Harvester Header Float Control for Stable Height and Obstacle Cushioning
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Solution Overview
Problem
Agricultural harvesters face challenges in maintaining optimal height and terrain following due to inadequate float force systems, leading to poor harvesting performance and potential damage from obstacles and uneven terrain.
Innovation Solution
A header assembly with a float cylinder, accumulator, and controllable reservoir, coupled through fluidic circuitry, which provides a float force and allows for controlled hydraulic fluid flow to manage the header's position relative to the ground, including locking and unlocking mechanisms to absorb impacts and maintain ground following.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional float force system is used, then the header can follow terrain changes, but the header cannot maintain consistent height and is susceptible to damage from obstacles
Solution Approach 1:
The system dynamically switches between two operational modes: a locked mode where the float cylinder is isolated to maintain consistent header height, and an unlocked mode where fluid can flow to the accumulator to absorb impacts from obstacles. This dynamic state change allows the system to resolve the contradiction between maintaining stability and adapting to terrain variations.
Solution Approach 2:
The system changes the hydraulic parameter state by controlling fluid flow between the float cylinder and accumulator. When the valve is closed, the float cylinder maintains constant fluid volume for stable height. When the valve is open, fluid can transfer to the accumulator to cushion obstacles, thus changing the system's response characteristics to different operating conditions.
2Productivity
If the float cylinder is locked to maintain height, then harvesting performance improves, but the system cannot absorb impacts from obstacles
Solution Approach 1:
The system prepares for potential obstacle impacts by having an unlocked mode available, where the accumulator can be charged with hydraulic fluid in advance to cushion upcoming impacts. This preliminary preparation allows the system to switch from a rigid locked state to a compliant unlocked state before encountering harmful obstacles, preventing damage while maintaining productivity during normal operation.
Solution Approach 2:
The accumulator serves as a pre-prepared cushioning element that can absorb impact energy from obstacles. By controlling the valve to allow fluid transfer to the accumulator before obstacle contact, the system establishes a protective mechanism in advance, enabling the header to withstand impacts without compromising harvesting performance during stable operation.
3Object-affected harmful factors
If the float cylinder allows fluid flow to absorb impacts, then obstacle damage is reduced, but header height consistency deteriorates
Solution Approach 1:
The system dynamically adjusts its compliance characteristics by controlling the valve state. During normal harvesting operation, the valve is closed to maintain rigid height consistency. When obstacle impact is detected or anticipated, the valve opens to allow fluid transfer to the accumulator, providing impact protection. This dynamic switching resolves the contradiction between height precision and impact absorption.
Solution Approach 2:
The system changes the hydraulic system's compliance parameter by controlling fluid flow. In the locked state, the float cylinder maintains constant volume for precise height control. In the unlocked state, fluid can transfer to the accumulator, changing the system's mechanical properties to provide impact cushioning. This parameter change allows the system to optimize for either height consistency or impact protection based on operating conditions.
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 enhances harvesting performance by maintaining consistent height and adapting to terrain changes, reducing the risk of damage from obstacles and improving crop collection efficiency.
Implementation Method 1
a first conduit forming a first fluid path that provides a 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
an accumulator
Implementation Method 3
a valve mechanism that is actuatable to inhibit fluid flow along the first fluid path between the accumulator and the float cylinder
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 movable relative to the first frame assembly, a float cylinder coupled between the first frame assembly and the second frame assembly, an accumulator, a controllable reservoir, and fluidic circuitry. The fluidic circuitry comprises a first conduit forming a first fluid path that provides a flow of pressurized fluid under pressure to the float cylinder, so the float cylinder exerts a float force on the second frame assembly, a valve mechanism that is actuatable to inhibit fluid flow along the first fluid path between the accumulator and the float cylinder, a second conduit forming a second fluid path fluidically coupled to the controllable reservoir, the controllable reservoir being controllable to add fluid to the float cylinder.