Header Float Arm Hydraulic Control for Ground-Conforming Harvesting
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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 the formation of ruts and reduced crop harvest quality.
Innovation Solution
A system for controlling float arm operation using pressurized fluid valves and actuators to move between locked and unlocked configurations, with pressure sensors and flow control mechanisms to manage float arm position and weight transfer, preventing engagement with the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If float arms are allowed to flex freely in unlocked configuration, then cutter bar can conform to ground contours, but float arms may lift and engage with ground causing damage
Solution Approach 1:
The float arm system dynamically transitions between locked and unlocked configurations based on operational conditions. The hydraulic actuator enables the float arm to be locked when ground contact is detected and unlocked when flexing is required, providing adaptive control that prevents damage while maintaining conformability.
Solution Approach 2:
The system incorporates feedback mechanisms through pressure sensors and hydraulic control that monitor float arm position and ground contact conditions. This feedback enables automatic adjustment of float arm configuration to prevent engagement with the ground while allowing necessary flexing for contour following.
2Object-affected harmful factors
If float arms are locked in retracted position, then pushing and damage to field is reduced, but cutter bar cannot conform to ground contours
Solution Approach 1:
The float arm system dynamically transitions between locked and unlocked configurations based on operational conditions. The hydraulic actuator enables the float arm to be locked when ground contact is detected and unlocked when flexing is required, providing adaptive control that prevents damage while maintaining conformability.
Solution Approach 2:
The system changes the mechanical state parameter of the float arm between locked and unlocked positions. This parameter change allows the cutter bar to transition between rigid (locked) and flexible (unlocked) states, enabling the system to adapt to different ground conditions and prevent pushing while maintaining conformability when needed.
3Manufacturing precision
If hydraulic system uses first valve to control float arm position, then float arm can be positioned accurately, but system complexity increases
Solution Approach 1:
The hydraulic system uses an intermediary fluid medium to transmit control signals from the valve to the actuator. This fluid-based intermediary enables precise position control through pressure regulation while keeping the mechanical linkage simple. The hydraulic fluid acts as a mediator that converts valve position into precise actuator movement.
Solution Approach 2:
The system employs hydraulic principles to achieve precise float arm positioning. The first valve regulates fluid pressure to control the actuator, providing accurate position control with relatively simple mechanical components. The hydraulic system leverages fluid pressure and flow control to achieve precision without complex mechanical linkages.
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
Maintains harvest quality by allowing the cutter bar to conform to ground contours while reducing the risk of pushing and damage, ensuring smooth harvesting operations.
Implementation Method 1
fluid at a first fluid pressure... fluid from the source of pressurized fluid actuates the actuator to move the float arm into the locked configuration
Implementation Method 2
pressure sensor at a location downstream of the first valve, the pressure sensor configured to sense a pressure of the fluid at the first location
Implementation Method 3
The second valve includes an orifice configured to control a flow rate of fluid through the first valve
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.