Agricultural Header Float Arm Hydraulic Control for Ground Contours
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Solution Overview
Problem
Hinged draper headers experience issues with float arms lifting and engaging with the ground during harvesting, leading to damage to the field and headers due to improper weight transfer and ground engagement.
Innovation Solution
A system for controlling float arm movement using a proportional valve and fluid pressure to transition between locked and unlocked configurations, allowing precise control of the cutter bar's rigidity and flexibility to conform to ground topography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If float arms are made flexible to conform to ground topography, then adaptability to ground contours is improved, but control precision and stability deteriorate due to uncontrolled floating and engagement with the ground
Solution Approach 1:
The float arm system transitions from a static rigid connection to a dynamic controllable connection. The proportional valve enables continuous adjustment of hydraulic pressure to control the float arm's position and stiffness, allowing the system to adapt between rigid and flexible states based on ground conditions while maintaining precise control.
Solution Approach 2:
The system changes the physical parameter of stiffness by controlling hydraulic pressure in the float arm mechanism. By adjusting the proportional valve, the effective stiffness of the float arm connection is dynamically modified, enabling the cutter bar to conform to ground contours while preventing uncontrolled floating or engagement with the ground.
2Reliability
If float arms are locked in rigid position to maintain cutter bar stability, then control precision is improved, but adaptability to ground topography deteriorates due to inability to flex
Solution Approach 1:
The system replaces static rigid locking with dynamic controllable flexibility. The proportional valve allows continuous adjustment of the float arm's stiffness, enabling the cutter bar to be rigid when needed for precision and flexible when needed to conform to ground contours, thus resolving the contradiction between stability and adaptability.
Solution Approach 2:
The system dynamically changes the stiffness parameter of the float arm connection through hydraulic pressure control. This allows the cutter bar to transition between rigid and flexible states, maintaining control precision when rigidity is needed while achieving ground contour adaptation when flexibility is required.
3Adaptability or versatility
If float arms are allowed to flex freely to follow ground contours, then adaptability to ground topography is improved, but harmful engagement with the ground increases causing damage to field and headers
Solution Approach 1:
The system incorporates feedback control where the proportional valve responds to ground conditions and adjusts float arm stiffness accordingly. This feedback mechanism allows the cutter bar to follow ground contours while preventing excessive flexing that would cause harmful engagement with the ground, thus protecting both the field and header from damage.
Solution Approach 2:
The system dynamically adjusts the stiffness parameter of the float arm connection based on ground conditions. By controlling hydraulic pressure through the proportional valve, the system maintains optimal flexibility to follow contours while preventing over-flexing that would cause harmful ground engagement and damage to the field and header.
4Object-affected harmful factors
If float arms are controlled with high precision to prevent engagement, then harmful ground engagement is reduced, but device complexity increases due to additional control systems
Solution Approach 1:
The system uses hydraulic pressure control through a proportional valve to manage float arm stiffness. This hydraulic approach provides smooth, continuous control of the float arm's mechanical properties, enabling precise prevention of ground engagement while avoiding the complexity of multi-position mechanical switches or electronic actuators.
Solution Approach 2:
The system controls float arm stiffness by adjusting hydraulic pressure parameters through a single proportional valve. This parameter-based control approach provides high precision in preventing ground engagement while maintaining relatively simple device architecture, as the proportional valve can continuously adjust pressure without requiring complex mechanical or electronic control mechanisms.
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 effectively maintains harvest quality by preventing float arm engagement with the ground, reducing damage and ensuring smooth operation by adjusting weight transfer based on ground contours.
Implementation Method 1
A source of pressurized fluid including a fluid at a first fluid pressure
Implementation Method 2
a proportional valve that includes a first operational range and a second operational range. The proportional valve is alterable into a first plurality of configurations within the first operational range to produce a first plurality of fluid flow rates of the fluid to the first location
Data Source
AI summary
Systems, methods, and apparatus for controlling a position of one or more float arms in response to operation of a gauge wheel or in response to an input are described. In some instances, a float arm is moved to a selected position automatically in response to extension or retraction of a gauge wheel. In some instances, a position of a float arm in an unlocked configuration is altered in response to an input, such as a user input. In some instances, a position of the float arm is controlled in response to application of fluid pressures, such as hydraulic pressure. Fluidic pressure may be altered in response to changing a position of one or more valves.