Header Float Arm Pressure Control for Ground-Following Cutter Bars
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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 potential engagement with the ground.
Innovation Solution
A system for controlling float arms between locked and unlocked configurations using pressurized fluids of different pressures to manage the position and flexibility of the cutter bar, allowing it to conform to ground topography and prevent engagement with the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the float arms are left in an unlocked configuration to allow the cutter bar to flex and follow ground contours, then the adaptability to ground topography is improved, but the cutter bar may engage with the ground causing damage to the field and headers
Solution Approach 1:
The float arm control system dynamically transitions the float arms between locked and unlocked configurations based on operating conditions. The system uses a control valve to direct pressurized fluid to the actuator, enabling the float arms to adapt their state (locked for stability, unlocked for flexibility) rather than remaining static, thus resolving the contradiction between adaptability and ground engagement damage
Solution Approach 2:
The system changes the physical state parameter of the float arms by using pressurized fluid to move them between locked and unlocked positions. This parameter change (position/state of float arms) allows the cutter bar to transition between rigid and flexible configurations, enabling the system to achieve both ground following capability and prevention of harmful ground engagement
2Strength
If the float arms are locked in a retracted position to maintain a rigid cutter bar structure, then the structural strength and stability are improved, but the ability to conform to ground contours is reduced
Solution Approach 1:
The system dynamically switches between locked and unlocked float arm configurations using a control valve and pressurized fluid system. This allows the cutter bar to transition from a rigid structure (locked) to a flexible configuration (unlocked), enabling the system to maintain structural strength when needed while achieving ground conformity when required
Solution Approach 2:
The float arm control system automatically manages the transition between locked and unlocked states based on operational requirements. The control valve and fluid pressure system work together to self-regulate the float arm position, eliminating the need for manual intervention and enabling the cutter bar to maintain optimal structural properties for each operating condition
3Measurement precision
If a control system using pressurized fluid is implemented to manage float arm position, then the precision of float balance control is improved, but the device complexity increases
Solution Approach 1:
The system uses pressurized fluid (hydraulic or pneumatic) to control the float arm position through an actuator and control valve. This fluid power system provides precise control of the float balance by utilizing fluid pressure to move the float arms between locked and unlocked configurations, achieving high control precision while leveraging well-established fluid power technology
Solution Approach 2:
The control valve acts as an intermediary device between the fluid source and the actuator, precisely controlling the flow of pressurized fluid to the actuator. This intermediary component enables fine-tuned control of the float arm position, achieving precise float balance control while keeping the overall system design modular and manageable
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 controlling the float balance of the header, preventing damage to the field and headers by ensuring the cutter bar follows ground contours without pushing into the soil.
Implementation Method 1
a first source of pressurized fluid in communication with the first valve and a second source of pressurized fluid in communication with the first valve. The first source of pressurized fluid may include a first fluid at a first fluid pressure
Implementation Method 2
the second source of pressurized fluid including a second fluid at a second fluid pressure. In the second position, the first valve may be configured to transmit the second fluid from the second fluid source and, in response, cause the float arm to move to the unlocked configuration
Data Source
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AI summary
The present invention relates to a systems (500) for controlling a position of one or more float arms in an unlocked configuration and includes a first valve (504) movable between a first position configured to cause the float arm to move to a locked configuration and a second position configured to cause the float arm to move to the unlocked configuration; a first source (507) of pressurized fluid in communication with the first valve (504); and a second source (509) of pressurized fluid in communication with the first valve (504). In the first position, the first valve may be configured to transmit the first fluid from the first source and, in response, to cause the float arm to move to the locked configuration. In the second position, the first valve may be configured to transmit the second fluid from the second fluid source and, in response, cause the float arm to move to the unlocked configuration.