Header Float Cylinder Geometry for Smoother Float Pressure
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Solution Overview
Problem
Agricultural harvesters face challenges in maintaining consistent float pressure on their headers, leading to variable harvesting performance due to float force variations with changes in ground position, resulting in either cutter bar digging into the ground or missed crop.
Innovation Solution
A float assembly is configured such that its mechanical advantage increases as the pressure applied by the float mechanism decreases, and vice versa, maintaining a relatively consistent float force across varying positions of the main frame relative to the attachment frame, using a float cylinder and accumulator with a specific orientation to achieve this inverse relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the float force is set too low, then the header will respond to the ground more slowly, but if the float force is set too high, then the header will not fall fast enough to follow the ground
Solution Approach 1:
The float cylinder is oriented at an angle rather than vertically, creating a dynamic mechanical advantage that changes with the header position. As the main frame moves relative to the attachment frame, the angle of the cylinder changes, automatically adjusting the float force to optimize both response speed and ground following accuracy.
Solution Approach 2:
The system changes the mechanical advantage parameter of the float cylinder by varying its orientation angle. This parameter change allows the float force to be dynamically adjusted based on the position of the main frame, resolving the contradiction between response speed and ground following precision.
2Reliability
If the float force is increased to improve ground following, then the header responds faster to ground changes, but the float force varies significantly with position changes
Solution Approach 1:
The angled orientation of the float cylinder creates a dynamic mechanical advantage that compensates for position changes. As the main frame moves up or down, the changing angle automatically adjusts the force transmission, maintaining consistent float force application despite position variations.
Solution Approach 2:
The mechanical advantage variation acts as a counterbalancing mechanism that offsets the natural force variations caused by position changes, stabilizing the effective float force applied to the header throughout the range of motion.
3Device complexity
If the float cylinder is oriented vertically to simplify the mechanism, then the structure is simpler, but the mechanical advantage varies with position causing inconsistent float force
Solution Approach 1:
Instead of changing the physical structure or adding complex mechanisms, the solution changes the orientation angle parameter of the existing cylinder. This simple parameter change creates the necessary mechanical advantage variation to maintain consistent float force without increasing device complexity.
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 configuration ensures a more consistent float force, improving ground following performance and harvesting efficiency by minimizing variations in float force, thus preventing cutter bar engagement with the soil and ensuring better crop collection.
Implementation Method 1
A float cylinder and accumulator are coupled between a header main frame and an attachment frame. The float cylinder is orientated so that its mechanical advantage in applying a float force to the header varies with the position of the main frame relative to the attachment frame.
Implementation Method 2
A float cylinder and accumulator are coupled between a header main frame and an attachment frame
Data Source
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AI summary
A float cylinder and accumulator are coupled between a header main frame and an attachment frame. The float cylinder is orientated so that its mechanical advantage in applying a float force to the header varies with the position of the main frame relative to the attachment frame. Similarly, the pressure exerted by the cylinder varies inversely with its mechanical advantage.