Isolated Harvester Cutterbar Ground Load Sensing
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Solution Overview
Problem
Existing windrower systems face challenges in maintaining optimal floatation forces on the harvesting header, particularly with larger cutterbars, leading to stress concentrations and limited service life due to rigid connections and inadequate tolerances in welded frame structures.
Innovation Solution
A header floatation method that utilizes pivotable cutterbed modules isolated from the header framework by elastomeric isolators, along with a system of header lift arms and floatation cylinders, to adjust the positioning and pitch of the header assembly, ensuring proper floatation and ground engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connection is used to attach the cutterbed to the frame, then the structural strength is improved, but the stress concentrations increase and service life is limited
Solution Approach 1:
The patent changes the rigidity parameter of the connection between the cutterbed and frame by introducing elastomeric isolators. These isolators provide flexible mounting that allows the cutterbed to move independently, reducing stress concentrations while maintaining structural integrity. This parameter change from rigid to flexible connection directly addresses the contradiction between strength and service life.
Solution Approach 2:
The elastomeric isolators serve as intermediary elements between the cutterbed and the frame. These isolators absorb and dampen stress concentrations that would otherwise be transmitted to the frame structure. The intermediary material provides both structural support and stress reduction, extending the service life of the frame while maintaining the strength needed for operation.
2Ease of manufacture
If welded frame structures are used to attach the cutterbed, then the manufacturing efficiency is improved, but the manufacturing precision deteriorates due to inherent tolerances
Solution Approach 1:
The patent segments the connection system into separate components: the cutterbed, the elastomeric isolators, and the frame. This segmentation allows each component to be manufactured independently with standard tolerances, then assembled together. The modular approach replaces the need for precision welded connections, maintaining manufacturing efficiency while improving overall assembly precision through the flexible isolator interface.
3Productivity
If larger cutterbars are used to improve harvesting efficiency, then the productivity is improved, but the ground load transmission to the frame increases
Solution Approach 1:
The elastomeric isolators act as intermediaries that decouple the cutterbed from the frame, preventing direct transmission of ground loads. The flexible mounting allows the larger cutterbar to operate effectively while the isolators absorb and dissipate the forces generated during cutting, protecting the frame from excessive stress.
Solution Approach 2:
The patent changes the mechanical properties of the connection by using elastomeric materials with specific damping and flexibility characteristics. This parameter change allows the system to accommodate larger cutterbars and higher ground loads without transmitting excessive forces to the frame structure, maintaining both productivity and structural integrity.
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 allows for precise control of floatation forces, reducing stress on the windrower frame and extending the service life of the header assembly while maintaining efficient harvesting performance.
Implementation Method 1
isolated from the header framework with an elastomeric isolator
Implementation Method 2
A ground load is measured with a load cell positioned between the cutter bar and the header framework
Implementation Method 3
a header floatation cylinder configured to adjust the positioning of the header lift arms by causing the header lift arms to pivot about a header lift arm fulcrum
Implementation Method 4
extension of the header pitch cylinder causes the header framework to pivot about a header fulcrum to adjust the pitch of the header assembly
Data Source
AI summary
A method for determining floatation of a header assembly includes mounting rotary cutters on cutterbed modules, where each cutterbed module is pivotably attached to a header framework with a pivotable module mounting mechanism that forms a cutterbar fulcrum and isolated from the header framework with an elastomeric isolator. Header pitch is determined from a position of a header pitch cylinder. A point of ground engagement of the cutterbar is calculated a using the determined header pitch. A load is measured a with a load cell positioned between the cutter bar and the header framework. A ground force of the header assembly is calculated a using the calculated point of ground engagement for the cutterbar, a distance between the cutterbar fulcrum and the calculated point of ground engagement, and a distance between the load cell and the cutterbar fulcrum. Proper floatation of the header assembly is determined by comparing the calculated ground force to a desired force.