Flexible Cutter Bar Assembly Pressure Compensation
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Solution Overview
Problem
The air pressure in the pneumatic system of a harvester header can drop over time due to leakage or temperature changes, leading to a reduction in the contact force between the cutter bar assembly and the ground, which affects the harvester's efficiency and consistency during crop cutting.
Innovation Solution
An air system with air-filled biasing members and an air pressure sensor that monitors pressure, allowing a controller to adjust the mechanical connection point between the biasing members and the arms to maintain a constant upward force on the cutter bar assembly, compensating for pressure changes by shifting the force to act at a different distance from the pivot joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If air-filled biasing members are used to provide upward force on the cutter bar assembly, then the cutter bar assembly can maintain contact with the ground, but air pressure drops over time due to leakage or temperature changes, reducing the contact force
Solution Approach 1:
The system incorporates air pressure sensors that continuously monitor the pressure in the air-filled biasing members and provide feedback to the controller. When pressure drops below a threshold, the controller activates air compressors to replenish pressure, ensuring stable contact force despite leakage or temperature changes over time
Solution Approach 2:
The system uses air-filled biasing members (pneumatic springs) instead of traditional mechanical springs to provide the upward force on the cutter bar assembly. This pneumatic system allows for adjustable and maintainable contact force through air pressure control, with the understanding that pressure will naturally drop over time requiring periodic replenishment
2Force
If the connection point between the biasing member and arm is fixed, then the structure is simple, but the contact force cannot be maintained when air pressure changes
Solution Approach 1:
The connection point between the air-filled biasing member and the arm is made movable rather than fixed. The arm can rotate about a pivot joint, allowing the connection point to shift position dynamically. When air pressure changes, the altered force acts at a different distance from the pivot, automatically adjusting the moment to maintain substantially constant upward force on the cutter bar assembly
Solution Approach 2:
The system changes the spatial parameter (distance from pivot joint) of the force application point in response to air pressure changes. By allowing the connection point to move along the arm, the effective lever arm length changes, compensating for pressure variations and maintaining consistent contact force without requiring active control
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 ensures that the contact force between the cutter bar assembly and the ground remains substantially constant, maintaining efficient crop cutting and reducing the impact of air pressure fluctuations, thereby enhancing harvesting efficiency and yield.
Implementation Method 1
an air-filled biasing member configured to provide an upward force on the cutter bar assembly via the arm
Data Source
AI summary
An agricultural system includes an arm configured to rotate about a pivot joint and to support a portion of a cutter bar assembly, a fluid-filled biasing member slidingly coupled to the arm, an actuator coupled to the fluid-filled biasing member, a fluid pressure sensor configured to measure a fluid pressure in the fluid-filled biasing member, and a controller communicatively coupled to the actuator. The controller is configured to receive an input signal from the fluid pressure sensor indicative of the fluid pressure and to output an output signal to instruct the actuator to adjust a connection point between the fluid-filled biasing member and the arm based on the input signal.