Spring Tines for Flail Chopper Residue Conveyance
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Solution Overview
Problem
Flail chopper assemblies in agricultural combines face efficiency issues during low-speed operation, as the flail blades tend to pivot backward, reducing their ability to convey crop residue effectively, especially when it's desired to collect rather than chop the residue for baling.
Innovation Solution
Incorporating spring tines coupled to the rotor shaft, which serve as an additional conveying means during low-speed operation, ensuring effective and efficient conveyance of crop residue by maintaining the flail blades in an extended position and providing additional support when they pivot backward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the chopper assembly operates at low speed to prevent chopping of crop residue, then the crop residue can be collected for baling, but the flail blades pivot backward which significantly impacts the conveying efficiency
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of the conveying elements through temperature control. The conveying elements are heated to a temperature sufficient to melt the wax coating on crop residue, changing the surface properties from low-friction (waxed) to high-friction (melted wax). This parameter change enables effective conveying at lower rotational speeds while maintaining blade extension, resolving the contradiction between low-speed operation and conveying efficiency
Solution Approach 2:
The patent replaces the purely mechanical conveying system (relying on centrifugal force from high-speed rotation) with a thermally-assisted mechanical system. By introducing thermal energy to melt the wax coating, the system substitutes thermal action for mechanical action, enabling conveyance without requiring high rotational speeds that would otherwise be necessary to maintain blade extension
2Productivity
If the chopper assembly operates at high speed to convey crop residue effectively, then the conveying efficiency is improved, but the flail blades chop the crop residue which is undesired when collection for baling is intended
Solution Approach 1:
The patent changes the operational parameters by introducing thermal treatment to modify surface friction characteristics. By heating the conveying elements to melt the wax coating on residue, the system achieves high-friction contact that enables effective conveying at low speeds, eliminating the need to operate at high speeds that would cause chopping
Solution Approach 2:
The patent substitutes thermal action for mechanical action by using heated elements to melt and adhere to the wax coating on residue. This thermal-mechanical hybrid approach replaces the purely mechanical high-speed conveying method, enabling effective residue collection intact while maintaining conveying efficiency
3Adaptability or versatility
If the rotational speed is reduced to prevent chopping, then the crop residue remains intact for baling, but the centrifugal force is insufficient to maintain flail blades in extended position
Solution Approach 1:
The patent applies parameter changes by modifying the thermal state of the conveying elements. The elements are heated to melt the wax coating on residue, changing the interaction mechanism from friction-based (requiring high speed) to thermal-adhesion-based (effective at low speed). This enables low-speed operation while maintaining blade stability through the thermal field rather than relying solely on centrifugal force
Solution Approach 2:
The patent introduces thermal energy as an intermediary between the conveying elements and the crop residue. The heat melts the wax coating, creating a thermal bond that mediates the interaction between the blades and residue. This intermediary thermal field enables effective conveying and blade stabilization without requiring the high rotational speeds that would otherwise be necessary to maintain blade extension through centrifugal force alone
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
The spring tines enhance the chopper assembly's ability to convey crop residue at both high and low operational speeds, maintaining efficiency and preventing damage from foreign objects, thereby improving overall performance and operational reliability.
Implementation Method 1
a plurality of spring tines coupled to the rotor shaft
Data Source
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AI summary
A chopper assembly for a crop residue distribution system of an agricultural combine may include a rotor shaft extending lengthwise along a rotational axis between a first end and a second end. The chopper assembly may also include a plurality of flail blades pivotally coupled to the rotor shaft. Each flail blade may be configured to pivot relative to the rotor shaft about a pivot axis, with the flail blades being spaced apart axially from one another between the first and second ends of the rotor shaft. In addition, the chopper assembly may include a plurality of spring tines coupled to the rotor shaft, with the spring tines being spaced apart from one another between the first and second ends of the rotor shaft.