Elongate Sickle Knife Energy Accumulation for Header Force Reduction
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Solution Overview
Problem
Existing agricultural headers experience high forces on structural components due to the acceleration and deceleration of elongate sickle knives, which can lead to stress and potential damage.
Innovation Solution
The implementation of accumulator means, such as spring elements or magnetic systems, between the header frame and the elongate sickle knife to accumulate energy during deceleration and release it during acceleration, reducing the forces exerted on structural components by transforming kinetic energy into potential energy and vice versa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the elongate sickle knife is reciprocally moved at high speed to increase cutting productivity, then the cutting efficiency is improved, but the forces on structural components increase due to high acceleration and deceleration
Solution Approach 1:
The patent applies the dynamics principle by introducing accumulator means that dynamically adjust the energy distribution during the reciprocating motion of the sickle knife. The accumulators absorb excess energy during deceleration phases and release it during acceleration phases, creating a dynamically balanced system that maintains high cutting speed while reducing peak forces on structural components.
Solution Approach 2:
The patent implements parameter changes by modifying the energy parameters of the sickle knife motion through the accumulator means. By changing the kinetic energy profile during acceleration and deceleration phases, the system achieves high cutting productivity without proportionally increasing the mechanical forces on structural components, effectively decoupling these two parameters.
2Speed
If the elongate sickle knife is accelerated and decelerated rapidly to maintain high cutting speed, then the productivity is improved, but the stress on the connection point between the sickle knife and actuator increases
Solution Approach 1:
The patent applies beforehand cushioning by positioning accumulator means along the length of the sickle knife that are pre-configured to absorb shock and reduce stress during acceleration and deceleration cycles. These accumulators act as cushioning elements that mitigate the stress transmitted to the connection point between the sickle knife and actuator, allowing high cutting speeds to be maintained without proportionally increasing connection point stress.
3Length of moving object
If the sickle knife is made longer to cover the entire header width, then the cutting coverage is improved, but the mass increases leading to higher forces during reciprocating motion
Solution Approach 1:
The patent applies segmentation by dividing the elongate sickle knife into multiple sections with accumulator means distributed along its length. This segmentation allows the long sickle knife to maintain cutting coverage across the entire header width while the distributed accumulators reduce the effective mass that must be accelerated and decelerated as a single unit, thereby reducing the forces required for reciprocating motion.
Solution Approach 2:
The patent implements dynamics by introducing accumulator means that enable the long sickle knife to move reciprocally with reduced forces. The accumulators dynamically manage the kinetic energy of the extended sickle knife, allowing it to achieve full header width coverage while maintaining force levels comparable to shorter knives by efficiently managing the energy required for acceleration and deceleration.
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 significantly reduces the forces on structural components, particularly at the connection point between the sickle knife and the actuator, enhancing the reliability and efficiency of the header's operation by distributing the impact of acceleration and deceleration across the length of the sickle knife.
Implementation Method 1
accumulator means extend between the header frame and the elongate sickle knife to accumulate energy during a first movement of the elongate sickle knife from the intermediate position towards at least one of the first position and the second position, and to release accumulated energy during a second movement of said elongate sickle knife opposite to said first movement
Data Source
AI summary
A header for an agricultural vehicle. The header includes a header frame and an elongate sickle knife mounted along a leading edge of the header. The header further includes an actuator for reciprocally moving the elongate sickle knife in its longitudinal direction relative to the header frame between a first position and a second position over an intermediate position. At least one accumulator extends between the header frame and the elongate sickle knife to accumulate energy during a first movement of the elongate sickle knife from the intermediate position towards at least one of the first position and the second position, and to release accumulated energy during a second movement of the elongate sickle knife opposite to the first movement.