Magnetic Breakaway Header Height Control for Reverse Protection
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Solution Overview
Problem
Rigid header height control systems can damage the cutter bar when the harvester reverses direction due to the rigid arm digging into the ground and bending in the opposite direction, applying a bending load.
Innovation Solution
A breakaway rigid height control system with a magnetically attached rigid arm that disengages from a metal channel guide when the harvester reverses, allowing the arm to swing forward and upward, preventing damage to the cutter bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid arm is used for ground feeler in a rigid header height control system, then accurate ground contour detection is achieved, but the cutter bar is damaged when the harvester reverses direction due to bending loads
Solution Approach 1:
The rigid arm is transformed from a permanently rigid connection to a dynamically controllable connection. A breakaway mechanism with controlled breakage point allows the arm to remain rigid during forward harvesting operations for accurate ground contour detection, but can break away in a controlled manner when excessive reverse forces are detected, preventing damage to the cutter bar while maintaining the rigid structure's measurement accuracy during normal operation
Solution Approach 2:
The breakaway mechanism is designed beforehand with a controlled breakage point that acts as a safety feature. This predetermined weak point allows the rigid arm to break away before excessive forces can transmit to the cutter bar, cushioning the system against damage during reverse operations while maintaining measurement precision during forward harvesting
2Reliability
If a cable is used to attach the rigid arm to the header frame, then the arm can flex during reverse direction, but the cutting performance deteriorates due to arm flexing during forward operation
Solution Approach 1:
The connection between the rigid arm and header frame transitions from a flexible cable attachment to a dynamic breakaway mechanism. This mechanism provides rigid support during forward harvesting operations to maintain cutting performance, but allows controlled breakage during reverse operations to protect the arm, dynamically adapting the connection stiffness based on operational direction and force conditions
Solution Approach 2:
The breakaway mechanism incorporates a controlled breakage point that uses a sacrificial element designed to fail in a controlled manner. This disposable feature protects the more valuable cutter bar and arm structure by allowing a predetermined weak point to break away during reverse operations, while maintaining rigid connection during forward harvesting
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
Prevents damage to the cutter bar by allowing the rigid arm to break away and return to its working position without additional springs, maintaining effective header height control during both forward and reverse movements.
Implementation Method 1
a magnet embedded within the rigid arm adjacent the upper end. The magnet is configured to keep a back surface of the upper end of the rigid arm attached to the metal channel guide via a magnetic force
Implementation Method 2
when the agricultural harvester travels in a reverse direction causing a force exerted by the ground surface on the rigid arm to exceed the magnetic force, to allow a release of the back surface of the rigid arm from the metal channel guide
Data Source
AI summary
A rigid height control system configured to be coupled to a header includes a rigid arm pivotally coupled to a shaft. The rigid arm includes an upper end and a lower end, wherein the lower end is configured to engage a ground surface. The rigid height control system includes a metal channel guide coupled to the shaft and a magnet embedded within the rigid arm adjacent the upper end. The magnet is configured to keep the rigid arm attached to the metal channel guide via a magnetic force so that the lower end engages the ground surface when the agricultural harvester travels in a forward direction. The magnet is configured, when the agricultural harvester travels in a reverse direction causing a force exerted by the ground surface on the rigid arm to exceed the magnetic force, to allow a release of the rigid arm from the metal channel guide.