Pivotable Rasp Bar Configuration for Harvester Rotor Traction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current agricultural threshing and separation systems in self-propelled harvesters face challenges in adjusting traction force on crops due to varying crop conditions and densities, leading to inefficient power consumption and interaction with rasp bars.
Innovation Solution
The implementation of a rotor with pivotable rasp bars featuring a movable secondary crop engaging portion that adjusts its position relative to the primary portion, allowing for self-regulating or actively controlled crop engagement based on crop density and conditions, thereby optimizing traction and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed rasp bars are used in the downstream separation section, then the device complexity is low, but the adaptability to varying crop density and conditions is insufficient
Solution Approach 1:
The rasp bar is designed with a movable secondary crop engaging portion that can dynamically adjust its position relative to the rotor surface. This movable portion pivots about an axis, allowing it to extend radially outward when crop density is high (activating the feature) and retract when crop density is low (deactivating the feature). This dynamic adjustment enables the device to adapt to varying crop conditions without requiring complex control systems, resolving the contradiction between adaptability and device complexity.
2Force
If aggressive rasp bar impact is applied to densely packed crops, then the traction force on crops is sufficient, but the power consumption increases excessively
Solution Approach 1:
The invention changes the physical state and position of the secondary crop engaging portion based on operational conditions. When crops are densely packed, the movable portion extends radially outward to provide aggressive impact and high traction force. When crop density is low, the movable portion retracts to reduce impact and lower power consumption. This parameter change allows the system to optimize the balance between traction force and power consumption dynamically during operation.
3Force
If the secondary crop engaging portion is always extended radially outward, then the traction force on densely packed crops is maximized, but the power consumption increases unnecessarily during normal operation
Solution Approach 1:
The movable secondary crop engaging portion is designed to be self-regulating, automatically adjusting its position in response to crop density conditions without external control. When crops are densely packed, the natural resistance pushes the movable portion outward to activate the secondary engaging feature. When crops are less dense, the movable portion naturally retracts to deactivate the feature, reducing energy consumption. This self-service mechanism eliminates the need for sensors, actuators, or control systems while optimizing the balance between traction force and power consumption.
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 enables dynamic adjustment of crop engagement characteristics, enhancing the efficiency of threshing and separation processes by optimizing traction force according to crop conditions, reducing power consumption, and improving the handling of densely packed crop layers.
Implementation Method 1
a pivotable rasp bar body positioned in a first position
Data Source
AI summary
A rotor for an agricultural implement such as a self-propelled harvester. The rotor includes a surface and one or more rasp bars which comprise a crop engaging portion that is immobile relative to the surface and a crop engaging portion that is movable relative to the surface, in that a distance between at least part of the movable portion and the surface of the rotor is variable. One of the crop engaging portions is a primary portion configured to engage with crop regardless of whether it is movable or not, while the other is a secondary portion that comprises a crop engaging feature such as a tooth for increasing traction on the crop. The crop engaging feature is activated, by either extending radially outwardly from the primary portion, or deactivated by lying at a same radial position or radially inwardly of the primary portion.