Harvester Header Float Control for Uneven Terrain
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Solution Overview
Problem
Conventional crop harvesting headers with rigid frames or fixed mounts struggle to maintain balanced lift forces during lateral tilting, leading to imbalanced flex and reduced ground following capabilities, especially on uneven terrain.
Innovation Solution
A crop harvesting header with a mounting assembly featuring left and right float elements that apply controlled lift forces, equipped with sensors to detect tilt differences and a control system that adjusts lift forces to maintain balance, allowing the header to tilt and rotate to compensate for uneven ground, thereby maintaining effective ground following and extending the flex range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rigid frame or fixed mount is used for the header, then structural simplicity is maintained, but ground following capabilities deteriorate on uneven terrain
Solution Approach 1:
The mounting assembly transitions from a rigid fixed structure to a dynamic floating structure where the header can move vertically and laterally relative to the vehicle body. The float elements enable the header to adapt its position dynamically in response to ground conditions, resolving the contradiction between structural simplicity and ground following capability.
Solution Approach 2:
The system changes the positional parameters of the header relative to the vehicle body through the float elements. The header can change its vertical height and lateral position to match uneven ground conditions, thereby improving ground following capabilities while maintaining a relatively simple overall structure.
2Device complexity
If the header is fixedly mounted to the feeder house, then mounting simplicity is maintained, but adaptability to uneven terrain deteriorates
Solution Approach 1:
The mounting arrangement incorporates float elements that allow the header to move dynamically relative to the feeder house. This dynamic capability enables the header to respond to uneven ground conditions by adjusting its vertical and lateral positions, resolving the contradiction between mounting simplicity and terrain adaptability.
3Adaptability or versatility
If hydraulic float cylinders are used with pressure control valves, then full adjustability of flotation is achieved, but device complexity increases
Solution Approach 1:
The float elements are designed to provide self-regulating flotation where the header's own weight and the ground conditions automatically adjust the flotation level. This self-service mechanism reduces the need for complex external hydraulic control systems while maintaining full adjustability of flotation.
Solution Approach 2:
The system incorporates sensors that detect the header's position and ground conditions, providing feedback to automatically adjust the float elements. This feedback mechanism enables full adjustability of flotation while minimizing the complexity of manual hydraulic control systems.
4Adaptability or versatility
If the header is allowed to tilt freely, then ground following capability is improved, but lift force balance deteriorates
Solution Approach 1:
Sensors detect the header's tilt angle and provide feedback to the control system, which automatically adjusts the float elements to maintain lift force balance. This feedback mechanism enables the header to tilt for ground following while preventing excessive tilt that would compromise lift force balance.
Solution Approach 2:
The system dynamically changes the lift force parameters by adjusting the float elements based on sensor input. When the header tilts, the control system modifies the flotation characteristics to maintain balance, resolving the contradiction between ground following capability and lift force stability.
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 ensures balanced lift forces across the header, improving ground following capabilities and maintaining consistent cutting performance even on uneven terrain by dynamically adjusting lift forces based on tilt sensors, enhancing the header's ability to navigate side hills and varying ground heights.
Implementation Method 1
The float elements being arranged to allow lifting of each end of the header relative to an opposed end so as to change an angle of tilt of the header relative to the propulsion vehicle
Implementation Method 2
at least one sensor for detecting the angle of tilt of the header so as to detect when the left end is raised relative to the right end and when the right end is raised relative to the left end
Data Source
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AI summary
A harvesting header on a vehicle such as a combine harvester includes a mounting assembly comprising left and right float elements each for applying controlled left and right lift forces and arranged to allow upward floating of each end of the header in response to ground contact. Left and right sensors detect the angle of tilt of the header and a control system operates to reduce the left lift force when the left end is raised and to reduce the right lift force when the right end is raised. On a combine harvester this can be done by rotating the face plate of the feeder house in the required direction. In other systems the force generated by the left and right float elements can be directly modified. The changes to the lift force are applied only when the propulsion vehicle is tilted beyond a predetermined angle.