure regulating valves assigned to the pneumatic cylinders so that the tines of the harrow operate with lower pressure when the harrow is used within the area of cultivated plants
Data Source
Figure 1
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AI summary
When removing weeds by harrowing with a harrowing implement (1) that has harrow tines (5) pivoting against spring force, the force with which the harrow tines (5) act in the area of cultivated plants is selected to be lower than the force with which the harrow tines (5) act in the area of weeds. In the harrowing implement (1), pneumatic springs assigned to the harrow tines (5) acting in the area of cultivated plants are subjected to a lower pressure by compressed air than pneumatic springs assigned to the harrow tines (5) acting in the area of weeds.