Harvester Header Float Cylinder Damping Control
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Solution Overview
Problem
Agricultural harvesters face challenges in maintaining a consistent height above the ground while navigating uneven terrain and obstacles, leading to potential damage and reduced harvesting efficiency due to inadequate float force management in their header systems.
Innovation Solution
A header assembly with a float cylinder and accumulator, coupled via fluidic circuitry, provides a controlled float force to maintain the header's height above the ground, utilizing a restricted fluid flow during lowering operations to dampen the impact of obstacles and ensure smooth ground following.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the header is lowered quickly to engage crop, then harvesting productivity is improved, but impact damage from obstacles increases
Solution Approach 1:
The hydraulic circuit is configured to provide restricted fluid flow during lowering operations, creating damping force beforehand to cushion potential impacts from obstacles. This allows the header to be lowered quickly while preventing damage by absorbing impact energy through controlled hydraulic resistance.
Solution Approach 2:
The patent uses a hydraulic system with fluidic circuitry to control the lowering speed of the header. The restricted fluid flow creates hydraulic damping that slows the lowering operation, allowing quick engagement while preventing impact damage through controlled hydraulic resistance.
2Reliability
If float force is increased to maintain header height, then ground following capability is improved, but control precision during lowering operations deteriorates
Solution Approach 1:
The hydraulic circuit is configured to dynamically adjust fluid flow characteristics based on operational phase. During normal operation, float force maintains ground following, but during lowering operations, the circuit provides restricted flow for precise control. This dynamic adjustment resolves the contradiction between maintaining float force and achieving control precision.
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
This solution enhances the harvesting performance by allowing the header to effectively follow ground contours and absorb impacts from obstacles, reducing damage and improving crop collection efficiency.
Implementation Method 1
provide a first flow of pressurized fluid under pressure to the float cylinder, so the float cylinder exerts a float force on the second frame assembly
Implementation Method 2
provide a restricted flow of fluid, that is restricted relative to the first flow, between the float cylinder and the accumulator
Data Source
AI summary
A header assembly for an agricultural harvesting machine comprises a first frame assembly, a second frame assembly that supports a cutter, and is pivotable relative to the first frame assembly, a float cylinder coupled between the first frame assembly and the second frame assembly, an accumulator, and fluidic circuitry that fluidically couples the accumulator to the float cylinder. The fluidic circuitry is configured to provide a first flow of pressurized fluid under pressure to the float cylinder, so the float cylinder exerts a float force on the second frame assembly, and based on a control input that corresponds to a lowering operation of the header assembly, provide a restricted flow of fluid, that is restricted relative to the first flow, between the float cylinder and the accumulator.